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APItest/t/utf8_warn_base.pl: Generate smaller overlongs
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1/* utf8.c
2 *
1129b882 3 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
b94e2f88 4 * by Larry Wall and others
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5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
4ac71550
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12 * 'What a fix!' said Sam. 'That's the one place in all the lands we've ever
13 * heard of that we don't want to see any closer; and that's the one place
14 * we're trying to get to! And that's just where we can't get, nohow.'
15 *
cdad3b53 16 * [p.603 of _The Lord of the Rings_, IV/I: "The Taming of Sméagol"]
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17 *
18 * 'Well do I understand your speech,' he answered in the same language;
19 * 'yet few strangers do so. Why then do you not speak in the Common Tongue,
4ac71550 20 * as is the custom in the West, if you wish to be answered?'
cdad3b53 21 * --Gandalf, addressing Théoden's door wardens
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22 *
23 * [p.508 of _The Lord of the Rings_, III/vi: "The King of the Golden Hall"]
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24 *
25 * ...the travellers perceived that the floor was paved with stones of many
26 * hues; branching runes and strange devices intertwined beneath their feet.
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27 *
28 * [p.512 of _The Lord of the Rings_, III/vi: "The King of the Golden Hall"]
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29 */
30
31#include "EXTERN.h"
864dbfa3 32#define PERL_IN_UTF8_C
a0ed51b3 33#include "perl.h"
b992490d 34#include "invlist_inline.h"
a0ed51b3 35
806547a7 36static const char malformed_text[] = "Malformed UTF-8 character";
27da23d5 37static const char unees[] =
806547a7 38 "Malformed UTF-8 character (unexpected end of string)";
760c7c2f 39static const char cp_above_legal_max[] =
76513bdc 40 "Use of code point 0x%" UVXf " is deprecated; the permissible max is 0x%" UVXf ". This will be fatal in Perl 5.28";
760c7c2f 41
114d9c4d 42#define MAX_NON_DEPRECATED_CP ((UV) (IV_MAX))
901b21bf 43
48ef279e 44/*
ccfc67b7 45=head1 Unicode Support
7fefc6c1 46These are various utility functions for manipulating UTF8-encoded
72d33970 47strings. For the uninitiated, this is a method of representing arbitrary
61296642 48Unicode characters as a variable number of bytes, in such a way that
56da48f7
DM
49characters in the ASCII range are unmodified, and a zero byte never appears
50within non-zero characters.
166f8a29 51
eaf7a4d2
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52=cut
53*/
54
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55void
56Perl__force_out_malformed_utf8_message(pTHX_
57 const U8 *const p, /* First byte in UTF-8 sequence */
58 const U8 * const e, /* Final byte in sequence (may include
59 multiple chars */
60 const U32 flags, /* Flags to pass to utf8n_to_uvchr(),
61 usually 0, or some DISALLOW flags */
62 const bool die_here) /* If TRUE, this function does not return */
63{
64 /* This core-only function is to be called when a malformed UTF-8 character
65 * is found, in order to output the detailed information about the
66 * malformation before dieing. The reason it exists is for the occasions
67 * when such a malformation is fatal, but warnings might be turned off, so
68 * that normally they would not be actually output. This ensures that they
69 * do get output. Because a sequence may be malformed in more than one
70 * way, multiple messages may be generated, so we can't make them fatal, as
71 * that would cause the first one to die.
72 *
73 * Instead we pretend -W was passed to perl, then die afterwards. The
74 * flexibility is here to return to the caller so they can finish up and
75 * die themselves */
76 U32 errors;
77
78 PERL_ARGS_ASSERT__FORCE_OUT_MALFORMED_UTF8_MESSAGE;
79
80 ENTER;
c15a80f3 81 SAVEI8(PL_dowarn);
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82 SAVESPTR(PL_curcop);
83
84 PL_dowarn = G_WARN_ALL_ON|G_WARN_ON;
85 if (PL_curcop) {
86 PL_curcop->cop_warnings = pWARN_ALL;
87 }
88
89 (void) utf8n_to_uvchr_error(p, e - p, NULL, flags & ~UTF8_CHECK_ONLY, &errors);
90
91 LEAVE;
92
93 if (! errors) {
94 Perl_croak(aTHX_ "panic: _force_out_malformed_utf8_message should"
95 " be called only when there are errors found");
96 }
97
98 if (die_here) {
99 Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)");
100 }
101}
102
eaf7a4d2 103/*
378516de 104=for apidoc uvoffuni_to_utf8_flags
eebe1485 105
a27992cc 106THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
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107Instead, B<Almost all code should use L</uvchr_to_utf8> or
108L</uvchr_to_utf8_flags>>.
a27992cc 109
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110This function is like them, but the input is a strict Unicode
111(as opposed to native) code point. Only in very rare circumstances should code
112not be using the native code point.
949cf498 113
efa9cd84 114For details, see the description for L</uvchr_to_utf8_flags>.
949cf498 115
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116=cut
117*/
118
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119/* All these formats take a single UV code point argument */
120const char surrogate_cp_format[] = "UTF-16 surrogate U+%04" UVXf;
121const char nonchar_cp_format[] = "Unicode non-character U+%04" UVXf
122 " is not recommended for open interchange";
123const char super_cp_format[] = "Code point 0x%" UVXf " is not Unicode,"
124 " may not be portable";
125const char above_31_bit_cp_format[] = "Code point 0x%" UVXf " is not"
126 " Unicode, and not portable";
127
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128#define HANDLE_UNICODE_SURROGATE(uv, flags) \
129 STMT_START { \
130 if (flags & UNICODE_WARN_SURROGATE) { \
131 Perl_ck_warner_d(aTHX_ packWARN(WARN_SURROGATE), \
c94c2f39 132 surrogate_cp_format, uv); \
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133 } \
134 if (flags & UNICODE_DISALLOW_SURROGATE) { \
135 return NULL; \
136 } \
137 } STMT_END;
138
139#define HANDLE_UNICODE_NONCHAR(uv, flags) \
140 STMT_START { \
141 if (flags & UNICODE_WARN_NONCHAR) { \
142 Perl_ck_warner_d(aTHX_ packWARN(WARN_NONCHAR), \
c94c2f39 143 nonchar_cp_format, uv); \
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144 } \
145 if (flags & UNICODE_DISALLOW_NONCHAR) { \
146 return NULL; \
147 } \
148 } STMT_END;
149
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150/* Use shorter names internally in this file */
151#define SHIFT UTF_ACCUMULATION_SHIFT
152#undef MARK
153#define MARK UTF_CONTINUATION_MARK
154#define MASK UTF_CONTINUATION_MASK
155
dfe13c55 156U8 *
4b31b634 157Perl_uvoffuni_to_utf8_flags(pTHX_ U8 *d, UV uv, const UV flags)
a0ed51b3 158{
378516de 159 PERL_ARGS_ASSERT_UVOFFUNI_TO_UTF8_FLAGS;
7918f24d 160
2d1545e5 161 if (OFFUNI_IS_INVARIANT(uv)) {
4c8cd605 162 *d++ = LATIN1_TO_NATIVE(uv);
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163 return d;
164 }
facc1dc2 165
3ea68d71 166 if (uv <= MAX_UTF8_TWO_BYTE) {
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167 *d++ = I8_TO_NATIVE_UTF8(( uv >> SHIFT) | UTF_START_MARK(2));
168 *d++ = I8_TO_NATIVE_UTF8(( uv & MASK) | MARK);
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169 return d;
170 }
d9432125 171
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172 /* Not 2-byte; test for and handle 3-byte result. In the test immediately
173 * below, the 16 is for start bytes E0-EF (which are all the possible ones
174 * for 3 byte characters). The 2 is for 2 continuation bytes; these each
175 * contribute SHIFT bits. This yields 0x4000 on EBCDIC platforms, 0x1_0000
176 * on ASCII; so 3 bytes covers the range 0x400-0x3FFF on EBCDIC;
177 * 0x800-0xFFFF on ASCII */
178 if (uv < (16 * (1U << (2 * SHIFT)))) {
179 *d++ = I8_TO_NATIVE_UTF8(( uv >> ((3 - 1) * SHIFT)) | UTF_START_MARK(3));
180 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((2 - 1) * SHIFT)) & MASK) | MARK);
181 *d++ = I8_TO_NATIVE_UTF8(( uv /* (1 - 1) */ & MASK) | MARK);
182
183#ifndef EBCDIC /* These problematic code points are 4 bytes on EBCDIC, so
184 aren't tested here */
185 /* The most likely code points in this range are below the surrogates.
186 * Do an extra test to quickly exclude those. */
187 if (UNLIKELY(uv >= UNICODE_SURROGATE_FIRST)) {
188 if (UNLIKELY( UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv)
189 || UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)))
190 {
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191 HANDLE_UNICODE_NONCHAR(uv, flags);
192 }
193 else if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
194 HANDLE_UNICODE_SURROGATE(uv, flags);
760c7c2f 195 }
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196 }
197#endif
198 return d;
199 }
200
201 /* Not 3-byte; that means the code point is at least 0x1_0000 on ASCII
202 * platforms, and 0x4000 on EBCDIC. There are problematic cases that can
203 * happen starting with 4-byte characters on ASCII platforms. We unify the
204 * code for these with EBCDIC, even though some of them require 5-bytes on
205 * those, because khw believes the code saving is worth the very slight
206 * performance hit on these high EBCDIC code points. */
207
208 if (UNLIKELY(UNICODE_IS_SUPER(uv))) {
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209 if ( UNLIKELY(uv > MAX_NON_DEPRECATED_CP)
210 && ckWARN_d(WARN_DEPRECATED))
211 {
212 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
213 cp_above_legal_max, uv, MAX_NON_DEPRECATED_CP);
a5bf80e0 214 }
56576a04 215 if ( (flags & UNICODE_WARN_SUPER)
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216 || ( UNICODE_IS_ABOVE_31_BIT(uv)
217 && (flags & UNICODE_WARN_ABOVE_31_BIT)))
218 {
219 Perl_ck_warner_d(aTHX_ packWARN(WARN_NON_UNICODE),
220
221 /* Choose the more dire applicable warning */
222 (UNICODE_IS_ABOVE_31_BIT(uv))
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223 ? above_31_bit_cp_format
224 : super_cp_format,
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225 uv);
226 }
56576a04 227 if ( (flags & UNICODE_DISALLOW_SUPER)
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228 || ( UNICODE_IS_ABOVE_31_BIT(uv)
229 && (flags & UNICODE_DISALLOW_ABOVE_31_BIT)))
230 {
231 return NULL;
232 }
233 }
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234 else if (UNLIKELY(UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv))) {
235 HANDLE_UNICODE_NONCHAR(uv, flags);
507b9800 236 }
d9432125 237
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238 /* Test for and handle 4-byte result. In the test immediately below, the
239 * 8 is for start bytes F0-F7 (which are all the possible ones for 4 byte
240 * characters). The 3 is for 3 continuation bytes; these each contribute
241 * SHIFT bits. This yields 0x4_0000 on EBCDIC platforms, 0x20_0000 on
242 * ASCII, so 4 bytes covers the range 0x4000-0x3_FFFF on EBCDIC;
243 * 0x1_0000-0x1F_FFFF on ASCII */
244 if (uv < (8 * (1U << (3 * SHIFT)))) {
245 *d++ = I8_TO_NATIVE_UTF8(( uv >> ((4 - 1) * SHIFT)) | UTF_START_MARK(4));
246 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((3 - 1) * SHIFT)) & MASK) | MARK);
247 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((2 - 1) * SHIFT)) & MASK) | MARK);
248 *d++ = I8_TO_NATIVE_UTF8(( uv /* (1 - 1) */ & MASK) | MARK);
249
250#ifdef EBCDIC /* These were handled on ASCII platforms in the code for 3-byte
251 characters. The end-plane non-characters for EBCDIC were
252 handled just above */
253 if (UNLIKELY(UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv))) {
254 HANDLE_UNICODE_NONCHAR(uv, flags);
d528804a 255 }
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256 else if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
257 HANDLE_UNICODE_SURROGATE(uv, flags);
258 }
259#endif
260
261 return d;
262 }
263
264 /* Not 4-byte; that means the code point is at least 0x20_0000 on ASCII
265 * platforms, and 0x4000 on EBCDIC. At this point we switch to a loop
266 * format. The unrolled version above turns out to not save all that much
267 * time, and at these high code points (well above the legal Unicode range
268 * on ASCII platforms, and well above anything in common use in EBCDIC),
269 * khw believes that less code outweighs slight performance gains. */
270
d9432125 271 {
5aaebcb3 272 STRLEN len = OFFUNISKIP(uv);
1d72bdf6
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273 U8 *p = d+len-1;
274 while (p > d) {
4c8cd605 275 *p-- = I8_TO_NATIVE_UTF8((uv & UTF_CONTINUATION_MASK) | UTF_CONTINUATION_MARK);
1d72bdf6
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276 uv >>= UTF_ACCUMULATION_SHIFT;
277 }
4c8cd605 278 *p = I8_TO_NATIVE_UTF8((uv & UTF_START_MASK(len)) | UTF_START_MARK(len));
1d72bdf6
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279 return d+len;
280 }
a0ed51b3 281}
a5bf80e0 282
646ca15d 283/*
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284=for apidoc uvchr_to_utf8
285
bcb1a2d4 286Adds the UTF-8 representation of the native code point C<uv> to the end
f2fc1b45 287of the string C<d>; C<d> should have at least C<UVCHR_SKIP(uv)+1> (up to
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288C<UTF8_MAXBYTES+1>) free bytes available. The return value is the pointer to
289the byte after the end of the new character. In other words,
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290
291 d = uvchr_to_utf8(d, uv);
292
293is the recommended wide native character-aware way of saying
294
295 *(d++) = uv;
296
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297This function accepts any UV as input, but very high code points (above
298C<IV_MAX> on the platform) will raise a deprecation warning. This is
299typically 0x7FFF_FFFF in a 32-bit word.
300
301It is possible to forbid or warn on non-Unicode code points, or those that may
302be problematic by using L</uvchr_to_utf8_flags>.
de69f3af 303
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304=cut
305*/
306
de69f3af
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307/* This is also a macro */
308PERL_CALLCONV U8* Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv);
309
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310U8 *
311Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv)
312{
de69f3af 313 return uvchr_to_utf8(d, uv);
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314}
315
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316/*
317=for apidoc uvchr_to_utf8_flags
318
319Adds the UTF-8 representation of the native code point C<uv> to the end
f2fc1b45 320of the string C<d>; C<d> should have at least C<UVCHR_SKIP(uv)+1> (up to
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321C<UTF8_MAXBYTES+1>) free bytes available. The return value is the pointer to
322the byte after the end of the new character. In other words,
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323
324 d = uvchr_to_utf8_flags(d, uv, flags);
325
326or, in most cases,
327
328 d = uvchr_to_utf8_flags(d, uv, 0);
329
330This is the Unicode-aware way of saying
331
332 *(d++) = uv;
333
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334If C<flags> is 0, this function accepts any UV as input, but very high code
335points (above C<IV_MAX> for the platform) will raise a deprecation warning.
336This is typically 0x7FFF_FFFF in a 32-bit word.
337
338Specifying C<flags> can further restrict what is allowed and not warned on, as
339follows:
de69f3af 340
796b6530 341If C<uv> is a Unicode surrogate code point and C<UNICODE_WARN_SURROGATE> is set,
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342the function will raise a warning, provided UTF8 warnings are enabled. If
343instead C<UNICODE_DISALLOW_SURROGATE> is set, the function will fail and return
344NULL. If both flags are set, the function will both warn and return NULL.
de69f3af 345
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346Similarly, the C<UNICODE_WARN_NONCHAR> and C<UNICODE_DISALLOW_NONCHAR> flags
347affect how the function handles a Unicode non-character.
93e6dbd6 348
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349And likewise, the C<UNICODE_WARN_SUPER> and C<UNICODE_DISALLOW_SUPER> flags
350affect the handling of code points that are above the Unicode maximum of
3510x10FFFF. Languages other than Perl may not be able to accept files that
352contain these.
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353
354The flag C<UNICODE_WARN_ILLEGAL_INTERCHANGE> selects all three of
355the above WARN flags; and C<UNICODE_DISALLOW_ILLEGAL_INTERCHANGE> selects all
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356three DISALLOW flags. C<UNICODE_DISALLOW_ILLEGAL_INTERCHANGE> restricts the
357allowed inputs to the strict UTF-8 traditionally defined by Unicode.
358Similarly, C<UNICODE_WARN_ILLEGAL_C9_INTERCHANGE> and
359C<UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE> are shortcuts to select the
360above-Unicode and surrogate flags, but not the non-character ones, as
361defined in
362L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>.
363See L<perlunicode/Noncharacter code points>.
93e6dbd6 364
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365Code points above 0x7FFF_FFFF (2**31 - 1) were never specified in any standard,
366so using them is more problematic than other above-Unicode code points. Perl
367invented an extension to UTF-8 to represent the ones above 2**36-1, so it is
368likely that non-Perl languages will not be able to read files that contain
369these that written by the perl interpreter; nor would Perl understand files
370written by something that uses a different extension. For these reasons, there
371is a separate set of flags that can warn and/or disallow these extremely high
372code points, even if other above-Unicode ones are accepted. These are the
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373C<UNICODE_WARN_ABOVE_31_BIT> and C<UNICODE_DISALLOW_ABOVE_31_BIT> flags. These
374are entirely independent from the deprecation warning for code points above
375C<IV_MAX>. On 32-bit machines, it will eventually be forbidden to have any
376code point that needs more than 31 bits to represent. When that happens,
377effectively the C<UNICODE_DISALLOW_ABOVE_31_BIT> flag will always be set on
37832-bit machines. (Of course C<UNICODE_DISALLOW_SUPER> will treat all
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379above-Unicode code points, including these, as malformations; and
380C<UNICODE_WARN_SUPER> warns on these.)
381
382On EBCDIC platforms starting in Perl v5.24, the Perl extension for representing
383extremely high code points kicks in at 0x3FFF_FFFF (2**30 -1), which is lower
384than on ASCII. Prior to that, code points 2**31 and higher were simply
385unrepresentable, and a different, incompatible method was used to represent
386code points between 2**30 and 2**31 - 1. The flags C<UNICODE_WARN_ABOVE_31_BIT>
387and C<UNICODE_DISALLOW_ABOVE_31_BIT> have the same function as on ASCII
388platforms, warning and disallowing 2**31 and higher.
de69f3af 389
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390=cut
391*/
392
393/* This is also a macro */
394PERL_CALLCONV U8* Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags);
395
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396U8 *
397Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags)
398{
de69f3af 399 return uvchr_to_utf8_flags(d, uv, flags);
07693fe6
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400}
401
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402PERL_STATIC_INLINE bool
403S_is_utf8_cp_above_31_bits(const U8 * const s, const U8 * const e)
404{
405 /* Returns TRUE if the first code point represented by the Perl-extended-
406 * UTF-8-encoded string starting at 's', and looking no further than 'e -
407 * 1' doesn't fit into 31 bytes. That is, that if it is >= 2**31.
408 *
409 * The function handles the case where the input bytes do not include all
410 * the ones necessary to represent a full character. That is, they may be
411 * the intial bytes of the representation of a code point, but possibly
412 * the final ones necessary for the complete representation may be beyond
413 * 'e - 1'.
414 *
415 * The function assumes that the sequence is well-formed UTF-8 as far as it
416 * goes, and is for a UTF-8 variant code point. If the sequence is
417 * incomplete, the function returns FALSE if there is any well-formed
418 * UTF-8 byte sequence that can complete it in such a way that a code point
419 * < 2**31 is produced; otherwise it returns TRUE.
420 *
421 * Getting this exactly right is slightly tricky, and has to be done in
422 * several places in this file, so is centralized here. It is based on the
423 * following table:
424 *
425 * U+7FFFFFFF (2 ** 31 - 1)
426 * ASCII: \xFD\xBF\xBF\xBF\xBF\xBF
427 * IBM-1047: \xFE\x41\x41\x41\x41\x41\x41\x42\x73\x73\x73\x73\x73\x73
428 * IBM-037: \xFE\x41\x41\x41\x41\x41\x41\x42\x72\x72\x72\x72\x72\x72
429 * POSIX-BC: \xFE\x41\x41\x41\x41\x41\x41\x42\x75\x75\x75\x75\x75\x75
430 * I8: \xFF\xA0\xA0\xA0\xA0\xA0\xA0\xA1\xBF\xBF\xBF\xBF\xBF\xBF
431 * U+80000000 (2 ** 31):
432 * ASCII: \xFE\x82\x80\x80\x80\x80\x80
433 * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] 10 11 12 13
434 * IBM-1047: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
435 * IBM-037: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
436 * POSIX-BC: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
437 * I8: \xFF\xA0\xA0\xA0\xA0\xA0\xA0\xA2\xA0\xA0\xA0\xA0\xA0\xA0
438 */
439
440#ifdef EBCDIC
441
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442 /* [0] is start byte [1] [2] [3] [4] [5] [6] [7] */
443 const U8 prefix[] = "\x41\x41\x41\x41\x41\x41\x42";
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444 const STRLEN prefix_len = sizeof(prefix) - 1;
445 const STRLEN len = e - s;
f880f78a 446 const STRLEN cmp_len = MIN(prefix_len, len - 1);
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447
448#else
449
450 PERL_UNUSED_ARG(e);
451
452#endif
453
454 PERL_ARGS_ASSERT_IS_UTF8_CP_ABOVE_31_BITS;
455
456 assert(! UTF8_IS_INVARIANT(*s));
457
458#ifndef EBCDIC
459
460 /* Technically, a start byte of FE can be for a code point that fits into
461 * 31 bytes, but not for well-formed UTF-8: doing that requires an overlong
462 * malformation. */
463 return (*s >= 0xFE);
464
465#else
466
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467 /* On the EBCDIC code pages we handle, only the native start byte 0xFE can
468 * mean a 32-bit or larger code point (0xFF is an invariant). For 0xFE, we
469 * need at least 2 bytes, and maybe up through 8 bytes, to be sure that the
470 * value is above 31 bits. */
83dc0f42
KW
471 if (*s != 0xFE || len == 1) {
472 return FALSE;
473 }
474
475 /* Note that in UTF-EBCDIC, the two lowest possible continuation bytes are
476 * \x41 and \x42. */
477 return cBOOL(memGT(s + 1, prefix, cmp_len));
478
479#endif
480
481}
482
c179379d
KW
483/* Anything larger than this will overflow the word if it were converted into a UV */
484#if defined(UV_IS_QUAD)
485# ifdef EBCDIC /* Actually is I8 */
486# define HIGHEST_REPRESENTABLE_UTF8 \
487 "\xFF\xAF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF"
488# else
489# define HIGHEST_REPRESENTABLE_UTF8 \
490 "\xFF\x80\x8F\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF"
491# endif
492#else /* 32-bit */
493# ifdef EBCDIC
494# define HIGHEST_REPRESENTABLE_UTF8 \
495 "\xFF\xA0\xA0\xA0\xA0\xA0\xA0\xA3\xBF\xBF\xBF\xBF\xBF\xBF"
496# else
497# define HIGHEST_REPRESENTABLE_UTF8 "\xFE\x83\xBF\xBF\xBF\xBF\xBF"
498# endif
499#endif
500
12a4bed3
KW
501PERL_STATIC_INLINE bool
502S_does_utf8_overflow(const U8 * const s, const U8 * e)
503{
504 const U8 *x;
505 const U8 * y = (const U8 *) HIGHEST_REPRESENTABLE_UTF8;
506
c551bb01
KW
507#if ! defined(UV_IS_QUAD) && ! defined(EBCDIC)
508
509 const STRLEN len = e - s;
510
511#endif
512
12a4bed3
KW
513 /* Returns a boolean as to if this UTF-8 string would overflow a UV on this
514 * platform, that is if it represents a code point larger than the highest
515 * representable code point. (For ASCII platforms, we could use memcmp()
516 * because we don't have to convert each byte to I8, but it's very rare
517 * input indeed that would approach overflow, so the loop below will likely
518 * only get executed once.
519 *
520 * 'e' must not be beyond a full character. If it is less than a full
521 * character, the function returns FALSE if there is any input beyond 'e'
522 * that could result in a non-overflowing code point */
523
524 PERL_ARGS_ASSERT_DOES_UTF8_OVERFLOW;
b0b342d4
KW
525 assert(s <= e && s + UTF8SKIP(s) >= e);
526
527#if ! defined(UV_IS_QUAD) && ! defined(EBCDIC)
528
529 /* On 32 bit ASCII machines, many overlongs that start with FF don't
530 * overflow */
531
c551bb01 532 if (isFF_OVERLONG(s, len)) {
b0b342d4
KW
533 const U8 max_32_bit_overlong[] = "\xFF\x80\x80\x80\x80\x80\x80\x84";
534 return memGE(s, max_32_bit_overlong,
c551bb01 535 MIN(len, sizeof(max_32_bit_overlong) - 1));
b0b342d4
KW
536 }
537
538#endif
12a4bed3
KW
539
540 for (x = s; x < e; x++, y++) {
541
56576a04
KW
542 /* If this byte is larger than the corresponding highest UTF-8
543 * byte, it overflows */
544 if (UNLIKELY(NATIVE_UTF8_TO_I8(*x) > *y)) {
545 return TRUE;
546 }
12a4bed3 547
56576a04
KW
548 /* If not the same as this byte, it must be smaller, doesn't
549 * overflow */
550 if (LIKELY(NATIVE_UTF8_TO_I8(*x) != *y)) {
551 return FALSE;
552 }
12a4bed3 553 }
12a4bed3
KW
554
555 /* Got to the end and all bytes are the same. If the input is a whole
556 * character, it doesn't overflow. And if it is a partial character,
557 * there's not enough information to tell, so assume doesn't overflow */
558 return FALSE;
559}
560
561PERL_STATIC_INLINE bool
562S_is_utf8_overlong_given_start_byte_ok(const U8 * const s, const STRLEN len)
563{
564 /* Overlongs can occur whenever the number of continuation bytes
565 * changes. That means whenever the number of leading 1 bits in a start
566 * byte increases from the next lower start byte. That happens for start
567 * bytes C0, E0, F0, F8, FC, FE, and FF. On modern perls, the following
568 * illegal start bytes have already been excluded, so don't need to be
569 * tested here;
570 * ASCII platforms: C0, C1
571 * EBCDIC platforms C0, C1, C2, C3, C4, E0
572 *
573 * At least a second byte is required to determine if other sequences will
574 * be an overlong. */
575
576 const U8 s0 = NATIVE_UTF8_TO_I8(s[0]);
577 const U8 s1 = NATIVE_UTF8_TO_I8(s[1]);
578
579 PERL_ARGS_ASSERT_IS_UTF8_OVERLONG_GIVEN_START_BYTE_OK;
580 assert(len > 1 && UTF8_IS_START(*s));
581
582 /* Each platform has overlongs after the start bytes given above (expressed
583 * in I8 for EBCDIC). What constitutes an overlong varies by platform, but
584 * the logic is the same, except the E0 overlong has already been excluded
585 * on EBCDIC platforms. The values below were found by manually
586 * inspecting the UTF-8 patterns. See the tables in utf8.h and
587 * utfebcdic.h. */
588
589# ifdef EBCDIC
590# define F0_ABOVE_OVERLONG 0xB0
591# define F8_ABOVE_OVERLONG 0xA8
592# define FC_ABOVE_OVERLONG 0xA4
593# define FE_ABOVE_OVERLONG 0xA2
594# define FF_OVERLONG_PREFIX "\xfe\x41\x41\x41\x41\x41\x41\x41"
595 /* I8(0xfe) is FF */
596# else
597
598 if (s0 == 0xE0 && UNLIKELY(s1 < 0xA0)) {
599 return TRUE;
600 }
601
602# define F0_ABOVE_OVERLONG 0x90
603# define F8_ABOVE_OVERLONG 0x88
604# define FC_ABOVE_OVERLONG 0x84
605# define FE_ABOVE_OVERLONG 0x82
606# define FF_OVERLONG_PREFIX "\xff\x80\x80\x80\x80\x80\x80"
607# endif
608
609
610 if ( (s0 == 0xF0 && UNLIKELY(s1 < F0_ABOVE_OVERLONG))
611 || (s0 == 0xF8 && UNLIKELY(s1 < F8_ABOVE_OVERLONG))
612 || (s0 == 0xFC && UNLIKELY(s1 < FC_ABOVE_OVERLONG))
613 || (s0 == 0xFE && UNLIKELY(s1 < FE_ABOVE_OVERLONG)))
614 {
615 return TRUE;
616 }
617
b0b342d4
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618 /* Check for the FF overlong */
619 return isFF_OVERLONG(s, len);
620}
621
622PERL_STATIC_INLINE bool
623S_isFF_OVERLONG(const U8 * const s, const STRLEN len)
624{
625 PERL_ARGS_ASSERT_ISFF_OVERLONG;
12a4bed3
KW
626
627 /* Check for the FF overlong. This happens only if all these bytes match;
628 * what comes after them doesn't matter. See tables in utf8.h,
b0b342d4 629 * utfebcdic.h. */
12a4bed3 630
b0b342d4
KW
631 return len >= sizeof(FF_OVERLONG_PREFIX) - 1
632 && UNLIKELY(memEQ(s, FF_OVERLONG_PREFIX,
633 sizeof(FF_OVERLONG_PREFIX) - 1));
12a4bed3
KW
634}
635
636#undef F0_ABOVE_OVERLONG
637#undef F8_ABOVE_OVERLONG
638#undef FC_ABOVE_OVERLONG
639#undef FE_ABOVE_OVERLONG
640#undef FF_OVERLONG_PREFIX
641
35f8c9bd 642STRLEN
edc2c47a 643Perl__is_utf8_char_helper(const U8 * const s, const U8 * e, const U32 flags)
35f8c9bd 644{
2b479609 645 STRLEN len;
12a4bed3 646 const U8 *x;
35f8c9bd 647
2b479609
KW
648 /* A helper function that should not be called directly.
649 *
650 * This function returns non-zero if the string beginning at 's' and
651 * looking no further than 'e - 1' is well-formed Perl-extended-UTF-8 for a
652 * code point; otherwise it returns 0. The examination stops after the
653 * first code point in 's' is validated, not looking at the rest of the
654 * input. If 'e' is such that there are not enough bytes to represent a
655 * complete code point, this function will return non-zero anyway, if the
656 * bytes it does have are well-formed UTF-8 as far as they go, and aren't
657 * excluded by 'flags'.
658 *
659 * A non-zero return gives the number of bytes required to represent the
660 * code point. Be aware that if the input is for a partial character, the
661 * return will be larger than 'e - s'.
662 *
663 * This function assumes that the code point represented is UTF-8 variant.
56576a04
KW
664 * The caller should have excluded the possibility of it being invariant
665 * before calling this function.
2b479609
KW
666 *
667 * 'flags' can be 0, or any combination of the UTF8_DISALLOW_foo flags
668 * accepted by L</utf8n_to_uvchr>. If non-zero, this function will return
669 * 0 if the code point represented is well-formed Perl-extended-UTF-8, but
670 * disallowed by the flags. If the input is only for a partial character,
671 * the function will return non-zero if there is any sequence of
672 * well-formed UTF-8 that, when appended to the input sequence, could
673 * result in an allowed code point; otherwise it returns 0. Non characters
674 * cannot be determined based on partial character input. But many of the
675 * other excluded types can be determined with just the first one or two
676 * bytes.
677 *
678 */
679
680 PERL_ARGS_ASSERT__IS_UTF8_CHAR_HELPER;
681
682 assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE
683 |UTF8_DISALLOW_ABOVE_31_BIT)));
684 assert(! UTF8_IS_INVARIANT(*s));
35f8c9bd 685
2b479609 686 /* A variant char must begin with a start byte */
35f8c9bd
KW
687 if (UNLIKELY(! UTF8_IS_START(*s))) {
688 return 0;
689 }
690
edc2c47a
KW
691 /* Examine a maximum of a single whole code point */
692 if (e - s > UTF8SKIP(s)) {
693 e = s + UTF8SKIP(s);
694 }
695
2b479609
KW
696 len = e - s;
697
698 if (flags && isUTF8_POSSIBLY_PROBLEMATIC(*s)) {
699 const U8 s0 = NATIVE_UTF8_TO_I8(s[0]);
35f8c9bd 700
56576a04
KW
701 /* Here, we are disallowing some set of largish code points, and the
702 * first byte indicates the sequence is for a code point that could be
703 * in the excluded set. We generally don't have to look beyond this or
704 * the second byte to see if the sequence is actually for one of the
705 * excluded classes. The code below is derived from this table:
706 *
2b479609
KW
707 * UTF-8 UTF-EBCDIC I8
708 * U+D800: \xED\xA0\x80 \xF1\xB6\xA0\xA0 First surrogate
709 * U+DFFF: \xED\xBF\xBF \xF1\xB7\xBF\xBF Final surrogate
710 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0 First above Unicode
711 *
56576a04
KW
712 * Keep in mind that legal continuation bytes range between \x80..\xBF
713 * for UTF-8, and \xA0..\xBF for I8. Anything above those aren't
714 * continuation bytes. Hence, we don't have to test the upper edge
715 * because if any of those is encountered, the sequence is malformed,
716 * and would fail elsewhere in this function.
717 *
718 * The code here likewise assumes that there aren't other
719 * malformations; again the function should fail elsewhere because of
720 * these. For example, an overlong beginning with FC doesn't actually
721 * have to be a super; it could actually represent a small code point,
722 * even U+0000. But, since overlongs (and other malformations) are
723 * illegal, the function should return FALSE in either case.
2b479609
KW
724 */
725
726#ifdef EBCDIC /* On EBCDIC, these are actually I8 bytes */
727# define FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER 0xFA
19794540 728# define IS_UTF8_2_BYTE_SUPER(s0, s1) ((s0) == 0xF9 && (s1) >= 0xA2)
2b479609 729
19794540
KW
730# define IS_UTF8_2_BYTE_SURROGATE(s0, s1) ((s0) == 0xF1 \
731 /* B6 and B7 */ \
732 && ((s1) & 0xFE ) == 0xB6)
2b479609
KW
733#else
734# define FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER 0xF5
19794540
KW
735# define IS_UTF8_2_BYTE_SUPER(s0, s1) ((s0) == 0xF4 && (s1) >= 0x90)
736# define IS_UTF8_2_BYTE_SURROGATE(s0, s1) ((s0) == 0xED && (s1) >= 0xA0)
2b479609
KW
737#endif
738
739 if ( (flags & UTF8_DISALLOW_SUPER)
ddb65933
KW
740 && UNLIKELY(s0 >= FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER))
741 {
2b479609
KW
742 return 0; /* Above Unicode */
743 }
744
745 if ( (flags & UTF8_DISALLOW_ABOVE_31_BIT)
746 && UNLIKELY(is_utf8_cp_above_31_bits(s, e)))
747 {
748 return 0; /* Above 31 bits */
749 }
750
751 if (len > 1) {
752 const U8 s1 = NATIVE_UTF8_TO_I8(s[1]);
753
754 if ( (flags & UTF8_DISALLOW_SUPER)
19794540 755 && UNLIKELY(IS_UTF8_2_BYTE_SUPER(s0, s1)))
2b479609
KW
756 {
757 return 0; /* Above Unicode */
758 }
759
760 if ( (flags & UTF8_DISALLOW_SURROGATE)
19794540 761 && UNLIKELY(IS_UTF8_2_BYTE_SURROGATE(s0, s1)))
2b479609
KW
762 {
763 return 0; /* Surrogate */
764 }
765
766 if ( (flags & UTF8_DISALLOW_NONCHAR)
767 && UNLIKELY(UTF8_IS_NONCHAR(s, e)))
768 {
769 return 0; /* Noncharacter code point */
770 }
771 }
772 }
773
774 /* Make sure that all that follows are continuation bytes */
35f8c9bd
KW
775 for (x = s + 1; x < e; x++) {
776 if (UNLIKELY(! UTF8_IS_CONTINUATION(*x))) {
777 return 0;
778 }
779 }
780
af13dd8a 781 /* Here is syntactically valid. Next, make sure this isn't the start of an
12a4bed3
KW
782 * overlong. */
783 if (len > 1 && is_utf8_overlong_given_start_byte_ok(s, len)) {
784 return 0;
af13dd8a
KW
785 }
786
12a4bed3
KW
787 /* And finally, that the code point represented fits in a word on this
788 * platform */
789 if (does_utf8_overflow(s, e)) {
790 return 0;
35f8c9bd
KW
791 }
792
2b479609 793 return UTF8SKIP(s);
35f8c9bd
KW
794}
795
7e2f38b2
KW
796char *
797Perl__byte_dump_string(pTHX_ const U8 * s, const STRLEN len, const bool format)
7cf8d05d
KW
798{
799 /* Returns a mortalized C string that is a displayable copy of the 'len'
7e2f38b2
KW
800 * bytes starting at 's'. 'format' gives how to display each byte.
801 * Currently, there are only two formats, so it is currently a bool:
802 * 0 \xab
803 * 1 ab (that is a space between two hex digit bytes)
804 */
7cf8d05d
KW
805
806 const STRLEN output_len = 4 * len + 1; /* 4 bytes per each input, plus a
807 trailing NUL */
808 const U8 * const e = s + len;
809 char * output;
810 char * d;
811
812 PERL_ARGS_ASSERT__BYTE_DUMP_STRING;
813
814 Newx(output, output_len, char);
815 SAVEFREEPV(output);
816
817 d = output;
818 for (; s < e; s++) {
819 const unsigned high_nibble = (*s & 0xF0) >> 4;
820 const unsigned low_nibble = (*s & 0x0F);
821
7e2f38b2
KW
822 if (format) {
823 *d++ = ' ';
824 }
825 else {
826 *d++ = '\\';
827 *d++ = 'x';
828 }
7cf8d05d
KW
829
830 if (high_nibble < 10) {
831 *d++ = high_nibble + '0';
832 }
833 else {
834 *d++ = high_nibble - 10 + 'a';
835 }
836
837 if (low_nibble < 10) {
838 *d++ = low_nibble + '0';
839 }
840 else {
841 *d++ = low_nibble - 10 + 'a';
842 }
843 }
844
845 *d = '\0';
846 return output;
847}
848
806547a7 849PERL_STATIC_INLINE char *
7cf8d05d
KW
850S_unexpected_non_continuation_text(pTHX_ const U8 * const s,
851
852 /* How many bytes to print */
3cc6a05e 853 STRLEN print_len,
7cf8d05d
KW
854
855 /* Which one is the non-continuation */
856 const STRLEN non_cont_byte_pos,
857
858 /* How many bytes should there be? */
859 const STRLEN expect_len)
806547a7
KW
860{
861 /* Return the malformation warning text for an unexpected continuation
862 * byte. */
863
7cf8d05d 864 const char * const where = (non_cont_byte_pos == 1)
806547a7 865 ? "immediately"
7cf8d05d
KW
866 : Perl_form(aTHX_ "%d bytes",
867 (int) non_cont_byte_pos);
806547a7
KW
868
869 PERL_ARGS_ASSERT_UNEXPECTED_NON_CONTINUATION_TEXT;
870
7cf8d05d
KW
871 /* We don't need to pass this parameter, but since it has already been
872 * calculated, it's likely faster to pass it; verify under DEBUGGING */
873 assert(expect_len == UTF8SKIP(s));
874
875 return Perl_form(aTHX_ "%s: %s (unexpected non-continuation byte 0x%02x,"
876 " %s after start byte 0x%02x; need %d bytes, got %d)",
877 malformed_text,
7e2f38b2 878 _byte_dump_string(s, print_len, 0),
7cf8d05d
KW
879 *(s + non_cont_byte_pos),
880 where,
881 *s,
882 (int) expect_len,
883 (int) non_cont_byte_pos);
806547a7
KW
884}
885
35f8c9bd
KW
886/*
887
de69f3af 888=for apidoc utf8n_to_uvchr
378516de
KW
889
890THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
de69f3af 891Most code should use L</utf8_to_uvchr_buf>() rather than call this directly.
67e989fb 892
9041c2e3 893Bottom level UTF-8 decode routine.
de69f3af 894Returns the native code point value of the first character in the string C<s>,
746afd53
KW
895which is assumed to be in UTF-8 (or UTF-EBCDIC) encoding, and no longer than
896C<curlen> bytes; C<*retlen> (if C<retlen> isn't NULL) will be set to
897the length, in bytes, of that character.
949cf498
KW
898
899The value of C<flags> determines the behavior when C<s> does not point to a
2b5e7bc2
KW
900well-formed UTF-8 character. If C<flags> is 0, encountering a malformation
901causes zero to be returned and C<*retlen> is set so that (S<C<s> + C<*retlen>>)
902is the next possible position in C<s> that could begin a non-malformed
903character. Also, if UTF-8 warnings haven't been lexically disabled, a warning
904is raised. Some UTF-8 input sequences may contain multiple malformations.
905This function tries to find every possible one in each call, so multiple
56576a04 906warnings can be raised for the same sequence.
949cf498
KW
907
908Various ALLOW flags can be set in C<flags> to allow (and not warn on)
909individual types of malformations, such as the sequence being overlong (that
910is, when there is a shorter sequence that can express the same code point;
911overlong sequences are expressly forbidden in the UTF-8 standard due to
912potential security issues). Another malformation example is the first byte of
913a character not being a legal first byte. See F<utf8.h> for the list of such
94953955
KW
914flags. Even if allowed, this function generally returns the Unicode
915REPLACEMENT CHARACTER when it encounters a malformation. There are flags in
916F<utf8.h> to override this behavior for the overlong malformations, but don't
917do that except for very specialized purposes.
949cf498 918
796b6530 919The C<UTF8_CHECK_ONLY> flag overrides the behavior when a non-allowed (by other
949cf498
KW
920flags) malformation is found. If this flag is set, the routine assumes that
921the caller will raise a warning, and this function will silently just set
d088425d
KW
922C<retlen> to C<-1> (cast to C<STRLEN>) and return zero.
923
75200dff 924Note that this API requires disambiguation between successful decoding a C<NUL>
796b6530 925character, and an error return (unless the C<UTF8_CHECK_ONLY> flag is set), as
111fa700
KW
926in both cases, 0 is returned, and, depending on the malformation, C<retlen> may
927be set to 1. To disambiguate, upon a zero return, see if the first byte of
928C<s> is 0 as well. If so, the input was a C<NUL>; if not, the input had an
f9380377 929error. Or you can use C<L</utf8n_to_uvchr_error>>.
949cf498
KW
930
931Certain code points are considered problematic. These are Unicode surrogates,
746afd53 932Unicode non-characters, and code points above the Unicode maximum of 0x10FFFF.
949cf498 933By default these are considered regular code points, but certain situations
ecc1615f
KW
934warrant special handling for them, which can be specified using the C<flags>
935parameter. If C<flags> contains C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, all
936three classes are treated as malformations and handled as such. The flags
937C<UTF8_DISALLOW_SURROGATE>, C<UTF8_DISALLOW_NONCHAR>, and
938C<UTF8_DISALLOW_SUPER> (meaning above the legal Unicode maximum) can be set to
939disallow these categories individually. C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>
940restricts the allowed inputs to the strict UTF-8 traditionally defined by
941Unicode. Use C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE> to use the strictness
942definition given by
943L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>.
944The difference between traditional strictness and C9 strictness is that the
945latter does not forbid non-character code points. (They are still discouraged,
946however.) For more discussion see L<perlunicode/Noncharacter code points>.
947
948The flags C<UTF8_WARN_ILLEGAL_INTERCHANGE>,
949C<UTF8_WARN_ILLEGAL_C9_INTERCHANGE>, C<UTF8_WARN_SURROGATE>,
796b6530
KW
950C<UTF8_WARN_NONCHAR>, and C<UTF8_WARN_SUPER> will cause warning messages to be
951raised for their respective categories, but otherwise the code points are
952considered valid (not malformations). To get a category to both be treated as
953a malformation and raise a warning, specify both the WARN and DISALLOW flags.
949cf498 954(But note that warnings are not raised if lexically disabled nor if
796b6530 955C<UTF8_CHECK_ONLY> is also specified.)
949cf498 956
760c7c2f
KW
957It is now deprecated to have very high code points (above C<IV_MAX> on the
958platforms) and this function will raise a deprecation warning for these (unless
d5944cab 959such warnings are turned off). This value is typically 0x7FFF_FFFF (2**31 -1)
760c7c2f 960in a 32-bit word.
ab8e6d41
KW
961
962Code points above 0x7FFF_FFFF (2**31 - 1) were never specified in any standard,
963so using them is more problematic than other above-Unicode code points. Perl
964invented an extension to UTF-8 to represent the ones above 2**36-1, so it is
965likely that non-Perl languages will not be able to read files that contain
aff2be59 966these; nor would Perl understand files
ab8e6d41
KW
967written by something that uses a different extension. For these reasons, there
968is a separate set of flags that can warn and/or disallow these extremely high
969code points, even if other above-Unicode ones are accepted. These are the
760c7c2f
KW
970C<UTF8_WARN_ABOVE_31_BIT> and C<UTF8_DISALLOW_ABOVE_31_BIT> flags. These
971are entirely independent from the deprecation warning for code points above
972C<IV_MAX>. On 32-bit machines, it will eventually be forbidden to have any
973code point that needs more than 31 bits to represent. When that happens,
974effectively the C<UTF8_DISALLOW_ABOVE_31_BIT> flag will always be set on
97532-bit machines. (Of course C<UTF8_DISALLOW_SUPER> will treat all
ab8e6d41
KW
976above-Unicode code points, including these, as malformations; and
977C<UTF8_WARN_SUPER> warns on these.)
978
979On EBCDIC platforms starting in Perl v5.24, the Perl extension for representing
980extremely high code points kicks in at 0x3FFF_FFFF (2**30 -1), which is lower
981than on ASCII. Prior to that, code points 2**31 and higher were simply
982unrepresentable, and a different, incompatible method was used to represent
983code points between 2**30 and 2**31 - 1. The flags C<UTF8_WARN_ABOVE_31_BIT>
984and C<UTF8_DISALLOW_ABOVE_31_BIT> have the same function as on ASCII
985platforms, warning and disallowing 2**31 and higher.
949cf498
KW
986
987All other code points corresponding to Unicode characters, including private
988use and those yet to be assigned, are never considered malformed and never
989warn.
67e989fb 990
37607a96 991=cut
f9380377
KW
992
993Also implemented as a macro in utf8.h
994*/
995
996UV
997Perl_utf8n_to_uvchr(pTHX_ const U8 *s,
998 STRLEN curlen,
999 STRLEN *retlen,
1000 const U32 flags)
1001{
1002 PERL_ARGS_ASSERT_UTF8N_TO_UVCHR;
1003
1004 return utf8n_to_uvchr_error(s, curlen, retlen, flags, NULL);
1005}
1006
1007/*
1008
1009=for apidoc utf8n_to_uvchr_error
1010
1011THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
1012Most code should use L</utf8_to_uvchr_buf>() rather than call this directly.
1013
1014This function is for code that needs to know what the precise malformation(s)
1015are when an error is found.
1016
1017It is like C<L</utf8n_to_uvchr>> but it takes an extra parameter placed after
1018all the others, C<errors>. If this parameter is 0, this function behaves
1019identically to C<L</utf8n_to_uvchr>>. Otherwise, C<errors> should be a pointer
1020to a C<U32> variable, which this function sets to indicate any errors found.
1021Upon return, if C<*errors> is 0, there were no errors found. Otherwise,
1022C<*errors> is the bit-wise C<OR> of the bits described in the list below. Some
1023of these bits will be set if a malformation is found, even if the input
7a65503b 1024C<flags> parameter indicates that the given malformation is allowed; those
f9380377
KW
1025exceptions are noted:
1026
1027=over 4
1028
1029=item C<UTF8_GOT_ABOVE_31_BIT>
1030
1031The code point represented by the input UTF-8 sequence occupies more than 31
1032bits.
1033This bit is set only if the input C<flags> parameter contains either the
1034C<UTF8_DISALLOW_ABOVE_31_BIT> or the C<UTF8_WARN_ABOVE_31_BIT> flags.
1035
1036=item C<UTF8_GOT_CONTINUATION>
1037
1038The input sequence was malformed in that the first byte was a a UTF-8
1039continuation byte.
1040
1041=item C<UTF8_GOT_EMPTY>
1042
1043The input C<curlen> parameter was 0.
1044
1045=item C<UTF8_GOT_LONG>
1046
1047The input sequence was malformed in that there is some other sequence that
1048evaluates to the same code point, but that sequence is shorter than this one.
1049
fecaf136
KW
1050Until Unicode 3.1, it was legal for programs to accept this malformation, but
1051it was discovered that this created security issues.
1052
f9380377
KW
1053=item C<UTF8_GOT_NONCHAR>
1054
1055The code point represented by the input UTF-8 sequence is for a Unicode
1056non-character code point.
1057This bit is set only if the input C<flags> parameter contains either the
1058C<UTF8_DISALLOW_NONCHAR> or the C<UTF8_WARN_NONCHAR> flags.
1059
1060=item C<UTF8_GOT_NON_CONTINUATION>
1061
1062The input sequence was malformed in that a non-continuation type byte was found
1063in a position where only a continuation type one should be.
1064
1065=item C<UTF8_GOT_OVERFLOW>
1066
1067The input sequence was malformed in that it is for a code point that is not
1068representable in the number of bits available in a UV on the current platform.
1069
1070=item C<UTF8_GOT_SHORT>
1071
1072The input sequence was malformed in that C<curlen> is smaller than required for
1073a complete sequence. In other words, the input is for a partial character
1074sequence.
1075
1076=item C<UTF8_GOT_SUPER>
1077
1078The input sequence was malformed in that it is for a non-Unicode code point;
1079that is, one above the legal Unicode maximum.
1080This bit is set only if the input C<flags> parameter contains either the
1081C<UTF8_DISALLOW_SUPER> or the C<UTF8_WARN_SUPER> flags.
1082
1083=item C<UTF8_GOT_SURROGATE>
1084
1085The input sequence was malformed in that it is for a -Unicode UTF-16 surrogate
1086code point.
1087This bit is set only if the input C<flags> parameter contains either the
1088C<UTF8_DISALLOW_SURROGATE> or the C<UTF8_WARN_SURROGATE> flags.
1089
1090=back
1091
133551d8
KW
1092To do your own error handling, call this function with the C<UTF8_CHECK_ONLY>
1093flag to suppress any warnings, and then examine the C<*errors> return.
1094
f9380377 1095=cut
37607a96 1096*/
67e989fb 1097
a0ed51b3 1098UV
f9380377
KW
1099Perl_utf8n_to_uvchr_error(pTHX_ const U8 *s,
1100 STRLEN curlen,
1101 STRLEN *retlen,
1102 const U32 flags,
1103 U32 * errors)
a0ed51b3 1104{
d4c19fe8 1105 const U8 * const s0 = s;
2b5e7bc2
KW
1106 U8 * send = NULL; /* (initialized to silence compilers' wrong
1107 warning) */
1108 U32 possible_problems = 0; /* A bit is set here for each potential problem
1109 found as we go along */
eb83ed87 1110 UV uv = *s;
2b5e7bc2
KW
1111 STRLEN expectlen = 0; /* How long should this sequence be?
1112 (initialized to silence compilers' wrong
1113 warning) */
e308b348 1114 STRLEN avail_len = 0; /* When input is too short, gives what that is */
f9380377
KW
1115 U32 discard_errors = 0; /* Used to save branches when 'errors' is NULL;
1116 this gets set and discarded */
a0dbb045 1117
2b5e7bc2
KW
1118 /* The below are used only if there is both an overlong malformation and a
1119 * too short one. Otherwise the first two are set to 's0' and 'send', and
1120 * the third not used at all */
1121 U8 * adjusted_s0 = (U8 *) s0;
5ec712b1
KW
1122 U8 * adjusted_send = NULL; /* (Initialized to silence compilers' wrong
1123 warning) */
e9f2c446
KW
1124 U8 temp_char_buf[UTF8_MAXBYTES + 1]; /* Used to avoid a Newx in this
1125 routine; see [perl #130921] */
2b5e7bc2 1126 UV uv_so_far = 0; /* (Initialized to silence compilers' wrong warning) */
7918f24d 1127
f9380377
KW
1128 PERL_ARGS_ASSERT_UTF8N_TO_UVCHR_ERROR;
1129
1130 if (errors) {
1131 *errors = 0;
1132 }
1133 else {
1134 errors = &discard_errors;
1135 }
a0dbb045 1136
eb83ed87
KW
1137 /* The order of malformation tests here is important. We should consume as
1138 * few bytes as possible in order to not skip any valid character. This is
1139 * required by the Unicode Standard (section 3.9 of Unicode 6.0); see also
1140 * http://unicode.org/reports/tr36 for more discussion as to why. For
1141 * example, once we've done a UTF8SKIP, we can tell the expected number of
1142 * bytes, and could fail right off the bat if the input parameters indicate
1143 * that there are too few available. But it could be that just that first
1144 * byte is garbled, and the intended character occupies fewer bytes. If we
1145 * blindly assumed that the first byte is correct, and skipped based on
1146 * that number, we could skip over a valid input character. So instead, we
1147 * always examine the sequence byte-by-byte.
1148 *
1149 * We also should not consume too few bytes, otherwise someone could inject
1150 * things. For example, an input could be deliberately designed to
1151 * overflow, and if this code bailed out immediately upon discovering that,
e2660c54 1152 * returning to the caller C<*retlen> pointing to the very next byte (one
eb83ed87
KW
1153 * which is actually part of of the overflowing sequence), that could look
1154 * legitimate to the caller, which could discard the initial partial
2b5e7bc2
KW
1155 * sequence and process the rest, inappropriately.
1156 *
1157 * Some possible input sequences are malformed in more than one way. This
1158 * function goes to lengths to try to find all of them. This is necessary
1159 * for correctness, as the inputs may allow one malformation but not
1160 * another, and if we abandon searching for others after finding the
1161 * allowed one, we could allow in something that shouldn't have been.
1162 */
eb83ed87 1163
b5b9af04 1164 if (UNLIKELY(curlen == 0)) {
2b5e7bc2
KW
1165 possible_problems |= UTF8_GOT_EMPTY;
1166 curlen = 0;
5a48568d 1167 uv = UNICODE_REPLACEMENT;
2b5e7bc2 1168 goto ready_to_handle_errors;
0c443dc2
JH
1169 }
1170
eb83ed87
KW
1171 expectlen = UTF8SKIP(s);
1172
1173 /* A well-formed UTF-8 character, as the vast majority of calls to this
1174 * function will be for, has this expected length. For efficiency, set
1175 * things up here to return it. It will be overriden only in those rare
1176 * cases where a malformation is found */
1177 if (retlen) {
1178 *retlen = expectlen;
1179 }
1180
1181 /* An invariant is trivially well-formed */
1d72bdf6 1182 if (UTF8_IS_INVARIANT(uv)) {
de69f3af 1183 return uv;
a0ed51b3 1184 }
67e989fb 1185
eb83ed87 1186 /* A continuation character can't start a valid sequence */
b5b9af04 1187 if (UNLIKELY(UTF8_IS_CONTINUATION(uv))) {
2b5e7bc2
KW
1188 possible_problems |= UTF8_GOT_CONTINUATION;
1189 curlen = 1;
1190 uv = UNICODE_REPLACEMENT;
1191 goto ready_to_handle_errors;
ba210ebe 1192 }
9041c2e3 1193
dcd27b3c 1194 /* Here is not a continuation byte, nor an invariant. The only thing left
ddb65933
KW
1195 * is a start byte (possibly for an overlong). (We can't use UTF8_IS_START
1196 * because it excludes start bytes like \xC0 that always lead to
1197 * overlongs.) */
dcd27b3c 1198
534752c1
KW
1199 /* Convert to I8 on EBCDIC (no-op on ASCII), then remove the leading bits
1200 * that indicate the number of bytes in the character's whole UTF-8
1201 * sequence, leaving just the bits that are part of the value. */
1202 uv = NATIVE_UTF8_TO_I8(uv) & UTF_START_MASK(expectlen);
ba210ebe 1203
e308b348
KW
1204 /* Setup the loop end point, making sure to not look past the end of the
1205 * input string, and flag it as too short if the size isn't big enough. */
1206 send = (U8*) s0;
1207 if (UNLIKELY(curlen < expectlen)) {
1208 possible_problems |= UTF8_GOT_SHORT;
1209 avail_len = curlen;
1210 send += curlen;
1211 }
1212 else {
1213 send += expectlen;
1214 }
1215 adjusted_send = send;
1216
eb83ed87 1217 /* Now, loop through the remaining bytes in the character's sequence,
e308b348 1218 * accumulating each into the working value as we go. */
eb83ed87 1219 for (s = s0 + 1; s < send; s++) {
b5b9af04 1220 if (LIKELY(UTF8_IS_CONTINUATION(*s))) {
8850bf83 1221 uv = UTF8_ACCUMULATE(uv, *s);
2b5e7bc2
KW
1222 continue;
1223 }
1224
1225 /* Here, found a non-continuation before processing all expected bytes.
1226 * This byte indicates the beginning of a new character, so quit, even
1227 * if allowing this malformation. */
2b5e7bc2 1228 possible_problems |= UTF8_GOT_NON_CONTINUATION;
e308b348 1229 break;
eb83ed87
KW
1230 } /* End of loop through the character's bytes */
1231
1232 /* Save how many bytes were actually in the character */
1233 curlen = s - s0;
1234
2b5e7bc2
KW
1235 /* Note that there are two types of too-short malformation. One is when
1236 * there is actual wrong data before the normal termination of the
1237 * sequence. The other is that the sequence wasn't complete before the end
1238 * of the data we are allowed to look at, based on the input 'curlen'.
1239 * This means that we were passed data for a partial character, but it is
1240 * valid as far as we saw. The other is definitely invalid. This
1241 * distinction could be important to a caller, so the two types are kept
15b010f0
KW
1242 * separate.
1243 *
1244 * A convenience macro that matches either of the too-short conditions. */
1245# define UTF8_GOT_TOO_SHORT (UTF8_GOT_SHORT|UTF8_GOT_NON_CONTINUATION)
1246
1247 if (UNLIKELY(possible_problems & UTF8_GOT_TOO_SHORT)) {
1248 uv_so_far = uv;
1249 uv = UNICODE_REPLACEMENT;
1250 }
2b5e7bc2 1251
56576a04 1252 /* Check for overflow. */
2b5e7bc2
KW
1253 if (UNLIKELY(does_utf8_overflow(s0, send))) {
1254 possible_problems |= UTF8_GOT_OVERFLOW;
1255 uv = UNICODE_REPLACEMENT;
eb83ed87 1256 }
eb83ed87 1257
2b5e7bc2
KW
1258 /* Check for overlong. If no problems so far, 'uv' is the correct code
1259 * point value. Simply see if it is expressible in fewer bytes. Otherwise
1260 * we must look at the UTF-8 byte sequence itself to see if it is for an
1261 * overlong */
1262 if ( ( LIKELY(! possible_problems)
1263 && UNLIKELY(expectlen > (STRLEN) OFFUNISKIP(uv)))
56576a04 1264 || ( UNLIKELY(possible_problems)
2b5e7bc2
KW
1265 && ( UNLIKELY(! UTF8_IS_START(*s0))
1266 || ( curlen > 1
1267 && UNLIKELY(is_utf8_overlong_given_start_byte_ok(s0,
1268 send - s0))))))
2f8f112e 1269 {
2b5e7bc2
KW
1270 possible_problems |= UTF8_GOT_LONG;
1271
abc28b54 1272 if ( UNLIKELY( possible_problems & UTF8_GOT_TOO_SHORT)
56576a04 1273
abc28b54
KW
1274 /* The calculation in the 'true' branch of this 'if'
1275 * below won't work if overflows, and isn't needed
1276 * anyway. Further below we handle all overflow
1277 * cases */
1278 && LIKELY(! (possible_problems & UTF8_GOT_OVERFLOW)))
1279 {
2b5e7bc2
KW
1280 UV min_uv = uv_so_far;
1281 STRLEN i;
1282
1283 /* Here, the input is both overlong and is missing some trailing
1284 * bytes. There is no single code point it could be for, but there
1285 * may be enough information present to determine if what we have
1286 * so far is for an unallowed code point, such as for a surrogate.
56576a04
KW
1287 * The code further below has the intelligence to determine this,
1288 * but just for non-overlong UTF-8 sequences. What we do here is
1289 * calculate the smallest code point the input could represent if
1290 * there were no too short malformation. Then we compute and save
1291 * the UTF-8 for that, which is what the code below looks at
1292 * instead of the raw input. It turns out that the smallest such
1293 * code point is all we need. */
2b5e7bc2
KW
1294 for (i = curlen; i < expectlen; i++) {
1295 min_uv = UTF8_ACCUMULATE(min_uv,
1296 I8_TO_NATIVE_UTF8(UTF_CONTINUATION_MARK));
1297 }
1298
e9f2c446 1299 adjusted_s0 = temp_char_buf;
2b5e7bc2
KW
1300 adjusted_send = uvoffuni_to_utf8_flags(adjusted_s0, min_uv, 0);
1301 }
eb83ed87
KW
1302 }
1303
56576a04
KW
1304 /* Here, we have found all the possible problems, except for when the input
1305 * is for a problematic code point not allowed by the input parameters. */
1306
06188866
KW
1307 /* uv is valid for overlongs */
1308 if ( ( ( LIKELY(! (possible_problems & ~UTF8_GOT_LONG))
1309
1310 /* isn't problematic if < this */
1311 && uv >= UNICODE_SURROGATE_FIRST)
2b5e7bc2 1312 || ( UNLIKELY(possible_problems)
d60baaa7
KW
1313
1314 /* if overflow, we know without looking further
1315 * precisely which of the problematic types it is,
1316 * and we deal with those in the overflow handling
1317 * code */
1318 && LIKELY(! (possible_problems & UTF8_GOT_OVERFLOW))
2b5e7bc2 1319 && isUTF8_POSSIBLY_PROBLEMATIC(*adjusted_s0)))
760c7c2f
KW
1320 && ((flags & ( UTF8_DISALLOW_NONCHAR
1321 |UTF8_DISALLOW_SURROGATE
1322 |UTF8_DISALLOW_SUPER
1323 |UTF8_DISALLOW_ABOVE_31_BIT
1324 |UTF8_WARN_NONCHAR
1325 |UTF8_WARN_SURROGATE
1326 |UTF8_WARN_SUPER
1327 |UTF8_WARN_ABOVE_31_BIT))
2b5e7bc2
KW
1328 /* In case of a malformation, 'uv' is not valid, and has
1329 * been changed to something in the Unicode range.
1330 * Currently we don't output a deprecation message if there
1331 * is already a malformation, so we don't have to special
1332 * case the test immediately below */
760c7c2f
KW
1333 || ( UNLIKELY(uv > MAX_NON_DEPRECATED_CP)
1334 && ckWARN_d(WARN_DEPRECATED))))
eb83ed87 1335 {
2b5e7bc2
KW
1336 /* If there were no malformations, or the only malformation is an
1337 * overlong, 'uv' is valid */
1338 if (LIKELY(! (possible_problems & ~UTF8_GOT_LONG))) {
1339 if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
1340 possible_problems |= UTF8_GOT_SURROGATE;
1341 }
1342 else if (UNLIKELY(uv > PERL_UNICODE_MAX)) {
1343 possible_problems |= UTF8_GOT_SUPER;
1344 }
1345 else if (UNLIKELY(UNICODE_IS_NONCHAR(uv))) {
1346 possible_problems |= UTF8_GOT_NONCHAR;
1347 }
1348 }
1349 else { /* Otherwise, need to look at the source UTF-8, possibly
1350 adjusted to be non-overlong */
1351
1352 if (UNLIKELY(NATIVE_UTF8_TO_I8(*adjusted_s0)
1353 >= FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER))
ea5ced44 1354 {
2b5e7bc2
KW
1355 possible_problems |= UTF8_GOT_SUPER;
1356 }
1357 else if (curlen > 1) {
1358 if (UNLIKELY(IS_UTF8_2_BYTE_SUPER(
1359 NATIVE_UTF8_TO_I8(*adjusted_s0),
1360 NATIVE_UTF8_TO_I8(*(adjusted_s0 + 1)))))
ea5ced44 1361 {
2b5e7bc2 1362 possible_problems |= UTF8_GOT_SUPER;
ea5ced44 1363 }
2b5e7bc2
KW
1364 else if (UNLIKELY(IS_UTF8_2_BYTE_SURROGATE(
1365 NATIVE_UTF8_TO_I8(*adjusted_s0),
1366 NATIVE_UTF8_TO_I8(*(adjusted_s0 + 1)))))
1367 {
1368 possible_problems |= UTF8_GOT_SURROGATE;
ea5ced44
KW
1369 }
1370 }
c0236afe 1371
2b5e7bc2
KW
1372 /* We need a complete well-formed UTF-8 character to discern
1373 * non-characters, so can't look for them here */
1374 }
1375 }
949cf498 1376
2b5e7bc2
KW
1377 ready_to_handle_errors:
1378
1379 /* At this point:
1380 * curlen contains the number of bytes in the sequence that
1381 * this call should advance the input by.
e308b348
KW
1382 * avail_len gives the available number of bytes passed in, but
1383 * only if this is less than the expected number of
1384 * bytes, based on the code point's start byte.
2b5e7bc2
KW
1385 * possible_problems' is 0 if there weren't any problems; otherwise a bit
1386 * is set in it for each potential problem found.
1387 * uv contains the code point the input sequence
1388 * represents; or if there is a problem that prevents
1389 * a well-defined value from being computed, it is
1390 * some subsitute value, typically the REPLACEMENT
1391 * CHARACTER.
1392 * s0 points to the first byte of the character
56576a04
KW
1393 * s points to just after were we left off processing
1394 * the character
1395 * send points to just after where that character should
1396 * end, based on how many bytes the start byte tells
1397 * us should be in it, but no further than s0 +
1398 * avail_len
2b5e7bc2
KW
1399 * adjusted_s0 normally is the same as s0, but in case of an
1400 * overlong for which the UTF-8 matters below, it is
1401 * the first byte of the shortest form representation
1402 * of the input.
1403 * adjusted_send normally is the same as 'send', but if adjusted_s0
1404 * is set to something other than s0, this points one
1405 * beyond its end
1406 */
eb83ed87 1407
2b5e7bc2
KW
1408 if (UNLIKELY(possible_problems)) {
1409 bool disallowed = FALSE;
1410 const U32 orig_problems = possible_problems;
1411
1412 while (possible_problems) { /* Handle each possible problem */
1413 UV pack_warn = 0;
1414 char * message = NULL;
1415
1416 /* Each 'if' clause handles one problem. They are ordered so that
1417 * the first ones' messages will be displayed before the later
6c64cd9d
KW
1418 * ones; this is kinda in decreasing severity order. But the
1419 * overlong must come last, as it changes 'uv' looked at by the
1420 * others */
2b5e7bc2
KW
1421 if (possible_problems & UTF8_GOT_OVERFLOW) {
1422
56576a04
KW
1423 /* Overflow means also got a super and are using Perl's
1424 * extended UTF-8, but we handle all three cases here */
2b5e7bc2
KW
1425 possible_problems
1426 &= ~(UTF8_GOT_OVERFLOW|UTF8_GOT_SUPER|UTF8_GOT_ABOVE_31_BIT);
f9380377
KW
1427 *errors |= UTF8_GOT_OVERFLOW;
1428
1429 /* But the API says we flag all errors found */
1430 if (flags & (UTF8_WARN_SUPER|UTF8_DISALLOW_SUPER)) {
1431 *errors |= UTF8_GOT_SUPER;
1432 }
ddb65933
KW
1433 if (flags
1434 & (UTF8_WARN_ABOVE_31_BIT|UTF8_DISALLOW_ABOVE_31_BIT))
1435 {
f9380377
KW
1436 *errors |= UTF8_GOT_ABOVE_31_BIT;
1437 }
2b5e7bc2 1438
d60baaa7 1439 /* Disallow if any of the three categories say to */
56576a04 1440 if ( ! (flags & UTF8_ALLOW_OVERFLOW)
d60baaa7
KW
1441 || (flags & ( UTF8_DISALLOW_SUPER
1442 |UTF8_DISALLOW_ABOVE_31_BIT)))
1443 {
1444 disallowed = TRUE;
1445 }
1446
d60baaa7
KW
1447 /* Likewise, warn if any say to, plus if deprecation warnings
1448 * are on, because this code point is above IV_MAX */
56576a04 1449 if ( ckWARN_d(WARN_DEPRECATED)
d60baaa7
KW
1450 || ! (flags & UTF8_ALLOW_OVERFLOW)
1451 || (flags & (UTF8_WARN_SUPER|UTF8_WARN_ABOVE_31_BIT)))
1452 {
2b5e7bc2 1453
ddb65933
KW
1454 /* The warnings code explicitly says it doesn't handle the
1455 * case of packWARN2 and two categories which have
1456 * parent-child relationship. Even if it works now to
1457 * raise the warning if either is enabled, it wouldn't
1458 * necessarily do so in the future. We output (only) the
56576a04 1459 * most dire warning */
ddb65933
KW
1460 if (! (flags & UTF8_CHECK_ONLY)) {
1461 if (ckWARN_d(WARN_UTF8)) {
1462 pack_warn = packWARN(WARN_UTF8);
1463 }
1464 else if (ckWARN_d(WARN_NON_UNICODE)) {
1465 pack_warn = packWARN(WARN_NON_UNICODE);
1466 }
1467 if (pack_warn) {
1468 message = Perl_form(aTHX_ "%s: %s (overflows)",
1469 malformed_text,
05b9033b 1470 _byte_dump_string(s0, curlen, 0));
ddb65933 1471 }
2b5e7bc2
KW
1472 }
1473 }
1474 }
1475 else if (possible_problems & UTF8_GOT_EMPTY) {
1476 possible_problems &= ~UTF8_GOT_EMPTY;
f9380377 1477 *errors |= UTF8_GOT_EMPTY;
2b5e7bc2
KW
1478
1479 if (! (flags & UTF8_ALLOW_EMPTY)) {
d1f8d421
KW
1480
1481 /* This so-called malformation is now treated as a bug in
1482 * the caller. If you have nothing to decode, skip calling
1483 * this function */
1484 assert(0);
1485
2b5e7bc2
KW
1486 disallowed = TRUE;
1487 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1488 pack_warn = packWARN(WARN_UTF8);
1489 message = Perl_form(aTHX_ "%s (empty string)",
1490 malformed_text);
1491 }
1492 }
1493 }
1494 else if (possible_problems & UTF8_GOT_CONTINUATION) {
1495 possible_problems &= ~UTF8_GOT_CONTINUATION;
f9380377 1496 *errors |= UTF8_GOT_CONTINUATION;
2b5e7bc2
KW
1497
1498 if (! (flags & UTF8_ALLOW_CONTINUATION)) {
1499 disallowed = TRUE;
1500 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1501 pack_warn = packWARN(WARN_UTF8);
1502 message = Perl_form(aTHX_
1503 "%s: %s (unexpected continuation byte 0x%02x,"
1504 " with no preceding start byte)",
1505 malformed_text,
7e2f38b2 1506 _byte_dump_string(s0, 1, 0), *s0);
2b5e7bc2
KW
1507 }
1508 }
1509 }
2b5e7bc2
KW
1510 else if (possible_problems & UTF8_GOT_SHORT) {
1511 possible_problems &= ~UTF8_GOT_SHORT;
f9380377 1512 *errors |= UTF8_GOT_SHORT;
2b5e7bc2
KW
1513
1514 if (! (flags & UTF8_ALLOW_SHORT)) {
1515 disallowed = TRUE;
1516 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1517 pack_warn = packWARN(WARN_UTF8);
1518 message = Perl_form(aTHX_
56576a04
KW
1519 "%s: %s (too short; %d byte%s available, need %d)",
1520 malformed_text,
1521 _byte_dump_string(s0, send - s0, 0),
1522 (int)avail_len,
1523 avail_len == 1 ? "" : "s",
1524 (int)expectlen);
2b5e7bc2
KW
1525 }
1526 }
ba210ebe 1527
2b5e7bc2 1528 }
e308b348
KW
1529 else if (possible_problems & UTF8_GOT_NON_CONTINUATION) {
1530 possible_problems &= ~UTF8_GOT_NON_CONTINUATION;
1531 *errors |= UTF8_GOT_NON_CONTINUATION;
1532
1533 if (! (flags & UTF8_ALLOW_NON_CONTINUATION)) {
1534 disallowed = TRUE;
1535 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
99a765e9
KW
1536
1537 /* If we don't know for sure that the input length is
1538 * valid, avoid as much as possible reading past the
1539 * end of the buffer */
1540 int printlen = (flags & _UTF8_NO_CONFIDENCE_IN_CURLEN)
1541 ? s - s0
1542 : send - s0;
e308b348
KW
1543 pack_warn = packWARN(WARN_UTF8);
1544 message = Perl_form(aTHX_ "%s",
1545 unexpected_non_continuation_text(s0,
99a765e9 1546 printlen,
e308b348
KW
1547 s - s0,
1548 (int) expectlen));
1549 }
1550 }
1551 }
2b5e7bc2
KW
1552 else if (possible_problems & UTF8_GOT_SURROGATE) {
1553 possible_problems &= ~UTF8_GOT_SURROGATE;
1554
f9380377
KW
1555 if (flags & UTF8_WARN_SURROGATE) {
1556 *errors |= UTF8_GOT_SURROGATE;
1557
1558 if ( ! (flags & UTF8_CHECK_ONLY)
1559 && ckWARN_d(WARN_SURROGATE))
1560 {
2b5e7bc2
KW
1561 pack_warn = packWARN(WARN_SURROGATE);
1562
1563 /* These are the only errors that can occur with a
1564 * surrogate when the 'uv' isn't valid */
1565 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1566 message = Perl_form(aTHX_
1567 "UTF-16 surrogate (any UTF-8 sequence that"
1568 " starts with \"%s\" is for a surrogate)",
7e2f38b2 1569 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1570 }
1571 else {
c94c2f39 1572 message = Perl_form(aTHX_ surrogate_cp_format, uv);
2b5e7bc2 1573 }
f9380377 1574 }
2b5e7bc2 1575 }
ba210ebe 1576
2b5e7bc2
KW
1577 if (flags & UTF8_DISALLOW_SURROGATE) {
1578 disallowed = TRUE;
f9380377 1579 *errors |= UTF8_GOT_SURROGATE;
2b5e7bc2
KW
1580 }
1581 }
1582 else if (possible_problems & UTF8_GOT_SUPER) {
1583 possible_problems &= ~UTF8_GOT_SUPER;
949cf498 1584
f9380377
KW
1585 if (flags & UTF8_WARN_SUPER) {
1586 *errors |= UTF8_GOT_SUPER;
1587
1588 if ( ! (flags & UTF8_CHECK_ONLY)
1589 && ckWARN_d(WARN_NON_UNICODE))
1590 {
2b5e7bc2
KW
1591 pack_warn = packWARN(WARN_NON_UNICODE);
1592
1593 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1594 message = Perl_form(aTHX_
1595 "Any UTF-8 sequence that starts with"
1596 " \"%s\" is for a non-Unicode code point,"
1597 " may not be portable",
7e2f38b2 1598 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1599 }
1600 else {
c94c2f39 1601 message = Perl_form(aTHX_ super_cp_format, uv);
2b5e7bc2 1602 }
f9380377 1603 }
2b5e7bc2 1604 }
ba210ebe 1605
2b5e7bc2
KW
1606 /* The maximum code point ever specified by a standard was
1607 * 2**31 - 1. Anything larger than that is a Perl extension
1608 * that very well may not be understood by other applications
1609 * (including earlier perl versions on EBCDIC platforms). We
1610 * test for these after the regular SUPER ones, and before
1611 * possibly bailing out, so that the slightly more dire warning
1612 * will override the regular one. */
1613 if ( (flags & (UTF8_WARN_ABOVE_31_BIT
1614 |UTF8_WARN_SUPER
1615 |UTF8_DISALLOW_ABOVE_31_BIT))
1616 && ( ( UNLIKELY(orig_problems & UTF8_GOT_TOO_SHORT)
1617 && UNLIKELY(is_utf8_cp_above_31_bits(
56576a04
KW
1618 adjusted_s0,
1619 adjusted_send)))
2b5e7bc2
KW
1620 || ( LIKELY(! (orig_problems & UTF8_GOT_TOO_SHORT))
1621 && UNLIKELY(UNICODE_IS_ABOVE_31_BIT(uv)))))
1622 {
1623 if ( ! (flags & UTF8_CHECK_ONLY)
1624 && (flags & (UTF8_WARN_ABOVE_31_BIT|UTF8_WARN_SUPER))
db0f09e6 1625 && ckWARN_d(WARN_NON_UNICODE))
2b5e7bc2 1626 {
db0f09e6 1627 pack_warn = packWARN(WARN_NON_UNICODE);
2b5e7bc2
KW
1628
1629 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1630 message = Perl_form(aTHX_
1631 "Any UTF-8 sequence that starts with"
1632 " \"%s\" is for a non-Unicode code"
1633 " point, and is not portable",
7e2f38b2 1634 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1635 }
1636 else {
1637 message = Perl_form(aTHX_
c94c2f39 1638 above_31_bit_cp_format, uv);
2b5e7bc2
KW
1639 }
1640 }
1641
ddb65933
KW
1642 if (flags & ( UTF8_WARN_ABOVE_31_BIT
1643 |UTF8_DISALLOW_ABOVE_31_BIT))
1644 {
f9380377
KW
1645 *errors |= UTF8_GOT_ABOVE_31_BIT;
1646
1647 if (flags & UTF8_DISALLOW_ABOVE_31_BIT) {
1648 disallowed = TRUE;
1649 }
2b5e7bc2
KW
1650 }
1651 }
eb83ed87 1652
2b5e7bc2 1653 if (flags & UTF8_DISALLOW_SUPER) {
f9380377 1654 *errors |= UTF8_GOT_SUPER;
2b5e7bc2
KW
1655 disallowed = TRUE;
1656 }
eb83ed87 1657
2b5e7bc2
KW
1658 /* The deprecated warning overrides any non-deprecated one. If
1659 * there are other problems, a deprecation message is not
1660 * really helpful, so don't bother to raise it in that case.
1661 * This also keeps the code from having to handle the case
1662 * where 'uv' is not valid. */
1663 if ( ! (orig_problems
1664 & (UTF8_GOT_TOO_SHORT|UTF8_GOT_OVERFLOW))
76513bdc
KW
1665 && UNLIKELY(uv > MAX_NON_DEPRECATED_CP)
1666 && ckWARN_d(WARN_DEPRECATED))
1667 {
1668 message = Perl_form(aTHX_ cp_above_legal_max,
1669 uv, MAX_NON_DEPRECATED_CP);
1670 pack_warn = packWARN(WARN_DEPRECATED);
2b5e7bc2
KW
1671 }
1672 }
1673 else if (possible_problems & UTF8_GOT_NONCHAR) {
1674 possible_problems &= ~UTF8_GOT_NONCHAR;
ba210ebe 1675
f9380377
KW
1676 if (flags & UTF8_WARN_NONCHAR) {
1677 *errors |= UTF8_GOT_NONCHAR;
1678
1679 if ( ! (flags & UTF8_CHECK_ONLY)
1680 && ckWARN_d(WARN_NONCHAR))
1681 {
2b5e7bc2
KW
1682 /* The code above should have guaranteed that we don't
1683 * get here with errors other than overlong */
1684 assert (! (orig_problems
1685 & ~(UTF8_GOT_LONG|UTF8_GOT_NONCHAR)));
1686
1687 pack_warn = packWARN(WARN_NONCHAR);
c94c2f39 1688 message = Perl_form(aTHX_ nonchar_cp_format, uv);
f9380377 1689 }
2b5e7bc2 1690 }
5b311467 1691
2b5e7bc2
KW
1692 if (flags & UTF8_DISALLOW_NONCHAR) {
1693 disallowed = TRUE;
f9380377 1694 *errors |= UTF8_GOT_NONCHAR;
2b5e7bc2 1695 }
6c64cd9d
KW
1696 }
1697 else if (possible_problems & UTF8_GOT_LONG) {
1698 possible_problems &= ~UTF8_GOT_LONG;
1699 *errors |= UTF8_GOT_LONG;
1700
1701 if (flags & UTF8_ALLOW_LONG) {
1702
1703 /* We don't allow the actual overlong value, unless the
1704 * special extra bit is also set */
1705 if (! (flags & ( UTF8_ALLOW_LONG_AND_ITS_VALUE
1706 & ~UTF8_ALLOW_LONG)))
1707 {
1708 uv = UNICODE_REPLACEMENT;
1709 }
1710 }
1711 else {
1712 disallowed = TRUE;
1713
1714 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1715 pack_warn = packWARN(WARN_UTF8);
1716
1717 /* These error types cause 'uv' to be something that
1718 * isn't what was intended, so can't use it in the
1719 * message. The other error types either can't
1720 * generate an overlong, or else the 'uv' is valid */
1721 if (orig_problems &
1722 (UTF8_GOT_TOO_SHORT|UTF8_GOT_OVERFLOW))
1723 {
1724 message = Perl_form(aTHX_
1725 "%s: %s (any UTF-8 sequence that starts"
1726 " with \"%s\" is overlong which can and"
1727 " should be represented with a"
1728 " different, shorter sequence)",
1729 malformed_text,
1730 _byte_dump_string(s0, send - s0, 0),
1731 _byte_dump_string(s0, curlen, 0));
1732 }
1733 else {
1734 U8 tmpbuf[UTF8_MAXBYTES+1];
1735 const U8 * const e = uvoffuni_to_utf8_flags(tmpbuf,
1736 uv, 0);
1737 const char * preface = (uv <= PERL_UNICODE_MAX)
1738 ? "U+"
1739 : "0x";
1740 message = Perl_form(aTHX_
1741 "%s: %s (overlong; instead use %s to represent"
1742 " %s%0*" UVXf ")",
1743 malformed_text,
1744 _byte_dump_string(s0, send - s0, 0),
1745 _byte_dump_string(tmpbuf, e - tmpbuf, 0),
1746 preface,
1747 ((uv < 256) ? 2 : 4), /* Field width of 2 for
1748 small code points */
1749 uv);
1750 }
1751 }
1752 }
2b5e7bc2
KW
1753 } /* End of looking through the possible flags */
1754
1755 /* Display the message (if any) for the problem being handled in
1756 * this iteration of the loop */
1757 if (message) {
1758 if (PL_op)
1759 Perl_warner(aTHX_ pack_warn, "%s in %s", message,
1760 OP_DESC(PL_op));
1761 else
1762 Perl_warner(aTHX_ pack_warn, "%s", message);
1763 }
ddb65933 1764 } /* End of 'while (possible_problems)' */
a0dbb045 1765
2b5e7bc2
KW
1766 /* Since there was a possible problem, the returned length may need to
1767 * be changed from the one stored at the beginning of this function.
1768 * Instead of trying to figure out if that's needed, just do it. */
1769 if (retlen) {
1770 *retlen = curlen;
1771 }
a0dbb045 1772
2b5e7bc2
KW
1773 if (disallowed) {
1774 if (flags & UTF8_CHECK_ONLY && retlen) {
1775 *retlen = ((STRLEN) -1);
1776 }
1777 return 0;
1778 }
eb83ed87 1779 }
ba210ebe 1780
2b5e7bc2 1781 return UNI_TO_NATIVE(uv);
a0ed51b3
LW
1782}
1783
8e84507e 1784/*
ec5f19d0
KW
1785=for apidoc utf8_to_uvchr_buf
1786
1787Returns the native code point of the first character in the string C<s> which
1788is assumed to be in UTF-8 encoding; C<send> points to 1 beyond the end of C<s>.
524080c4 1789C<*retlen> will be set to the length, in bytes, of that character.
ec5f19d0 1790
524080c4
KW
1791If C<s> does not point to a well-formed UTF-8 character and UTF8 warnings are
1792enabled, zero is returned and C<*retlen> is set (if C<retlen> isn't
796b6530 1793C<NULL>) to -1. If those warnings are off, the computed value, if well-defined
173db420 1794(or the Unicode REPLACEMENT CHARACTER if not), is silently returned, and
796b6530 1795C<*retlen> is set (if C<retlen> isn't C<NULL>) so that (S<C<s> + C<*retlen>>) is
173db420 1796the next possible position in C<s> that could begin a non-malformed character.
de69f3af 1797See L</utf8n_to_uvchr> for details on when the REPLACEMENT CHARACTER is
173db420 1798returned.
ec5f19d0 1799
760c7c2f
KW
1800Code points above the platform's C<IV_MAX> will raise a deprecation warning,
1801unless those are turned off.
1802
ec5f19d0 1803=cut
52be2536
KW
1804
1805Also implemented as a macro in utf8.h
1806
ec5f19d0
KW
1807*/
1808
1809
1810UV
1811Perl_utf8_to_uvchr_buf(pTHX_ const U8 *s, const U8 *send, STRLEN *retlen)
1812{
7f974d7e
KW
1813 PERL_ARGS_ASSERT_UTF8_TO_UVCHR_BUF;
1814
ec5f19d0
KW
1815 assert(s < send);
1816
1817 return utf8n_to_uvchr(s, send - s, retlen,
ddb65933 1818 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY);
ec5f19d0
KW
1819}
1820
52be2536
KW
1821/* This is marked as deprecated
1822 *
ec5f19d0
KW
1823=for apidoc utf8_to_uvuni_buf
1824
de69f3af
KW
1825Only in very rare circumstances should code need to be dealing in Unicode
1826(as opposed to native) code points. In those few cases, use
1827C<L<NATIVE_TO_UNI(utf8_to_uvchr_buf(...))|/utf8_to_uvchr_buf>> instead.
4f83cdcd
KW
1828
1829Returns the Unicode (not-native) code point of the first character in the
1830string C<s> which
ec5f19d0
KW
1831is assumed to be in UTF-8 encoding; C<send> points to 1 beyond the end of C<s>.
1832C<retlen> will be set to the length, in bytes, of that character.
1833
524080c4
KW
1834If C<s> does not point to a well-formed UTF-8 character and UTF8 warnings are
1835enabled, zero is returned and C<*retlen> is set (if C<retlen> isn't
1836NULL) to -1. If those warnings are off, the computed value if well-defined (or
1837the Unicode REPLACEMENT CHARACTER, if not) is silently returned, and C<*retlen>
1838is set (if C<retlen> isn't NULL) so that (S<C<s> + C<*retlen>>) is the
1839next possible position in C<s> that could begin a non-malformed character.
de69f3af 1840See L</utf8n_to_uvchr> for details on when the REPLACEMENT CHARACTER is returned.
ec5f19d0 1841
760c7c2f
KW
1842Code points above the platform's C<IV_MAX> will raise a deprecation warning,
1843unless those are turned off.
1844
ec5f19d0
KW
1845=cut
1846*/
1847
1848UV
1849Perl_utf8_to_uvuni_buf(pTHX_ const U8 *s, const U8 *send, STRLEN *retlen)
1850{
1851 PERL_ARGS_ASSERT_UTF8_TO_UVUNI_BUF;
1852
1853 assert(send > s);
1854
5962d97e
KW
1855 /* Call the low level routine, asking for checks */
1856 return NATIVE_TO_UNI(utf8_to_uvchr_buf(s, send, retlen));
ec5f19d0
KW
1857}
1858
b76347f2 1859/*
87cea99e 1860=for apidoc utf8_length
b76347f2
JH
1861
1862Return the length of the UTF-8 char encoded string C<s> in characters.
02eb7b47
JH
1863Stops at C<e> (inclusive). If C<e E<lt> s> or if the scan would end
1864up past C<e>, croaks.
b76347f2
JH
1865
1866=cut
1867*/
1868
1869STRLEN
35a4481c 1870Perl_utf8_length(pTHX_ const U8 *s, const U8 *e)
b76347f2
JH
1871{
1872 STRLEN len = 0;
1873
7918f24d
NC
1874 PERL_ARGS_ASSERT_UTF8_LENGTH;
1875
8850bf83
JH
1876 /* Note: cannot use UTF8_IS_...() too eagerly here since e.g.
1877 * the bitops (especially ~) can create illegal UTF-8.
1878 * In other words: in Perl UTF-8 is not just for Unicode. */
1879
a3b680e6
AL
1880 if (e < s)
1881 goto warn_and_return;
b76347f2 1882 while (s < e) {
4cbf4130 1883 s += UTF8SKIP(s);
8e91ec7f
AV
1884 len++;
1885 }
1886
1887 if (e != s) {
1888 len--;
1889 warn_and_return:
9b387841
NC
1890 if (PL_op)
1891 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
1892 "%s in %s", unees, OP_DESC(PL_op));
1893 else
61a12c31 1894 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "%s", unees);
b76347f2
JH
1895 }
1896
1897 return len;
1898}
1899
b06226ff 1900/*
fed3ba5d
NC
1901=for apidoc bytes_cmp_utf8
1902
a1433954 1903Compares the sequence of characters (stored as octets) in C<b>, C<blen> with the
72d33970
FC
1904sequence of characters (stored as UTF-8)
1905in C<u>, C<ulen>. Returns 0 if they are
fed3ba5d
NC
1906equal, -1 or -2 if the first string is less than the second string, +1 or +2
1907if the first string is greater than the second string.
1908
1909-1 or +1 is returned if the shorter string was identical to the start of the
72d33970
FC
1910longer string. -2 or +2 is returned if
1911there was a difference between characters
fed3ba5d
NC
1912within the strings.
1913
1914=cut
1915*/
1916
1917int
1918Perl_bytes_cmp_utf8(pTHX_ const U8 *b, STRLEN blen, const U8 *u, STRLEN ulen)
1919{
1920 const U8 *const bend = b + blen;
1921 const U8 *const uend = u + ulen;
1922
1923 PERL_ARGS_ASSERT_BYTES_CMP_UTF8;
fed3ba5d
NC
1924
1925 while (b < bend && u < uend) {
1926 U8 c = *u++;
1927 if (!UTF8_IS_INVARIANT(c)) {
1928 if (UTF8_IS_DOWNGRADEABLE_START(c)) {
1929 if (u < uend) {
1930 U8 c1 = *u++;
1931 if (UTF8_IS_CONTINUATION(c1)) {
a62b247b 1932 c = EIGHT_BIT_UTF8_TO_NATIVE(c, c1);
fed3ba5d 1933 } else {
2b5e7bc2 1934 /* diag_listed_as: Malformed UTF-8 character%s */
fed3ba5d 1935 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
56576a04
KW
1936 "%s %s%s",
1937 unexpected_non_continuation_text(u - 2, 2, 1, 2),
1938 PL_op ? " in " : "",
1939 PL_op ? OP_DESC(PL_op) : "");
fed3ba5d
NC
1940 return -2;
1941 }
1942 } else {
1943 if (PL_op)
1944 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
1945 "%s in %s", unees, OP_DESC(PL_op));
1946 else
61a12c31 1947 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "%s", unees);
fed3ba5d
NC
1948 return -2; /* Really want to return undef :-) */
1949 }
1950 } else {
1951 return -2;
1952 }
1953 }
1954 if (*b != c) {
1955 return *b < c ? -2 : +2;
1956 }
1957 ++b;
1958 }
1959
1960 if (b == bend && u == uend)
1961 return 0;
1962
1963 return b < bend ? +1 : -1;
1964}
1965
1966/*
87cea99e 1967=for apidoc utf8_to_bytes
6940069f 1968
3bc0c78c 1969Converts a string C<"s"> of length C<*lenp> from UTF-8 into native byte encoding.
a1433954 1970Unlike L</bytes_to_utf8>, this over-writes the original string, and
09af0336 1971updates C<*lenp> to contain the new length.
3bc0c78c
KW
1972Returns zero on failure (leaving C<"s"> unchanged) setting C<*lenp> to -1.
1973
1974Upon successful return, the number of variants in the string can be computed by
23b37b12
KW
1975having saved the value of C<*lenp> before the call, and subtracting the
1976after-call value of C<*lenp> from it.
6940069f 1977
a1433954 1978If you need a copy of the string, see L</bytes_from_utf8>.
95be277c 1979
6940069f
GS
1980=cut
1981*/
1982
1983U8 *
09af0336 1984Perl_utf8_to_bytes(pTHX_ U8 *s, STRLEN *lenp)
6940069f 1985{
9fe0d3c2 1986 U8 * first_variant;
246fae53 1987
7918f24d 1988 PERL_ARGS_ASSERT_UTF8_TO_BYTES;
81611534 1989 PERL_UNUSED_CONTEXT;
7918f24d 1990
9fe0d3c2 1991 /* This is a no-op if no variants at all in the input */
09af0336 1992 if (is_utf8_invariant_string_loc(s, *lenp, (const U8 **) &first_variant)) {
9fe0d3c2
KW
1993 return s;
1994 }
1995
1996 {
3c5aa262 1997 U8 * const save = s;
09af0336 1998 U8 * const send = s + *lenp;
3c5aa262
KW
1999 U8 * d;
2000
2001 /* Nothing before the first variant needs to be changed, so start the real
2002 * work there */
2003 s = first_variant;
2004 while (s < send) {
2005 if (! UTF8_IS_INVARIANT(*s)) {
2006 if (! UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, send)) {
09af0336 2007 *lenp = ((STRLEN) -1);
3c5aa262
KW
2008 return 0;
2009 }
2010 s++;
d59937ca
KW
2011 }
2012 s++;
dcad2880 2013 }
dcad2880 2014
3c5aa262
KW
2015 /* Is downgradable, so do it */
2016 d = s = first_variant;
2017 while (s < send) {
2018 U8 c = *s++;
2019 if (! UVCHR_IS_INVARIANT(c)) {
2020 /* Then it is two-byte encoded */
2021 c = EIGHT_BIT_UTF8_TO_NATIVE(c, *s);
2022 s++;
2023 }
2024 *d++ = c;
2025 }
2026 *d = '\0';
09af0336 2027 *lenp = d - save;
3c5aa262
KW
2028
2029 return save;
9fe0d3c2 2030 }
6940069f
GS
2031}
2032
2033/*
87cea99e 2034=for apidoc bytes_from_utf8
f9a63242 2035
09af0336 2036Converts a potentially UTF-8 encoded string C<s> of length C<*lenp> into native
41ae6089 2037byte encoding. On input, the boolean C<*is_utf8p> gives whether or not C<s> is
4f3d592d
KW
2038actually encoded in UTF-8.
2039
2040Unlike L</utf8_to_bytes> but like L</bytes_to_utf8>, this is non-destructive of
2041the input string.
2042
41ae6089
KW
2043Do nothing if C<*is_utf8p> is 0, or if there are code points in the string
2044not expressible in native byte encoding. In these cases, C<*is_utf8p> and
09af0336 2045C<*lenp> are unchanged, and the return value is the original C<s>.
4f3d592d 2046
41ae6089 2047Otherwise, C<*is_utf8p> is set to 0, and the return value is a pointer to a
4f3d592d 2048newly created string containing a downgraded copy of C<s>, and whose length is
23b37b12 2049returned in C<*lenp>, updated. The new string is C<NUL>-terminated.
f9a63242 2050
3bc0c78c 2051Upon successful return, the number of variants in the string can be computed by
23b37b12
KW
2052having saved the value of C<*lenp> before the call, and subtracting the
2053after-call value of C<*lenp> from it.
3bc0c78c 2054
37607a96 2055=cut
976c1b08
KW
2056
2057There is a macro that avoids this function call, but this is retained for
2058anyone who calls it with the Perl_ prefix */
f9a63242
JH
2059
2060U8 *
41ae6089 2061Perl_bytes_from_utf8(pTHX_ const U8 *s, STRLEN *lenp, bool *is_utf8p)
f9a63242 2062{
7918f24d 2063 PERL_ARGS_ASSERT_BYTES_FROM_UTF8;
96a5add6 2064 PERL_UNUSED_CONTEXT;
f9a63242 2065
976c1b08
KW
2066 return bytes_from_utf8_loc(s, lenp, is_utf8p, NULL);
2067}
2068
2069/*
2070No = here because currently externally undocumented
2071for apidoc bytes_from_utf8_loc
2072
2073Like C<L</bytes_from_utf8>()>, but takes an extra parameter, a pointer to where
2074to store the location of the first character in C<"s"> that cannot be
2075converted to non-UTF8.
2076
2077If that parameter is C<NULL>, this function behaves identically to
2078C<bytes_from_utf8>.
2079
2080Otherwise if C<*is_utf8p> is 0 on input, the function behaves identically to
2081C<bytes_from_utf8>, except it also sets C<*first_non_downgradable> to C<NULL>.
2082
2083Otherwise, the function returns a newly created C<NUL>-terminated string
2084containing the non-UTF8 equivalent of the convertible first portion of
2085C<"s">. C<*lenp> is set to its length, not including the terminating C<NUL>.
2086If the entire input string was converted, C<*is_utf8p> is set to a FALSE value,
2087and C<*first_non_downgradable> is set to C<NULL>.
2088
2089Otherwise, C<*first_non_downgradable> set to point to the first byte of the
2090first character in the original string that wasn't converted. C<*is_utf8p> is
2091unchanged. Note that the new string may have length 0.
2092
2093Another way to look at it is, if C<*first_non_downgradable> is non-C<NULL> and
2094C<*is_utf8p> is TRUE, this function starts at the beginning of C<"s"> and
2095converts as many characters in it as possible stopping at the first one it
385b74be 2096finds that can't be converted to non-UTF-8. C<*first_non_downgradable> is
976c1b08
KW
2097set to point to that. The function returns the portion that could be converted
2098in a newly created C<NUL>-terminated string, and C<*lenp> is set to its length,
2099not including the terminating C<NUL>. If the very first character in the
2100original could not be converted, C<*lenp> will be 0, and the new string will
2101contain just a single C<NUL>. If the entire input string was converted,
2102C<*is_utf8p> is set to FALSE and C<*first_non_downgradable> is set to C<NULL>.
2103
2104Upon successful return, the number of variants in the converted portion of the
2105string can be computed by having saved the value of C<*lenp> before the call,
2106and subtracting the after-call value of C<*lenp> from it.
2107
2108=cut
2109
2110
2111*/
2112
2113U8 *
2114Perl_bytes_from_utf8_loc(const U8 *s, STRLEN *lenp, bool *is_utf8p, const U8** first_unconverted)
2115{
2116 U8 *d;
2117 const U8 *original = s;
2118 U8 *converted_start;
2119 const U8 *send = s + *lenp;
f9a63242 2120
976c1b08 2121 PERL_ARGS_ASSERT_BYTES_FROM_UTF8_LOC;
170a1c22 2122
976c1b08
KW
2123 if (! *is_utf8p) {
2124 if (first_unconverted) {
2125 *first_unconverted = NULL;
2126 }
2127
2128 return (U8 *) original;
2129 }
2130
2131 Newx(d, (*lenp) + 1, U8);
2132
2133 converted_start = d;
7299a045
KW
2134 while (s < send) {
2135 U8 c = *s++;
2136 if (! UTF8_IS_INVARIANT(c)) {
976c1b08
KW
2137
2138 /* Then it is multi-byte encoded. If the code point is above 0xFF,
2139 * have to stop now */
2140 if (UNLIKELY (! UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s - 1, send))) {
2141 if (first_unconverted) {
2142 *first_unconverted = s - 1;
2143 goto finish_and_return;
2144 }
2145 else {
2146 Safefree(converted_start);
2147 return (U8 *) original;
2148 }
2149 }
2150
7299a045
KW
2151 c = EIGHT_BIT_UTF8_TO_NATIVE(c, *s);
2152 s++;
38af28cf 2153 }
7299a045
KW
2154 *d++ = c;
2155 }
170a1c22 2156
976c1b08
KW
2157 /* Here, converted the whole of the input */
2158 *is_utf8p = FALSE;
2159 if (first_unconverted) {
2160 *first_unconverted = NULL;
170a1c22 2161 }
976c1b08
KW
2162
2163 finish_and_return:
2164 *d = '\0';
2165 *lenp = d - converted_start;
2166
2167 /* Trim unused space */
2168 Renew(converted_start, *lenp + 1, U8);
2169
2170 return converted_start;
f9a63242
JH
2171}
2172
2173/*
87cea99e 2174=for apidoc bytes_to_utf8
6940069f 2175
09af0336 2176Converts a string C<s> of length C<*lenp> bytes from the native encoding into
ff97e5cf 2177UTF-8.
09af0336 2178Returns a pointer to the newly-created string, and sets C<*lenp> to
ff97e5cf 2179reflect the new length in bytes.
6940069f 2180
3bc0c78c 2181Upon successful return, the number of variants in the string can be computed by
23b37b12 2182having saved the value of C<*lenp> before the call, and subtracting it from the
3bc0c78c
KW
2183after-call value of C<*lenp>.
2184
75200dff 2185A C<NUL> character will be written after the end of the string.
2bbc8d55
SP
2186
2187If you want to convert to UTF-8 from encodings other than
2188the native (Latin1 or EBCDIC),
a1433954 2189see L</sv_recode_to_utf8>().
c9ada85f 2190
497711e7 2191=cut
6940069f
GS
2192*/
2193
2194U8*
09af0336 2195Perl_bytes_to_utf8(pTHX_ const U8 *s, STRLEN *lenp)
6940069f 2196{
09af0336 2197 const U8 * const send = s + (*lenp);
6940069f
GS
2198 U8 *d;
2199 U8 *dst;
7918f24d
NC
2200
2201 PERL_ARGS_ASSERT_BYTES_TO_UTF8;
96a5add6 2202 PERL_UNUSED_CONTEXT;
6940069f 2203
09af0336 2204 Newx(d, (*lenp) * 2 + 1, U8);
6940069f
GS
2205 dst = d;
2206
2207 while (s < send) {
55d09dc8
KW
2208 append_utf8_from_native_byte(*s, &d);
2209 s++;
6940069f
GS
2210 }
2211 *d = '\0';
09af0336 2212 *lenp = d-dst;
6940069f
GS
2213 return dst;
2214}
2215
a0ed51b3 2216/*
dea0fc0b 2217 * Convert native (big-endian) or reversed (little-endian) UTF-16 to UTF-8.
a0ed51b3
LW
2218 *
2219 * Destination must be pre-extended to 3/2 source. Do not use in-place.
2220 * We optimize for native, for obvious reasons. */
2221
2222U8*
dea0fc0b 2223Perl_utf16_to_utf8(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
a0ed51b3 2224{
dea0fc0b
JH
2225 U8* pend;
2226 U8* dstart = d;
2227
7918f24d
NC
2228 PERL_ARGS_ASSERT_UTF16_TO_UTF8;
2229
dea0fc0b 2230 if (bytelen & 1)
56576a04
KW
2231 Perl_croak(aTHX_ "panic: utf16_to_utf8: odd bytelen %" UVuf,
2232 (UV)bytelen);
dea0fc0b
JH
2233
2234 pend = p + bytelen;
2235
a0ed51b3 2236 while (p < pend) {
dea0fc0b
JH
2237 UV uv = (p[0] << 8) + p[1]; /* UTF-16BE */
2238 p += 2;
2d1545e5 2239 if (OFFUNI_IS_INVARIANT(uv)) {
56d37426 2240 *d++ = LATIN1_TO_NATIVE((U8) uv);
a0ed51b3
LW
2241 continue;
2242 }
56d37426
KW
2243 if (uv <= MAX_UTF8_TWO_BYTE) {
2244 *d++ = UTF8_TWO_BYTE_HI(UNI_TO_NATIVE(uv));
2245 *d++ = UTF8_TWO_BYTE_LO(UNI_TO_NATIVE(uv));
a0ed51b3
LW
2246 continue;
2247 }
46956fad
KW
2248#define FIRST_HIGH_SURROGATE UNICODE_SURROGATE_FIRST
2249#define LAST_HIGH_SURROGATE 0xDBFF
2250#define FIRST_LOW_SURROGATE 0xDC00
2251#define LAST_LOW_SURROGATE UNICODE_SURROGATE_LAST
e23c50db
KW
2252
2253 /* This assumes that most uses will be in the first Unicode plane, not
2254 * needing surrogates */
2255 if (UNLIKELY(uv >= UNICODE_SURROGATE_FIRST
2256 && uv <= UNICODE_SURROGATE_LAST))
2257 {
2258 if (UNLIKELY(p >= pend) || UNLIKELY(uv > LAST_HIGH_SURROGATE)) {
2259 Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
2260 }
2261 else {
01ea242b 2262 UV low = (p[0] << 8) + p[1];
e23c50db
KW
2263 if ( UNLIKELY(low < FIRST_LOW_SURROGATE)
2264 || UNLIKELY(low > LAST_LOW_SURROGATE))
2265 {
01ea242b 2266 Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
e23c50db
KW
2267 }
2268 p += 2;
46956fad
KW
2269 uv = ((uv - FIRST_HIGH_SURROGATE) << 10)
2270 + (low - FIRST_LOW_SURROGATE) + 0x10000;
01ea242b 2271 }
a0ed51b3 2272 }
56d37426
KW
2273#ifdef EBCDIC
2274 d = uvoffuni_to_utf8_flags(d, uv, 0);
2275#else
a0ed51b3 2276 if (uv < 0x10000) {
eb160463
GS
2277 *d++ = (U8)(( uv >> 12) | 0xe0);
2278 *d++ = (U8)(((uv >> 6) & 0x3f) | 0x80);
2279 *d++ = (U8)(( uv & 0x3f) | 0x80);
a0ed51b3
LW
2280 continue;
2281 }
2282 else {
eb160463
GS
2283 *d++ = (U8)(( uv >> 18) | 0xf0);
2284 *d++ = (U8)(((uv >> 12) & 0x3f) | 0x80);
2285 *d++ = (U8)(((uv >> 6) & 0x3f) | 0x80);
2286 *d++ = (U8)(( uv & 0x3f) | 0x80);
a0ed51b3
LW
2287 continue;
2288 }
56d37426 2289#endif
a0ed51b3 2290 }
dea0fc0b 2291 *newlen = d - dstart;
a0ed51b3
LW
2292 return d;
2293}
2294
2295/* Note: this one is slightly destructive of the source. */
2296
2297U8*
dea0fc0b 2298Perl_utf16_to_utf8_reversed(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
a0ed51b3
LW
2299{
2300 U8* s = (U8*)p;
d4c19fe8 2301 U8* const send = s + bytelen;
7918f24d
NC
2302
2303 PERL_ARGS_ASSERT_UTF16_TO_UTF8_REVERSED;
2304
e0ea5e2d 2305 if (bytelen & 1)
147e3846 2306 Perl_croak(aTHX_ "panic: utf16_to_utf8_reversed: odd bytelen %" UVuf,
e0ea5e2d
NC
2307 (UV)bytelen);
2308
a0ed51b3 2309 while (s < send) {
d4c19fe8 2310 const U8 tmp = s[0];
a0ed51b3
LW
2311 s[0] = s[1];
2312 s[1] = tmp;
2313 s += 2;
2314 }
dea0fc0b 2315 return utf16_to_utf8(p, d, bytelen, newlen);
a0ed51b3
LW
2316}
2317
922e8cb4
KW
2318bool
2319Perl__is_uni_FOO(pTHX_ const U8 classnum, const UV c)
2320{
2321 U8 tmpbuf[UTF8_MAXBYTES+1];
2322 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2323 return _is_utf8_FOO_with_len(classnum, tmpbuf, tmpbuf + sizeof(tmpbuf));
922e8cb4
KW
2324}
2325
f9ae8fb6
JD
2326/* Internal function so we can deprecate the external one, and call
2327 this one from other deprecated functions in this file */
2328
f2645549
KW
2329bool
2330Perl__is_utf8_idstart(pTHX_ const U8 *p)
61b19385 2331{
f2645549 2332 PERL_ARGS_ASSERT__IS_UTF8_IDSTART;
61b19385
KW
2333
2334 if (*p == '_')
2335 return TRUE;
f25ce844 2336 return is_utf8_common(p, &PL_utf8_idstart, "IdStart", NULL);
61b19385
KW
2337}
2338
5092f92a 2339bool
eba68aa0
KW
2340Perl__is_uni_perl_idcont(pTHX_ UV c)
2341{
2342 U8 tmpbuf[UTF8_MAXBYTES+1];
2343 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2344 return _is_utf8_perl_idcont_with_len(tmpbuf, tmpbuf + sizeof(tmpbuf));
eba68aa0
KW
2345}
2346
2347bool
f91dcd13
KW
2348Perl__is_uni_perl_idstart(pTHX_ UV c)
2349{
2350 U8 tmpbuf[UTF8_MAXBYTES+1];
2351 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2352 return _is_utf8_perl_idstart_with_len(tmpbuf, tmpbuf + sizeof(tmpbuf));
f91dcd13
KW
2353}
2354
3a4c58c9 2355UV
56576a04
KW
2356Perl__to_upper_title_latin1(pTHX_ const U8 c, U8* p, STRLEN *lenp,
2357 const char S_or_s)
3a4c58c9
KW
2358{
2359 /* We have the latin1-range values compiled into the core, so just use
4a4088c4 2360 * those, converting the result to UTF-8. The only difference between upper
3a4c58c9
KW
2361 * and title case in this range is that LATIN_SMALL_LETTER_SHARP_S is
2362 * either "SS" or "Ss". Which one to use is passed into the routine in
2363 * 'S_or_s' to avoid a test */
2364
2365 UV converted = toUPPER_LATIN1_MOD(c);
2366
2367 PERL_ARGS_ASSERT__TO_UPPER_TITLE_LATIN1;
2368
2369 assert(S_or_s == 'S' || S_or_s == 's');
2370
6f2d5cbc 2371 if (UVCHR_IS_INVARIANT(converted)) { /* No difference between the two for
f4cd282c 2372 characters in this range */
3a4c58c9
KW
2373 *p = (U8) converted;
2374 *lenp = 1;
2375 return converted;
2376 }
2377
2378 /* toUPPER_LATIN1_MOD gives the correct results except for three outliers,
2379 * which it maps to one of them, so as to only have to have one check for
2380 * it in the main case */
2381 if (UNLIKELY(converted == LATIN_SMALL_LETTER_Y_WITH_DIAERESIS)) {
2382 switch (c) {
2383 case LATIN_SMALL_LETTER_Y_WITH_DIAERESIS:
2384 converted = LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS;
2385 break;
2386 case MICRO_SIGN:
2387 converted = GREEK_CAPITAL_LETTER_MU;
2388 break;
79e064b9
KW
2389#if UNICODE_MAJOR_VERSION > 2 \
2390 || (UNICODE_MAJOR_VERSION == 2 && UNICODE_DOT_VERSION >= 1 \
2391 && UNICODE_DOT_DOT_VERSION >= 8)
3a4c58c9
KW
2392 case LATIN_SMALL_LETTER_SHARP_S:
2393 *(p)++ = 'S';
2394 *p = S_or_s;
2395 *lenp = 2;
2396 return 'S';
79e064b9 2397#endif
3a4c58c9 2398 default:
56576a04
KW
2399 Perl_croak(aTHX_ "panic: to_upper_title_latin1 did not expect"
2400 " '%c' to map to '%c'",
2401 c, LATIN_SMALL_LETTER_Y_WITH_DIAERESIS);
e5964223 2402 NOT_REACHED; /* NOTREACHED */
3a4c58c9
KW
2403 }
2404 }
2405
2406 *(p)++ = UTF8_TWO_BYTE_HI(converted);
2407 *p = UTF8_TWO_BYTE_LO(converted);
2408 *lenp = 2;
2409
2410 return converted;
2411}
2412
50bda2c3
KW
2413/* Call the function to convert a UTF-8 encoded character to the specified case.
2414 * Note that there may be more than one character in the result.
2415 * INP is a pointer to the first byte of the input character
2416 * OUTP will be set to the first byte of the string of changed characters. It
2417 * needs to have space for UTF8_MAXBYTES_CASE+1 bytes
2418 * LENP will be set to the length in bytes of the string of changed characters
2419 *
56576a04
KW
2420 * The functions return the ordinal of the first character in the string of
2421 * OUTP */
2422#define CALL_UPPER_CASE(uv, s, d, lenp) \
2423 _to_utf8_case(uv, s, d, lenp, &PL_utf8_toupper, "ToUc", "")
2424#define CALL_TITLE_CASE(uv, s, d, lenp) \
2425 _to_utf8_case(uv, s, d, lenp, &PL_utf8_totitle, "ToTc", "")
2426#define CALL_LOWER_CASE(uv, s, d, lenp) \
2427 _to_utf8_case(uv, s, d, lenp, &PL_utf8_tolower, "ToLc", "")
50bda2c3 2428
b9992569
KW
2429/* This additionally has the input parameter 'specials', which if non-zero will
2430 * cause this to use the specials hash for folding (meaning get full case
50bda2c3 2431 * folding); otherwise, when zero, this implies a simple case fold */
56576a04
KW
2432#define CALL_FOLD_CASE(uv, s, d, lenp, specials) \
2433_to_utf8_case(uv, s, d, lenp, &PL_utf8_tofold, "ToCf", (specials) ? "" : NULL)
c3fd2246 2434
84afefe6
JH
2435UV
2436Perl_to_uni_upper(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2437{
a1433954
KW
2438 /* Convert the Unicode character whose ordinal is <c> to its uppercase
2439 * version and store that in UTF-8 in <p> and its length in bytes in <lenp>.
2440 * Note that the <p> needs to be at least UTF8_MAXBYTES_CASE+1 bytes since
c3fd2246
KW
2441 * the changed version may be longer than the original character.
2442 *
2443 * The ordinal of the first character of the changed version is returned
2444 * (but note, as explained above, that there may be more.) */
2445
7918f24d
NC
2446 PERL_ARGS_ASSERT_TO_UNI_UPPER;
2447
3a4c58c9
KW
2448 if (c < 256) {
2449 return _to_upper_title_latin1((U8) c, p, lenp, 'S');
2450 }
2451
0ebc6274 2452 uvchr_to_utf8(p, c);
b9992569 2453 return CALL_UPPER_CASE(c, p, p, lenp);
a0ed51b3
LW
2454}
2455
84afefe6
JH
2456UV
2457Perl_to_uni_title(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2458{
7918f24d
NC
2459 PERL_ARGS_ASSERT_TO_UNI_TITLE;
2460
3a4c58c9
KW
2461 if (c < 256) {
2462 return _to_upper_title_latin1((U8) c, p, lenp, 's');
2463 }
2464
0ebc6274 2465 uvchr_to_utf8(p, c);
b9992569 2466 return CALL_TITLE_CASE(c, p, p, lenp);
a0ed51b3
LW
2467}
2468
afc16117 2469STATIC U8
eaf412bf 2470S_to_lower_latin1(const U8 c, U8* p, STRLEN *lenp, const char dummy)
afc16117
KW
2471{
2472 /* We have the latin1-range values compiled into the core, so just use
4a4088c4 2473 * those, converting the result to UTF-8. Since the result is always just
a1433954 2474 * one character, we allow <p> to be NULL */
afc16117
KW
2475
2476 U8 converted = toLOWER_LATIN1(c);
2477
eaf412bf
KW
2478 PERL_UNUSED_ARG(dummy);
2479
afc16117 2480 if (p != NULL) {
6f2d5cbc 2481 if (NATIVE_BYTE_IS_INVARIANT(converted)) {
afc16117
KW
2482 *p = converted;
2483 *lenp = 1;
2484 }
2485 else {
430c9760
KW
2486 /* Result is known to always be < 256, so can use the EIGHT_BIT
2487 * macros */
2488 *p = UTF8_EIGHT_BIT_HI(converted);
2489 *(p+1) = UTF8_EIGHT_BIT_LO(converted);
afc16117
KW
2490 *lenp = 2;
2491 }
2492 }
2493 return converted;
2494}
2495
84afefe6
JH
2496UV
2497Perl_to_uni_lower(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2498{
7918f24d
NC
2499 PERL_ARGS_ASSERT_TO_UNI_LOWER;
2500
afc16117 2501 if (c < 256) {
eaf412bf 2502 return to_lower_latin1((U8) c, p, lenp, 0 /* 0 is a dummy arg */ );
bca00c02
KW
2503 }
2504
afc16117 2505 uvchr_to_utf8(p, c);
b9992569 2506 return CALL_LOWER_CASE(c, p, p, lenp);
a0ed51b3
LW
2507}
2508
84afefe6 2509UV
56576a04
KW
2510Perl__to_fold_latin1(pTHX_ const U8 c, U8* p, STRLEN *lenp,
2511 const unsigned int flags)
a1dde8de 2512{
51910141 2513 /* Corresponds to to_lower_latin1(); <flags> bits meanings:
1ca267a5 2514 * FOLD_FLAGS_NOMIX_ASCII iff non-ASCII to ASCII folds are prohibited
51910141 2515 * FOLD_FLAGS_FULL iff full folding is to be used;
1ca267a5
KW
2516 *
2517 * Not to be used for locale folds
51910141 2518 */
f673fad4 2519
a1dde8de
KW
2520 UV converted;
2521
2522 PERL_ARGS_ASSERT__TO_FOLD_LATIN1;
81611534 2523 PERL_UNUSED_CONTEXT;
a1dde8de 2524
1ca267a5
KW
2525 assert (! (flags & FOLD_FLAGS_LOCALE));
2526
659a7c2d 2527 if (UNLIKELY(c == MICRO_SIGN)) {
a1dde8de
KW
2528 converted = GREEK_SMALL_LETTER_MU;
2529 }
9b63e895
KW
2530#if UNICODE_MAJOR_VERSION > 3 /* no multifolds in early Unicode */ \
2531 || (UNICODE_MAJOR_VERSION == 3 && ( UNICODE_DOT_VERSION > 0) \
2532 || UNICODE_DOT_DOT_VERSION > 0)
659a7c2d
KW
2533 else if ( (flags & FOLD_FLAGS_FULL)
2534 && UNLIKELY(c == LATIN_SMALL_LETTER_SHARP_S))
2535 {
1ca267a5
KW
2536 /* If can't cross 127/128 boundary, can't return "ss"; instead return
2537 * two U+017F characters, as fc("\df") should eq fc("\x{17f}\x{17f}")
2538 * under those circumstances. */
2539 if (flags & FOLD_FLAGS_NOMIX_ASCII) {
2540 *lenp = 2 * sizeof(LATIN_SMALL_LETTER_LONG_S_UTF8) - 2;
2541 Copy(LATIN_SMALL_LETTER_LONG_S_UTF8 LATIN_SMALL_LETTER_LONG_S_UTF8,
2542 p, *lenp, U8);
2543 return LATIN_SMALL_LETTER_LONG_S;
2544 }
2545 else {
4f489194
KW
2546 *(p)++ = 's';
2547 *p = 's';
2548 *lenp = 2;
2549 return 's';
1ca267a5 2550 }
a1dde8de 2551 }
9b63e895 2552#endif
a1dde8de
KW
2553 else { /* In this range the fold of all other characters is their lower
2554 case */
2555 converted = toLOWER_LATIN1(c);
2556 }
2557
6f2d5cbc 2558 if (UVCHR_IS_INVARIANT(converted)) {
a1dde8de
KW
2559 *p = (U8) converted;
2560 *lenp = 1;
2561 }
2562 else {
2563 *(p)++ = UTF8_TWO_BYTE_HI(converted);
2564 *p = UTF8_TWO_BYTE_LO(converted);
2565 *lenp = 2;
2566 }
2567
2568 return converted;
2569}
2570
2571UV
31f05a37 2572Perl__to_uni_fold_flags(pTHX_ UV c, U8* p, STRLEN *lenp, U8 flags)
84afefe6 2573{
4b593389 2574
a0270393
KW
2575 /* Not currently externally documented, and subject to change
2576 * <flags> bits meanings:
2577 * FOLD_FLAGS_FULL iff full folding is to be used;
31f05a37
KW
2578 * FOLD_FLAGS_LOCALE is set iff the rules from the current underlying
2579 * locale are to be used.
a0270393
KW
2580 * FOLD_FLAGS_NOMIX_ASCII iff non-ASCII to ASCII folds are prohibited
2581 */
4b593389 2582
36bb2ab6 2583 PERL_ARGS_ASSERT__TO_UNI_FOLD_FLAGS;
7918f24d 2584
780fcc9f
KW
2585 if (flags & FOLD_FLAGS_LOCALE) {
2586 /* Treat a UTF-8 locale as not being in locale at all */
2587 if (IN_UTF8_CTYPE_LOCALE) {
2588 flags &= ~FOLD_FLAGS_LOCALE;
2589 }
2590 else {
2591 _CHECK_AND_WARN_PROBLEMATIC_LOCALE;
e7b7ac46 2592 goto needs_full_generality;
780fcc9f 2593 }
31f05a37
KW
2594 }
2595
a1dde8de 2596 if (c < 256) {
e7b7ac46 2597 return _to_fold_latin1((U8) c, p, lenp,
31f05a37 2598 flags & (FOLD_FLAGS_FULL | FOLD_FLAGS_NOMIX_ASCII));
a1dde8de
KW
2599 }
2600
2f306ab9 2601 /* Here, above 255. If no special needs, just use the macro */
a0270393
KW
2602 if ( ! (flags & (FOLD_FLAGS_LOCALE|FOLD_FLAGS_NOMIX_ASCII))) {
2603 uvchr_to_utf8(p, c);
b9992569 2604 return CALL_FOLD_CASE(c, p, p, lenp, flags & FOLD_FLAGS_FULL);
a0270393 2605 }
567b353c 2606 else { /* Otherwise, _toFOLD_utf8_flags has the intelligence to deal with
a0270393
KW
2607 the special flags. */
2608 U8 utf8_c[UTF8_MAXBYTES + 1];
e7b7ac46
KW
2609
2610 needs_full_generality:
a0270393 2611 uvchr_to_utf8(utf8_c, c);
56576a04
KW
2612 return _toFOLD_utf8_flags(utf8_c, utf8_c + sizeof(utf8_c),
2613 p, lenp, flags);
a0270393 2614 }
84afefe6
JH
2615}
2616
26483009 2617PERL_STATIC_INLINE bool
5141f98e 2618S_is_utf8_common(pTHX_ const U8 *const p, SV **swash,
f25ce844 2619 const char *const swashname, SV* const invlist)
bde6a22d 2620{
ea317ccb
KW
2621 /* returns a boolean giving whether or not the UTF8-encoded character that
2622 * starts at <p> is in the swash indicated by <swashname>. <swash>
2623 * contains a pointer to where the swash indicated by <swashname>
2624 * is to be stored; which this routine will do, so that future calls will
f25ce844
KW
2625 * look at <*swash> and only generate a swash if it is not null. <invlist>
2626 * is NULL or an inversion list that defines the swash. If not null, it
2627 * saves time during initialization of the swash.
ea317ccb
KW
2628 *
2629 * Note that it is assumed that the buffer length of <p> is enough to
2630 * contain all the bytes that comprise the character. Thus, <*p> should
2631 * have been checked before this call for mal-formedness enough to assure
2632 * that. */
2633
7918f24d
NC
2634 PERL_ARGS_ASSERT_IS_UTF8_COMMON;
2635
492a624f 2636 /* The API should have included a length for the UTF-8 character in <p>,
28123549 2637 * but it doesn't. We therefore assume that p has been validated at least
492a624f
KW
2638 * as far as there being enough bytes available in it to accommodate the
2639 * character without reading beyond the end, and pass that number on to the
2640 * validating routine */
6302f837 2641 if (! isUTF8_CHAR(p, p + UTF8SKIP(p))) {
86ae6e94 2642 _force_out_malformed_utf8_message(p, p + UTF8SKIP(p),
99a765e9 2643 _UTF8_NO_CONFIDENCE_IN_CURLEN,
86ae6e94
KW
2644 1 /* Die */ );
2645 NOT_REACHED; /* NOTREACHED */
28123549 2646 }
86ae6e94 2647
87367d5f
KW
2648 if (!*swash) {
2649 U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
f25ce844
KW
2650 *swash = _core_swash_init("utf8",
2651
2652 /* Only use the name if there is no inversion
2653 * list; otherwise will go out to disk */
2654 (invlist) ? "" : swashname,
2655
2656 &PL_sv_undef, 1, 0, invlist, &flags);
87367d5f 2657 }
28123549 2658
bde6a22d
NC
2659 return swash_fetch(*swash, p, TRUE) != 0;
2660}
2661
da8c1a98 2662PERL_STATIC_INLINE bool
56576a04
KW
2663S_is_utf8_common_with_len(pTHX_ const U8 *const p, const U8 * const e,
2664 SV **swash, const char *const swashname,
2665 SV* const invlist)
da8c1a98
KW
2666{
2667 /* returns a boolean giving whether or not the UTF8-encoded character that
2668 * starts at <p>, and extending no further than <e - 1> is in the swash
2669 * indicated by <swashname>. <swash> contains a pointer to where the swash
2670 * indicated by <swashname> is to be stored; which this routine will do, so
2671 * that future calls will look at <*swash> and only generate a swash if it
2672 * is not null. <invlist> is NULL or an inversion list that defines the
2673 * swash. If not null, it saves time during initialization of the swash.
2674 */
2675
2676 PERL_ARGS_ASSERT_IS_UTF8_COMMON_WITH_LEN;
2677
2678 if (! isUTF8_CHAR(p, e)) {
2679 _force_out_malformed_utf8_message(p, e, 0, 1);
2680 NOT_REACHED; /* NOTREACHED */
2681 }
2682
2683 if (!*swash) {
2684 U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
2685 *swash = _core_swash_init("utf8",
2686
2687 /* Only use the name if there is no inversion
2688 * list; otherwise will go out to disk */
2689 (invlist) ? "" : swashname,
2690
2691 &PL_sv_undef, 1, 0, invlist, &flags);
2692 }
2693
2694 return swash_fetch(*swash, p, TRUE) != 0;
2695}
2696
34aeb2e9
KW
2697STATIC void
2698S_warn_on_first_deprecated_use(pTHX_ const char * const name,
2699 const char * const alternative,
2700 const bool use_locale,
2701 const char * const file,
2702 const unsigned line)
2703{
2704 const char * key;
2705
2706 PERL_ARGS_ASSERT_WARN_ON_FIRST_DEPRECATED_USE;
2707
2708 if (ckWARN_d(WARN_DEPRECATED)) {
2709
2710 key = Perl_form(aTHX_ "%s;%d;%s;%d", name, use_locale, file, line);
2711 if (! hv_fetch(PL_seen_deprecated_macro, key, strlen(key), 0)) {
2712 if (! PL_seen_deprecated_macro) {
2713 PL_seen_deprecated_macro = newHV();
2714 }
2715 if (! hv_store(PL_seen_deprecated_macro, key,
2716 strlen(key), &PL_sv_undef, 0))
2717 {
2718 Perl_croak(aTHX_ "panic: hv_store() unexpectedly failed");
2719 }
2720
c44e9413 2721 if (instr(file, "mathoms.c")) {
607313a1
KW
2722 Perl_warner(aTHX_ WARN_DEPRECATED,
2723 "In %s, line %d, starting in Perl v5.30, %s()"
2724 " will be removed. Avoid this message by"
2725 " converting to use %s().\n",
2726 file, line, name, alternative);
2727 }
2728 else {
34aeb2e9
KW
2729 Perl_warner(aTHX_ WARN_DEPRECATED,
2730 "In %s, line %d, starting in Perl v5.30, %s() will"
2731 " require an additional parameter. Avoid this"
2732 " message by converting to use %s().\n",
2733 file, line, name, alternative);
607313a1 2734 }
34aeb2e9
KW
2735 }
2736 }
2737}
2738
bde6a22d 2739bool
34aeb2e9 2740Perl__is_utf8_FOO(pTHX_ U8 classnum,
be99e2c2 2741 const U8 * const p,
34aeb2e9
KW
2742 const char * const name,
2743 const char * const alternative,
2744 const bool use_utf8,
2745 const bool use_locale,
2746 const char * const file,
2747 const unsigned line)
922e8cb4 2748{
922e8cb4
KW
2749 PERL_ARGS_ASSERT__IS_UTF8_FOO;
2750
34aeb2e9
KW
2751 warn_on_first_deprecated_use(name, alternative, use_locale, file, line);
2752
2753 if (use_utf8 && UTF8_IS_ABOVE_LATIN1(*p)) {
34aeb2e9
KW
2754
2755 switch (classnum) {
2756 case _CC_WORDCHAR:
2757 case _CC_DIGIT:
2758 case _CC_ALPHA:
2759 case _CC_LOWER:
2760 case _CC_UPPER:
2761 case _CC_PUNCT:
2762 case _CC_PRINT:
2763 case _CC_ALPHANUMERIC:
2764 case _CC_GRAPH:
2765 case _CC_CASED:
2766
2767 return is_utf8_common(p,
2768 &PL_utf8_swash_ptrs[classnum],
2769 swash_property_names[classnum],
2770 PL_XPosix_ptrs[classnum]);
2771
2772 case _CC_SPACE:
2773 return is_XPERLSPACE_high(p);
2774 case _CC_BLANK:
2775 return is_HORIZWS_high(p);
2776 case _CC_XDIGIT:
2777 return is_XDIGIT_high(p);
2778 case _CC_CNTRL:
2779 return 0;
2780 case _CC_ASCII:
2781 return 0;
2782 case _CC_VERTSPACE:
2783 return is_VERTWS_high(p);
2784 case _CC_IDFIRST:
2785 if (! PL_utf8_perl_idstart) {
22f0498f
KW
2786 PL_utf8_perl_idstart
2787 = _new_invlist_C_array(_Perl_IDStart_invlist);
34aeb2e9 2788 }
22f0498f
KW
2789 return is_utf8_common(p, &PL_utf8_perl_idstart,
2790 "_Perl_IDStart", NULL);
34aeb2e9
KW
2791 case _CC_IDCONT:
2792 if (! PL_utf8_perl_idcont) {
22f0498f
KW
2793 PL_utf8_perl_idcont
2794 = _new_invlist_C_array(_Perl_IDCont_invlist);
34aeb2e9 2795 }
22f0498f
KW
2796 return is_utf8_common(p, &PL_utf8_perl_idcont,
2797 "_Perl_IDCont", NULL);
34aeb2e9
KW
2798 }
2799 }
2800
2801 /* idcont is the same as wordchar below 256 */
2802 if (classnum == _CC_IDCONT) {
2803 classnum = _CC_WORDCHAR;
2804 }
2805 else if (classnum == _CC_IDFIRST) {
2806 if (*p == '_') {
2807 return TRUE;
2808 }
2809 classnum = _CC_ALPHA;
2810 }
2811
2812 if (! use_locale) {
2813 if (! use_utf8 || UTF8_IS_INVARIANT(*p)) {
2814 return _generic_isCC(*p, classnum);
2815 }
922e8cb4 2816
34aeb2e9
KW
2817 return _generic_isCC(EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p + 1 )), classnum);
2818 }
2819 else {
2820 if (! use_utf8 || UTF8_IS_INVARIANT(*p)) {
2821 return isFOO_lc(classnum, *p);
2822 }
2823
2824 return isFOO_lc(classnum, EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p + 1 )));
2825 }
2826
2827 NOT_REACHED; /* NOTREACHED */
922e8cb4
KW
2828}
2829
2830bool
da8c1a98
KW
2831Perl__is_utf8_FOO_with_len(pTHX_ const U8 classnum, const U8 *p,
2832 const U8 * const e)
2833{
2834 PERL_ARGS_ASSERT__IS_UTF8_FOO_WITH_LEN;
2835
2836 assert(classnum < _FIRST_NON_SWASH_CC);
2837
2838 return is_utf8_common_with_len(p,
2839 e,
2840 &PL_utf8_swash_ptrs[classnum],
2841 swash_property_names[classnum],
2842 PL_XPosix_ptrs[classnum]);
2843}
2844
2845bool
da8c1a98
KW
2846Perl__is_utf8_perl_idstart_with_len(pTHX_ const U8 *p, const U8 * const e)
2847{
2848 SV* invlist = NULL;
2849
2850 PERL_ARGS_ASSERT__IS_UTF8_PERL_IDSTART_WITH_LEN;
2851
2852 if (! PL_utf8_perl_idstart) {
2853 invlist = _new_invlist_C_array(_Perl_IDStart_invlist);
2854 }
2855 return is_utf8_common_with_len(p, e, &PL_utf8_perl_idstart,
2856 "_Perl_IDStart", invlist);
2857}
2858
2859bool
f2645549 2860Perl__is_utf8_xidstart(pTHX_ const U8 *p)
c11ff943 2861{
f2645549 2862 PERL_ARGS_ASSERT__IS_UTF8_XIDSTART;
c11ff943
KW
2863
2864 if (*p == '_')
2865 return TRUE;
f25ce844 2866 return is_utf8_common(p, &PL_utf8_xidstart, "XIdStart", NULL);
c11ff943
KW
2867}
2868
2869bool
da8c1a98
KW
2870Perl__is_utf8_perl_idcont_with_len(pTHX_ const U8 *p, const U8 * const e)
2871{
2872 SV* invlist = NULL;
2873
2874 PERL_ARGS_ASSERT__IS_UTF8_PERL_IDCONT_WITH_LEN;
2875
2876 if (! PL_utf8_perl_idcont) {
2877 invlist = _new_invlist_C_array(_Perl_IDCont_invlist);
2878 }
2879 return is_utf8_common_with_len(p, e, &PL_utf8_perl_idcont,
2880 "_Perl_IDCont", invlist);
2881}
2882
2883bool
f2645549 2884Perl__is_utf8_idcont(pTHX_ const U8 *p)
82686b01 2885{
f2645549 2886 PERL_ARGS_ASSERT__IS_UTF8_IDCONT;
7918f24d 2887
f25ce844 2888 return is_utf8_common(p, &PL_utf8_idcont, "IdContinue", NULL);
a0ed51b3
LW
2889}
2890
2891bool
f2645549 2892Perl__is_utf8_xidcont(pTHX_ const U8 *p)
c11ff943 2893{
f2645549 2894 PERL_ARGS_ASSERT__IS_UTF8_XIDCONT;
c11ff943 2895
f25ce844 2896 return is_utf8_common(p, &PL_utf8_idcont, "XIdContinue", NULL);
c11ff943
KW
2897}
2898
2899bool
7dbf68d2
KW
2900Perl__is_utf8_mark(pTHX_ const U8 *p)
2901{
7dbf68d2
KW
2902 PERL_ARGS_ASSERT__IS_UTF8_MARK;
2903
f25ce844 2904 return is_utf8_common(p, &PL_utf8_mark, "IsM", NULL);
7dbf68d2
KW
2905}
2906
b9992569 2907 /* change namve uv1 to 'from' */
6a4a25f4 2908STATIC UV
b9992569
KW
2909S__to_utf8_case(pTHX_ const UV uv1, const U8 *p, U8* ustrp, STRLEN *lenp,
2910 SV **swashp, const char *normal, const char *special)
2911{
0134edef 2912 STRLEN len = 0;
7918f24d 2913
b9992569 2914 PERL_ARGS_ASSERT__TO_UTF8_CASE;
7918f24d 2915
36eaa811
KW
2916 /* For code points that don't change case, we already know that the output
2917 * of this function is the unchanged input, so we can skip doing look-ups
2918 * for them. Unfortunately the case-changing code points are scattered
2919 * around. But there are some long consecutive ranges where there are no
2920 * case changing code points. By adding tests, we can eliminate the lookup
2921 * for all the ones in such ranges. This is currently done here only for
2922 * just a few cases where the scripts are in common use in modern commerce
2923 * (and scripts adjacent to those which can be included without additional
2924 * tests). */
2925
2926 if (uv1 >= 0x0590) {
2927 /* This keeps from needing further processing the code points most
2928 * likely to be used in the following non-cased scripts: Hebrew,
2929 * Arabic, Syriac, Thaana, NKo, Samaritan, Mandaic, Devanagari,
2930 * Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada,
2931 * Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar */
2932 if (uv1 < 0x10A0) {
2933 goto cases_to_self;
2934 }
2935
2936 /* The following largish code point ranges also don't have case
2937 * changes, but khw didn't think they warranted extra tests to speed
2938 * them up (which would slightly slow down everything else above them):
2939 * 1100..139F Hangul Jamo, Ethiopic
2940 * 1400..1CFF Unified Canadian Aboriginal Syllabics, Ogham, Runic,
2941 * Tagalog, Hanunoo, Buhid, Tagbanwa, Khmer, Mongolian,
2942 * Limbu, Tai Le, New Tai Lue, Buginese, Tai Tham,
2943 * Combining Diacritical Marks Extended, Balinese,
2944 * Sundanese, Batak, Lepcha, Ol Chiki
2945 * 2000..206F General Punctuation
2946 */
2947
2948 if (uv1 >= 0x2D30) {
2949
2950 /* This keeps the from needing further processing the code points
2951 * most likely to be used in the following non-cased major scripts:
2952 * CJK, Katakana, Hiragana, plus some less-likely scripts.
2953 *
2954 * (0x2D30 above might have to be changed to 2F00 in the unlikely
2955 * event that Unicode eventually allocates the unused block as of
2956 * v8.0 2FE0..2FEF to code points that are cased. khw has verified
2957 * that the test suite will start having failures to alert you
2958 * should that happen) */
2959 if (uv1 < 0xA640) {
2960 goto cases_to_self;
2961 }
2962
2963 if (uv1 >= 0xAC00) {
2964 if (UNLIKELY(UNICODE_IS_SURROGATE(uv1))) {
5af9bc97
KW
2965 if (ckWARN_d(WARN_SURROGATE)) {
2966 const char* desc = (PL_op) ? OP_DESC(PL_op) : normal;
2967 Perl_warner(aTHX_ packWARN(WARN_SURROGATE),
56576a04
KW
2968 "Operation \"%s\" returns its argument for"
2969 " UTF-16 surrogate U+%04" UVXf, desc, uv1);
5af9bc97
KW
2970 }
2971 goto cases_to_self;
2972 }
36eaa811
KW
2973
2974 /* AC00..FAFF Catches Hangul syllables and private use, plus
2975 * some others */
2976 if (uv1 < 0xFB00) {
2977 goto cases_to_self;
2978
2979 }
2980
5af9bc97 2981 if (UNLIKELY(UNICODE_IS_SUPER(uv1))) {
76513bdc
KW
2982 if ( UNLIKELY(uv1 > MAX_NON_DEPRECATED_CP)
2983 && ckWARN_d(WARN_DEPRECATED))
2984 {
2985 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
2986 cp_above_legal_max, uv1, MAX_NON_DEPRECATED_CP);
5af9bc97
KW
2987 }
2988 if (ckWARN_d(WARN_NON_UNICODE)) {
2989 const char* desc = (PL_op) ? OP_DESC(PL_op) : normal;
2990 Perl_warner(aTHX_ packWARN(WARN_NON_UNICODE),
56576a04
KW
2991 "Operation \"%s\" returns its argument for"
2992 " non-Unicode code point 0x%04" UVXf, desc, uv1);
5af9bc97
KW
2993 }
2994 goto cases_to_self;
2995 }
3bfc1e70
KW
2996#ifdef HIGHEST_CASE_CHANGING_CP_FOR_USE_ONLY_BY_UTF8_DOT_C
2997 if (UNLIKELY(uv1
2998 > HIGHEST_CASE_CHANGING_CP_FOR_USE_ONLY_BY_UTF8_DOT_C))
2999 {
3000
56576a04
KW
3001 /* As of Unicode 10.0, this means we avoid swash creation
3002 * for anything beyond high Plane 1 (below emojis) */
3bfc1e70
KW
3003 goto cases_to_self;
3004 }
3005#endif
36eaa811
KW
3006 }
3007 }
9ae3ac1a 3008
36eaa811
KW
3009 /* Note that non-characters are perfectly legal, so no warning should
3010 * be given. There are so few of them, that it isn't worth the extra
3011 * tests to avoid swash creation */
9ae3ac1a
KW
3012 }
3013
0134edef 3014 if (!*swashp) /* load on-demand */
56576a04
KW
3015 *swashp = _core_swash_init("utf8", normal, &PL_sv_undef,
3016 4, 0, NULL, NULL);
0134edef 3017
a6f87d8c 3018 if (special) {
0134edef 3019 /* It might be "special" (sometimes, but not always,
2a37f04d 3020 * a multicharacter mapping) */
4a8240a3 3021 HV *hv = NULL;
b08cf34e
JH
3022 SV **svp;
3023
4a8240a3
KW
3024 /* If passed in the specials name, use that; otherwise use any
3025 * given in the swash */
3026 if (*special != '\0') {
3027 hv = get_hv(special, 0);
3028 }
3029 else {
3030 svp = hv_fetchs(MUTABLE_HV(SvRV(*swashp)), "SPECIALS", 0);
3031 if (svp) {
3032 hv = MUTABLE_HV(SvRV(*svp));
3033 }
3034 }
3035
176fe009 3036 if (hv
5f560d8a 3037 && (svp = hv_fetch(hv, (const char*)p, UVCHR_SKIP(uv1), FALSE))
176fe009
KW
3038 && (*svp))
3039 {
cfd0369c 3040 const char *s;
47654450 3041
cfd0369c 3042 s = SvPV_const(*svp, len);
47654450 3043 if (len == 1)
f4cd282c 3044 /* EIGHTBIT */
c80e42f3 3045 len = uvchr_to_utf8(ustrp, *(U8*)s) - ustrp;
2a37f04d 3046 else {
d2dcd0fb 3047 Copy(s, ustrp, len, U8);
29e98929 3048 }
983ffd37 3049 }
0134edef
JH
3050 }
3051
3052 if (!len && *swashp) {
4a4088c4 3053 const UV uv2 = swash_fetch(*swashp, p, TRUE /* => is UTF-8 */);
d4c19fe8 3054
0134edef
JH
3055 if (uv2) {
3056 /* It was "normal" (a single character mapping). */
f4cd282c 3057 len = uvchr_to_utf8(ustrp, uv2) - ustrp;
2a37f04d
JH
3058 }
3059 }
1feea2c7 3060
cbe07460
KW
3061 if (len) {
3062 if (lenp) {
3063 *lenp = len;
3064 }
3065 return valid_utf8_to_uvchr(ustrp, 0);
3066 }
3067
3068 /* Here, there was no mapping defined, which means that the code point maps
3069 * to itself. Return the inputs */
e24dfe9c 3070 cases_to_self:
bfdf22ec 3071 len = UTF8SKIP(p);
ca9fab46
KW
3072 if (p != ustrp) { /* Don't copy onto itself */
3073 Copy(p, ustrp, len, U8);
3074 }
0134edef 3075
2a37f04d
JH
3076 if (lenp)
3077 *lenp = len;
3078
f4cd282c 3079 return uv1;
cbe07460 3080
a0ed51b3
LW
3081}
3082
051a06d4 3083STATIC UV
56576a04
KW
3084S_check_locale_boundary_crossing(pTHX_ const U8* const p, const UV result,
3085 U8* const ustrp, STRLEN *lenp)
051a06d4 3086{
4a4088c4 3087 /* This is called when changing the case of a UTF-8-encoded character above
31f05a37
KW
3088 * the Latin1 range, and the operation is in a non-UTF-8 locale. If the
3089 * result contains a character that crosses the 255/256 boundary, disallow
3090 * the change, and return the original code point. See L<perlfunc/lc> for
3091 * why;
051a06d4 3092 *
a1433954
KW
3093 * p points to the original string whose case was changed; assumed
3094 * by this routine to be well-formed
051a06d4 3095 * result the code point of the first character in the changed-case string
56576a04
KW
3096 * ustrp points to the changed-case string (<result> represents its
3097 * first char)
051a06d4
KW
3098 * lenp points to the length of <ustrp> */
3099
3100 UV original; /* To store the first code point of <p> */
3101
3102 PERL_ARGS_ASSERT_CHECK_LOCALE_BOUNDARY_CROSSING;
3103
a4f12ed7 3104 assert(UTF8_IS_ABOVE_LATIN1(*p));
051a06d4
KW
3105
3106 /* We know immediately if the first character in the string crosses the
3107 * boundary, so can skip */
3108 if (result > 255) {
3109
3110 /* Look at every character in the result; if any cross the
3111 * boundary, the whole thing is disallowed */
3112 U8* s = ustrp + UTF8SKIP(ustrp);
3113 U8* e = ustrp + *lenp;
3114 while (s < e) {
a4f12ed7 3115 if (! UTF8_IS_ABOVE_LATIN1(*s)) {
051a06d4
KW
3116 goto bad_crossing;
3117 }
3118 s += UTF8SKIP(s);
3119 }
3120
613abc6d
KW
3121 /* Here, no characters crossed, result is ok as-is, but we warn. */
3122 _CHECK_AND_OUTPUT_WIDE_LOCALE_UTF8_MSG(p, p + UTF8SKIP(p));
051a06d4
KW
3123 return result;
3124 }
3125
7b52d656 3126 bad_crossing:
051a06d4
KW
3127
3128 /* Failed, have to return the original */
4b88fb76 3129 original = valid_utf8_to_uvchr(p, lenp);
ab0b796c
KW
3130
3131 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3132 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
56576a04
KW
3133 "Can't do %s(\"\\x{%" UVXf "}\") on non-UTF-8"
3134 " locale; resolved to \"\\x{%" UVXf "}\".",
357aadde 3135 OP_DESC(PL_op),
ab0b796c
KW
3136 original,
3137 original);
051a06d4
KW
3138 Copy(p, ustrp, *lenp, char);
3139 return original;
3140}
3141
607313a1
KW
3142STATIC U32
3143S_check_and_deprecate(pTHX_ const U8 *p,
3144 const U8 **e,
3145 const unsigned int type, /* See below */
3146 const bool use_locale, /* Is this a 'LC_'
3147 macro call? */
3148 const char * const file,
3149 const unsigned line)
3150{
3151 /* This is a temporary function to deprecate the unsafe calls to the case
3152 * changing macros and functions. It keeps all the special stuff in just
3153 * one place.
3154 *
3155 * It updates *e with the pointer to the end of the input string. If using
3156 * the old-style macros, *e is NULL on input, and so this function assumes
3157 * the input string is long enough to hold the entire UTF-8 sequence, and
3158 * sets *e accordingly, but it then returns a flag to pass the
3159 * utf8n_to_uvchr(), to tell it that this size is a guess, and to avoid
3160 * using the full length if possible.
3161 *
3162 * It also does the assert that *e > p when *e is not NULL. This should be
3163 * migrated to the callers when this function gets deleted.
3164 *
3165 * The 'type' parameter is used for the caller to specify which case
3166 * changing function this is called from: */
3167
3168# define DEPRECATE_TO_UPPER 0
3169# define DEPRECATE_TO_TITLE 1
3170# define DEPRECATE_TO_LOWER 2
3171# define DEPRECATE_TO_FOLD 3
3172
3173 U32 utf8n_flags = 0;
3174 const char * name;
3175 const char * alternative;
3176
3177 PERL_ARGS_ASSERT_CHECK_AND_DEPRECATE;
3178
3179 if (*e == NULL) {
3180 utf8n_flags = _UTF8_NO_CONFIDENCE_IN_CURLEN;
3181 *e = p + UTF8SKIP(p);
3182
3183 /* For mathoms.c calls, we use the function name we know is stored
c44e9413 3184 * there. It could be part of a larger path */
607313a1 3185 if (type == DEPRECATE_TO_UPPER) {
c44e9413 3186 name = instr(file, "mathoms.c")
607313a1
KW
3187 ? "to_utf8_upper"
3188 : "toUPPER_utf8";
3189 alternative = "toUPPER_utf8_safe";
3190 }
3191 else if (type == DEPRECATE_TO_TITLE) {
c44e9413 3192 name = instr(file, "mathoms.c")
607313a1
KW
3193 ? "to_utf8_title"
3194 : "toTITLE_utf8";
3195 alternative = "toTITLE_utf8_safe";
3196 }
3197 else if (type == DEPRECATE_TO_LOWER) {
c44e9413 3198 name = instr(file, "mathoms.c")
607313a1
KW
3199 ? "to_utf8_lower"
3200 : "toLOWER_utf8";
3201 alternative = "toLOWER_utf8_safe";
3202 }
3203 else if (type == DEPRECATE_TO_FOLD) {
c44e9413 3204 name = instr(file, "mathoms.c")
607313a1
KW
3205 ? "to_utf8_fold"
3206 : "toFOLD_utf8";
3207 alternative = "toFOLD_utf8_safe";
3208 }
3209 else Perl_croak(aTHX_ "panic: Unexpected case change type");
3210
3211 warn_on_first_deprecated_use(name, alternative, use_locale, file, line);
3212 }
3213 else {
3214 assert (p < *e);
3215 }
3216
3217 return utf8n_flags;
3218}
3219
eaf412bf
KW
3220/* The process for changing the case is essentially the same for the four case
3221 * change types, except there are complications for folding. Otherwise the
3222 * difference is only which case to change to. To make sure that they all do
3223 * the same thing, the bodies of the functions are extracted out into the
3224 * following two macros. The functions are written with the same variable
3225 * names, and these are known and used inside these macros. It would be
3226 * better, of course, to have inline functions to do it, but since different
3227 * macros are called, depending on which case is being changed to, this is not
3228 * feasible in C (to khw's knowledge). Two macros are created so that the fold
3229 * function can start with the common start macro, then finish with its special
3230 * handling; while the other three cases can just use the common end macro.
3231 *
3232 * The algorithm is to use the proper (passed in) macro or function to change
3233 * the case for code points that are below 256. The macro is used if using
3234 * locale rules for the case change; the function if not. If the code point is
3235 * above 255, it is computed from the input UTF-8, and another macro is called
3236 * to do the conversion. If necessary, the output is converted to UTF-8. If
3237 * using a locale, we have to check that the change did not cross the 255/256
3238 * boundary, see check_locale_boundary_crossing() for further details.
3239 *
3240 * The macros are split with the correct case change for the below-256 case
3241 * stored into 'result', and in the middle of an else clause for the above-255
3242 * case. At that point in the 'else', 'result' is not the final result, but is
3243 * the input code point calculated from the UTF-8. The fold code needs to
3244 * realize all this and take it from there.
3245 *
3246 * If you read the two macros as sequential, it's easier to understand what's
3247 * going on. */
3248#define CASE_CHANGE_BODY_START(locale_flags, LC_L1_change_macro, L1_func, \
3249 L1_func_extra_param) \
a239b1e2 3250 \
eaf412bf
KW
3251 if (flags & (locale_flags)) { \
3252 /* Treat a UTF-8 locale as not being in locale at all */ \
3253 if (IN_UTF8_CTYPE_LOCALE) { \
3254 flags &= ~(locale_flags); \
3255 } \
3256 else { \
3257 _CHECK_AND_WARN_PROBLEMATIC_LOCALE; \
3258 } \
3259 } \
3260 \
3261 if (UTF8_IS_INVARIANT(*p)) { \
3262 if (flags & (locale_flags)) { \
3263 result = LC_L1_change_macro(*p); \
3264 } \
3265 else { \
3266 return L1_func(*p, ustrp, lenp, L1_func_extra_param); \
3267 } \
3268 } \
a239b1e2 3269 else if UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(p, e) { \
eaf412bf
KW
3270 if (flags & (locale_flags)) { \
3271 result = LC_L1_change_macro(EIGHT_BIT_UTF8_TO_NATIVE(*p, \
3272 *(p+1))); \
3273 } \
3274 else { \
3275 return L1_func(EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p+1)), \
3276 ustrp, lenp, L1_func_extra_param); \
3277 } \
3278 } \
fa8ab374
KW
3279 else { /* malformed UTF-8 or ord above 255 */ \
3280 STRLEN len_result; \
fa8ab374
KW
3281 result = utf8n_to_uvchr(p, e - p, &len_result, UTF8_CHECK_ONLY); \
3282 if (len_result == (STRLEN) -1) { \
607313a1
KW
3283 _force_out_malformed_utf8_message(p, e, utf8n_flags, \
3284 1 /* Die */ ); \
fa8ab374 3285 }
eaf412bf
KW
3286
3287#define CASE_CHANGE_BODY_END(locale_flags, change_macro) \
3288 result = change_macro(result, p, ustrp, lenp); \
3289 \
3290 if (flags & (locale_flags)) { \
3291 result = check_locale_boundary_crossing(p, result, ustrp, lenp); \
3292 } \
3293 return result; \
3294 } \
3295 \
3296 /* Here, used locale rules. Convert back to UTF-8 */ \
3297 if (UTF8_IS_INVARIANT(result)) { \
3298 *ustrp = (U8) result; \
3299 *lenp = 1; \
3300 } \
3301 else { \
3302 *ustrp = UTF8_EIGHT_BIT_HI((U8) result); \
3303 *(ustrp + 1) = UTF8_EIGHT_BIT_LO((U8) result); \
3304 *lenp = 2; \
3305 } \
3306 \
3307 return result;
3308
d3e79532 3309/*
87cea99e 3310=for apidoc to_utf8_upper
d3e79532 3311
a239b1e2 3312Instead use L</toUPPER_utf8_safe>.
a1433954 3313
d3e79532
JH
3314=cut */
3315
051a06d4 3316/* Not currently externally documented, and subject to change:
31f05a37
KW
3317 * <flags> is set iff iff the rules from the current underlying locale are to
3318 * be used. */
051a06d4 3319
2104c8d9 3320UV
607313a1
KW
3321Perl__to_utf8_upper_flags(pTHX_ const U8 *p,
3322 const U8 *e,
3323 U8* ustrp,
3324 STRLEN *lenp,
3325 bool flags,
3326 const char * const file,
3327 const int line)
a0ed51b3 3328{
051a06d4 3329 UV result;
607313a1
KW
3330 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_UPPER,
3331 cBOOL(flags), file, line);
051a06d4
KW
3332
3333 PERL_ARGS_ASSERT__TO_UTF8_UPPER_FLAGS;
7918f24d 3334
eaf412bf
KW
3335 /* ~0 makes anything non-zero in 'flags' mean we are using locale rules */
3336 /* 2nd char of uc(U+DF) is 'S' */
3337 CASE_CHANGE_BODY_START(~0, toUPPER_LC, _to_upper_title_latin1, 'S');
3338 CASE_CHANGE_BODY_END (~0, CALL_UPPER_CASE);
983ffd37 3339}
a0ed51b3 3340
d3e79532 3341/*
87cea99e 3342=for apidoc to_utf8_title
d3e79532 3343
a239b1e2 3344Instead use L</toTITLE_utf8_safe>.
a1433954 3345
d3e79532
JH
3346=cut */
3347
051a06d4 3348/* Not currently externally documented, and subject to change:
31f05a37
KW
3349 * <flags> is set iff the rules from the current underlying locale are to be
3350 * used. Since titlecase is not defined in POSIX, for other than a
3351 * UTF-8 locale, uppercase is used instead for code points < 256.
445bf929 3352 */
051a06d4 3353
983ffd37 3354UV
607313a1
KW
3355Perl__to_utf8_title_flags(pTHX_ const U8 *p,
3356 const U8 *e,
3357 U8* ustrp,
3358 STRLEN *lenp,
3359 bool flags,
3360 const char * const file,
3361 const int line)
983ffd37 3362{
051a06d4 3363 UV result;
607313a1
KW
3364 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_TITLE,
3365 cBOOL(flags), file, line);
051a06d4
KW
3366
3367 PERL_ARGS_ASSERT__TO_UTF8_TITLE_FLAGS;
7918f24d 3368
eaf412bf
KW
3369 /* 2nd char of ucfirst(U+DF) is 's' */
3370 CASE_CHANGE_BODY_START(~0, toUPPER_LC, _to_upper_title_latin1, 's');
3371 CASE_CHANGE_BODY_END (~0, CALL_TITLE_CASE);
a0ed51b3
LW
3372}
3373
d3e79532 3374/*
87cea99e 3375=for apidoc to_utf8_lower
d3e79532 3376
a239b1e2 3377Instead use L</toLOWER_utf8_safe>.
a1433954 3378
d3e79532
JH
3379=cut */
3380
051a06d4 3381/* Not currently externally documented, and subject to change:
31f05a37
KW
3382 * <flags> is set iff iff the rules from the current underlying locale are to
3383 * be used.
3384 */
051a06d4 3385
2104c8d9 3386UV
607313a1
KW
3387Perl__to_utf8_lower_flags(pTHX_ const U8 *p,
3388 const U8 *e,
3389 U8* ustrp,
3390 STRLEN *lenp,
3391 bool flags,
3392 const char * const file,
3393 const int line)
a0ed51b3 3394{
051a06d4 3395 UV result;
607313a1
KW
3396 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_LOWER,
3397 cBOOL(flags), file, line);
051a06d4 3398
051a06d4 3399 PERL_ARGS_ASSERT__TO_UTF8_LOWER_FLAGS;
7918f24d 3400
eaf412bf
KW
3401 CASE_CHANGE_BODY_START(~0, toLOWER_LC, to_lower_latin1, 0 /* 0 is dummy */)
3402 CASE_CHANGE_BODY_END (~0, CALL_LOWER_CASE)
b4e400f9
JH
3403}
3404
d3e79532 3405/*
87cea99e 3406=for apidoc to_utf8_fold
d3e79532 3407
a239b1e2 3408Instead use L</toFOLD_utf8_safe>.
a1433954 3409
d3e79532
JH
3410=cut */
3411
051a06d4
KW
3412/* Not currently externally documented, and subject to change,
3413 * in <flags>
31f05a37
KW
3414 * bit FOLD_FLAGS_LOCALE is set iff the rules from the current underlying
3415 * locale are to be used.
051a06d4
KW
3416 * bit FOLD_FLAGS_FULL is set iff full case folds are to be used;
3417 * otherwise simple folds
a0270393
KW
3418 * bit FOLD_FLAGS_NOMIX_ASCII is set iff folds of non-ASCII to ASCII are
3419 * prohibited
445bf929 3420 */
36bb2ab6 3421
b4e400f9 3422UV
607313a1
KW
3423Perl__to_utf8_fold_flags(pTHX_ const U8 *p,
3424 const U8 *e,
3425 U8* ustrp,
3426 STRLEN *lenp,
3427 U8 flags,
3428 const char * const file,
3429 const int line)
b4e400f9 3430{
051a06d4 3431 UV result;
607313a1
KW
3432 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_FOLD,
3433 cBOOL(flags), file, line);
051a06d4 3434
36bb2ab6 3435 PERL_ARGS_ASSERT__TO_UTF8_FOLD_FLAGS;
7918f24d 3436
a0270393
KW
3437 /* These are mutually exclusive */
3438 assert (! ((flags & FOLD_FLAGS_LOCALE) && (flags & FOLD_FLAGS_NOMIX_ASCII)));
3439
50ba90ff
KW
3440 assert(p != ustrp); /* Otherwise overwrites */
3441
eaf412bf
KW
3442 CASE_CHANGE_BODY_START(FOLD_FLAGS_LOCALE, toFOLD_LC, _to_fold_latin1,
3443 ((flags) & (FOLD_FLAGS_FULL | FOLD_FLAGS_NOMIX_ASCII)));
31f05a37 3444
eaf412bf 3445 result = CALL_FOLD_CASE(result, p, ustrp, lenp, flags & FOLD_FLAGS_FULL);
a1dde8de 3446
1ca267a5
KW
3447 if (flags & FOLD_FLAGS_LOCALE) {
3448
76f2ffcd 3449# define LONG_S_T LATIN_SMALL_LIGATURE_LONG_S_T_UTF8
0766489e
KW
3450 const unsigned int long_s_t_len = sizeof(LONG_S_T) - 1;
3451
3452# ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
3453# define CAP_SHARP_S LATIN_CAPITAL_LETTER_SHARP_S_UTF8
76f2ffcd
KW
3454
3455 const unsigned int cap_sharp_s_len = sizeof(CAP_SHARP_S) - 1;
76f2ffcd 3456
538e84ed
KW
3457 /* Special case these two characters, as what normally gets
3458 * returned under locale doesn't work */
76f2ffcd
KW
3459 if (UTF8SKIP(p) == cap_sharp_s_len
3460 && memEQ((char *) p, CAP_SHARP_S, cap_sharp_s_len))
1ca267a5 3461 {
ab0b796c
KW
3462 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3463 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3464 "Can't do fc(\"\\x{1E9E}\") on non-UTF-8 locale; "
3465 "resolved to \"\\x{17F}\\x{17F}\".");
1ca267a5
KW
3466 goto return_long_s;
3467 }
0766489e
KW
3468 else
3469#endif
3470 if (UTF8SKIP(p) == long_s_t_len
76f2ffcd 3471 && memEQ((char *) p, LONG_S_T, long_s_t_len))
9fc2026f 3472 {
ab0b796c
KW
3473 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3474 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3475 "Can't do fc(\"\\x{FB05}\") on non-UTF-8 locale; "
3476 "resolved to \"\\x{FB06}\".");
9fc2026f
KW
3477 goto return_ligature_st;
3478 }
74894415
KW
3479
3480#if UNICODE_MAJOR_VERSION == 3 \
3481 && UNICODE_DOT_VERSION == 0 \
3482 && UNICODE_DOT_DOT_VERSION == 1
3483# define DOTTED_I LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE_UTF8
3484
3485 /* And special case this on this Unicode version only, for the same
3486 * reaons the other two are special cased. They would cross the
3487 * 255/256 boundary which is forbidden under /l, and so the code
3488 * wouldn't catch that they are equivalent (which they are only in
3489 * this release) */
3490 else if (UTF8SKIP(p) == sizeof(DOTTED_I) - 1
3491 && memEQ((char *) p, DOTTED_I, sizeof(DOTTED_I) - 1))
3492 {
3493 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3494 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3495 "Can't do fc(\"\\x{0130}\") on non-UTF-8 locale; "
3496 "resolved to \"\\x{0131}\".");
3497 goto return_dotless_i;
3498 }
3499#endif
3500
357aadde 3501 return check_locale_boundary_crossing(p, result, ustrp, lenp);
051a06d4 3502 }
a0270393
KW
3503 else if (! (flags & FOLD_FLAGS_NOMIX_ASCII)) {
3504 return result;
3505 }
3506 else {
4a4088c4 3507 /* This is called when changing the case of a UTF-8-encoded
9fc2026f
KW
3508 * character above the ASCII range, and the result should not
3509 * contain an ASCII character. */
a0270393
KW
3510
3511 UV original; /* To store the first code point of <p> */
3512
3513 /* Look at every character in the result; if any cross the
3514 * boundary, the whole thing is disallowed */
3515 U8* s = ustrp;
3516 U8* e = ustrp + *lenp;
3517 while (s < e) {
3518 if (isASCII(*s)) {
3519 /* Crossed, have to return the original */
3520 original = valid_utf8_to_uvchr(p, lenp);
1ca267a5 3521
9fc2026f 3522 /* But in these instances, there is an alternative we can
1ca267a5 3523 * return that is valid */
0766489e
KW
3524 if (original == LATIN_SMALL_LETTER_SHARP_S
3525#ifdef LATIN_CAPITAL_LETTER_SHARP_S /* not defined in early Unicode releases */
3526 || original == LATIN_CAPITAL_LETTER_SHARP_S
3527#endif
3528 ) {
1ca267a5
KW
3529 goto return_long_s;
3530 }
9fc2026f
KW
3531 else if (original == LATIN_SMALL_LIGATURE_LONG_S_T) {
3532 goto return_ligature_st;
3533 }
74894415
KW
3534#if UNICODE_MAJOR_VERSION == 3 \
3535 && UNICODE_DOT_VERSION == 0 \
3536 && UNICODE_DOT_DOT_VERSION == 1
3537
3538 else if (original == LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE) {
3539 goto return_dotless_i;
3540 }
3541#endif
a0270393
KW
3542 Copy(p, ustrp, *lenp, char);
3543 return original;
3544 }
3545 s += UTF8SKIP(s);
3546 }
051a06d4 3547
a0270393
KW
3548 /* Here, no characters crossed, result is ok as-is */
3549 return result;
3550 }
051a06d4
KW
3551 }
3552
4a4088c4 3553 /* Here, used locale rules. Convert back to UTF-8 */
051a06d4
KW
3554 if (UTF8_IS_INVARIANT(result)) {
3555 *ustrp = (U8) result;
3556 *lenp = 1;
3557 }
3558 else {
62cb07ea
KW
3559 *ustrp = UTF8_EIGHT_BIT_HI((U8) result);
3560 *(ustrp + 1) = UTF8_EIGHT_BIT_LO((U8) result);
051a06d4
KW
3561 *lenp = 2;
3562 }
3563
051a06d4 3564 return result;
1ca267a5
KW
3565
3566 return_long_s:
3567 /* Certain folds to 'ss' are prohibited by the options, but they do allow
3568 * folds to a string of two of these characters. By returning this
3569 * instead, then, e.g.,
3570 * fc("\x{1E9E}") eq fc("\x{17F}\x{17F}")
3571 * works. */
3572
3573 *lenp = 2 * sizeof(LATIN_SMALL_LETTER_LONG_S_UTF8) - 2;
3574 Copy(LATIN_SMALL_LETTER_LONG_S_UTF8 LATIN_SMALL_LETTER_LONG_S_UTF8,
3575 ustrp, *lenp, U8);
3576 return LATIN_SMALL_LETTER_LONG_S;
9fc2026f
KW
3577
3578 return_ligature_st:
3579 /* Two folds to 'st' are prohibited by the options; instead we pick one and
3580 * have the other one fold to it */
3581
3582 *lenp = sizeof(LATIN_SMALL_LIGATURE_ST_UTF8) - 1;
3583 Copy(LATIN_SMALL_LIGATURE_ST_UTF8, ustrp, *lenp, U8);
3584 return LATIN_SMALL_LIGATURE_ST;
74894415
KW
3585
3586#if UNICODE_MAJOR_VERSION == 3 \
3587 && UNICODE_DOT_VERSION == 0 \
3588 && UNICODE_DOT_DOT_VERSION == 1
3589
3590 return_dotless_i:
3591 *lenp = sizeof(LATIN_SMALL_LETTER_DOTLESS_I_UTF8) - 1;
3592 Copy(LATIN_SMALL_LETTER_DOTLESS_I_UTF8, ustrp, *lenp, U8);
3593 return LATIN_SMALL_LETTER_DOTLESS_I;
3594
3595#endif
3596
a0ed51b3
LW
3597}
3598
711a919c 3599/* Note:
f90a9a02 3600 * Returns a "swash" which is a hash described in utf8.c:Perl_swash_fetch().
711a919c
ST
3601 * C<pkg> is a pointer to a package name for SWASHNEW, should be "utf8".
3602 * For other parameters, see utf8::SWASHNEW in lib/utf8_heavy.pl.
3603 */
c4a5db0c 3604
a0ed51b3 3605SV*
56576a04
KW
3606Perl_swash_init(pTHX_ const char* pkg, const char* name, SV *listsv,
3607 I32 minbits, I32 none)
a0ed51b3 3608{
c4a5db0c
KW
3609 PERL_ARGS_ASSERT_SWASH_INIT;
3610
3611 /* Returns a copy of a swash initiated by the called function. This is the
3612 * public interface, and returning a copy prevents others from doing
3613 * mischief on the original */
3614
56576a04
KW
3615 return newSVsv(_core_swash_init(pkg, name, listsv, minbits, none,
3616 NULL, NULL));
c4a5db0c
KW
3617}
3618
3619SV*
56576a04
KW
3620Perl__core_swash_init(pTHX_ const char* pkg, const char* name, SV *listsv,
3621 I32 minbits, I32 none, SV* invlist,
3622 U8* const flags_p)
c4a5db0c 3623{
2c1f00b9
YO
3624
3625 /*NOTE NOTE NOTE - If you want to use "return" in this routine you MUST
3626 * use the following define */
3627
3628#define CORE_SWASH_INIT_RETURN(x) \
3629 PL_curpm= old_PL_curpm; \
3630 return x
3631
c4a5db0c 3632 /* Initialize and return a swash, creating it if necessary. It does this
87367d5f
KW
3633 * by calling utf8_heavy.pl in the general case. The returned value may be
3634 * the swash's inversion list instead if the input parameters allow it.
3635 * Which is returned should be immaterial to callers, as the only
923b6d4e
KW
3636 * operations permitted on a swash, swash_fetch(), _get_swash_invlist(),
3637 * and swash_to_invlist() handle both these transparently.
c4a5db0c
KW
3638 *
3639 * This interface should only be used by functions that won't destroy or
3640 * adversely change the swash, as doing so affects all other uses of the
3641 * swash in the program; the general public should use 'Perl_swash_init'
3642 * instead.
3643 *
3644 * pkg is the name of the package that <name> should be in.
3645 * name is the name of the swash to find. Typically it is a Unicode
3646 * property name, including user-defined ones
3647 * listsv is a string to initialize the swash with. It must be of the form
3648 * documented as the subroutine return value in
3649 * L<perlunicode/User-Defined Character Properties>
3650 * minbits is the number of bits required to represent each data element.
3651 * It is '1' for binary properties.
3652 * none I (khw) do not understand this one, but it is used only in tr///.
9a53f6cf 3653 * invlist is an inversion list to initialize the swash with (or NULL)
83199d38
KW
3654 * flags_p if non-NULL is the address of various input and output flag bits
3655 * to the routine, as follows: ('I' means is input to the routine;
3656 * 'O' means output from the routine. Only flags marked O are
3657 * meaningful on return.)
3658 * _CORE_SWASH_INIT_USER_DEFINED_PROPERTY indicates if the swash
3659 * came from a user-defined property. (I O)
5d3d13d1
KW
3660 * _CORE_SWASH_INIT_RETURN_IF_UNDEF indicates that instead of croaking
3661 * when the swash cannot be located, to simply return NULL. (I)
87367d5f
KW
3662 * _CORE_SWASH_INIT_ACCEPT_INVLIST indicates that the caller will accept a
3663 * return of an inversion list instead of a swash hash if this routine
3664 * thinks that would result in faster execution of swash_fetch() later
3665 * on. (I)
9a53f6cf
KW
3666 *
3667 * Thus there are three possible inputs to find the swash: <name>,
3668 * <listsv>, and <invlist>. At least one must be specified. The result
3669 * will be the union of the specified ones, although <listsv>'s various
aabbdbda
KW
3670 * actions can intersect, etc. what <name> gives. To avoid going out to
3671 * disk at all, <invlist> should specify completely what the swash should
3672 * have, and <listsv> should be &PL_sv_undef and <name> should be "".
9a53f6cf
KW
3673 *
3674 * <invlist> is only valid for binary properties */
c4a5db0c 3675
2c1f00b9
YO
3676 PMOP *old_PL_curpm= PL_curpm; /* save away the old PL_curpm */
3677
c4a5db0c 3678 SV* retval = &PL_sv_undef;
83199d38 3679 HV* swash_hv = NULL;
87367d5f
KW
3680 const int invlist_swash_boundary =
3681 (flags_p && *flags_p & _CORE_SWASH_INIT_ACCEPT_INVLIST)
3682 ? 512 /* Based on some benchmarking, but not extensive, see commit
3683 message */
3684 : -1; /* Never return just an inversion list */
9a53f6cf
KW
3685
3686 assert(listsv != &PL_sv_undef || strNE(name, "") || invlist);
3687 assert(! invlist || minbits == 1);
3688
56576a04
KW
3689 PL_curpm= NULL; /* reset PL_curpm so that we dont get confused between the
3690 regex that triggered the swash init and the swash init
3691 perl logic itself. See perl #122747 */
2c1f00b9 3692
9a53f6cf
KW
3693 /* If data was passed in to go out to utf8_heavy to find the swash of, do
3694 * so */
3695 if (listsv != &PL_sv_undef || strNE(name, "")) {
69794297
KW
3696 dSP;
3697 const size_t pkg_len = strlen(pkg);
3698 const size_t name_len = strlen(name);
3699 HV * const stash = gv_stashpvn(pkg, pkg_len, 0);
3700 SV* errsv_save;
3701 GV *method;
3702
3703 PERL_ARGS_ASSERT__CORE_SWASH_INIT;
3704
3705 PUSHSTACKi(PERLSI_MAGIC);
ce3b816e 3706 ENTER;
69794297 3707 SAVEHINTS();
2782061f 3708 save_re_context();
650f067c
JL
3709 /* We might get here via a subroutine signature which uses a utf8
3710 * parameter name, at which point PL_subname will have been set
3711 * but not yet used. */
3712 save_item(PL_subname);
69794297
KW
3713 if (PL_parser && PL_parser->error_count)
3714 SAVEI8(PL_parser->error_count), PL_parser->error_count = 0;
3715 method = gv_fetchmeth(stash, "SWASHNEW", 8, -1);
4a4088c4 3716 if (!method) { /* demand load UTF-8 */
69794297 3717 ENTER;
db2c6cb3
FC
3718 if ((errsv_save = GvSV(PL_errgv))) SAVEFREESV(errsv_save);
3719 GvSV(PL_errgv) = NULL;
1a419e6b 3720#ifndef NO_TAINT_SUPPORT
69794297
KW
3721 /* It is assumed that callers of this routine are not passing in
3722 * any user derived data. */
2782061f
DM
3723 /* Need to do this after save_re_context() as it will set
3724 * PL_tainted to 1 while saving $1 etc (see the code after getrx:
3725 * in Perl_magic_get). Even line to create errsv_save can turn on
3726 * PL_tainted. */
284167a5
SM
3727 SAVEBOOL(TAINT_get);
3728 TAINT_NOT;
3729#endif
69794297
KW
3730 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpvn(pkg,pkg_len),
3731 NULL);
eed484f9 3732 {
db2c6cb3
FC
3733 /* Not ERRSV, as there is no need to vivify a scalar we are
3734 about to discard. */
3735 SV * const errsv = GvSV(PL_errgv);
3736 if (!SvTRUE(errsv)) {
3737 GvSV(PL_errgv) = SvREFCNT_inc_simple(errsv_save);