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a0ed51b3
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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[] =
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40 "Use of code point 0x%" UVXf " is not allowed; "
41 "the permissible max is 0x%" UVXf;
760c7c2f 42
114d9c4d 43#define MAX_NON_DEPRECATED_CP ((UV) (IV_MAX))
901b21bf 44
48ef279e 45/*
ccfc67b7 46=head1 Unicode Support
7fefc6c1 47These are various utility functions for manipulating UTF8-encoded
72d33970 48strings. For the uninitiated, this is a method of representing arbitrary
61296642 49Unicode characters as a variable number of bytes, in such a way that
56da48f7
DM
50characters in the ASCII range are unmodified, and a zero byte never appears
51within non-zero characters.
166f8a29 52
eaf7a4d2
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53=cut
54*/
55
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56void
57Perl__force_out_malformed_utf8_message(pTHX_
58 const U8 *const p, /* First byte in UTF-8 sequence */
59 const U8 * const e, /* Final byte in sequence (may include
60 multiple chars */
61 const U32 flags, /* Flags to pass to utf8n_to_uvchr(),
62 usually 0, or some DISALLOW flags */
63 const bool die_here) /* If TRUE, this function does not return */
64{
65 /* This core-only function is to be called when a malformed UTF-8 character
66 * is found, in order to output the detailed information about the
67 * malformation before dieing. The reason it exists is for the occasions
68 * when such a malformation is fatal, but warnings might be turned off, so
69 * that normally they would not be actually output. This ensures that they
70 * do get output. Because a sequence may be malformed in more than one
71 * way, multiple messages may be generated, so we can't make them fatal, as
72 * that would cause the first one to die.
73 *
74 * Instead we pretend -W was passed to perl, then die afterwards. The
75 * flexibility is here to return to the caller so they can finish up and
76 * die themselves */
77 U32 errors;
78
79 PERL_ARGS_ASSERT__FORCE_OUT_MALFORMED_UTF8_MESSAGE;
80
81 ENTER;
c15a80f3 82 SAVEI8(PL_dowarn);
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83 SAVESPTR(PL_curcop);
84
85 PL_dowarn = G_WARN_ALL_ON|G_WARN_ON;
86 if (PL_curcop) {
87 PL_curcop->cop_warnings = pWARN_ALL;
88 }
89
90 (void) utf8n_to_uvchr_error(p, e - p, NULL, flags & ~UTF8_CHECK_ONLY, &errors);
91
92 LEAVE;
93
94 if (! errors) {
95 Perl_croak(aTHX_ "panic: _force_out_malformed_utf8_message should"
96 " be called only when there are errors found");
97 }
98
99 if (die_here) {
100 Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)");
101 }
102}
103
eaf7a4d2 104/*
378516de 105=for apidoc uvoffuni_to_utf8_flags
eebe1485 106
a27992cc 107THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
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108Instead, B<Almost all code should use L</uvchr_to_utf8> or
109L</uvchr_to_utf8_flags>>.
a27992cc 110
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111This function is like them, but the input is a strict Unicode
112(as opposed to native) code point. Only in very rare circumstances should code
113not be using the native code point.
949cf498 114
efa9cd84 115For details, see the description for L</uvchr_to_utf8_flags>.
949cf498 116
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117=cut
118*/
119
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120#define HANDLE_UNICODE_SURROGATE(uv, flags) \
121 STMT_START { \
122 if (flags & UNICODE_WARN_SURROGATE) { \
123 Perl_ck_warner_d(aTHX_ packWARN(WARN_SURROGATE), \
147e3846 124 "UTF-16 surrogate U+%04" UVXf, uv); \
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125 } \
126 if (flags & UNICODE_DISALLOW_SURROGATE) { \
127 return NULL; \
128 } \
129 } STMT_END;
130
131#define HANDLE_UNICODE_NONCHAR(uv, flags) \
132 STMT_START { \
133 if (flags & UNICODE_WARN_NONCHAR) { \
134 Perl_ck_warner_d(aTHX_ packWARN(WARN_NONCHAR), \
147e3846 135 "Unicode non-character U+%04" UVXf " is not " \
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136 "recommended for open interchange", uv); \
137 } \
138 if (flags & UNICODE_DISALLOW_NONCHAR) { \
139 return NULL; \
140 } \
141 } STMT_END;
142
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143/* Use shorter names internally in this file */
144#define SHIFT UTF_ACCUMULATION_SHIFT
145#undef MARK
146#define MARK UTF_CONTINUATION_MARK
147#define MASK UTF_CONTINUATION_MASK
148
dfe13c55 149U8 *
4b31b634 150Perl_uvoffuni_to_utf8_flags(pTHX_ U8 *d, UV uv, const UV flags)
a0ed51b3 151{
378516de 152 PERL_ARGS_ASSERT_UVOFFUNI_TO_UTF8_FLAGS;
7918f24d 153
2d1545e5 154 if (OFFUNI_IS_INVARIANT(uv)) {
4c8cd605 155 *d++ = LATIN1_TO_NATIVE(uv);
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156 return d;
157 }
facc1dc2 158
3ea68d71 159 if (uv <= MAX_UTF8_TWO_BYTE) {
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160 *d++ = I8_TO_NATIVE_UTF8(( uv >> SHIFT) | UTF_START_MARK(2));
161 *d++ = I8_TO_NATIVE_UTF8(( uv & MASK) | MARK);
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162 return d;
163 }
d9432125 164
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165 /* Not 2-byte; test for and handle 3-byte result. In the test immediately
166 * below, the 16 is for start bytes E0-EF (which are all the possible ones
167 * for 3 byte characters). The 2 is for 2 continuation bytes; these each
168 * contribute SHIFT bits. This yields 0x4000 on EBCDIC platforms, 0x1_0000
169 * on ASCII; so 3 bytes covers the range 0x400-0x3FFF on EBCDIC;
170 * 0x800-0xFFFF on ASCII */
171 if (uv < (16 * (1U << (2 * SHIFT)))) {
172 *d++ = I8_TO_NATIVE_UTF8(( uv >> ((3 - 1) * SHIFT)) | UTF_START_MARK(3));
173 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((2 - 1) * SHIFT)) & MASK) | MARK);
174 *d++ = I8_TO_NATIVE_UTF8(( uv /* (1 - 1) */ & MASK) | MARK);
175
176#ifndef EBCDIC /* These problematic code points are 4 bytes on EBCDIC, so
177 aren't tested here */
178 /* The most likely code points in this range are below the surrogates.
179 * Do an extra test to quickly exclude those. */
180 if (UNLIKELY(uv >= UNICODE_SURROGATE_FIRST)) {
181 if (UNLIKELY( UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv)
182 || UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)))
183 {
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184 HANDLE_UNICODE_NONCHAR(uv, flags);
185 }
186 else if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
187 HANDLE_UNICODE_SURROGATE(uv, flags);
760c7c2f 188 }
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189 }
190#endif
191 return d;
192 }
193
194 /* Not 3-byte; that means the code point is at least 0x1_0000 on ASCII
195 * platforms, and 0x4000 on EBCDIC. There are problematic cases that can
196 * happen starting with 4-byte characters on ASCII platforms. We unify the
197 * code for these with EBCDIC, even though some of them require 5-bytes on
198 * those, because khw believes the code saving is worth the very slight
199 * performance hit on these high EBCDIC code points. */
200
201 if (UNLIKELY(UNICODE_IS_SUPER(uv))) {
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202 if (UNLIKELY(uv > MAX_NON_DEPRECATED_CP)) {
203 Perl_croak(aTHX_ cp_above_legal_max, uv, MAX_NON_DEPRECATED_CP);
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204 }
205 if ( (flags & UNICODE_WARN_SUPER)
206 || ( UNICODE_IS_ABOVE_31_BIT(uv)
207 && (flags & UNICODE_WARN_ABOVE_31_BIT)))
208 {
209 Perl_ck_warner_d(aTHX_ packWARN(WARN_NON_UNICODE),
210
211 /* Choose the more dire applicable warning */
212 (UNICODE_IS_ABOVE_31_BIT(uv))
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213 ? "Code point 0x%" UVXf " is not Unicode, and not portable"
214 : "Code point 0x%" UVXf " is not Unicode, may not be portable",
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215 uv);
216 }
217 if (flags & UNICODE_DISALLOW_SUPER
218 || ( UNICODE_IS_ABOVE_31_BIT(uv)
219 && (flags & UNICODE_DISALLOW_ABOVE_31_BIT)))
220 {
221 return NULL;
222 }
223 }
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224 else if (UNLIKELY(UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv))) {
225 HANDLE_UNICODE_NONCHAR(uv, flags);
507b9800 226 }
d9432125 227
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228 /* Test for and handle 4-byte result. In the test immediately below, the
229 * 8 is for start bytes F0-F7 (which are all the possible ones for 4 byte
230 * characters). The 3 is for 3 continuation bytes; these each contribute
231 * SHIFT bits. This yields 0x4_0000 on EBCDIC platforms, 0x20_0000 on
232 * ASCII, so 4 bytes covers the range 0x4000-0x3_FFFF on EBCDIC;
233 * 0x1_0000-0x1F_FFFF on ASCII */
234 if (uv < (8 * (1U << (3 * SHIFT)))) {
235 *d++ = I8_TO_NATIVE_UTF8(( uv >> ((4 - 1) * SHIFT)) | UTF_START_MARK(4));
236 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((3 - 1) * SHIFT)) & MASK) | MARK);
237 *d++ = I8_TO_NATIVE_UTF8(((uv >> ((2 - 1) * SHIFT)) & MASK) | MARK);
238 *d++ = I8_TO_NATIVE_UTF8(( uv /* (1 - 1) */ & MASK) | MARK);
239
240#ifdef EBCDIC /* These were handled on ASCII platforms in the code for 3-byte
241 characters. The end-plane non-characters for EBCDIC were
242 handled just above */
243 if (UNLIKELY(UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv))) {
244 HANDLE_UNICODE_NONCHAR(uv, flags);
d528804a 245 }
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246 else if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
247 HANDLE_UNICODE_SURROGATE(uv, flags);
248 }
249#endif
250
251 return d;
252 }
253
254 /* Not 4-byte; that means the code point is at least 0x20_0000 on ASCII
255 * platforms, and 0x4000 on EBCDIC. At this point we switch to a loop
256 * format. The unrolled version above turns out to not save all that much
257 * time, and at these high code points (well above the legal Unicode range
258 * on ASCII platforms, and well above anything in common use in EBCDIC),
259 * khw believes that less code outweighs slight performance gains. */
260
d9432125 261 {
5aaebcb3 262 STRLEN len = OFFUNISKIP(uv);
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263 U8 *p = d+len-1;
264 while (p > d) {
4c8cd605 265 *p-- = I8_TO_NATIVE_UTF8((uv & UTF_CONTINUATION_MASK) | UTF_CONTINUATION_MARK);
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266 uv >>= UTF_ACCUMULATION_SHIFT;
267 }
4c8cd605 268 *p = I8_TO_NATIVE_UTF8((uv & UTF_START_MASK(len)) | UTF_START_MARK(len));
1d72bdf6
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269 return d+len;
270 }
a0ed51b3 271}
a5bf80e0 272
646ca15d 273/*
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274=for apidoc uvchr_to_utf8
275
bcb1a2d4 276Adds the UTF-8 representation of the native code point C<uv> to the end
f2fc1b45 277of the string C<d>; C<d> should have at least C<UVCHR_SKIP(uv)+1> (up to
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278C<UTF8_MAXBYTES+1>) free bytes available. The return value is the pointer to
279the byte after the end of the new character. In other words,
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280
281 d = uvchr_to_utf8(d, uv);
282
283is the recommended wide native character-aware way of saying
284
285 *(d++) = uv;
286
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287This function accepts any UV as input, but very high code points (above
288C<IV_MAX> on the platform) will raise a deprecation warning. This is
289typically 0x7FFF_FFFF in a 32-bit word.
290
291It is possible to forbid or warn on non-Unicode code points, or those that may
292be problematic by using L</uvchr_to_utf8_flags>.
de69f3af 293
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294=cut
295*/
296
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297/* This is also a macro */
298PERL_CALLCONV U8* Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv);
299
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300U8 *
301Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv)
302{
de69f3af 303 return uvchr_to_utf8(d, uv);
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304}
305
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306/*
307=for apidoc uvchr_to_utf8_flags
308
309Adds the UTF-8 representation of the native code point C<uv> to the end
f2fc1b45 310of the string C<d>; C<d> should have at least C<UVCHR_SKIP(uv)+1> (up to
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311C<UTF8_MAXBYTES+1>) free bytes available. The return value is the pointer to
312the byte after the end of the new character. In other words,
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313
314 d = uvchr_to_utf8_flags(d, uv, flags);
315
316or, in most cases,
317
318 d = uvchr_to_utf8_flags(d, uv, 0);
319
320This is the Unicode-aware way of saying
321
322 *(d++) = uv;
323
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324If C<flags> is 0, this function accepts any UV as input, but very high code
325points (above C<IV_MAX> for the platform) will raise a deprecation warning.
326This is typically 0x7FFF_FFFF in a 32-bit word.
327
328Specifying C<flags> can further restrict what is allowed and not warned on, as
329follows:
de69f3af 330
796b6530 331If C<uv> is a Unicode surrogate code point and C<UNICODE_WARN_SURROGATE> is set,
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332the function will raise a warning, provided UTF8 warnings are enabled. If
333instead C<UNICODE_DISALLOW_SURROGATE> is set, the function will fail and return
334NULL. If both flags are set, the function will both warn and return NULL.
de69f3af 335
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336Similarly, the C<UNICODE_WARN_NONCHAR> and C<UNICODE_DISALLOW_NONCHAR> flags
337affect how the function handles a Unicode non-character.
93e6dbd6 338
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339And likewise, the C<UNICODE_WARN_SUPER> and C<UNICODE_DISALLOW_SUPER> flags
340affect the handling of code points that are above the Unicode maximum of
3410x10FFFF. Languages other than Perl may not be able to accept files that
342contain these.
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343
344The flag C<UNICODE_WARN_ILLEGAL_INTERCHANGE> selects all three of
345the above WARN flags; and C<UNICODE_DISALLOW_ILLEGAL_INTERCHANGE> selects all
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346three DISALLOW flags. C<UNICODE_DISALLOW_ILLEGAL_INTERCHANGE> restricts the
347allowed inputs to the strict UTF-8 traditionally defined by Unicode.
348Similarly, C<UNICODE_WARN_ILLEGAL_C9_INTERCHANGE> and
349C<UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE> are shortcuts to select the
350above-Unicode and surrogate flags, but not the non-character ones, as
351defined in
352L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>.
353See L<perlunicode/Noncharacter code points>.
93e6dbd6 354
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355Code points above 0x7FFF_FFFF (2**31 - 1) were never specified in any standard,
356so using them is more problematic than other above-Unicode code points. Perl
357invented an extension to UTF-8 to represent the ones above 2**36-1, so it is
358likely that non-Perl languages will not be able to read files that contain
359these that written by the perl interpreter; nor would Perl understand files
360written by something that uses a different extension. For these reasons, there
361is a separate set of flags that can warn and/or disallow these extremely high
362code points, even if other above-Unicode ones are accepted. These are the
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363C<UNICODE_WARN_ABOVE_31_BIT> and C<UNICODE_DISALLOW_ABOVE_31_BIT> flags. These
364are entirely independent from the deprecation warning for code points above
365C<IV_MAX>. On 32-bit machines, it will eventually be forbidden to have any
366code point that needs more than 31 bits to represent. When that happens,
367effectively the C<UNICODE_DISALLOW_ABOVE_31_BIT> flag will always be set on
36832-bit machines. (Of course C<UNICODE_DISALLOW_SUPER> will treat all
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369above-Unicode code points, including these, as malformations; and
370C<UNICODE_WARN_SUPER> warns on these.)
371
372On EBCDIC platforms starting in Perl v5.24, the Perl extension for representing
373extremely high code points kicks in at 0x3FFF_FFFF (2**30 -1), which is lower
374than on ASCII. Prior to that, code points 2**31 and higher were simply
375unrepresentable, and a different, incompatible method was used to represent
376code points between 2**30 and 2**31 - 1. The flags C<UNICODE_WARN_ABOVE_31_BIT>
377and C<UNICODE_DISALLOW_ABOVE_31_BIT> have the same function as on ASCII
378platforms, warning and disallowing 2**31 and higher.
de69f3af 379
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380=cut
381*/
382
383/* This is also a macro */
384PERL_CALLCONV U8* Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags);
385
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386U8 *
387Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags)
388{
de69f3af 389 return uvchr_to_utf8_flags(d, uv, flags);
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390}
391
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392PERL_STATIC_INLINE bool
393S_is_utf8_cp_above_31_bits(const U8 * const s, const U8 * const e)
394{
395 /* Returns TRUE if the first code point represented by the Perl-extended-
396 * UTF-8-encoded string starting at 's', and looking no further than 'e -
397 * 1' doesn't fit into 31 bytes. That is, that if it is >= 2**31.
398 *
399 * The function handles the case where the input bytes do not include all
400 * the ones necessary to represent a full character. That is, they may be
401 * the intial bytes of the representation of a code point, but possibly
402 * the final ones necessary for the complete representation may be beyond
403 * 'e - 1'.
404 *
405 * The function assumes that the sequence is well-formed UTF-8 as far as it
406 * goes, and is for a UTF-8 variant code point. If the sequence is
407 * incomplete, the function returns FALSE if there is any well-formed
408 * UTF-8 byte sequence that can complete it in such a way that a code point
409 * < 2**31 is produced; otherwise it returns TRUE.
410 *
411 * Getting this exactly right is slightly tricky, and has to be done in
412 * several places in this file, so is centralized here. It is based on the
413 * following table:
414 *
415 * U+7FFFFFFF (2 ** 31 - 1)
416 * ASCII: \xFD\xBF\xBF\xBF\xBF\xBF
417 * IBM-1047: \xFE\x41\x41\x41\x41\x41\x41\x42\x73\x73\x73\x73\x73\x73
418 * IBM-037: \xFE\x41\x41\x41\x41\x41\x41\x42\x72\x72\x72\x72\x72\x72
419 * POSIX-BC: \xFE\x41\x41\x41\x41\x41\x41\x42\x75\x75\x75\x75\x75\x75
420 * I8: \xFF\xA0\xA0\xA0\xA0\xA0\xA0\xA1\xBF\xBF\xBF\xBF\xBF\xBF
421 * U+80000000 (2 ** 31):
422 * ASCII: \xFE\x82\x80\x80\x80\x80\x80
423 * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] 10 11 12 13
424 * IBM-1047: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
425 * IBM-037: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
426 * POSIX-BC: \xFE\x41\x41\x41\x41\x41\x41\x43\x41\x41\x41\x41\x41\x41
427 * I8: \xFF\xA0\xA0\xA0\xA0\xA0\xA0\xA2\xA0\xA0\xA0\xA0\xA0\xA0
428 */
429
430#ifdef EBCDIC
431
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432 /* [0] is start byte [1] [2] [3] [4] [5] [6] [7] */
433 const U8 prefix[] = "\x41\x41\x41\x41\x41\x41\x42";
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434 const STRLEN prefix_len = sizeof(prefix) - 1;
435 const STRLEN len = e - s;
f880f78a 436 const STRLEN cmp_len = MIN(prefix_len, len - 1);
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437
438#else
439
440 PERL_UNUSED_ARG(e);
441
442#endif
443
444 PERL_ARGS_ASSERT_IS_UTF8_CP_ABOVE_31_BITS;
445
446 assert(! UTF8_IS_INVARIANT(*s));
447
448#ifndef EBCDIC
449
450 /* Technically, a start byte of FE can be for a code point that fits into
451 * 31 bytes, but not for well-formed UTF-8: doing that requires an overlong
452 * malformation. */
453 return (*s >= 0xFE);
454
455#else
456
457 /* On the EBCDIC code pages we handle, only 0xFE can mean a 32-bit or
458 * larger code point (0xFF is an invariant). For 0xFE, we need at least 2
459 * bytes, and maybe up through 8 bytes, to be sure if the value is above 31
460 * bits. */
461 if (*s != 0xFE || len == 1) {
462 return FALSE;
463 }
464
465 /* Note that in UTF-EBCDIC, the two lowest possible continuation bytes are
466 * \x41 and \x42. */
467 return cBOOL(memGT(s + 1, prefix, cmp_len));
468
469#endif
470
471}
472
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473PERL_STATIC_INLINE bool
474S_does_utf8_overflow(const U8 * const s, const U8 * e)
475{
476 const U8 *x;
477 const U8 * y = (const U8 *) HIGHEST_REPRESENTABLE_UTF8;
478
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KW
479#if ! defined(UV_IS_QUAD) && ! defined(EBCDIC)
480
481 const STRLEN len = e - s;
482
483#endif
484
12a4bed3
KW
485 /* Returns a boolean as to if this UTF-8 string would overflow a UV on this
486 * platform, that is if it represents a code point larger than the highest
487 * representable code point. (For ASCII platforms, we could use memcmp()
488 * because we don't have to convert each byte to I8, but it's very rare
489 * input indeed that would approach overflow, so the loop below will likely
490 * only get executed once.
491 *
492 * 'e' must not be beyond a full character. If it is less than a full
493 * character, the function returns FALSE if there is any input beyond 'e'
494 * that could result in a non-overflowing code point */
495
496 PERL_ARGS_ASSERT_DOES_UTF8_OVERFLOW;
b0b342d4
KW
497 assert(s <= e && s + UTF8SKIP(s) >= e);
498
499#if ! defined(UV_IS_QUAD) && ! defined(EBCDIC)
500
501 /* On 32 bit ASCII machines, many overlongs that start with FF don't
502 * overflow */
503
c551bb01 504 if (isFF_OVERLONG(s, len)) {
b0b342d4
KW
505 const U8 max_32_bit_overlong[] = "\xFF\x80\x80\x80\x80\x80\x80\x84";
506 return memGE(s, max_32_bit_overlong,
c551bb01 507 MIN(len, sizeof(max_32_bit_overlong) - 1));
b0b342d4
KW
508 }
509
510#endif
12a4bed3
KW
511
512 for (x = s; x < e; x++, y++) {
513
514 /* If this byte is larger than the corresponding highest UTF-8 byte, it
515 * overflows */
516 if (UNLIKELY(NATIVE_UTF8_TO_I8(*x) > *y)) {
517 return TRUE;
518 }
519
520 /* If not the same as this byte, it must be smaller, doesn't overflow */
521 if (LIKELY(NATIVE_UTF8_TO_I8(*x) != *y)) {
522 return FALSE;
523 }
524 }
525
526 /* Got to the end and all bytes are the same. If the input is a whole
527 * character, it doesn't overflow. And if it is a partial character,
528 * there's not enough information to tell, so assume doesn't overflow */
529 return FALSE;
530}
531
532PERL_STATIC_INLINE bool
533S_is_utf8_overlong_given_start_byte_ok(const U8 * const s, const STRLEN len)
534{
535 /* Overlongs can occur whenever the number of continuation bytes
536 * changes. That means whenever the number of leading 1 bits in a start
537 * byte increases from the next lower start byte. That happens for start
538 * bytes C0, E0, F0, F8, FC, FE, and FF. On modern perls, the following
539 * illegal start bytes have already been excluded, so don't need to be
540 * tested here;
541 * ASCII platforms: C0, C1
542 * EBCDIC platforms C0, C1, C2, C3, C4, E0
543 *
544 * At least a second byte is required to determine if other sequences will
545 * be an overlong. */
546
547 const U8 s0 = NATIVE_UTF8_TO_I8(s[0]);
548 const U8 s1 = NATIVE_UTF8_TO_I8(s[1]);
549
550 PERL_ARGS_ASSERT_IS_UTF8_OVERLONG_GIVEN_START_BYTE_OK;
551 assert(len > 1 && UTF8_IS_START(*s));
552
553 /* Each platform has overlongs after the start bytes given above (expressed
554 * in I8 for EBCDIC). What constitutes an overlong varies by platform, but
555 * the logic is the same, except the E0 overlong has already been excluded
556 * on EBCDIC platforms. The values below were found by manually
557 * inspecting the UTF-8 patterns. See the tables in utf8.h and
558 * utfebcdic.h. */
559
560# ifdef EBCDIC
561# define F0_ABOVE_OVERLONG 0xB0
562# define F8_ABOVE_OVERLONG 0xA8
563# define FC_ABOVE_OVERLONG 0xA4
564# define FE_ABOVE_OVERLONG 0xA2
565# define FF_OVERLONG_PREFIX "\xfe\x41\x41\x41\x41\x41\x41\x41"
566 /* I8(0xfe) is FF */
567# else
568
569 if (s0 == 0xE0 && UNLIKELY(s1 < 0xA0)) {
570 return TRUE;
571 }
572
573# define F0_ABOVE_OVERLONG 0x90
574# define F8_ABOVE_OVERLONG 0x88
575# define FC_ABOVE_OVERLONG 0x84
576# define FE_ABOVE_OVERLONG 0x82
577# define FF_OVERLONG_PREFIX "\xff\x80\x80\x80\x80\x80\x80"
578# endif
579
580
581 if ( (s0 == 0xF0 && UNLIKELY(s1 < F0_ABOVE_OVERLONG))
582 || (s0 == 0xF8 && UNLIKELY(s1 < F8_ABOVE_OVERLONG))
583 || (s0 == 0xFC && UNLIKELY(s1 < FC_ABOVE_OVERLONG))
584 || (s0 == 0xFE && UNLIKELY(s1 < FE_ABOVE_OVERLONG)))
585 {
586 return TRUE;
587 }
588
b0b342d4
KW
589 /* Check for the FF overlong */
590 return isFF_OVERLONG(s, len);
591}
592
593PERL_STATIC_INLINE bool
594S_isFF_OVERLONG(const U8 * const s, const STRLEN len)
595{
596 PERL_ARGS_ASSERT_ISFF_OVERLONG;
12a4bed3
KW
597
598 /* Check for the FF overlong. This happens only if all these bytes match;
599 * what comes after them doesn't matter. See tables in utf8.h,
b0b342d4 600 * utfebcdic.h. */
12a4bed3 601
b0b342d4
KW
602 return len >= sizeof(FF_OVERLONG_PREFIX) - 1
603 && UNLIKELY(memEQ(s, FF_OVERLONG_PREFIX,
604 sizeof(FF_OVERLONG_PREFIX) - 1));
12a4bed3
KW
605}
606
607#undef F0_ABOVE_OVERLONG
608#undef F8_ABOVE_OVERLONG
609#undef FC_ABOVE_OVERLONG
610#undef FE_ABOVE_OVERLONG
611#undef FF_OVERLONG_PREFIX
612
35f8c9bd 613STRLEN
edc2c47a 614Perl__is_utf8_char_helper(const U8 * const s, const U8 * e, const U32 flags)
35f8c9bd 615{
2b479609 616 STRLEN len;
12a4bed3 617 const U8 *x;
35f8c9bd 618
2b479609
KW
619 /* A helper function that should not be called directly.
620 *
621 * This function returns non-zero if the string beginning at 's' and
622 * looking no further than 'e - 1' is well-formed Perl-extended-UTF-8 for a
623 * code point; otherwise it returns 0. The examination stops after the
624 * first code point in 's' is validated, not looking at the rest of the
625 * input. If 'e' is such that there are not enough bytes to represent a
626 * complete code point, this function will return non-zero anyway, if the
627 * bytes it does have are well-formed UTF-8 as far as they go, and aren't
628 * excluded by 'flags'.
629 *
630 * A non-zero return gives the number of bytes required to represent the
631 * code point. Be aware that if the input is for a partial character, the
632 * return will be larger than 'e - s'.
633 *
634 * This function assumes that the code point represented is UTF-8 variant.
635 * The caller should have excluded this possibility before calling this
636 * function.
637 *
638 * 'flags' can be 0, or any combination of the UTF8_DISALLOW_foo flags
639 * accepted by L</utf8n_to_uvchr>. If non-zero, this function will return
640 * 0 if the code point represented is well-formed Perl-extended-UTF-8, but
641 * disallowed by the flags. If the input is only for a partial character,
642 * the function will return non-zero if there is any sequence of
643 * well-formed UTF-8 that, when appended to the input sequence, could
644 * result in an allowed code point; otherwise it returns 0. Non characters
645 * cannot be determined based on partial character input. But many of the
646 * other excluded types can be determined with just the first one or two
647 * bytes.
648 *
649 */
650
651 PERL_ARGS_ASSERT__IS_UTF8_CHAR_HELPER;
652
653 assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE
654 |UTF8_DISALLOW_ABOVE_31_BIT)));
655 assert(! UTF8_IS_INVARIANT(*s));
35f8c9bd 656
2b479609 657 /* A variant char must begin with a start byte */
35f8c9bd
KW
658 if (UNLIKELY(! UTF8_IS_START(*s))) {
659 return 0;
660 }
661
edc2c47a
KW
662 /* Examine a maximum of a single whole code point */
663 if (e - s > UTF8SKIP(s)) {
664 e = s + UTF8SKIP(s);
665 }
666
2b479609
KW
667 len = e - s;
668
669 if (flags && isUTF8_POSSIBLY_PROBLEMATIC(*s)) {
670 const U8 s0 = NATIVE_UTF8_TO_I8(s[0]);
35f8c9bd 671
2b479609
KW
672 /* The code below is derived from this table. Keep in mind that legal
673 * continuation bytes range between \x80..\xBF for UTF-8, and
674 * \xA0..\xBF for I8. Anything above those aren't continuation bytes.
675 * Hence, we don't have to test the upper edge because if any of those
676 * are encountered, the sequence is malformed, and will fail elsewhere
677 * in this function.
678 * UTF-8 UTF-EBCDIC I8
679 * U+D800: \xED\xA0\x80 \xF1\xB6\xA0\xA0 First surrogate
680 * U+DFFF: \xED\xBF\xBF \xF1\xB7\xBF\xBF Final surrogate
681 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0 First above Unicode
682 *
683 */
684
685#ifdef EBCDIC /* On EBCDIC, these are actually I8 bytes */
686# define FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER 0xFA
19794540 687# define IS_UTF8_2_BYTE_SUPER(s0, s1) ((s0) == 0xF9 && (s1) >= 0xA2)
2b479609 688
19794540
KW
689# define IS_UTF8_2_BYTE_SURROGATE(s0, s1) ((s0) == 0xF1 \
690 /* B6 and B7 */ \
691 && ((s1) & 0xFE ) == 0xB6)
2b479609
KW
692#else
693# define FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER 0xF5
19794540
KW
694# define IS_UTF8_2_BYTE_SUPER(s0, s1) ((s0) == 0xF4 && (s1) >= 0x90)
695# define IS_UTF8_2_BYTE_SURROGATE(s0, s1) ((s0) == 0xED && (s1) >= 0xA0)
2b479609
KW
696#endif
697
698 if ( (flags & UTF8_DISALLOW_SUPER)
ddb65933
KW
699 && UNLIKELY(s0 >= FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER))
700 {
2b479609
KW
701 return 0; /* Above Unicode */
702 }
703
704 if ( (flags & UTF8_DISALLOW_ABOVE_31_BIT)
705 && UNLIKELY(is_utf8_cp_above_31_bits(s, e)))
706 {
707 return 0; /* Above 31 bits */
708 }
709
710 if (len > 1) {
711 const U8 s1 = NATIVE_UTF8_TO_I8(s[1]);
712
713 if ( (flags & UTF8_DISALLOW_SUPER)
19794540 714 && UNLIKELY(IS_UTF8_2_BYTE_SUPER(s0, s1)))
2b479609
KW
715 {
716 return 0; /* Above Unicode */
717 }
718
719 if ( (flags & UTF8_DISALLOW_SURROGATE)
19794540 720 && UNLIKELY(IS_UTF8_2_BYTE_SURROGATE(s0, s1)))
2b479609
KW
721 {
722 return 0; /* Surrogate */
723 }
724
725 if ( (flags & UTF8_DISALLOW_NONCHAR)
726 && UNLIKELY(UTF8_IS_NONCHAR(s, e)))
727 {
728 return 0; /* Noncharacter code point */
729 }
730 }
731 }
732
733 /* Make sure that all that follows are continuation bytes */
35f8c9bd
KW
734 for (x = s + 1; x < e; x++) {
735 if (UNLIKELY(! UTF8_IS_CONTINUATION(*x))) {
736 return 0;
737 }
738 }
739
af13dd8a 740 /* Here is syntactically valid. Next, make sure this isn't the start of an
12a4bed3
KW
741 * overlong. */
742 if (len > 1 && is_utf8_overlong_given_start_byte_ok(s, len)) {
743 return 0;
af13dd8a
KW
744 }
745
12a4bed3
KW
746 /* And finally, that the code point represented fits in a word on this
747 * platform */
748 if (does_utf8_overflow(s, e)) {
749 return 0;
35f8c9bd
KW
750 }
751
2b479609 752 return UTF8SKIP(s);
35f8c9bd
KW
753}
754
7e2f38b2
KW
755char *
756Perl__byte_dump_string(pTHX_ const U8 * s, const STRLEN len, const bool format)
7cf8d05d
KW
757{
758 /* Returns a mortalized C string that is a displayable copy of the 'len'
7e2f38b2
KW
759 * bytes starting at 's'. 'format' gives how to display each byte.
760 * Currently, there are only two formats, so it is currently a bool:
761 * 0 \xab
762 * 1 ab (that is a space between two hex digit bytes)
763 */
7cf8d05d
KW
764
765 const STRLEN output_len = 4 * len + 1; /* 4 bytes per each input, plus a
766 trailing NUL */
767 const U8 * const e = s + len;
768 char * output;
769 char * d;
770
771 PERL_ARGS_ASSERT__BYTE_DUMP_STRING;
772
773 Newx(output, output_len, char);
774 SAVEFREEPV(output);
775
776 d = output;
777 for (; s < e; s++) {
778 const unsigned high_nibble = (*s & 0xF0) >> 4;
779 const unsigned low_nibble = (*s & 0x0F);
780
7e2f38b2
KW
781 if (format) {
782 *d++ = ' ';
783 }
784 else {
785 *d++ = '\\';
786 *d++ = 'x';
787 }
7cf8d05d
KW
788
789 if (high_nibble < 10) {
790 *d++ = high_nibble + '0';
791 }
792 else {
793 *d++ = high_nibble - 10 + 'a';
794 }
795
796 if (low_nibble < 10) {
797 *d++ = low_nibble + '0';
798 }
799 else {
800 *d++ = low_nibble - 10 + 'a';
801 }
802 }
803
804 *d = '\0';
805 return output;
806}
807
806547a7 808PERL_STATIC_INLINE char *
7cf8d05d
KW
809S_unexpected_non_continuation_text(pTHX_ const U8 * const s,
810
811 /* How many bytes to print */
3cc6a05e 812 STRLEN print_len,
7cf8d05d
KW
813
814 /* Which one is the non-continuation */
815 const STRLEN non_cont_byte_pos,
816
817 /* How many bytes should there be? */
818 const STRLEN expect_len)
806547a7
KW
819{
820 /* Return the malformation warning text for an unexpected continuation
821 * byte. */
822
7cf8d05d 823 const char * const where = (non_cont_byte_pos == 1)
806547a7 824 ? "immediately"
7cf8d05d
KW
825 : Perl_form(aTHX_ "%d bytes",
826 (int) non_cont_byte_pos);
806547a7
KW
827
828 PERL_ARGS_ASSERT_UNEXPECTED_NON_CONTINUATION_TEXT;
829
7cf8d05d
KW
830 /* We don't need to pass this parameter, but since it has already been
831 * calculated, it's likely faster to pass it; verify under DEBUGGING */
832 assert(expect_len == UTF8SKIP(s));
833
834 return Perl_form(aTHX_ "%s: %s (unexpected non-continuation byte 0x%02x,"
835 " %s after start byte 0x%02x; need %d bytes, got %d)",
836 malformed_text,
7e2f38b2 837 _byte_dump_string(s, print_len, 0),
7cf8d05d
KW
838 *(s + non_cont_byte_pos),
839 where,
840 *s,
841 (int) expect_len,
842 (int) non_cont_byte_pos);
806547a7
KW
843}
844
35f8c9bd
KW
845/*
846
de69f3af 847=for apidoc utf8n_to_uvchr
378516de
KW
848
849THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
de69f3af 850Most code should use L</utf8_to_uvchr_buf>() rather than call this directly.
67e989fb 851
9041c2e3 852Bottom level UTF-8 decode routine.
de69f3af 853Returns the native code point value of the first character in the string C<s>,
746afd53
KW
854which is assumed to be in UTF-8 (or UTF-EBCDIC) encoding, and no longer than
855C<curlen> bytes; C<*retlen> (if C<retlen> isn't NULL) will be set to
856the length, in bytes, of that character.
949cf498
KW
857
858The value of C<flags> determines the behavior when C<s> does not point to a
2b5e7bc2
KW
859well-formed UTF-8 character. If C<flags> is 0, encountering a malformation
860causes zero to be returned and C<*retlen> is set so that (S<C<s> + C<*retlen>>)
861is the next possible position in C<s> that could begin a non-malformed
862character. Also, if UTF-8 warnings haven't been lexically disabled, a warning
863is raised. Some UTF-8 input sequences may contain multiple malformations.
864This function tries to find every possible one in each call, so multiple
865warnings can be raised for each sequence.
949cf498
KW
866
867Various ALLOW flags can be set in C<flags> to allow (and not warn on)
868individual types of malformations, such as the sequence being overlong (that
869is, when there is a shorter sequence that can express the same code point;
870overlong sequences are expressly forbidden in the UTF-8 standard due to
871potential security issues). Another malformation example is the first byte of
872a character not being a legal first byte. See F<utf8.h> for the list of such
94953955
KW
873flags. Even if allowed, this function generally returns the Unicode
874REPLACEMENT CHARACTER when it encounters a malformation. There are flags in
875F<utf8.h> to override this behavior for the overlong malformations, but don't
876do that except for very specialized purposes.
949cf498 877
796b6530 878The C<UTF8_CHECK_ONLY> flag overrides the behavior when a non-allowed (by other
949cf498
KW
879flags) malformation is found. If this flag is set, the routine assumes that
880the caller will raise a warning, and this function will silently just set
d088425d
KW
881C<retlen> to C<-1> (cast to C<STRLEN>) and return zero.
882
75200dff 883Note that this API requires disambiguation between successful decoding a C<NUL>
796b6530 884character, and an error return (unless the C<UTF8_CHECK_ONLY> flag is set), as
111fa700
KW
885in both cases, 0 is returned, and, depending on the malformation, C<retlen> may
886be set to 1. To disambiguate, upon a zero return, see if the first byte of
887C<s> is 0 as well. If so, the input was a C<NUL>; if not, the input had an
f9380377 888error. Or you can use C<L</utf8n_to_uvchr_error>>.
949cf498
KW
889
890Certain code points are considered problematic. These are Unicode surrogates,
746afd53 891Unicode non-characters, and code points above the Unicode maximum of 0x10FFFF.
949cf498 892By default these are considered regular code points, but certain situations
ecc1615f
KW
893warrant special handling for them, which can be specified using the C<flags>
894parameter. If C<flags> contains C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, all
895three classes are treated as malformations and handled as such. The flags
896C<UTF8_DISALLOW_SURROGATE>, C<UTF8_DISALLOW_NONCHAR>, and
897C<UTF8_DISALLOW_SUPER> (meaning above the legal Unicode maximum) can be set to
898disallow these categories individually. C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>
899restricts the allowed inputs to the strict UTF-8 traditionally defined by
900Unicode. Use C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE> to use the strictness
901definition given by
902L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>.
903The difference between traditional strictness and C9 strictness is that the
904latter does not forbid non-character code points. (They are still discouraged,
905however.) For more discussion see L<perlunicode/Noncharacter code points>.
906
907The flags C<UTF8_WARN_ILLEGAL_INTERCHANGE>,
908C<UTF8_WARN_ILLEGAL_C9_INTERCHANGE>, C<UTF8_WARN_SURROGATE>,
796b6530
KW
909C<UTF8_WARN_NONCHAR>, and C<UTF8_WARN_SUPER> will cause warning messages to be
910raised for their respective categories, but otherwise the code points are
911considered valid (not malformations). To get a category to both be treated as
912a malformation and raise a warning, specify both the WARN and DISALLOW flags.
949cf498 913(But note that warnings are not raised if lexically disabled nor if
796b6530 914C<UTF8_CHECK_ONLY> is also specified.)
949cf498 915
760c7c2f
KW
916It is now deprecated to have very high code points (above C<IV_MAX> on the
917platforms) and this function will raise a deprecation warning for these (unless
d5944cab 918such warnings are turned off). This value is typically 0x7FFF_FFFF (2**31 -1)
760c7c2f 919in a 32-bit word.
ab8e6d41
KW
920
921Code points above 0x7FFF_FFFF (2**31 - 1) were never specified in any standard,
922so using them is more problematic than other above-Unicode code points. Perl
923invented an extension to UTF-8 to represent the ones above 2**36-1, so it is
924likely that non-Perl languages will not be able to read files that contain
aff2be59 925these; nor would Perl understand files
ab8e6d41
KW
926written by something that uses a different extension. For these reasons, there
927is a separate set of flags that can warn and/or disallow these extremely high
928code points, even if other above-Unicode ones are accepted. These are the
760c7c2f
KW
929C<UTF8_WARN_ABOVE_31_BIT> and C<UTF8_DISALLOW_ABOVE_31_BIT> flags. These
930are entirely independent from the deprecation warning for code points above
931C<IV_MAX>. On 32-bit machines, it will eventually be forbidden to have any
932code point that needs more than 31 bits to represent. When that happens,
933effectively the C<UTF8_DISALLOW_ABOVE_31_BIT> flag will always be set on
93432-bit machines. (Of course C<UTF8_DISALLOW_SUPER> will treat all
ab8e6d41
KW
935above-Unicode code points, including these, as malformations; and
936C<UTF8_WARN_SUPER> warns on these.)
937
938On EBCDIC platforms starting in Perl v5.24, the Perl extension for representing
939extremely high code points kicks in at 0x3FFF_FFFF (2**30 -1), which is lower
940than on ASCII. Prior to that, code points 2**31 and higher were simply
941unrepresentable, and a different, incompatible method was used to represent
942code points between 2**30 and 2**31 - 1. The flags C<UTF8_WARN_ABOVE_31_BIT>
943and C<UTF8_DISALLOW_ABOVE_31_BIT> have the same function as on ASCII
944platforms, warning and disallowing 2**31 and higher.
949cf498
KW
945
946All other code points corresponding to Unicode characters, including private
947use and those yet to be assigned, are never considered malformed and never
948warn.
67e989fb 949
37607a96 950=cut
f9380377
KW
951
952Also implemented as a macro in utf8.h
953*/
954
955UV
956Perl_utf8n_to_uvchr(pTHX_ const U8 *s,
957 STRLEN curlen,
958 STRLEN *retlen,
959 const U32 flags)
960{
961 PERL_ARGS_ASSERT_UTF8N_TO_UVCHR;
962
963 return utf8n_to_uvchr_error(s, curlen, retlen, flags, NULL);
964}
965
966/*
967
968=for apidoc utf8n_to_uvchr_error
969
970THIS FUNCTION SHOULD BE USED IN ONLY VERY SPECIALIZED CIRCUMSTANCES.
971Most code should use L</utf8_to_uvchr_buf>() rather than call this directly.
972
973This function is for code that needs to know what the precise malformation(s)
974are when an error is found.
975
976It is like C<L</utf8n_to_uvchr>> but it takes an extra parameter placed after
977all the others, C<errors>. If this parameter is 0, this function behaves
978identically to C<L</utf8n_to_uvchr>>. Otherwise, C<errors> should be a pointer
979to a C<U32> variable, which this function sets to indicate any errors found.
980Upon return, if C<*errors> is 0, there were no errors found. Otherwise,
981C<*errors> is the bit-wise C<OR> of the bits described in the list below. Some
982of these bits will be set if a malformation is found, even if the input
7a65503b 983C<flags> parameter indicates that the given malformation is allowed; those
f9380377
KW
984exceptions are noted:
985
986=over 4
987
988=item C<UTF8_GOT_ABOVE_31_BIT>
989
990The code point represented by the input UTF-8 sequence occupies more than 31
991bits.
992This bit is set only if the input C<flags> parameter contains either the
993C<UTF8_DISALLOW_ABOVE_31_BIT> or the C<UTF8_WARN_ABOVE_31_BIT> flags.
994
995=item C<UTF8_GOT_CONTINUATION>
996
997The input sequence was malformed in that the first byte was a a UTF-8
998continuation byte.
999
1000=item C<UTF8_GOT_EMPTY>
1001
1002The input C<curlen> parameter was 0.
1003
1004=item C<UTF8_GOT_LONG>
1005
1006The input sequence was malformed in that there is some other sequence that
1007evaluates to the same code point, but that sequence is shorter than this one.
1008
1009=item C<UTF8_GOT_NONCHAR>
1010
1011The code point represented by the input UTF-8 sequence is for a Unicode
1012non-character code point.
1013This bit is set only if the input C<flags> parameter contains either the
1014C<UTF8_DISALLOW_NONCHAR> or the C<UTF8_WARN_NONCHAR> flags.
1015
1016=item C<UTF8_GOT_NON_CONTINUATION>
1017
1018The input sequence was malformed in that a non-continuation type byte was found
1019in a position where only a continuation type one should be.
1020
1021=item C<UTF8_GOT_OVERFLOW>
1022
1023The input sequence was malformed in that it is for a code point that is not
1024representable in the number of bits available in a UV on the current platform.
1025
1026=item C<UTF8_GOT_SHORT>
1027
1028The input sequence was malformed in that C<curlen> is smaller than required for
1029a complete sequence. In other words, the input is for a partial character
1030sequence.
1031
1032=item C<UTF8_GOT_SUPER>
1033
1034The input sequence was malformed in that it is for a non-Unicode code point;
1035that is, one above the legal Unicode maximum.
1036This bit is set only if the input C<flags> parameter contains either the
1037C<UTF8_DISALLOW_SUPER> or the C<UTF8_WARN_SUPER> flags.
1038
1039=item C<UTF8_GOT_SURROGATE>
1040
1041The input sequence was malformed in that it is for a -Unicode UTF-16 surrogate
1042code point.
1043This bit is set only if the input C<flags> parameter contains either the
1044C<UTF8_DISALLOW_SURROGATE> or the C<UTF8_WARN_SURROGATE> flags.
1045
1046=back
1047
133551d8
KW
1048To do your own error handling, call this function with the C<UTF8_CHECK_ONLY>
1049flag to suppress any warnings, and then examine the C<*errors> return.
1050
f9380377 1051=cut
37607a96 1052*/
67e989fb 1053
a0ed51b3 1054UV
f9380377
KW
1055Perl_utf8n_to_uvchr_error(pTHX_ const U8 *s,
1056 STRLEN curlen,
1057 STRLEN *retlen,
1058 const U32 flags,
1059 U32 * errors)
a0ed51b3 1060{
d4c19fe8 1061 const U8 * const s0 = s;
2b5e7bc2
KW
1062 U8 * send = NULL; /* (initialized to silence compilers' wrong
1063 warning) */
1064 U32 possible_problems = 0; /* A bit is set here for each potential problem
1065 found as we go along */
eb83ed87 1066 UV uv = *s;
2b5e7bc2
KW
1067 STRLEN expectlen = 0; /* How long should this sequence be?
1068 (initialized to silence compilers' wrong
1069 warning) */
e308b348 1070 STRLEN avail_len = 0; /* When input is too short, gives what that is */
f9380377
KW
1071 U32 discard_errors = 0; /* Used to save branches when 'errors' is NULL;
1072 this gets set and discarded */
a0dbb045 1073
2b5e7bc2
KW
1074 /* The below are used only if there is both an overlong malformation and a
1075 * too short one. Otherwise the first two are set to 's0' and 'send', and
1076 * the third not used at all */
1077 U8 * adjusted_s0 = (U8 *) s0;
5ec712b1
KW
1078 U8 * adjusted_send = NULL; /* (Initialized to silence compilers' wrong
1079 warning) */
e9f2c446
KW
1080 U8 temp_char_buf[UTF8_MAXBYTES + 1]; /* Used to avoid a Newx in this
1081 routine; see [perl #130921] */
2b5e7bc2 1082 UV uv_so_far = 0; /* (Initialized to silence compilers' wrong warning) */
7918f24d 1083
f9380377
KW
1084 PERL_ARGS_ASSERT_UTF8N_TO_UVCHR_ERROR;
1085
1086 if (errors) {
1087 *errors = 0;
1088 }
1089 else {
1090 errors = &discard_errors;
1091 }
a0dbb045 1092
eb83ed87
KW
1093 /* The order of malformation tests here is important. We should consume as
1094 * few bytes as possible in order to not skip any valid character. This is
1095 * required by the Unicode Standard (section 3.9 of Unicode 6.0); see also
1096 * http://unicode.org/reports/tr36 for more discussion as to why. For
1097 * example, once we've done a UTF8SKIP, we can tell the expected number of
1098 * bytes, and could fail right off the bat if the input parameters indicate
1099 * that there are too few available. But it could be that just that first
1100 * byte is garbled, and the intended character occupies fewer bytes. If we
1101 * blindly assumed that the first byte is correct, and skipped based on
1102 * that number, we could skip over a valid input character. So instead, we
1103 * always examine the sequence byte-by-byte.
1104 *
1105 * We also should not consume too few bytes, otherwise someone could inject
1106 * things. For example, an input could be deliberately designed to
1107 * overflow, and if this code bailed out immediately upon discovering that,
e2660c54 1108 * returning to the caller C<*retlen> pointing to the very next byte (one
eb83ed87
KW
1109 * which is actually part of of the overflowing sequence), that could look
1110 * legitimate to the caller, which could discard the initial partial
2b5e7bc2
KW
1111 * sequence and process the rest, inappropriately.
1112 *
1113 * Some possible input sequences are malformed in more than one way. This
1114 * function goes to lengths to try to find all of them. This is necessary
1115 * for correctness, as the inputs may allow one malformation but not
1116 * another, and if we abandon searching for others after finding the
1117 * allowed one, we could allow in something that shouldn't have been.
1118 */
eb83ed87 1119
b5b9af04 1120 if (UNLIKELY(curlen == 0)) {
2b5e7bc2
KW
1121 possible_problems |= UTF8_GOT_EMPTY;
1122 curlen = 0;
5a48568d 1123 uv = UNICODE_REPLACEMENT;
2b5e7bc2 1124 goto ready_to_handle_errors;
0c443dc2
JH
1125 }
1126
eb83ed87
KW
1127 expectlen = UTF8SKIP(s);
1128
1129 /* A well-formed UTF-8 character, as the vast majority of calls to this
1130 * function will be for, has this expected length. For efficiency, set
1131 * things up here to return it. It will be overriden only in those rare
1132 * cases where a malformation is found */
1133 if (retlen) {
1134 *retlen = expectlen;
1135 }
1136
1137 /* An invariant is trivially well-formed */
1d72bdf6 1138 if (UTF8_IS_INVARIANT(uv)) {
de69f3af 1139 return uv;
a0ed51b3 1140 }
67e989fb 1141
eb83ed87 1142 /* A continuation character can't start a valid sequence */
b5b9af04 1143 if (UNLIKELY(UTF8_IS_CONTINUATION(uv))) {
2b5e7bc2
KW
1144 possible_problems |= UTF8_GOT_CONTINUATION;
1145 curlen = 1;
1146 uv = UNICODE_REPLACEMENT;
1147 goto ready_to_handle_errors;
ba210ebe 1148 }
9041c2e3 1149
dcd27b3c 1150 /* Here is not a continuation byte, nor an invariant. The only thing left
ddb65933
KW
1151 * is a start byte (possibly for an overlong). (We can't use UTF8_IS_START
1152 * because it excludes start bytes like \xC0 that always lead to
1153 * overlongs.) */
dcd27b3c 1154
534752c1
KW
1155 /* Convert to I8 on EBCDIC (no-op on ASCII), then remove the leading bits
1156 * that indicate the number of bytes in the character's whole UTF-8
1157 * sequence, leaving just the bits that are part of the value. */
1158 uv = NATIVE_UTF8_TO_I8(uv) & UTF_START_MASK(expectlen);
ba210ebe 1159
e308b348
KW
1160 /* Setup the loop end point, making sure to not look past the end of the
1161 * input string, and flag it as too short if the size isn't big enough. */
1162 send = (U8*) s0;
1163 if (UNLIKELY(curlen < expectlen)) {
1164 possible_problems |= UTF8_GOT_SHORT;
1165 avail_len = curlen;
1166 send += curlen;
1167 }
1168 else {
1169 send += expectlen;
1170 }
1171 adjusted_send = send;
1172
eb83ed87 1173 /* Now, loop through the remaining bytes in the character's sequence,
e308b348 1174 * accumulating each into the working value as we go. */
eb83ed87 1175 for (s = s0 + 1; s < send; s++) {
b5b9af04 1176 if (LIKELY(UTF8_IS_CONTINUATION(*s))) {
8850bf83 1177 uv = UTF8_ACCUMULATE(uv, *s);
2b5e7bc2
KW
1178 continue;
1179 }
1180
1181 /* Here, found a non-continuation before processing all expected bytes.
1182 * This byte indicates the beginning of a new character, so quit, even
1183 * if allowing this malformation. */
2b5e7bc2 1184 possible_problems |= UTF8_GOT_NON_CONTINUATION;
e308b348 1185 break;
eb83ed87
KW
1186 } /* End of loop through the character's bytes */
1187
1188 /* Save how many bytes were actually in the character */
1189 curlen = s - s0;
1190
2b5e7bc2
KW
1191 /* Note that there are two types of too-short malformation. One is when
1192 * there is actual wrong data before the normal termination of the
1193 * sequence. The other is that the sequence wasn't complete before the end
1194 * of the data we are allowed to look at, based on the input 'curlen'.
1195 * This means that we were passed data for a partial character, but it is
1196 * valid as far as we saw. The other is definitely invalid. This
1197 * distinction could be important to a caller, so the two types are kept
15b010f0
KW
1198 * separate.
1199 *
1200 * A convenience macro that matches either of the too-short conditions. */
1201# define UTF8_GOT_TOO_SHORT (UTF8_GOT_SHORT|UTF8_GOT_NON_CONTINUATION)
1202
1203 if (UNLIKELY(possible_problems & UTF8_GOT_TOO_SHORT)) {
1204 uv_so_far = uv;
1205 uv = UNICODE_REPLACEMENT;
1206 }
2b5e7bc2
KW
1207
1208 /* Check for overflow */
1209 if (UNLIKELY(does_utf8_overflow(s0, send))) {
1210 possible_problems |= UTF8_GOT_OVERFLOW;
1211 uv = UNICODE_REPLACEMENT;
eb83ed87 1212 }
eb83ed87 1213
2b5e7bc2
KW
1214 /* Check for overlong. If no problems so far, 'uv' is the correct code
1215 * point value. Simply see if it is expressible in fewer bytes. Otherwise
1216 * we must look at the UTF-8 byte sequence itself to see if it is for an
1217 * overlong */
1218 if ( ( LIKELY(! possible_problems)
1219 && UNLIKELY(expectlen > (STRLEN) OFFUNISKIP(uv)))
1220 || ( UNLIKELY( possible_problems)
1221 && ( UNLIKELY(! UTF8_IS_START(*s0))
1222 || ( curlen > 1
1223 && UNLIKELY(is_utf8_overlong_given_start_byte_ok(s0,
1224 send - s0))))))
2f8f112e 1225 {
2b5e7bc2
KW
1226 possible_problems |= UTF8_GOT_LONG;
1227
2b5e7bc2
KW
1228 if (UNLIKELY(possible_problems & UTF8_GOT_TOO_SHORT)) {
1229 UV min_uv = uv_so_far;
1230 STRLEN i;
1231
1232 /* Here, the input is both overlong and is missing some trailing
1233 * bytes. There is no single code point it could be for, but there
1234 * may be enough information present to determine if what we have
1235 * so far is for an unallowed code point, such as for a surrogate.
1236 * The code below has the intelligence to determine this, but just
1237 * for non-overlong UTF-8 sequences. What we do here is calculate
1238 * the smallest code point the input could represent if there were
1239 * no too short malformation. Then we compute and save the UTF-8
1240 * for that, which is what the code below looks at instead of the
1241 * raw input. It turns out that the smallest such code point is
1242 * all we need. */
1243 for (i = curlen; i < expectlen; i++) {
1244 min_uv = UTF8_ACCUMULATE(min_uv,
1245 I8_TO_NATIVE_UTF8(UTF_CONTINUATION_MARK));
1246 }
1247
e9f2c446 1248 adjusted_s0 = temp_char_buf;
2b5e7bc2
KW
1249 adjusted_send = uvoffuni_to_utf8_flags(adjusted_s0, min_uv, 0);
1250 }
eb83ed87
KW
1251 }
1252
2b5e7bc2
KW
1253 /* Now check that the input isn't for a problematic code point not allowed
1254 * by the input parameters. */
1255 /* isn't problematic if < this */
1256 if ( ( ( LIKELY(! possible_problems) && uv >= UNICODE_SURROGATE_FIRST)
1257 || ( UNLIKELY(possible_problems)
d60baaa7
KW
1258
1259 /* if overflow, we know without looking further
1260 * precisely which of the problematic types it is,
1261 * and we deal with those in the overflow handling
1262 * code */
1263 && LIKELY(! (possible_problems & UTF8_GOT_OVERFLOW))
2b5e7bc2 1264 && isUTF8_POSSIBLY_PROBLEMATIC(*adjusted_s0)))
760c7c2f
KW
1265 && ((flags & ( UTF8_DISALLOW_NONCHAR
1266 |UTF8_DISALLOW_SURROGATE
1267 |UTF8_DISALLOW_SUPER
1268 |UTF8_DISALLOW_ABOVE_31_BIT
1269 |UTF8_WARN_NONCHAR
1270 |UTF8_WARN_SURROGATE
1271 |UTF8_WARN_SUPER
1272 |UTF8_WARN_ABOVE_31_BIT))
2b5e7bc2
KW
1273 /* In case of a malformation, 'uv' is not valid, and has
1274 * been changed to something in the Unicode range.
1275 * Currently we don't output a deprecation message if there
1276 * is already a malformation, so we don't have to special
1277 * case the test immediately below */
760c7c2f
KW
1278 || ( UNLIKELY(uv > MAX_NON_DEPRECATED_CP)
1279 && ckWARN_d(WARN_DEPRECATED))))
eb83ed87 1280 {
2b5e7bc2
KW
1281 /* If there were no malformations, or the only malformation is an
1282 * overlong, 'uv' is valid */
1283 if (LIKELY(! (possible_problems & ~UTF8_GOT_LONG))) {
1284 if (UNLIKELY(UNICODE_IS_SURROGATE(uv))) {
1285 possible_problems |= UTF8_GOT_SURROGATE;
1286 }
1287 else if (UNLIKELY(uv > PERL_UNICODE_MAX)) {
1288 possible_problems |= UTF8_GOT_SUPER;
1289 }
1290 else if (UNLIKELY(UNICODE_IS_NONCHAR(uv))) {
1291 possible_problems |= UTF8_GOT_NONCHAR;
1292 }
1293 }
1294 else { /* Otherwise, need to look at the source UTF-8, possibly
1295 adjusted to be non-overlong */
1296
1297 if (UNLIKELY(NATIVE_UTF8_TO_I8(*adjusted_s0)
1298 >= FIRST_START_BYTE_THAT_IS_DEFINITELY_SUPER))
ea5ced44 1299 {
2b5e7bc2
KW
1300 possible_problems |= UTF8_GOT_SUPER;
1301 }
1302 else if (curlen > 1) {
1303 if (UNLIKELY(IS_UTF8_2_BYTE_SUPER(
1304 NATIVE_UTF8_TO_I8(*adjusted_s0),
1305 NATIVE_UTF8_TO_I8(*(adjusted_s0 + 1)))))
ea5ced44 1306 {
2b5e7bc2 1307 possible_problems |= UTF8_GOT_SUPER;
ea5ced44 1308 }
2b5e7bc2
KW
1309 else if (UNLIKELY(IS_UTF8_2_BYTE_SURROGATE(
1310 NATIVE_UTF8_TO_I8(*adjusted_s0),
1311 NATIVE_UTF8_TO_I8(*(adjusted_s0 + 1)))))
1312 {
1313 possible_problems |= UTF8_GOT_SURROGATE;
ea5ced44
KW
1314 }
1315 }
c0236afe 1316
2b5e7bc2
KW
1317 /* We need a complete well-formed UTF-8 character to discern
1318 * non-characters, so can't look for them here */
1319 }
1320 }
949cf498 1321
2b5e7bc2
KW
1322 ready_to_handle_errors:
1323
1324 /* At this point:
1325 * curlen contains the number of bytes in the sequence that
1326 * this call should advance the input by.
e308b348
KW
1327 * avail_len gives the available number of bytes passed in, but
1328 * only if this is less than the expected number of
1329 * bytes, based on the code point's start byte.
2b5e7bc2
KW
1330 * possible_problems' is 0 if there weren't any problems; otherwise a bit
1331 * is set in it for each potential problem found.
1332 * uv contains the code point the input sequence
1333 * represents; or if there is a problem that prevents
1334 * a well-defined value from being computed, it is
1335 * some subsitute value, typically the REPLACEMENT
1336 * CHARACTER.
1337 * s0 points to the first byte of the character
1338 * send points to just after where that (potentially
1339 * partial) character ends
1340 * adjusted_s0 normally is the same as s0, but in case of an
1341 * overlong for which the UTF-8 matters below, it is
1342 * the first byte of the shortest form representation
1343 * of the input.
1344 * adjusted_send normally is the same as 'send', but if adjusted_s0
1345 * is set to something other than s0, this points one
1346 * beyond its end
1347 */
eb83ed87 1348
2b5e7bc2
KW
1349 if (UNLIKELY(possible_problems)) {
1350 bool disallowed = FALSE;
1351 const U32 orig_problems = possible_problems;
1352
1353 while (possible_problems) { /* Handle each possible problem */
1354 UV pack_warn = 0;
1355 char * message = NULL;
1356
1357 /* Each 'if' clause handles one problem. They are ordered so that
1358 * the first ones' messages will be displayed before the later
1359 * ones; this is kinda in decreasing severity order */
1360 if (possible_problems & UTF8_GOT_OVERFLOW) {
1361
1362 /* Overflow means also got a super and above 31 bits, but we
1363 * handle all three cases here */
1364 possible_problems
1365 &= ~(UTF8_GOT_OVERFLOW|UTF8_GOT_SUPER|UTF8_GOT_ABOVE_31_BIT);
f9380377
KW
1366 *errors |= UTF8_GOT_OVERFLOW;
1367
1368 /* But the API says we flag all errors found */
1369 if (flags & (UTF8_WARN_SUPER|UTF8_DISALLOW_SUPER)) {
1370 *errors |= UTF8_GOT_SUPER;
1371 }
ddb65933
KW
1372 if (flags
1373 & (UTF8_WARN_ABOVE_31_BIT|UTF8_DISALLOW_ABOVE_31_BIT))
1374 {
f9380377
KW
1375 *errors |= UTF8_GOT_ABOVE_31_BIT;
1376 }
2b5e7bc2 1377
d60baaa7
KW
1378 /* Disallow if any of the three categories say to */
1379 if ( ! (flags & UTF8_ALLOW_OVERFLOW)
1380 || (flags & ( UTF8_DISALLOW_SUPER
1381 |UTF8_DISALLOW_ABOVE_31_BIT)))
1382 {
1383 disallowed = TRUE;
1384 }
1385
1386
1387 /* Likewise, warn if any say to, plus if deprecation warnings
1388 * are on, because this code point is above IV_MAX */
1389 if ( ckWARN_d(WARN_DEPRECATED)
1390 || ! (flags & UTF8_ALLOW_OVERFLOW)
1391 || (flags & (UTF8_WARN_SUPER|UTF8_WARN_ABOVE_31_BIT)))
1392 {
2b5e7bc2 1393
ddb65933
KW
1394 /* The warnings code explicitly says it doesn't handle the
1395 * case of packWARN2 and two categories which have
1396 * parent-child relationship. Even if it works now to
1397 * raise the warning if either is enabled, it wouldn't
1398 * necessarily do so in the future. We output (only) the
1399 * most dire warning*/
1400 if (! (flags & UTF8_CHECK_ONLY)) {
1401 if (ckWARN_d(WARN_UTF8)) {
1402 pack_warn = packWARN(WARN_UTF8);
1403 }
1404 else if (ckWARN_d(WARN_NON_UNICODE)) {
1405 pack_warn = packWARN(WARN_NON_UNICODE);
1406 }
1407 if (pack_warn) {
1408 message = Perl_form(aTHX_ "%s: %s (overflows)",
1409 malformed_text,
7e2f38b2 1410 _byte_dump_string(s0, send - s0, 0));
ddb65933 1411 }
2b5e7bc2
KW
1412 }
1413 }
1414 }
1415 else if (possible_problems & UTF8_GOT_EMPTY) {
1416 possible_problems &= ~UTF8_GOT_EMPTY;
f9380377 1417 *errors |= UTF8_GOT_EMPTY;
2b5e7bc2
KW
1418
1419 if (! (flags & UTF8_ALLOW_EMPTY)) {
d1f8d421
KW
1420
1421 /* This so-called malformation is now treated as a bug in
1422 * the caller. If you have nothing to decode, skip calling
1423 * this function */
1424 assert(0);
1425
2b5e7bc2
KW
1426 disallowed = TRUE;
1427 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1428 pack_warn = packWARN(WARN_UTF8);
1429 message = Perl_form(aTHX_ "%s (empty string)",
1430 malformed_text);
1431 }
1432 }
1433 }
1434 else if (possible_problems & UTF8_GOT_CONTINUATION) {
1435 possible_problems &= ~UTF8_GOT_CONTINUATION;
f9380377 1436 *errors |= UTF8_GOT_CONTINUATION;
2b5e7bc2
KW
1437
1438 if (! (flags & UTF8_ALLOW_CONTINUATION)) {
1439 disallowed = TRUE;
1440 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1441 pack_warn = packWARN(WARN_UTF8);
1442 message = Perl_form(aTHX_
1443 "%s: %s (unexpected continuation byte 0x%02x,"
1444 " with no preceding start byte)",
1445 malformed_text,
7e2f38b2 1446 _byte_dump_string(s0, 1, 0), *s0);
2b5e7bc2
KW
1447 }
1448 }
1449 }
2b5e7bc2
KW
1450 else if (possible_problems & UTF8_GOT_SHORT) {
1451 possible_problems &= ~UTF8_GOT_SHORT;
f9380377 1452 *errors |= UTF8_GOT_SHORT;
2b5e7bc2
KW
1453
1454 if (! (flags & UTF8_ALLOW_SHORT)) {
1455 disallowed = TRUE;
1456 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1457 pack_warn = packWARN(WARN_UTF8);
1458 message = Perl_form(aTHX_
9a6c9c81 1459 "%s: %s (too short; %d byte%s available, need %d)",
2b5e7bc2 1460 malformed_text,
7e2f38b2 1461 _byte_dump_string(s0, send - s0, 0),
e308b348
KW
1462 (int)avail_len,
1463 avail_len == 1 ? "" : "s",
2b5e7bc2
KW
1464 (int)expectlen);
1465 }
1466 }
ba210ebe 1467
2b5e7bc2 1468 }
e308b348
KW
1469 else if (possible_problems & UTF8_GOT_NON_CONTINUATION) {
1470 possible_problems &= ~UTF8_GOT_NON_CONTINUATION;
1471 *errors |= UTF8_GOT_NON_CONTINUATION;
1472
1473 if (! (flags & UTF8_ALLOW_NON_CONTINUATION)) {
1474 disallowed = TRUE;
1475 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
99a765e9
KW
1476
1477 /* If we don't know for sure that the input length is
1478 * valid, avoid as much as possible reading past the
1479 * end of the buffer */
1480 int printlen = (flags & _UTF8_NO_CONFIDENCE_IN_CURLEN)
1481 ? s - s0
1482 : send - s0;
e308b348
KW
1483 pack_warn = packWARN(WARN_UTF8);
1484 message = Perl_form(aTHX_ "%s",
1485 unexpected_non_continuation_text(s0,
99a765e9 1486 printlen,
e308b348
KW
1487 s - s0,
1488 (int) expectlen));
1489 }
1490 }
1491 }
2b5e7bc2
KW
1492 else if (possible_problems & UTF8_GOT_LONG) {
1493 possible_problems &= ~UTF8_GOT_LONG;
f9380377 1494 *errors |= UTF8_GOT_LONG;
2b5e7bc2 1495
94953955
KW
1496 if (flags & UTF8_ALLOW_LONG) {
1497
1498 /* We don't allow the actual overlong value, unless the
1499 * special extra bit is also set */
1500 if (! (flags & ( UTF8_ALLOW_LONG_AND_ITS_VALUE
1501 & ~UTF8_ALLOW_LONG)))
1502 {
1503 uv = UNICODE_REPLACEMENT;
1504 }
1505 }
1506 else {
2b5e7bc2
KW
1507 disallowed = TRUE;
1508
1509 if (ckWARN_d(WARN_UTF8) && ! (flags & UTF8_CHECK_ONLY)) {
1510 pack_warn = packWARN(WARN_UTF8);
1511
1512 /* These error types cause 'uv' to be something that
1513 * isn't what was intended, so can't use it in the
1514 * message. The other error types either can't
1515 * generate an overlong, or else the 'uv' is valid */
1516 if (orig_problems &
1517 (UTF8_GOT_TOO_SHORT|UTF8_GOT_OVERFLOW))
1518 {
1519 message = Perl_form(aTHX_
1520 "%s: %s (any UTF-8 sequence that starts"
1521 " with \"%s\" is overlong which can and"
1522 " should be represented with a"
1523 " different, shorter sequence)",
1524 malformed_text,
7e2f38b2
KW
1525 _byte_dump_string(s0, send - s0, 0),
1526 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1527 }
1528 else {
1529 U8 tmpbuf[UTF8_MAXBYTES+1];
1530 const U8 * const e = uvoffuni_to_utf8_flags(tmpbuf,
1531 uv, 0);
1532 message = Perl_form(aTHX_
1533 "%s: %s (overlong; instead use %s to represent"
147e3846 1534 " U+%0*" UVXf ")",
2b5e7bc2 1535 malformed_text,
7e2f38b2
KW
1536 _byte_dump_string(s0, send - s0, 0),
1537 _byte_dump_string(tmpbuf, e - tmpbuf, 0),
2b5e7bc2
KW
1538 ((uv < 256) ? 2 : 4), /* Field width of 2 for
1539 small code points */
1540 uv);
1541 }
1542 }
1543 }
1544 }
1545 else if (possible_problems & UTF8_GOT_SURROGATE) {
1546 possible_problems &= ~UTF8_GOT_SURROGATE;
1547
f9380377
KW
1548 if (flags & UTF8_WARN_SURROGATE) {
1549 *errors |= UTF8_GOT_SURROGATE;
1550
1551 if ( ! (flags & UTF8_CHECK_ONLY)
1552 && ckWARN_d(WARN_SURROGATE))
1553 {
2b5e7bc2
KW
1554 pack_warn = packWARN(WARN_SURROGATE);
1555
1556 /* These are the only errors that can occur with a
1557 * surrogate when the 'uv' isn't valid */
1558 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1559 message = Perl_form(aTHX_
1560 "UTF-16 surrogate (any UTF-8 sequence that"
1561 " starts with \"%s\" is for a surrogate)",
7e2f38b2 1562 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1563 }
1564 else {
1565 message = Perl_form(aTHX_
147e3846 1566 "UTF-16 surrogate U+%04" UVXf, uv);
2b5e7bc2 1567 }
f9380377 1568 }
2b5e7bc2 1569 }
ba210ebe 1570
2b5e7bc2
KW
1571 if (flags & UTF8_DISALLOW_SURROGATE) {
1572 disallowed = TRUE;
f9380377 1573 *errors |= UTF8_GOT_SURROGATE;
2b5e7bc2
KW
1574 }
1575 }
1576 else if (possible_problems & UTF8_GOT_SUPER) {
1577 possible_problems &= ~UTF8_GOT_SUPER;
949cf498 1578
f9380377
KW
1579 if (flags & UTF8_WARN_SUPER) {
1580 *errors |= UTF8_GOT_SUPER;
1581
1582 if ( ! (flags & UTF8_CHECK_ONLY)
1583 && ckWARN_d(WARN_NON_UNICODE))
1584 {
2b5e7bc2
KW
1585 pack_warn = packWARN(WARN_NON_UNICODE);
1586
1587 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1588 message = Perl_form(aTHX_
1589 "Any UTF-8 sequence that starts with"
1590 " \"%s\" is for a non-Unicode code point,"
1591 " may not be portable",
7e2f38b2 1592 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1593 }
1594 else {
1595 message = Perl_form(aTHX_
147e3846 1596 "Code point 0x%04" UVXf " is not"
2b5e7bc2
KW
1597 " Unicode, may not be portable",
1598 uv);
1599 }
f9380377 1600 }
2b5e7bc2 1601 }
ba210ebe 1602
2b5e7bc2
KW
1603 /* The maximum code point ever specified by a standard was
1604 * 2**31 - 1. Anything larger than that is a Perl extension
1605 * that very well may not be understood by other applications
1606 * (including earlier perl versions on EBCDIC platforms). We
1607 * test for these after the regular SUPER ones, and before
1608 * possibly bailing out, so that the slightly more dire warning
1609 * will override the regular one. */
1610 if ( (flags & (UTF8_WARN_ABOVE_31_BIT
1611 |UTF8_WARN_SUPER
1612 |UTF8_DISALLOW_ABOVE_31_BIT))
1613 && ( ( UNLIKELY(orig_problems & UTF8_GOT_TOO_SHORT)
1614 && UNLIKELY(is_utf8_cp_above_31_bits(
1615 adjusted_s0,
1616 adjusted_send)))
1617 || ( LIKELY(! (orig_problems & UTF8_GOT_TOO_SHORT))
1618 && UNLIKELY(UNICODE_IS_ABOVE_31_BIT(uv)))))
1619 {
1620 if ( ! (flags & UTF8_CHECK_ONLY)
1621 && (flags & (UTF8_WARN_ABOVE_31_BIT|UTF8_WARN_SUPER))
1622 && ckWARN_d(WARN_UTF8))
1623 {
1624 pack_warn = packWARN(WARN_UTF8);
1625
1626 if (orig_problems & UTF8_GOT_TOO_SHORT) {
1627 message = Perl_form(aTHX_
1628 "Any UTF-8 sequence that starts with"
1629 " \"%s\" is for a non-Unicode code"
1630 " point, and is not portable",
7e2f38b2 1631 _byte_dump_string(s0, curlen, 0));
2b5e7bc2
KW
1632 }
1633 else {
1634 message = Perl_form(aTHX_
147e3846 1635 "Code point 0x%" UVXf " is not Unicode,"
2b5e7bc2
KW
1636 " and not portable",
1637 uv);
1638 }
1639 }
1640
ddb65933
KW
1641 if (flags & ( UTF8_WARN_ABOVE_31_BIT
1642 |UTF8_DISALLOW_ABOVE_31_BIT))
1643 {
f9380377
KW
1644 *errors |= UTF8_GOT_ABOVE_31_BIT;
1645
1646 if (flags & UTF8_DISALLOW_ABOVE_31_BIT) {
1647 disallowed = TRUE;
1648 }
2b5e7bc2
KW
1649 }
1650 }
eb83ed87 1651
2b5e7bc2 1652 if (flags & UTF8_DISALLOW_SUPER) {
f9380377 1653 *errors |= UTF8_GOT_SUPER;
2b5e7bc2
KW
1654 disallowed = TRUE;
1655 }
eb83ed87 1656
2b5e7bc2
KW
1657 /* The deprecated warning overrides any non-deprecated one. If
1658 * there are other problems, a deprecation message is not
1659 * really helpful, so don't bother to raise it in that case.
1660 * This also keeps the code from having to handle the case
1661 * where 'uv' is not valid. */
1662 if ( ! (orig_problems
1663 & (UTF8_GOT_TOO_SHORT|UTF8_GOT_OVERFLOW))
13f4dd34
A
1664 && UNLIKELY(uv > MAX_NON_DEPRECATED_CP)) {
1665 Perl_croak(aTHX_ cp_above_legal_max, uv,
1666 MAX_NON_DEPRECATED_CP);
2b5e7bc2
KW
1667 }
1668 }
1669 else if (possible_problems & UTF8_GOT_NONCHAR) {
1670 possible_problems &= ~UTF8_GOT_NONCHAR;
ba210ebe 1671
f9380377
KW
1672 if (flags & UTF8_WARN_NONCHAR) {
1673 *errors |= UTF8_GOT_NONCHAR;
1674
1675 if ( ! (flags & UTF8_CHECK_ONLY)
1676 && ckWARN_d(WARN_NONCHAR))
1677 {
2b5e7bc2
KW
1678 /* The code above should have guaranteed that we don't
1679 * get here with errors other than overlong */
1680 assert (! (orig_problems
1681 & ~(UTF8_GOT_LONG|UTF8_GOT_NONCHAR)));
1682
1683 pack_warn = packWARN(WARN_NONCHAR);
1684 message = Perl_form(aTHX_ "Unicode non-character"
147e3846 1685 " U+%04" UVXf " is not recommended"
2b5e7bc2 1686 " for open interchange", uv);
f9380377 1687 }
2b5e7bc2 1688 }
5b311467 1689
2b5e7bc2
KW
1690 if (flags & UTF8_DISALLOW_NONCHAR) {
1691 disallowed = TRUE;
f9380377 1692 *errors |= UTF8_GOT_NONCHAR;
2b5e7bc2
KW
1693 }
1694 } /* End of looking through the possible flags */
1695
1696 /* Display the message (if any) for the problem being handled in
1697 * this iteration of the loop */
1698 if (message) {
1699 if (PL_op)
1700 Perl_warner(aTHX_ pack_warn, "%s in %s", message,
1701 OP_DESC(PL_op));
1702 else
1703 Perl_warner(aTHX_ pack_warn, "%s", message);
1704 }
ddb65933 1705 } /* End of 'while (possible_problems)' */
a0dbb045 1706
2b5e7bc2
KW
1707 /* Since there was a possible problem, the returned length may need to
1708 * be changed from the one stored at the beginning of this function.
1709 * Instead of trying to figure out if that's needed, just do it. */
1710 if (retlen) {
1711 *retlen = curlen;
1712 }
a0dbb045 1713
2b5e7bc2
KW
1714 if (disallowed) {
1715 if (flags & UTF8_CHECK_ONLY && retlen) {
1716 *retlen = ((STRLEN) -1);
1717 }
1718 return 0;
1719 }
eb83ed87 1720 }
ba210ebe 1721
2b5e7bc2 1722 return UNI_TO_NATIVE(uv);
a0ed51b3
LW
1723}
1724
8e84507e 1725/*
ec5f19d0
KW
1726=for apidoc utf8_to_uvchr_buf
1727
1728Returns the native code point of the first character in the string C<s> which
1729is assumed to be in UTF-8 encoding; C<send> points to 1 beyond the end of C<s>.
524080c4 1730C<*retlen> will be set to the length, in bytes, of that character.
ec5f19d0 1731
524080c4
KW
1732If C<s> does not point to a well-formed UTF-8 character and UTF8 warnings are
1733enabled, zero is returned and C<*retlen> is set (if C<retlen> isn't
796b6530 1734C<NULL>) to -1. If those warnings are off, the computed value, if well-defined
173db420 1735(or the Unicode REPLACEMENT CHARACTER if not), is silently returned, and
796b6530 1736C<*retlen> is set (if C<retlen> isn't C<NULL>) so that (S<C<s> + C<*retlen>>) is
173db420 1737the next possible position in C<s> that could begin a non-malformed character.
de69f3af 1738See L</utf8n_to_uvchr> for details on when the REPLACEMENT CHARACTER is
173db420 1739returned.
ec5f19d0 1740
760c7c2f
KW
1741Code points above the platform's C<IV_MAX> will raise a deprecation warning,
1742unless those are turned off.
1743
ec5f19d0 1744=cut
52be2536
KW
1745
1746Also implemented as a macro in utf8.h
1747
ec5f19d0
KW
1748*/
1749
1750
1751UV
1752Perl_utf8_to_uvchr_buf(pTHX_ const U8 *s, const U8 *send, STRLEN *retlen)
1753{
7f974d7e
KW
1754 PERL_ARGS_ASSERT_UTF8_TO_UVCHR_BUF;
1755
ec5f19d0
KW
1756 assert(s < send);
1757
1758 return utf8n_to_uvchr(s, send - s, retlen,
ddb65933 1759 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY);
ec5f19d0
KW
1760}
1761
52be2536
KW
1762/* This is marked as deprecated
1763 *
ec5f19d0
KW
1764=for apidoc utf8_to_uvuni_buf
1765
de69f3af
KW
1766Only in very rare circumstances should code need to be dealing in Unicode
1767(as opposed to native) code points. In those few cases, use
1768C<L<NATIVE_TO_UNI(utf8_to_uvchr_buf(...))|/utf8_to_uvchr_buf>> instead.
4f83cdcd
KW
1769
1770Returns the Unicode (not-native) code point of the first character in the
1771string C<s> which
ec5f19d0
KW
1772is assumed to be in UTF-8 encoding; C<send> points to 1 beyond the end of C<s>.
1773C<retlen> will be set to the length, in bytes, of that character.
1774
524080c4
KW
1775If C<s> does not point to a well-formed UTF-8 character and UTF8 warnings are
1776enabled, zero is returned and C<*retlen> is set (if C<retlen> isn't
1777NULL) to -1. If those warnings are off, the computed value if well-defined (or
1778the Unicode REPLACEMENT CHARACTER, if not) is silently returned, and C<*retlen>
1779is set (if C<retlen> isn't NULL) so that (S<C<s> + C<*retlen>>) is the
1780next possible position in C<s> that could begin a non-malformed character.
de69f3af 1781See L</utf8n_to_uvchr> for details on when the REPLACEMENT CHARACTER is returned.
ec5f19d0 1782
760c7c2f
KW
1783Code points above the platform's C<IV_MAX> will raise a deprecation warning,
1784unless those are turned off.
1785
ec5f19d0
KW
1786=cut
1787*/
1788
1789UV
1790Perl_utf8_to_uvuni_buf(pTHX_ const U8 *s, const U8 *send, STRLEN *retlen)
1791{
1792 PERL_ARGS_ASSERT_UTF8_TO_UVUNI_BUF;
1793
1794 assert(send > s);
1795
5962d97e
KW
1796 /* Call the low level routine, asking for checks */
1797 return NATIVE_TO_UNI(utf8_to_uvchr_buf(s, send, retlen));
ec5f19d0
KW
1798}
1799
b76347f2 1800/*
87cea99e 1801=for apidoc utf8_length
b76347f2
JH
1802
1803Return the length of the UTF-8 char encoded string C<s> in characters.
02eb7b47
JH
1804Stops at C<e> (inclusive). If C<e E<lt> s> or if the scan would end
1805up past C<e>, croaks.
b76347f2
JH
1806
1807=cut
1808*/
1809
1810STRLEN
35a4481c 1811Perl_utf8_length(pTHX_ const U8 *s, const U8 *e)
b76347f2
JH
1812{
1813 STRLEN len = 0;
1814
7918f24d
NC
1815 PERL_ARGS_ASSERT_UTF8_LENGTH;
1816
8850bf83
JH
1817 /* Note: cannot use UTF8_IS_...() too eagerly here since e.g.
1818 * the bitops (especially ~) can create illegal UTF-8.
1819 * In other words: in Perl UTF-8 is not just for Unicode. */
1820
a3b680e6
AL
1821 if (e < s)
1822 goto warn_and_return;
b76347f2 1823 while (s < e) {
4cbf4130 1824 s += UTF8SKIP(s);
8e91ec7f
AV
1825 len++;
1826 }
1827
1828 if (e != s) {
1829 len--;
1830 warn_and_return:
9b387841
NC
1831 if (PL_op)
1832 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
1833 "%s in %s", unees, OP_DESC(PL_op));
1834 else
61a12c31 1835 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "%s", unees);
b76347f2
JH
1836 }
1837
1838 return len;
1839}
1840
b06226ff 1841/*
fed3ba5d
NC
1842=for apidoc bytes_cmp_utf8
1843
a1433954 1844Compares the sequence of characters (stored as octets) in C<b>, C<blen> with the
72d33970
FC
1845sequence of characters (stored as UTF-8)
1846in C<u>, C<ulen>. Returns 0 if they are
fed3ba5d
NC
1847equal, -1 or -2 if the first string is less than the second string, +1 or +2
1848if the first string is greater than the second string.
1849
1850-1 or +1 is returned if the shorter string was identical to the start of the
72d33970
FC
1851longer string. -2 or +2 is returned if
1852there was a difference between characters
fed3ba5d
NC
1853within the strings.
1854
1855=cut
1856*/
1857
1858int
1859Perl_bytes_cmp_utf8(pTHX_ const U8 *b, STRLEN blen, const U8 *u, STRLEN ulen)
1860{
1861 const U8 *const bend = b + blen;
1862 const U8 *const uend = u + ulen;
1863
1864 PERL_ARGS_ASSERT_BYTES_CMP_UTF8;
fed3ba5d
NC
1865
1866 while (b < bend && u < uend) {
1867 U8 c = *u++;
1868 if (!UTF8_IS_INVARIANT(c)) {
1869 if (UTF8_IS_DOWNGRADEABLE_START(c)) {
1870 if (u < uend) {
1871 U8 c1 = *u++;
1872 if (UTF8_IS_CONTINUATION(c1)) {
a62b247b 1873 c = EIGHT_BIT_UTF8_TO_NATIVE(c, c1);
fed3ba5d 1874 } else {
2b5e7bc2 1875 /* diag_listed_as: Malformed UTF-8 character%s */
fed3ba5d 1876 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
806547a7 1877 "%s %s%s",
1d5030e1 1878 unexpected_non_continuation_text(u - 2, 2, 1, 2),
806547a7
KW
1879 PL_op ? " in " : "",
1880 PL_op ? OP_DESC(PL_op) : "");
fed3ba5d
NC
1881 return -2;
1882 }
1883 } else {
1884 if (PL_op)
1885 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
1886 "%s in %s", unees, OP_DESC(PL_op));
1887 else
61a12c31 1888 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "%s", unees);
fed3ba5d
NC
1889 return -2; /* Really want to return undef :-) */
1890 }
1891 } else {
1892 return -2;
1893 }
1894 }
1895 if (*b != c) {
1896 return *b < c ? -2 : +2;
1897 }
1898 ++b;
1899 }
1900
1901 if (b == bend && u == uend)
1902 return 0;
1903
1904 return b < bend ? +1 : -1;
1905}
1906
1907/*
87cea99e 1908=for apidoc utf8_to_bytes
6940069f 1909
3bc0c78c 1910Converts a string C<"s"> of length C<*lenp> from UTF-8 into native byte encoding.
a1433954 1911Unlike L</bytes_to_utf8>, this over-writes the original string, and
09af0336 1912updates C<*lenp> to contain the new length.
3bc0c78c
KW
1913Returns zero on failure (leaving C<"s"> unchanged) setting C<*lenp> to -1.
1914
1915Upon successful return, the number of variants in the string can be computed by
23b37b12
KW
1916having saved the value of C<*lenp> before the call, and subtracting the
1917after-call value of C<*lenp> from it.
6940069f 1918
a1433954 1919If you need a copy of the string, see L</bytes_from_utf8>.
95be277c 1920
6940069f
GS
1921=cut
1922*/
1923
1924U8 *
09af0336 1925Perl_utf8_to_bytes(pTHX_ U8 *s, STRLEN *lenp)
6940069f 1926{
9fe0d3c2 1927 U8 * first_variant;
246fae53 1928
7918f24d 1929 PERL_ARGS_ASSERT_UTF8_TO_BYTES;
81611534 1930 PERL_UNUSED_CONTEXT;
7918f24d 1931
9fe0d3c2 1932 /* This is a no-op if no variants at all in the input */
09af0336 1933 if (is_utf8_invariant_string_loc(s, *lenp, (const U8 **) &first_variant)) {
9fe0d3c2
KW
1934 return s;
1935 }
1936
1937 {
3c5aa262 1938 U8 * const save = s;
09af0336 1939 U8 * const send = s + *lenp;
3c5aa262
KW
1940 U8 * d;
1941
1942 /* Nothing before the first variant needs to be changed, so start the real
1943 * work there */
1944 s = first_variant;
1945 while (s < send) {
1946 if (! UTF8_IS_INVARIANT(*s)) {
1947 if (! UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, send)) {
09af0336 1948 *lenp = ((STRLEN) -1);
3c5aa262
KW
1949 return 0;
1950 }
1951 s++;
d59937ca
KW
1952 }
1953 s++;
dcad2880 1954 }
dcad2880 1955
3c5aa262
KW
1956 /* Is downgradable, so do it */
1957 d = s = first_variant;
1958 while (s < send) {
1959 U8 c = *s++;
1960 if (! UVCHR_IS_INVARIANT(c)) {
1961 /* Then it is two-byte encoded */
1962 c = EIGHT_BIT_UTF8_TO_NATIVE(c, *s);
1963 s++;
1964 }
1965 *d++ = c;
1966 }
1967 *d = '\0';
09af0336 1968 *lenp = d - save;
3c5aa262
KW
1969
1970 return save;
9fe0d3c2 1971 }
6940069f
GS
1972}
1973
1974/*
87cea99e 1975=for apidoc bytes_from_utf8
f9a63242 1976
09af0336 1977Converts a potentially UTF-8 encoded string C<s> of length C<*lenp> into native
41ae6089 1978byte encoding. On input, the boolean C<*is_utf8p> gives whether or not C<s> is
4f3d592d
KW
1979actually encoded in UTF-8.
1980
1981Unlike L</utf8_to_bytes> but like L</bytes_to_utf8>, this is non-destructive of
1982the input string.
1983
41ae6089
KW
1984Do nothing if C<*is_utf8p> is 0, or if there are code points in the string
1985not expressible in native byte encoding. In these cases, C<*is_utf8p> and
09af0336 1986C<*lenp> are unchanged, and the return value is the original C<s>.
4f3d592d 1987
41ae6089 1988Otherwise, C<*is_utf8p> is set to 0, and the return value is a pointer to a
4f3d592d 1989newly created string containing a downgraded copy of C<s>, and whose length is
23b37b12 1990returned in C<*lenp>, updated. The new string is C<NUL>-terminated.
f9a63242 1991
3bc0c78c 1992Upon successful return, the number of variants in the string can be computed by
23b37b12
KW
1993having saved the value of C<*lenp> before the call, and subtracting the
1994after-call value of C<*lenp> from it.
3bc0c78c 1995
37607a96 1996=cut
976c1b08
KW
1997
1998There is a macro that avoids this function call, but this is retained for
1999anyone who calls it with the Perl_ prefix */
f9a63242
JH
2000
2001U8 *
41ae6089 2002Perl_bytes_from_utf8(pTHX_ const U8 *s, STRLEN *lenp, bool *is_utf8p)
f9a63242 2003{
7918f24d 2004 PERL_ARGS_ASSERT_BYTES_FROM_UTF8;
96a5add6 2005 PERL_UNUSED_CONTEXT;
f9a63242 2006
976c1b08
KW
2007 return bytes_from_utf8_loc(s, lenp, is_utf8p, NULL);
2008}
2009
2010/*
2011No = here because currently externally undocumented
2012for apidoc bytes_from_utf8_loc
2013
2014Like C<L</bytes_from_utf8>()>, but takes an extra parameter, a pointer to where
2015to store the location of the first character in C<"s"> that cannot be
2016converted to non-UTF8.
2017
2018If that parameter is C<NULL>, this function behaves identically to
2019C<bytes_from_utf8>.
2020
2021Otherwise if C<*is_utf8p> is 0 on input, the function behaves identically to
2022C<bytes_from_utf8>, except it also sets C<*first_non_downgradable> to C<NULL>.
2023
2024Otherwise, the function returns a newly created C<NUL>-terminated string
2025containing the non-UTF8 equivalent of the convertible first portion of
2026C<"s">. C<*lenp> is set to its length, not including the terminating C<NUL>.
2027If the entire input string was converted, C<*is_utf8p> is set to a FALSE value,
2028and C<*first_non_downgradable> is set to C<NULL>.
2029
2030Otherwise, C<*first_non_downgradable> set to point to the first byte of the
2031first character in the original string that wasn't converted. C<*is_utf8p> is
2032unchanged. Note that the new string may have length 0.
2033
2034Another way to look at it is, if C<*first_non_downgradable> is non-C<NULL> and
2035C<*is_utf8p> is TRUE, this function starts at the beginning of C<"s"> and
2036converts as many characters in it as possible stopping at the first one it
385b74be 2037finds that can't be converted to non-UTF-8. C<*first_non_downgradable> is
976c1b08
KW
2038set to point to that. The function returns the portion that could be converted
2039in a newly created C<NUL>-terminated string, and C<*lenp> is set to its length,
2040not including the terminating C<NUL>. If the very first character in the
2041original could not be converted, C<*lenp> will be 0, and the new string will
2042contain just a single C<NUL>. If the entire input string was converted,
2043C<*is_utf8p> is set to FALSE and C<*first_non_downgradable> is set to C<NULL>.
2044
2045Upon successful return, the number of variants in the converted portion of the
2046string can be computed by having saved the value of C<*lenp> before the call,
2047and subtracting the after-call value of C<*lenp> from it.
2048
2049=cut
2050
2051
2052*/
2053
2054U8 *
2055Perl_bytes_from_utf8_loc(const U8 *s, STRLEN *lenp, bool *is_utf8p, const U8** first_unconverted)
2056{
2057 U8 *d;
2058 const U8 *original = s;
2059 U8 *converted_start;
2060 const U8 *send = s + *lenp;
f9a63242 2061
976c1b08 2062 PERL_ARGS_ASSERT_BYTES_FROM_UTF8_LOC;
170a1c22 2063
976c1b08
KW
2064 if (! *is_utf8p) {
2065 if (first_unconverted) {
2066 *first_unconverted = NULL;
2067 }
2068
2069 return (U8 *) original;
2070 }
2071
2072 Newx(d, (*lenp) + 1, U8);
2073
2074 converted_start = d;
7299a045
KW
2075 while (s < send) {
2076 U8 c = *s++;
2077 if (! UTF8_IS_INVARIANT(c)) {
976c1b08
KW
2078
2079 /* Then it is multi-byte encoded. If the code point is above 0xFF,
2080 * have to stop now */
2081 if (UNLIKELY (! UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s - 1, send))) {
2082 if (first_unconverted) {
2083 *first_unconverted = s - 1;
2084 goto finish_and_return;
2085 }
2086 else {
2087 Safefree(converted_start);
2088 return (U8 *) original;
2089 }
2090 }
2091
7299a045
KW
2092 c = EIGHT_BIT_UTF8_TO_NATIVE(c, *s);
2093 s++;
38af28cf 2094 }
7299a045
KW
2095 *d++ = c;
2096 }
170a1c22 2097
976c1b08
KW
2098 /* Here, converted the whole of the input */
2099 *is_utf8p = FALSE;
2100 if (first_unconverted) {
2101 *first_unconverted = NULL;
170a1c22 2102 }
976c1b08
KW
2103
2104 finish_and_return:
2105 *d = '\0';
2106 *lenp = d - converted_start;
2107
2108 /* Trim unused space */
2109 Renew(converted_start, *lenp + 1, U8);
2110
2111 return converted_start;
f9a63242
JH
2112}
2113
2114/*
87cea99e 2115=for apidoc bytes_to_utf8
6940069f 2116
09af0336 2117Converts a string C<s> of length C<*lenp> bytes from the native encoding into
ff97e5cf 2118UTF-8.
09af0336 2119Returns a pointer to the newly-created string, and sets C<*lenp> to
ff97e5cf 2120reflect the new length in bytes.
6940069f 2121
3bc0c78c 2122Upon successful return, the number of variants in the string can be computed by
23b37b12 2123having saved the value of C<*lenp> before the call, and subtracting it from the
3bc0c78c
KW
2124after-call value of C<*lenp>.
2125
75200dff 2126A C<NUL> character will be written after the end of the string.
2bbc8d55
SP
2127
2128If you want to convert to UTF-8 from encodings other than
2129the native (Latin1 or EBCDIC),
a1433954 2130see L</sv_recode_to_utf8>().
c9ada85f 2131
497711e7 2132=cut
6940069f
GS
2133*/
2134
2135U8*
09af0336 2136Perl_bytes_to_utf8(pTHX_ const U8 *s, STRLEN *lenp)
6940069f 2137{
09af0336 2138 const U8 * const send = s + (*lenp);
6940069f
GS
2139 U8 *d;
2140 U8 *dst;
7918f24d
NC
2141
2142 PERL_ARGS_ASSERT_BYTES_TO_UTF8;
96a5add6 2143 PERL_UNUSED_CONTEXT;
6940069f 2144
09af0336 2145 Newx(d, (*lenp) * 2 + 1, U8);
6940069f
GS
2146 dst = d;
2147
2148 while (s < send) {
55d09dc8
KW
2149 append_utf8_from_native_byte(*s, &d);
2150 s++;
6940069f
GS
2151 }
2152 *d = '\0';
09af0336 2153 *lenp = d-dst;
6940069f
GS
2154 return dst;
2155}
2156
a0ed51b3 2157/*
dea0fc0b 2158 * Convert native (big-endian) or reversed (little-endian) UTF-16 to UTF-8.
a0ed51b3
LW
2159 *
2160 * Destination must be pre-extended to 3/2 source. Do not use in-place.
2161 * We optimize for native, for obvious reasons. */
2162
2163U8*
dea0fc0b 2164Perl_utf16_to_utf8(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
a0ed51b3 2165{
dea0fc0b
JH
2166 U8* pend;
2167 U8* dstart = d;
2168
7918f24d
NC
2169 PERL_ARGS_ASSERT_UTF16_TO_UTF8;
2170
dea0fc0b 2171 if (bytelen & 1)
147e3846 2172 Perl_croak(aTHX_ "panic: utf16_to_utf8: odd bytelen %" UVuf, (UV)bytelen);
dea0fc0b
JH
2173
2174 pend = p + bytelen;
2175
a0ed51b3 2176 while (p < pend) {
dea0fc0b
JH
2177 UV uv = (p[0] << 8) + p[1]; /* UTF-16BE */
2178 p += 2;
2d1545e5 2179 if (OFFUNI_IS_INVARIANT(uv)) {
56d37426 2180 *d++ = LATIN1_TO_NATIVE((U8) uv);
a0ed51b3
LW
2181 continue;
2182 }
56d37426
KW
2183 if (uv <= MAX_UTF8_TWO_BYTE) {
2184 *d++ = UTF8_TWO_BYTE_HI(UNI_TO_NATIVE(uv));
2185 *d++ = UTF8_TWO_BYTE_LO(UNI_TO_NATIVE(uv));
a0ed51b3
LW
2186 continue;
2187 }
46956fad
KW
2188#define FIRST_HIGH_SURROGATE UNICODE_SURROGATE_FIRST
2189#define LAST_HIGH_SURROGATE 0xDBFF
2190#define FIRST_LOW_SURROGATE 0xDC00
2191#define LAST_LOW_SURROGATE UNICODE_SURROGATE_LAST
e23c50db
KW
2192
2193 /* This assumes that most uses will be in the first Unicode plane, not
2194 * needing surrogates */
2195 if (UNLIKELY(uv >= UNICODE_SURROGATE_FIRST
2196 && uv <= UNICODE_SURROGATE_LAST))
2197 {
2198 if (UNLIKELY(p >= pend) || UNLIKELY(uv > LAST_HIGH_SURROGATE)) {
2199 Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
2200 }
2201 else {
01ea242b 2202 UV low = (p[0] << 8) + p[1];
e23c50db
KW
2203 if ( UNLIKELY(low < FIRST_LOW_SURROGATE)
2204 || UNLIKELY(low > LAST_LOW_SURROGATE))
2205 {
01ea242b 2206 Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
e23c50db
KW
2207 }
2208 p += 2;
46956fad
KW
2209 uv = ((uv - FIRST_HIGH_SURROGATE) << 10)
2210 + (low - FIRST_LOW_SURROGATE) + 0x10000;
01ea242b 2211 }
a0ed51b3 2212 }
56d37426
KW
2213#ifdef EBCDIC
2214 d = uvoffuni_to_utf8_flags(d, uv, 0);
2215#else
a0ed51b3 2216 if (uv < 0x10000) {
eb160463
GS
2217 *d++ = (U8)(( uv >> 12) | 0xe0);
2218 *d++ = (U8)(((uv >> 6) & 0x3f) | 0x80);
2219 *d++ = (U8)(( uv & 0x3f) | 0x80);
a0ed51b3
LW
2220 continue;
2221 }
2222 else {
eb160463
GS
2223 *d++ = (U8)(( uv >> 18) | 0xf0);
2224 *d++ = (U8)(((uv >> 12) & 0x3f) | 0x80);
2225 *d++ = (U8)(((uv >> 6) & 0x3f) | 0x80);
2226 *d++ = (U8)(( uv & 0x3f) | 0x80);
a0ed51b3
LW
2227 continue;
2228 }
56d37426 2229#endif
a0ed51b3 2230 }
dea0fc0b 2231 *newlen = d - dstart;
a0ed51b3
LW
2232 return d;
2233}
2234
2235/* Note: this one is slightly destructive of the source. */
2236
2237U8*
dea0fc0b 2238Perl_utf16_to_utf8_reversed(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
a0ed51b3
LW
2239{
2240 U8* s = (U8*)p;
d4c19fe8 2241 U8* const send = s + bytelen;
7918f24d
NC
2242
2243 PERL_ARGS_ASSERT_UTF16_TO_UTF8_REVERSED;
2244
e0ea5e2d 2245 if (bytelen & 1)
147e3846 2246 Perl_croak(aTHX_ "panic: utf16_to_utf8_reversed: odd bytelen %" UVuf,
e0ea5e2d
NC
2247 (UV)bytelen);
2248
a0ed51b3 2249 while (s < send) {
d4c19fe8 2250 const U8 tmp = s[0];
a0ed51b3
LW
2251 s[0] = s[1];
2252 s[1] = tmp;
2253 s += 2;
2254 }
dea0fc0b 2255 return utf16_to_utf8(p, d, bytelen, newlen);
a0ed51b3
LW
2256}
2257
922e8cb4
KW
2258bool
2259Perl__is_uni_FOO(pTHX_ const U8 classnum, const UV c)
2260{
2261 U8 tmpbuf[UTF8_MAXBYTES+1];
2262 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2263 return _is_utf8_FOO_with_len(classnum, tmpbuf, tmpbuf + sizeof(tmpbuf));
922e8cb4
KW
2264}
2265
f9ae8fb6
JD
2266/* Internal function so we can deprecate the external one, and call
2267 this one from other deprecated functions in this file */
2268
f2645549
KW
2269bool
2270Perl__is_utf8_idstart(pTHX_ const U8 *p)
61b19385 2271{
f2645549 2272 PERL_ARGS_ASSERT__IS_UTF8_IDSTART;
61b19385
KW
2273
2274 if (*p == '_')
2275 return TRUE;
f25ce844 2276 return is_utf8_common(p, &PL_utf8_idstart, "IdStart", NULL);
61b19385
KW
2277}
2278
5092f92a 2279bool
eba68aa0
KW
2280Perl__is_uni_perl_idcont(pTHX_ UV c)
2281{
2282 U8 tmpbuf[UTF8_MAXBYTES+1];
2283 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2284 return _is_utf8_perl_idcont_with_len(tmpbuf, tmpbuf + sizeof(tmpbuf));
eba68aa0
KW
2285}
2286
2287bool
f91dcd13
KW
2288Perl__is_uni_perl_idstart(pTHX_ UV c)
2289{
2290 U8 tmpbuf[UTF8_MAXBYTES+1];
2291 uvchr_to_utf8(tmpbuf, c);
da8c1a98 2292 return _is_utf8_perl_idstart_with_len(tmpbuf, tmpbuf + sizeof(tmpbuf));
f91dcd13
KW
2293}
2294
3a4c58c9
KW
2295UV
2296Perl__to_upper_title_latin1(pTHX_ const U8 c, U8* p, STRLEN *lenp, const char S_or_s)
2297{
2298 /* We have the latin1-range values compiled into the core, so just use
4a4088c4 2299 * those, converting the result to UTF-8. The only difference between upper
3a4c58c9
KW
2300 * and title case in this range is that LATIN_SMALL_LETTER_SHARP_S is
2301 * either "SS" or "Ss". Which one to use is passed into the routine in
2302 * 'S_or_s' to avoid a test */
2303
2304 UV converted = toUPPER_LATIN1_MOD(c);
2305
2306 PERL_ARGS_ASSERT__TO_UPPER_TITLE_LATIN1;
2307
2308 assert(S_or_s == 'S' || S_or_s == 's');
2309
6f2d5cbc 2310 if (UVCHR_IS_INVARIANT(converted)) { /* No difference between the two for
f4cd282c 2311 characters in this range */
3a4c58c9
KW
2312 *p = (U8) converted;
2313 *lenp = 1;
2314 return converted;
2315 }
2316
2317 /* toUPPER_LATIN1_MOD gives the correct results except for three outliers,
2318 * which it maps to one of them, so as to only have to have one check for
2319 * it in the main case */
2320 if (UNLIKELY(converted == LATIN_SMALL_LETTER_Y_WITH_DIAERESIS)) {
2321 switch (c) {
2322 case LATIN_SMALL_LETTER_Y_WITH_DIAERESIS:
2323 converted = LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS;
2324 break;
2325 case MICRO_SIGN:
2326 converted = GREEK_CAPITAL_LETTER_MU;
2327 break;
79e064b9
KW
2328#if UNICODE_MAJOR_VERSION > 2 \
2329 || (UNICODE_MAJOR_VERSION == 2 && UNICODE_DOT_VERSION >= 1 \
2330 && UNICODE_DOT_DOT_VERSION >= 8)
3a4c58c9
KW
2331 case LATIN_SMALL_LETTER_SHARP_S:
2332 *(p)++ = 'S';
2333 *p = S_or_s;
2334 *lenp = 2;
2335 return 'S';
79e064b9 2336#endif
3a4c58c9
KW
2337 default:
2338 Perl_croak(aTHX_ "panic: to_upper_title_latin1 did not expect '%c' to map to '%c'", c, LATIN_SMALL_LETTER_Y_WITH_DIAERESIS);
e5964223 2339 NOT_REACHED; /* NOTREACHED */
3a4c58c9
KW
2340 }
2341 }
2342
2343 *(p)++ = UTF8_TWO_BYTE_HI(converted);
2344 *p = UTF8_TWO_BYTE_LO(converted);
2345 *lenp = 2;
2346
2347 return converted;
2348}
2349
50bda2c3
KW
2350/* Call the function to convert a UTF-8 encoded character to the specified case.
2351 * Note that there may be more than one character in the result.
2352 * INP is a pointer to the first byte of the input character
2353 * OUTP will be set to the first byte of the string of changed characters. It
2354 * needs to have space for UTF8_MAXBYTES_CASE+1 bytes
2355 * LENP will be set to the length in bytes of the string of changed characters
2356 *
2357 * The functions return the ordinal of the first character in the string of OUTP */
b9992569
KW
2358#define CALL_UPPER_CASE(uv, s, d, lenp) _to_utf8_case(uv, s, d, lenp, &PL_utf8_toupper, "ToUc", "")
2359#define CALL_TITLE_CASE(uv, s, d, lenp) _to_utf8_case(uv, s, d, lenp, &PL_utf8_totitle, "ToTc", "")
2360#define CALL_LOWER_CASE(uv, s, d, lenp) _to_utf8_case(uv, s, d, lenp, &PL_utf8_tolower, "ToLc", "")
50bda2c3 2361
b9992569
KW
2362/* This additionally has the input parameter 'specials', which if non-zero will
2363 * cause this to use the specials hash for folding (meaning get full case
50bda2c3 2364 * folding); otherwise, when zero, this implies a simple case fold */
b9992569 2365#define CALL_FOLD_CASE(uv, s, d, lenp, specials) _to_utf8_case(uv, s, d, lenp, &PL_utf8_tofold, "ToCf", (specials) ? "" : NULL)
c3fd2246 2366
84afefe6
JH
2367UV
2368Perl_to_uni_upper(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2369{
a1433954
KW
2370 /* Convert the Unicode character whose ordinal is <c> to its uppercase
2371 * version and store that in UTF-8 in <p> and its length in bytes in <lenp>.
2372 * Note that the <p> needs to be at least UTF8_MAXBYTES_CASE+1 bytes since
c3fd2246
KW
2373 * the changed version may be longer than the original character.
2374 *
2375 * The ordinal of the first character of the changed version is returned
2376 * (but note, as explained above, that there may be more.) */
2377
7918f24d
NC
2378 PERL_ARGS_ASSERT_TO_UNI_UPPER;
2379
3a4c58c9
KW
2380 if (c < 256) {
2381 return _to_upper_title_latin1((U8) c, p, lenp, 'S');
2382 }
2383
0ebc6274 2384 uvchr_to_utf8(p, c);
b9992569 2385 return CALL_UPPER_CASE(c, p, p, lenp);
a0ed51b3
LW
2386}
2387
84afefe6
JH
2388UV
2389Perl_to_uni_title(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2390{
7918f24d
NC
2391 PERL_ARGS_ASSERT_TO_UNI_TITLE;
2392
3a4c58c9
KW
2393 if (c < 256) {
2394 return _to_upper_title_latin1((U8) c, p, lenp, 's');
2395 }
2396
0ebc6274 2397 uvchr_to_utf8(p, c);
b9992569 2398 return CALL_TITLE_CASE(c, p, p, lenp);
a0ed51b3
LW
2399}
2400
afc16117 2401STATIC U8
eaf412bf 2402S_to_lower_latin1(const U8 c, U8* p, STRLEN *lenp, const char dummy)
afc16117
KW
2403{
2404 /* We have the latin1-range values compiled into the core, so just use
4a4088c4 2405 * those, converting the result to UTF-8. Since the result is always just
a1433954 2406 * one character, we allow <p> to be NULL */
afc16117
KW
2407
2408 U8 converted = toLOWER_LATIN1(c);
2409
eaf412bf
KW
2410 PERL_UNUSED_ARG(dummy);
2411
afc16117 2412 if (p != NULL) {
6f2d5cbc 2413 if (NATIVE_BYTE_IS_INVARIANT(converted)) {
afc16117
KW
2414 *p = converted;
2415 *lenp = 1;
2416 }
2417 else {
430c9760
KW
2418 /* Result is known to always be < 256, so can use the EIGHT_BIT
2419 * macros */
2420 *p = UTF8_EIGHT_BIT_HI(converted);
2421 *(p+1) = UTF8_EIGHT_BIT_LO(converted);
afc16117
KW
2422 *lenp = 2;
2423 }
2424 }
2425 return converted;
2426}
2427
84afefe6
JH
2428UV
2429Perl_to_uni_lower(pTHX_ UV c, U8* p, STRLEN *lenp)
a0ed51b3 2430{
7918f24d
NC
2431 PERL_ARGS_ASSERT_TO_UNI_LOWER;
2432
afc16117 2433 if (c < 256) {
eaf412bf 2434 return to_lower_latin1((U8) c, p, lenp, 0 /* 0 is a dummy arg */ );
bca00c02
KW
2435 }
2436
afc16117 2437 uvchr_to_utf8(p, c);
b9992569 2438 return CALL_LOWER_CASE(c, p, p, lenp);
a0ed51b3
LW
2439}
2440
84afefe6 2441UV
51910141 2442Perl__to_fold_latin1(pTHX_ const U8 c, U8* p, STRLEN *lenp, const unsigned int flags)
a1dde8de 2443{
51910141 2444 /* Corresponds to to_lower_latin1(); <flags> bits meanings:
1ca267a5 2445 * FOLD_FLAGS_NOMIX_ASCII iff non-ASCII to ASCII folds are prohibited
51910141 2446 * FOLD_FLAGS_FULL iff full folding is to be used;
1ca267a5
KW
2447 *
2448 * Not to be used for locale folds
51910141 2449 */
f673fad4 2450
a1dde8de
KW
2451 UV converted;
2452
2453 PERL_ARGS_ASSERT__TO_FOLD_LATIN1;
81611534 2454 PERL_UNUSED_CONTEXT;
a1dde8de 2455
1ca267a5
KW
2456 assert (! (flags & FOLD_FLAGS_LOCALE));
2457
659a7c2d 2458 if (UNLIKELY(c == MICRO_SIGN)) {
a1dde8de
KW
2459 converted = GREEK_SMALL_LETTER_MU;
2460 }
9b63e895
KW
2461#if UNICODE_MAJOR_VERSION > 3 /* no multifolds in early Unicode */ \
2462 || (UNICODE_MAJOR_VERSION == 3 && ( UNICODE_DOT_VERSION > 0) \
2463 || UNICODE_DOT_DOT_VERSION > 0)
659a7c2d
KW
2464 else if ( (flags & FOLD_FLAGS_FULL)
2465 && UNLIKELY(c == LATIN_SMALL_LETTER_SHARP_S))
2466 {
1ca267a5
KW
2467 /* If can't cross 127/128 boundary, can't return "ss"; instead return
2468 * two U+017F characters, as fc("\df") should eq fc("\x{17f}\x{17f}")
2469 * under those circumstances. */
2470 if (flags & FOLD_FLAGS_NOMIX_ASCII) {
2471 *lenp = 2 * sizeof(LATIN_SMALL_LETTER_LONG_S_UTF8) - 2;
2472 Copy(LATIN_SMALL_LETTER_LONG_S_UTF8 LATIN_SMALL_LETTER_LONG_S_UTF8,
2473 p, *lenp, U8);
2474 return LATIN_SMALL_LETTER_LONG_S;
2475 }
2476 else {
4f489194
KW
2477 *(p)++ = 's';
2478 *p = 's';
2479 *lenp = 2;
2480 return 's';
1ca267a5 2481 }
a1dde8de 2482 }
9b63e895 2483#endif
a1dde8de
KW
2484 else { /* In this range the fold of all other characters is their lower
2485 case */
2486 converted = toLOWER_LATIN1(c);
2487 }
2488
6f2d5cbc 2489 if (UVCHR_IS_INVARIANT(converted)) {
a1dde8de
KW
2490 *p = (U8) converted;
2491 *lenp = 1;
2492 }
2493 else {
2494 *(p)++ = UTF8_TWO_BYTE_HI(converted);
2495 *p = UTF8_TWO_BYTE_LO(converted);
2496 *lenp = 2;
2497 }
2498
2499 return converted;
2500}
2501
2502UV
31f05a37 2503Perl__to_uni_fold_flags(pTHX_ UV c, U8* p, STRLEN *lenp, U8 flags)
84afefe6 2504{
4b593389 2505
a0270393
KW
2506 /* Not currently externally documented, and subject to change
2507 * <flags> bits meanings:
2508 * FOLD_FLAGS_FULL iff full folding is to be used;
31f05a37
KW
2509 * FOLD_FLAGS_LOCALE is set iff the rules from the current underlying
2510 * locale are to be used.
a0270393
KW
2511 * FOLD_FLAGS_NOMIX_ASCII iff non-ASCII to ASCII folds are prohibited
2512 */
4b593389 2513
36bb2ab6 2514 PERL_ARGS_ASSERT__TO_UNI_FOLD_FLAGS;
7918f24d 2515
780fcc9f
KW
2516 if (flags & FOLD_FLAGS_LOCALE) {
2517 /* Treat a UTF-8 locale as not being in locale at all */
2518 if (IN_UTF8_CTYPE_LOCALE) {
2519 flags &= ~FOLD_FLAGS_LOCALE;
2520 }
2521 else {
2522 _CHECK_AND_WARN_PROBLEMATIC_LOCALE;
e7b7ac46 2523 goto needs_full_generality;
780fcc9f 2524 }
31f05a37
KW
2525 }
2526
a1dde8de 2527 if (c < 256) {
e7b7ac46 2528 return _to_fold_latin1((U8) c, p, lenp,
31f05a37 2529 flags & (FOLD_FLAGS_FULL | FOLD_FLAGS_NOMIX_ASCII));
a1dde8de
KW
2530 }
2531
2f306ab9 2532 /* Here, above 255. If no special needs, just use the macro */
a0270393
KW
2533 if ( ! (flags & (FOLD_FLAGS_LOCALE|FOLD_FLAGS_NOMIX_ASCII))) {
2534 uvchr_to_utf8(p, c);
b9992569 2535 return CALL_FOLD_CASE(c, p, p, lenp, flags & FOLD_FLAGS_FULL);
a0270393 2536 }
567b353c 2537 else { /* Otherwise, _toFOLD_utf8_flags has the intelligence to deal with
a0270393
KW
2538 the special flags. */
2539 U8 utf8_c[UTF8_MAXBYTES + 1];
e7b7ac46
KW
2540
2541 needs_full_generality:
a0270393 2542 uvchr_to_utf8(utf8_c, c);
a1a5ec35 2543 return _toFOLD_utf8_flags(utf8_c, utf8_c + sizeof(utf8_c), p, lenp, flags);
a0270393 2544 }
84afefe6
JH
2545}
2546
26483009 2547PERL_STATIC_INLINE bool
5141f98e 2548S_is_utf8_common(pTHX_ const U8 *const p, SV **swash,
f25ce844 2549 const char *const swashname, SV* const invlist)
bde6a22d 2550{
ea317ccb
KW
2551 /* returns a boolean giving whether or not the UTF8-encoded character that
2552 * starts at <p> is in the swash indicated by <swashname>. <swash>
2553 * contains a pointer to where the swash indicated by <swashname>
2554 * is to be stored; which this routine will do, so that future calls will
f25ce844
KW
2555 * look at <*swash> and only generate a swash if it is not null. <invlist>
2556 * is NULL or an inversion list that defines the swash. If not null, it
2557 * saves time during initialization of the swash.
ea317ccb
KW
2558 *
2559 * Note that it is assumed that the buffer length of <p> is enough to
2560 * contain all the bytes that comprise the character. Thus, <*p> should
2561 * have been checked before this call for mal-formedness enough to assure
2562 * that. */
2563
7918f24d
NC
2564 PERL_ARGS_ASSERT_IS_UTF8_COMMON;
2565
492a624f 2566 /* The API should have included a length for the UTF-8 character in <p>,
28123549 2567 * but it doesn't. We therefore assume that p has been validated at least
492a624f
KW
2568 * as far as there being enough bytes available in it to accommodate the
2569 * character without reading beyond the end, and pass that number on to the
2570 * validating routine */
6302f837 2571 if (! isUTF8_CHAR(p, p + UTF8SKIP(p))) {
86ae6e94 2572 _force_out_malformed_utf8_message(p, p + UTF8SKIP(p),
99a765e9 2573 _UTF8_NO_CONFIDENCE_IN_CURLEN,
86ae6e94
KW
2574 1 /* Die */ );
2575 NOT_REACHED; /* NOTREACHED */
28123549 2576 }
86ae6e94 2577
87367d5f
KW
2578 if (!*swash) {
2579 U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
f25ce844
KW
2580 *swash = _core_swash_init("utf8",
2581
2582 /* Only use the name if there is no inversion
2583 * list; otherwise will go out to disk */
2584 (invlist) ? "" : swashname,
2585
2586 &PL_sv_undef, 1, 0, invlist, &flags);
87367d5f 2587 }
28123549 2588
bde6a22d
NC
2589 return swash_fetch(*swash, p, TRUE) != 0;
2590}
2591
da8c1a98
KW
2592PERL_STATIC_INLINE bool
2593S_is_utf8_common_with_len(pTHX_ const U8 *const p, const U8 * const e, SV **swash,
2594 const char *const swashname, SV* const invlist)
2595{
2596 /* returns a boolean giving whether or not the UTF8-encoded character that
2597 * starts at <p>, and extending no further than <e - 1> is in the swash
2598 * indicated by <swashname>. <swash> contains a pointer to where the swash
2599 * indicated by <swashname> is to be stored; which this routine will do, so
2600 * that future calls will look at <*swash> and only generate a swash if it
2601 * is not null. <invlist> is NULL or an inversion list that defines the
2602 * swash. If not null, it saves time during initialization of the swash.
2603 */
2604
2605 PERL_ARGS_ASSERT_IS_UTF8_COMMON_WITH_LEN;
2606
2607 if (! isUTF8_CHAR(p, e)) {
2608 _force_out_malformed_utf8_message(p, e, 0, 1);
2609 NOT_REACHED; /* NOTREACHED */
2610 }
2611
2612 if (!*swash) {
2613 U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
2614 *swash = _core_swash_init("utf8",
2615
2616 /* Only use the name if there is no inversion
2617 * list; otherwise will go out to disk */
2618 (invlist) ? "" : swashname,
2619
2620 &PL_sv_undef, 1, 0, invlist, &flags);
2621 }
2622
2623 return swash_fetch(*swash, p, TRUE) != 0;
2624}
2625
34aeb2e9
KW
2626STATIC void
2627S_warn_on_first_deprecated_use(pTHX_ const char * const name,
2628 const char * const alternative,
2629 const bool use_locale,
2630 const char * const file,
2631 const unsigned line)
2632{
2633 const char * key;
2634
2635 PERL_ARGS_ASSERT_WARN_ON_FIRST_DEPRECATED_USE;
2636
2637 if (ckWARN_d(WARN_DEPRECATED)) {
2638
2639 key = Perl_form(aTHX_ "%s;%d;%s;%d", name, use_locale, file, line);
2640 if (! hv_fetch(PL_seen_deprecated_macro, key, strlen(key), 0)) {
2641 if (! PL_seen_deprecated_macro) {
2642 PL_seen_deprecated_macro = newHV();
2643 }
2644 if (! hv_store(PL_seen_deprecated_macro, key,
2645 strlen(key), &PL_sv_undef, 0))
2646 {
2647 Perl_croak(aTHX_ "panic: hv_store() unexpectedly failed");
2648 }
2649
c44e9413 2650 if (instr(file, "mathoms.c")) {
607313a1
KW
2651 Perl_warner(aTHX_ WARN_DEPRECATED,
2652 "In %s, line %d, starting in Perl v5.30, %s()"
2653 " will be removed. Avoid this message by"
2654 " converting to use %s().\n",
2655 file, line, name, alternative);
2656 }
2657 else {
34aeb2e9
KW
2658 Perl_warner(aTHX_ WARN_DEPRECATED,
2659 "In %s, line %d, starting in Perl v5.30, %s() will"
2660 " require an additional parameter. Avoid this"
2661 " message by converting to use %s().\n",
2662 file, line, name, alternative);
607313a1 2663 }
34aeb2e9
KW
2664 }
2665 }
2666}
2667
bde6a22d 2668bool
34aeb2e9 2669Perl__is_utf8_FOO(pTHX_ U8 classnum,
be99e2c2 2670 const U8 * const p,
34aeb2e9
KW
2671 const char * const name,
2672 const char * const alternative,
2673 const bool use_utf8,
2674 const bool use_locale,
2675 const char * const file,
2676 const unsigned line)
922e8cb4 2677{
922e8cb4
KW
2678 PERL_ARGS_ASSERT__IS_UTF8_FOO;
2679
34aeb2e9
KW
2680 warn_on_first_deprecated_use(name, alternative, use_locale, file, line);
2681
2682 if (use_utf8 && UTF8_IS_ABOVE_LATIN1(*p)) {
34aeb2e9
KW
2683
2684 switch (classnum) {
2685 case _CC_WORDCHAR:
2686 case _CC_DIGIT:
2687 case _CC_ALPHA:
2688 case _CC_LOWER:
2689 case _CC_UPPER:
2690 case _CC_PUNCT:
2691 case _CC_PRINT:
2692 case _CC_ALPHANUMERIC:
2693 case _CC_GRAPH:
2694 case _CC_CASED:
2695
2696 return is_utf8_common(p,
2697 &PL_utf8_swash_ptrs[classnum],
2698 swash_property_names[classnum],
2699 PL_XPosix_ptrs[classnum]);
2700
2701 case _CC_SPACE:
2702 return is_XPERLSPACE_high(p);
2703 case _CC_BLANK:
2704 return is_HORIZWS_high(p);
2705 case _CC_XDIGIT:
2706 return is_XDIGIT_high(p);
2707 case _CC_CNTRL:
2708 return 0;
2709 case _CC_ASCII:
2710 return 0;
2711 case _CC_VERTSPACE:
2712 return is_VERTWS_high(p);
2713 case _CC_IDFIRST:
2714 if (! PL_utf8_perl_idstart) {
22f0498f
KW
2715 PL_utf8_perl_idstart
2716 = _new_invlist_C_array(_Perl_IDStart_invlist);
34aeb2e9 2717 }
22f0498f
KW
2718 return is_utf8_common(p, &PL_utf8_perl_idstart,
2719 "_Perl_IDStart", NULL);
34aeb2e9
KW
2720 case _CC_IDCONT:
2721 if (! PL_utf8_perl_idcont) {
22f0498f
KW
2722 PL_utf8_perl_idcont
2723 = _new_invlist_C_array(_Perl_IDCont_invlist);
34aeb2e9 2724 }
22f0498f
KW
2725 return is_utf8_common(p, &PL_utf8_perl_idcont,
2726 "_Perl_IDCont", NULL);
34aeb2e9
KW
2727 }
2728 }
2729
2730 /* idcont is the same as wordchar below 256 */
2731 if (classnum == _CC_IDCONT) {
2732 classnum = _CC_WORDCHAR;
2733 }
2734 else if (classnum == _CC_IDFIRST) {
2735 if (*p == '_') {
2736 return TRUE;
2737 }
2738 classnum = _CC_ALPHA;
2739 }
2740
2741 if (! use_locale) {
2742 if (! use_utf8 || UTF8_IS_INVARIANT(*p)) {
2743 return _generic_isCC(*p, classnum);
2744 }
922e8cb4 2745
34aeb2e9
KW
2746 return _generic_isCC(EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p + 1 )), classnum);
2747 }
2748 else {
2749 if (! use_utf8 || UTF8_IS_INVARIANT(*p)) {
2750 return isFOO_lc(classnum, *p);
2751 }
2752
2753 return isFOO_lc(classnum, EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p + 1 )));
2754 }
2755
2756 NOT_REACHED; /* NOTREACHED */
922e8cb4
KW
2757}
2758
2759bool
da8c1a98
KW
2760Perl__is_utf8_FOO_with_len(pTHX_ const U8 classnum, const U8 *p,
2761 const U8 * const e)
2762{
2763 PERL_ARGS_ASSERT__IS_UTF8_FOO_WITH_LEN;
2764
2765 assert(classnum < _FIRST_NON_SWASH_CC);
2766
2767 return is_utf8_common_with_len(p,
2768 e,
2769 &PL_utf8_swash_ptrs[classnum],
2770 swash_property_names[classnum],
2771 PL_XPosix_ptrs[classnum]);
2772}
2773
2774bool
da8c1a98
KW
2775Perl__is_utf8_perl_idstart_with_len(pTHX_ const U8 *p, const U8 * const e)
2776{
2777 SV* invlist = NULL;
2778
2779 PERL_ARGS_ASSERT__IS_UTF8_PERL_IDSTART_WITH_LEN;
2780
2781 if (! PL_utf8_perl_idstart) {
2782 invlist = _new_invlist_C_array(_Perl_IDStart_invlist);
2783 }
2784 return is_utf8_common_with_len(p, e, &PL_utf8_perl_idstart,
2785 "_Perl_IDStart", invlist);
2786}
2787
2788bool
f2645549 2789Perl__is_utf8_xidstart(pTHX_ const U8 *p)
c11ff943 2790{
f2645549 2791 PERL_ARGS_ASSERT__IS_UTF8_XIDSTART;
c11ff943
KW
2792
2793 if (*p == '_')
2794 return TRUE;
f25ce844 2795 return is_utf8_common(p, &PL_utf8_xidstart, "XIdStart", NULL);
c11ff943
KW
2796}
2797
2798bool
da8c1a98
KW
2799Perl__is_utf8_perl_idcont_with_len(pTHX_ const U8 *p, const U8 * const e)
2800{
2801 SV* invlist = NULL;
2802
2803 PERL_ARGS_ASSERT__IS_UTF8_PERL_IDCONT_WITH_LEN;
2804
2805 if (! PL_utf8_perl_idcont) {
2806 invlist = _new_invlist_C_array(_Perl_IDCont_invlist);
2807 }
2808 return is_utf8_common_with_len(p, e, &PL_utf8_perl_idcont,
2809 "_Perl_IDCont", invlist);
2810}
2811
2812bool
f2645549 2813Perl__is_utf8_idcont(pTHX_ const U8 *p)
82686b01 2814{
f2645549 2815 PERL_ARGS_ASSERT__IS_UTF8_IDCONT;
7918f24d 2816
f25ce844 2817 return is_utf8_common(p, &PL_utf8_idcont, "IdContinue", NULL);
a0ed51b3
LW
2818}
2819
2820bool
f2645549 2821Perl__is_utf8_xidcont(pTHX_ const U8 *p)
c11ff943 2822{
f2645549 2823 PERL_ARGS_ASSERT__IS_UTF8_XIDCONT;
c11ff943 2824
f25ce844 2825 return is_utf8_common(p, &PL_utf8_idcont, "XIdContinue", NULL);
c11ff943
KW
2826}
2827
2828bool
7dbf68d2
KW
2829Perl__is_utf8_mark(pTHX_ const U8 *p)
2830{
7dbf68d2
KW
2831 PERL_ARGS_ASSERT__IS_UTF8_MARK;
2832
f25ce844 2833 return is_utf8_common(p, &PL_utf8_mark, "IsM", NULL);
7dbf68d2
KW
2834}
2835
b9992569 2836 /* change namve uv1 to 'from' */
6a4a25f4 2837STATIC UV
b9992569
KW
2838S__to_utf8_case(pTHX_ const UV uv1, const U8 *p, U8* ustrp, STRLEN *lenp,
2839 SV **swashp, const char *normal, const char *special)
2840{
0134edef 2841 STRLEN len = 0;
7918f24d 2842
b9992569 2843 PERL_ARGS_ASSERT__TO_UTF8_CASE;
7918f24d 2844
36eaa811
KW
2845 /* For code points that don't change case, we already know that the output
2846 * of this function is the unchanged input, so we can skip doing look-ups
2847 * for them. Unfortunately the case-changing code points are scattered
2848 * around. But there are some long consecutive ranges where there are no
2849 * case changing code points. By adding tests, we can eliminate the lookup
2850 * for all the ones in such ranges. This is currently done here only for
2851 * just a few cases where the scripts are in common use in modern commerce
2852 * (and scripts adjacent to those which can be included without additional
2853 * tests). */
2854
2855 if (uv1 >= 0x0590) {
2856 /* This keeps from needing further processing the code points most
2857 * likely to be used in the following non-cased scripts: Hebrew,
2858 * Arabic, Syriac, Thaana, NKo, Samaritan, Mandaic, Devanagari,
2859 * Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada,
2860 * Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar */
2861 if (uv1 < 0x10A0) {
2862 goto cases_to_self;
2863 }
2864
2865 /* The following largish code point ranges also don't have case
2866 * changes, but khw didn't think they warranted extra tests to speed
2867 * them up (which would slightly slow down everything else above them):
2868 * 1100..139F Hangul Jamo, Ethiopic
2869 * 1400..1CFF Unified Canadian Aboriginal Syllabics, Ogham, Runic,
2870 * Tagalog, Hanunoo, Buhid, Tagbanwa, Khmer, Mongolian,
2871 * Limbu, Tai Le, New Tai Lue, Buginese, Tai Tham,
2872 * Combining Diacritical Marks Extended, Balinese,
2873 * Sundanese, Batak, Lepcha, Ol Chiki
2874 * 2000..206F General Punctuation
2875 */
2876
2877 if (uv1 >= 0x2D30) {
2878
2879 /* This keeps the from needing further processing the code points
2880 * most likely to be used in the following non-cased major scripts:
2881 * CJK, Katakana, Hiragana, plus some less-likely scripts.
2882 *
2883 * (0x2D30 above might have to be changed to 2F00 in the unlikely
2884 * event that Unicode eventually allocates the unused block as of
2885 * v8.0 2FE0..2FEF to code points that are cased. khw has verified
2886 * that the test suite will start having failures to alert you
2887 * should that happen) */
2888 if (uv1 < 0xA640) {
2889 goto cases_to_self;
2890 }
2891
2892 if (uv1 >= 0xAC00) {
2893 if (UNLIKELY(UNICODE_IS_SURROGATE(uv1))) {
5af9bc97
KW
2894 if (ckWARN_d(WARN_SURROGATE)) {
2895 const char* desc = (PL_op) ? OP_DESC(PL_op) : normal;
2896 Perl_warner(aTHX_ packWARN(WARN_SURROGATE),
147e3846 2897 "Operation \"%s\" returns its argument for UTF-16 surrogate U+%04" UVXf, desc, uv1);
5af9bc97
KW
2898 }
2899 goto cases_to_self;
2900 }
36eaa811
KW
2901
2902 /* AC00..FAFF Catches Hangul syllables and private use, plus
2903 * some others */
2904 if (uv1 < 0xFB00) {
2905 goto cases_to_self;
2906
2907 }
2908
5af9bc97 2909 if (UNLIKELY(UNICODE_IS_SUPER(uv1))) {
13f4dd34
A
2910 if (UNLIKELY(uv1 > MAX_NON_DEPRECATED_CP)) {
2911 Perl_croak(aTHX_ cp_above_legal_max, uv1,
2912 MAX_NON_DEPRECATED_CP);
5af9bc97
KW
2913 }
2914 if (ckWARN_d(WARN_NON_UNICODE)) {
2915 const char* desc = (PL_op) ? OP_DESC(PL_op) : normal;
2916 Perl_warner(aTHX_ packWARN(WARN_NON_UNICODE),
147e3846 2917 "Operation \"%s\" returns its argument for non-Unicode code point 0x%04" UVXf, desc, uv1);
5af9bc97
KW
2918 }
2919 goto cases_to_self;
2920 }
3bfc1e70
KW
2921#ifdef HIGHEST_CASE_CHANGING_CP_FOR_USE_ONLY_BY_UTF8_DOT_C
2922 if (UNLIKELY(uv1
2923 > HIGHEST_CASE_CHANGING_CP_FOR_USE_ONLY_BY_UTF8_DOT_C))
2924 {
2925
2926 /* As of this writing, this means we avoid swash creation
2927 * for anything beyond low Plane 1 */
2928 goto cases_to_self;
2929 }
2930#endif
36eaa811
KW
2931 }
2932 }
9ae3ac1a 2933
36eaa811
KW
2934 /* Note that non-characters are perfectly legal, so no warning should
2935 * be given. There are so few of them, that it isn't worth the extra
2936 * tests to avoid swash creation */
9ae3ac1a
KW
2937 }
2938
0134edef 2939 if (!*swashp) /* load on-demand */
5ab9d2ef 2940 *swashp = _core_swash_init("utf8", normal, &PL_sv_undef, 4, 0, NULL, NULL);
0134edef 2941
a6f87d8c 2942 if (special) {
0134edef 2943 /* It might be "special" (sometimes, but not always,
2a37f04d 2944 * a multicharacter mapping) */
4a8240a3 2945 HV *hv = NULL;
b08cf34e
JH
2946 SV **svp;
2947
4a8240a3
KW
2948 /* If passed in the specials name, use that; otherwise use any
2949 * given in the swash */
2950 if (*special != '\0') {
2951 hv = get_hv(special, 0);
2952 }
2953 else {
2954 svp = hv_fetchs(MUTABLE_HV(SvRV(*swashp)), "SPECIALS", 0);
2955 if (svp) {
2956 hv = MUTABLE_HV(SvRV(*svp));
2957 }
2958 }
2959
176fe009 2960 if (hv
5f560d8a 2961 && (svp = hv_fetch(hv, (const char*)p, UVCHR_SKIP(uv1), FALSE))
176fe009
KW
2962 && (*svp))
2963 {
cfd0369c 2964 const char *s;
47654450 2965
cfd0369c 2966 s = SvPV_const(*svp, len);
47654450 2967 if (len == 1)
f4cd282c 2968 /* EIGHTBIT */
c80e42f3 2969 len = uvchr_to_utf8(ustrp, *(U8*)s) - ustrp;
2a37f04d 2970 else {
d2dcd0fb 2971 Copy(s, ustrp, len, U8);
29e98929 2972 }
983ffd37 2973 }
0134edef
JH
2974 }
2975
2976 if (!len && *swashp) {
4a4088c4 2977 const UV uv2 = swash_fetch(*swashp, p, TRUE /* => is UTF-8 */);
d4c19fe8 2978
0134edef
JH
2979 if (uv2) {
2980 /* It was "normal" (a single character mapping). */
f4cd282c 2981 len = uvchr_to_utf8(ustrp, uv2) - ustrp;
2a37f04d
JH
2982 }
2983 }
1feea2c7 2984
cbe07460
KW
2985 if (len) {
2986 if (lenp) {
2987 *lenp = len;
2988 }
2989 return valid_utf8_to_uvchr(ustrp, 0);
2990 }
2991
2992 /* Here, there was no mapping defined, which means that the code point maps
2993 * to itself. Return the inputs */
e24dfe9c 2994 cases_to_self:
bfdf22ec 2995 len = UTF8SKIP(p);
ca9fab46
KW
2996 if (p != ustrp) { /* Don't copy onto itself */
2997 Copy(p, ustrp, len, U8);
2998 }
0134edef 2999
2a37f04d
JH
3000 if (lenp)
3001 *lenp = len;
3002
f4cd282c 3003 return uv1;
cbe07460 3004
a0ed51b3
LW
3005}
3006
051a06d4 3007STATIC UV
357aadde 3008S_check_locale_boundary_crossing(pTHX_ const U8* const p, const UV result, U8* const ustrp, STRLEN *lenp)
051a06d4 3009{
4a4088c4 3010 /* This is called when changing the case of a UTF-8-encoded character above
31f05a37
KW
3011 * the Latin1 range, and the operation is in a non-UTF-8 locale. If the
3012 * result contains a character that crosses the 255/256 boundary, disallow
3013 * the change, and return the original code point. See L<perlfunc/lc> for
3014 * why;
051a06d4 3015 *
a1433954
KW
3016 * p points to the original string whose case was changed; assumed
3017 * by this routine to be well-formed
051a06d4
KW
3018 * result the code point of the first character in the changed-case string
3019 * ustrp points to the changed-case string (<result> represents its first char)
3020 * lenp points to the length of <ustrp> */
3021
3022 UV original; /* To store the first code point of <p> */
3023
3024 PERL_ARGS_ASSERT_CHECK_LOCALE_BOUNDARY_CROSSING;
3025
a4f12ed7 3026 assert(UTF8_IS_ABOVE_LATIN1(*p));
051a06d4
KW
3027
3028 /* We know immediately if the first character in the string crosses the
3029 * boundary, so can skip */
3030 if (result > 255) {
3031
3032 /* Look at every character in the result; if any cross the
3033 * boundary, the whole thing is disallowed */
3034 U8* s = ustrp + UTF8SKIP(ustrp);
3035 U8* e = ustrp + *lenp;
3036 while (s < e) {
a4f12ed7 3037 if (! UTF8_IS_ABOVE_LATIN1(*s)) {
051a06d4
KW
3038 goto bad_crossing;
3039 }
3040 s += UTF8SKIP(s);
3041 }
3042
613abc6d
KW
3043 /* Here, no characters crossed, result is ok as-is, but we warn. */
3044 _CHECK_AND_OUTPUT_WIDE_LOCALE_UTF8_MSG(p, p + UTF8SKIP(p));
051a06d4
KW
3045 return result;
3046 }
3047
7b52d656 3048 bad_crossing:
051a06d4
KW
3049
3050 /* Failed, have to return the original */
4b88fb76 3051 original = valid_utf8_to_uvchr(p, lenp);
ab0b796c
KW
3052
3053 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3054 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
147e3846
KW
3055 "Can't do %s(\"\\x{%" UVXf "}\") on non-UTF-8 locale; "
3056 "resolved to \"\\x{%" UVXf "}\".",
357aadde 3057 OP_DESC(PL_op),
ab0b796c
KW
3058 original,
3059 original);
051a06d4
KW
3060 Copy(p, ustrp, *lenp, char);
3061 return original;
3062}
3063
607313a1
KW
3064STATIC U32
3065S_check_and_deprecate(pTHX_ const U8 *p,
3066 const U8 **e,
3067 const unsigned int type, /* See below */
3068 const bool use_locale, /* Is this a 'LC_'
3069 macro call? */
3070 const char * const file,
3071 const unsigned line)
3072{
3073 /* This is a temporary function to deprecate the unsafe calls to the case
3074 * changing macros and functions. It keeps all the special stuff in just
3075 * one place.
3076 *
3077 * It updates *e with the pointer to the end of the input string. If using
3078 * the old-style macros, *e is NULL on input, and so this function assumes
3079 * the input string is long enough to hold the entire UTF-8 sequence, and
3080 * sets *e accordingly, but it then returns a flag to pass the
3081 * utf8n_to_uvchr(), to tell it that this size is a guess, and to avoid
3082 * using the full length if possible.
3083 *
3084 * It also does the assert that *e > p when *e is not NULL. This should be
3085 * migrated to the callers when this function gets deleted.
3086 *
3087 * The 'type' parameter is used for the caller to specify which case
3088 * changing function this is called from: */
3089
3090# define DEPRECATE_TO_UPPER 0
3091# define DEPRECATE_TO_TITLE 1
3092# define DEPRECATE_TO_LOWER 2
3093# define DEPRECATE_TO_FOLD 3
3094
3095 U32 utf8n_flags = 0;
3096 const char * name;
3097 const char * alternative;
3098
3099 PERL_ARGS_ASSERT_CHECK_AND_DEPRECATE;
3100
3101 if (*e == NULL) {
3102 utf8n_flags = _UTF8_NO_CONFIDENCE_IN_CURLEN;
3103 *e = p + UTF8SKIP(p);
3104
3105 /* For mathoms.c calls, we use the function name we know is stored
c44e9413 3106 * there. It could be part of a larger path */
607313a1 3107 if (type == DEPRECATE_TO_UPPER) {
c44e9413 3108 name = instr(file, "mathoms.c")
607313a1
KW
3109 ? "to_utf8_upper"
3110 : "toUPPER_utf8";
3111 alternative = "toUPPER_utf8_safe";
3112 }
3113 else if (type == DEPRECATE_TO_TITLE) {
c44e9413 3114 name = instr(file, "mathoms.c")
607313a1
KW
3115 ? "to_utf8_title"
3116 : "toTITLE_utf8";
3117 alternative = "toTITLE_utf8_safe";
3118 }
3119 else if (type == DEPRECATE_TO_LOWER) {
c44e9413 3120 name = instr(file, "mathoms.c")
607313a1
KW
3121 ? "to_utf8_lower"
3122 : "toLOWER_utf8";
3123 alternative = "toLOWER_utf8_safe";
3124 }
3125 else if (type == DEPRECATE_TO_FOLD) {
c44e9413 3126 name = instr(file, "mathoms.c")
607313a1
KW
3127 ? "to_utf8_fold"
3128 : "toFOLD_utf8";
3129 alternative = "toFOLD_utf8_safe";
3130 }
3131 else Perl_croak(aTHX_ "panic: Unexpected case change type");
3132
3133 warn_on_first_deprecated_use(name, alternative, use_locale, file, line);
3134 }
3135 else {
3136 assert (p < *e);
3137 }
3138
3139 return utf8n_flags;
3140}
3141
eaf412bf
KW
3142/* The process for changing the case is essentially the same for the four case
3143 * change types, except there are complications for folding. Otherwise the
3144 * difference is only which case to change to. To make sure that they all do
3145 * the same thing, the bodies of the functions are extracted out into the
3146 * following two macros. The functions are written with the same variable
3147 * names, and these are known and used inside these macros. It would be
3148 * better, of course, to have inline functions to do it, but since different
3149 * macros are called, depending on which case is being changed to, this is not
3150 * feasible in C (to khw's knowledge). Two macros are created so that the fold
3151 * function can start with the common start macro, then finish with its special
3152 * handling; while the other three cases can just use the common end macro.
3153 *
3154 * The algorithm is to use the proper (passed in) macro or function to change
3155 * the case for code points that are below 256. The macro is used if using
3156 * locale rules for the case change; the function if not. If the code point is
3157 * above 255, it is computed from the input UTF-8, and another macro is called
3158 * to do the conversion. If necessary, the output is converted to UTF-8. If
3159 * using a locale, we have to check that the change did not cross the 255/256
3160 * boundary, see check_locale_boundary_crossing() for further details.
3161 *
3162 * The macros are split with the correct case change for the below-256 case
3163 * stored into 'result', and in the middle of an else clause for the above-255
3164 * case. At that point in the 'else', 'result' is not the final result, but is
3165 * the input code point calculated from the UTF-8. The fold code needs to
3166 * realize all this and take it from there.
3167 *
3168 * If you read the two macros as sequential, it's easier to understand what's
3169 * going on. */
3170#define CASE_CHANGE_BODY_START(locale_flags, LC_L1_change_macro, L1_func, \
3171 L1_func_extra_param) \
a239b1e2 3172 \
eaf412bf
KW
3173 if (flags & (locale_flags)) { \
3174 /* Treat a UTF-8 locale as not being in locale at all */ \
3175 if (IN_UTF8_CTYPE_LOCALE) { \
3176 flags &= ~(locale_flags); \
3177 } \
3178 else { \
3179 _CHECK_AND_WARN_PROBLEMATIC_LOCALE; \
3180 } \
3181 } \
3182 \
3183 if (UTF8_IS_INVARIANT(*p)) { \
3184 if (flags & (locale_flags)) { \
3185 result = LC_L1_change_macro(*p); \
3186 } \
3187 else { \
3188 return L1_func(*p, ustrp, lenp, L1_func_extra_param); \
3189 } \
3190 } \
a239b1e2 3191 else if UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(p, e) { \
eaf412bf
KW
3192 if (flags & (locale_flags)) { \
3193 result = LC_L1_change_macro(EIGHT_BIT_UTF8_TO_NATIVE(*p, \
3194 *(p+1))); \
3195 } \
3196 else { \
3197 return L1_func(EIGHT_BIT_UTF8_TO_NATIVE(*p, *(p+1)), \
3198 ustrp, lenp, L1_func_extra_param); \
3199 } \
3200 } \
fa8ab374
KW
3201 else { /* malformed UTF-8 or ord above 255 */ \
3202 STRLEN len_result; \
fa8ab374
KW
3203 result = utf8n_to_uvchr(p, e - p, &len_result, UTF8_CHECK_ONLY); \
3204 if (len_result == (STRLEN) -1) { \
607313a1
KW
3205 _force_out_malformed_utf8_message(p, e, utf8n_flags, \
3206 1 /* Die */ ); \
fa8ab374 3207 }
eaf412bf
KW
3208
3209#define CASE_CHANGE_BODY_END(locale_flags, change_macro) \
3210 result = change_macro(result, p, ustrp, lenp); \
3211 \
3212 if (flags & (locale_flags)) { \
3213 result = check_locale_boundary_crossing(p, result, ustrp, lenp); \
3214 } \
3215 return result; \
3216 } \
3217 \
3218 /* Here, used locale rules. Convert back to UTF-8 */ \
3219 if (UTF8_IS_INVARIANT(result)) { \
3220 *ustrp = (U8) result; \
3221 *lenp = 1; \
3222 } \
3223 else { \
3224 *ustrp = UTF8_EIGHT_BIT_HI((U8) result); \
3225 *(ustrp + 1) = UTF8_EIGHT_BIT_LO((U8) result); \
3226 *lenp = 2; \
3227 } \
3228 \
3229 return result;
3230
d3e79532 3231/*
87cea99e 3232=for apidoc to_utf8_upper
d3e79532 3233
a239b1e2 3234Instead use L</toUPPER_utf8_safe>.
a1433954 3235
d3e79532
JH
3236=cut */
3237
051a06d4 3238/* Not currently externally documented, and subject to change:
31f05a37
KW
3239 * <flags> is set iff iff the rules from the current underlying locale are to
3240 * be used. */
051a06d4 3241
2104c8d9 3242UV
607313a1
KW
3243Perl__to_utf8_upper_flags(pTHX_ const U8 *p,
3244 const U8 *e,
3245 U8* ustrp,
3246 STRLEN *lenp,
3247 bool flags,
3248 const char * const file,
3249 const int line)
a0ed51b3 3250{
051a06d4 3251 UV result;
607313a1
KW
3252 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_UPPER,
3253 cBOOL(flags), file, line);
051a06d4
KW
3254
3255 PERL_ARGS_ASSERT__TO_UTF8_UPPER_FLAGS;
7918f24d 3256
eaf412bf
KW
3257 /* ~0 makes anything non-zero in 'flags' mean we are using locale rules */
3258 /* 2nd char of uc(U+DF) is 'S' */
3259 CASE_CHANGE_BODY_START(~0, toUPPER_LC, _to_upper_title_latin1, 'S');
3260 CASE_CHANGE_BODY_END (~0, CALL_UPPER_CASE);
983ffd37 3261}
a0ed51b3 3262
d3e79532 3263/*
87cea99e 3264=for apidoc to_utf8_title
d3e79532 3265
a239b1e2 3266Instead use L</toTITLE_utf8_safe>.
a1433954 3267
d3e79532
JH
3268=cut */
3269
051a06d4 3270/* Not currently externally documented, and subject to change:
31f05a37
KW
3271 * <flags> is set iff the rules from the current underlying locale are to be
3272 * used. Since titlecase is not defined in POSIX, for other than a
3273 * UTF-8 locale, uppercase is used instead for code points < 256.
445bf929 3274 */
051a06d4 3275
983ffd37 3276UV
607313a1
KW
3277Perl__to_utf8_title_flags(pTHX_ const U8 *p,
3278 const U8 *e,
3279 U8* ustrp,
3280 STRLEN *lenp,
3281 bool flags,
3282 const char * const file,
3283 const int line)
983ffd37 3284{
051a06d4 3285 UV result;
607313a1
KW
3286 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_TITLE,
3287 cBOOL(flags), file, line);
051a06d4
KW
3288
3289 PERL_ARGS_ASSERT__TO_UTF8_TITLE_FLAGS;
7918f24d 3290
eaf412bf
KW
3291 /* 2nd char of ucfirst(U+DF) is 's' */
3292 CASE_CHANGE_BODY_START(~0, toUPPER_LC, _to_upper_title_latin1, 's');
3293 CASE_CHANGE_BODY_END (~0, CALL_TITLE_CASE);
a0ed51b3
LW
3294}
3295
d3e79532 3296/*
87cea99e 3297=for apidoc to_utf8_lower
d3e79532 3298
a239b1e2 3299Instead use L</toLOWER_utf8_safe>.
a1433954 3300
d3e79532
JH
3301=cut */
3302
051a06d4 3303/* Not currently externally documented, and subject to change:
31f05a37
KW
3304 * <flags> is set iff iff the rules from the current underlying locale are to
3305 * be used.
3306 */
051a06d4 3307
2104c8d9 3308UV
607313a1
KW
3309Perl__to_utf8_lower_flags(pTHX_ const U8 *p,
3310 const U8 *e,
3311 U8* ustrp,
3312 STRLEN *lenp,
3313 bool flags,
3314 const char * const file,
3315 const int line)
a0ed51b3 3316{
051a06d4 3317 UV result;
607313a1
KW
3318 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_LOWER,
3319 cBOOL(flags), file, line);
051a06d4 3320
051a06d4 3321 PERL_ARGS_ASSERT__TO_UTF8_LOWER_FLAGS;
7918f24d 3322
eaf412bf
KW
3323 CASE_CHANGE_BODY_START(~0, toLOWER_LC, to_lower_latin1, 0 /* 0 is dummy */)
3324 CASE_CHANGE_BODY_END (~0, CALL_LOWER_CASE)
b4e400f9
JH
3325}
3326
d3e79532 3327/*
87cea99e 3328=for apidoc to_utf8_fold
d3e79532 3329
a239b1e2 3330Instead use L</toFOLD_utf8_safe>.
a1433954 3331
d3e79532
JH
3332=cut */
3333
051a06d4
KW
3334/* Not currently externally documented, and subject to change,
3335 * in <flags>
31f05a37
KW
3336 * bit FOLD_FLAGS_LOCALE is set iff the rules from the current underlying
3337 * locale are to be used.
051a06d4
KW
3338 * bit FOLD_FLAGS_FULL is set iff full case folds are to be used;
3339 * otherwise simple folds
a0270393
KW
3340 * bit FOLD_FLAGS_NOMIX_ASCII is set iff folds of non-ASCII to ASCII are
3341 * prohibited
445bf929 3342 */
36bb2ab6 3343
b4e400f9 3344UV
607313a1
KW
3345Perl__to_utf8_fold_flags(pTHX_ const U8 *p,
3346 const U8 *e,
3347 U8* ustrp,
3348 STRLEN *lenp,
3349 U8 flags,
3350 const char * const file,
3351 const int line)
b4e400f9 3352{
051a06d4 3353 UV result;
607313a1
KW
3354 const U32 utf8n_flags = check_and_deprecate(p, &e, DEPRECATE_TO_FOLD,
3355 cBOOL(flags), file, line);
051a06d4 3356
36bb2ab6 3357 PERL_ARGS_ASSERT__TO_UTF8_FOLD_FLAGS;
7918f24d 3358
a0270393
KW
3359 /* These are mutually exclusive */
3360 assert (! ((flags & FOLD_FLAGS_LOCALE) && (flags & FOLD_FLAGS_NOMIX_ASCII)));
3361
50ba90ff
KW
3362 assert(p != ustrp); /* Otherwise overwrites */
3363
eaf412bf
KW
3364 CASE_CHANGE_BODY_START(FOLD_FLAGS_LOCALE, toFOLD_LC, _to_fold_latin1,
3365 ((flags) & (FOLD_FLAGS_FULL | FOLD_FLAGS_NOMIX_ASCII)));
31f05a37 3366
eaf412bf 3367 result = CALL_FOLD_CASE(result, p, ustrp, lenp, flags & FOLD_FLAGS_FULL);
a1dde8de 3368
1ca267a5
KW
3369 if (flags & FOLD_FLAGS_LOCALE) {
3370
76f2ffcd 3371# define LONG_S_T LATIN_SMALL_LIGATURE_LONG_S_T_UTF8
0766489e
KW
3372 const unsigned int long_s_t_len = sizeof(LONG_S_T) - 1;
3373
3374# ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
3375# define CAP_SHARP_S LATIN_CAPITAL_LETTER_SHARP_S_UTF8
76f2ffcd
KW
3376
3377 const unsigned int cap_sharp_s_len = sizeof(CAP_SHARP_S) - 1;
76f2ffcd 3378
538e84ed
KW
3379 /* Special case these two characters, as what normally gets
3380 * returned under locale doesn't work */
76f2ffcd
KW
3381 if (UTF8SKIP(p) == cap_sharp_s_len
3382 && memEQ((char *) p, CAP_SHARP_S, cap_sharp_s_len))
1ca267a5 3383 {
ab0b796c
KW
3384 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3385 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3386 "Can't do fc(\"\\x{1E9E}\") on non-UTF-8 locale; "
3387 "resolved to \"\\x{17F}\\x{17F}\".");
1ca267a5
KW
3388 goto return_long_s;
3389 }
0766489e
KW
3390 else
3391#endif
3392 if (UTF8SKIP(p) == long_s_t_len
76f2ffcd 3393 && memEQ((char *) p, LONG_S_T, long_s_t_len))
9fc2026f 3394 {
ab0b796c
KW
3395 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3396 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3397 "Can't do fc(\"\\x{FB05}\") on non-UTF-8 locale; "
3398 "resolved to \"\\x{FB06}\".");
9fc2026f
KW
3399 goto return_ligature_st;
3400 }
74894415
KW
3401
3402#if UNICODE_MAJOR_VERSION == 3 \
3403 && UNICODE_DOT_VERSION == 0 \
3404 && UNICODE_DOT_DOT_VERSION == 1
3405# define DOTTED_I LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE_UTF8
3406
3407 /* And special case this on this Unicode version only, for the same
3408 * reaons the other two are special cased. They would cross the
3409 * 255/256 boundary which is forbidden under /l, and so the code
3410 * wouldn't catch that they are equivalent (which they are only in
3411 * this release) */
3412 else if (UTF8SKIP(p) == sizeof(DOTTED_I) - 1
3413 && memEQ((char *) p, DOTTED_I, sizeof(DOTTED_I) - 1))
3414 {
3415 /* diag_listed_as: Can't do %s("%s") on non-UTF-8 locale; resolved to "%s". */
3416 Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
3417 "Can't do fc(\"\\x{0130}\") on non-UTF-8 locale; "
3418 "resolved to \"\\x{0131}\".");
3419 goto return_dotless_i;
3420 }
3421#endif
3422
357aadde 3423 return check_locale_boundary_crossing(p, result, ustrp, lenp);
051a06d4 3424 }
a0270393
KW
3425 else if (! (flags & FOLD_FLAGS_NOMIX_ASCII)) {
3426 return result;
3427 }
3428 else {
4a4088c4 3429 /* This is called when changing the case of a UTF-8-encoded
9fc2026f
KW
3430 * character above the ASCII range, and the result should not
3431 * contain an ASCII character. */
a0270393
KW
3432
3433 UV original; /* To store the first code point of <p> */
3434
3435 /* Look at every character in the result; if any cross the
3436 * boundary, the whole thing is disallowed */
3437 U8* s = ustrp;
3438 U8* e = ustrp + *lenp;
3439 while (s < e) {
3440 if (isASCII(*s)) {
3441 /* Crossed, have to return the original */
3442 original = valid_utf8_to_uvchr(p, lenp);
1ca267a5 3443
9fc2026f 3444 /* But in these instances, there is an alternative we can
1ca267a5 3445 * return that is valid */
0766489e
KW
3446 if (original == LATIN_SMALL_LETTER_SHARP_S
3447#ifdef LATIN_CAPITAL_LETTER_SHARP_S /* not defined in early Unicode releases */
3448 || original == LATIN_CAPITAL_LETTER_SHARP_S
3449#endif
3450 ) {
1ca267a5
KW
3451 goto return_long_s;
3452 }
9fc2026f
KW
3453 else if (original == LATIN_SMALL_LIGATURE_LONG_S_T) {
3454 goto return_ligature_st;
3455 }
74894415
KW
3456#if UNICODE_MAJOR_VERSION == 3 \
3457 && UNICODE_DOT_VERSION == 0 \
3458 && UNICODE_DOT_DOT_VERSION == 1
3459
3460 else if (original == LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE) {
3461 goto return_dotless_i;
3462 }
3463#endif
a0270393
KW
3464 Copy(p, ustrp, *lenp, char);
3465 return original;
3466 }
3467 s += UTF8SKIP(s);
3468 }
051a06d4 3469
a0270393
KW
3470 /* Here, no characters crossed, result is ok as-is */
3471 return result;
3472 }
051a06d4
KW
3473 }
3474
4a4088c4 3475 /* Here, used locale rules. Convert back to UTF-8 */
051a06d4
KW
3476 if (UTF8_IS_INVARIANT(result)) {
3477 *ustrp = (U8) result;
3478 *lenp = 1;
3479 }
3480 else {
62cb07ea
KW
3481 *ustrp = UTF8_EIGHT_BIT_HI((U8) result);
3482 *(ustrp + 1) = UTF8_EIGHT_BIT_LO((U8) result);
051a06d4
KW
3483 *lenp = 2;
3484 }
3485
051a06d4 3486 return result;
1ca267a5
KW
3487
3488 return_long_s:
3489 /* Certain folds to 'ss' are prohibited by the options, but they do allow
3490 * folds to a string of two of these characters. By returning this
3491 * instead, then, e.g.,
3492 * fc("\x{1E9E}") eq fc("\x{17F}\x{17F}")
3493 * works. */
3494
3495 *lenp = 2 * sizeof(LATIN_SMALL_LETTER_LONG_S_UTF8) - 2;
3496 Copy(LATIN_SMALL_LETTER_LONG_S_UTF8 LATIN_SMALL_LETTER_LONG_S_UTF8,
3497 ustrp, *lenp, U8);
3498 return LATIN_SMALL_LETTER_LONG_S;
9fc2026f
KW
3499
3500 return_ligature_st:
3501 /* Two folds to 'st' are prohibited by the options; instead we pick one and
3502 * have the other one fold to it */
3503
3504 *lenp = sizeof(LATIN_SMALL_LIGATURE_ST_UTF8) - 1;
3505 Copy(LATIN_SMALL_LIGATURE_ST_UTF8, ustrp, *lenp, U8);
3506 return LATIN_SMALL_LIGATURE_ST;
74894415
KW
3507
3508#if UNICODE_MAJOR_VERSION == 3 \
3509 && UNICODE_DOT_VERSION == 0 \
3510 && UNICODE_DOT_DOT_VERSION == 1
3511
3512 return_dotless_i:
3513 *lenp = sizeof(LATIN_SMALL_LETTER_DOTLESS_I_UTF8) - 1;
3514 Copy(LATIN_SMALL_LETTER_DOTLESS_I_UTF8, ustrp, *lenp, U8);
3515 return LATIN_SMALL_LETTER_DOTLESS_I;
3516
3517#endif
3518
a0ed51b3
LW
3519}
3520
711a919c 3521/* Note:
f90a9a02 3522 * Returns a "swash" which is a hash described in utf8.c:Perl_swash_fetch().
711a919c
ST
3523 * C<pkg> is a pointer to a package name for SWASHNEW, should be "utf8".
3524 * For other parameters, see utf8::SWASHNEW in lib/utf8_heavy.pl.
3525 */
c4a5db0c 3526
a0ed51b3 3527SV*
7fc63493 3528Perl_swash_init(pTHX_ const char* pkg, const char* name, SV *listsv, I32 minbits, I32 none)
a0ed51b3 3529{
c4a5db0c
KW
3530 PERL_ARGS_ASSERT_SWASH_INIT;
3531
3532 /* Returns a copy of a swash initiated by the called function. This is the
3533 * public interface, and returning a copy prevents others from doing
3534 * mischief on the original */
3535
5d3d13d1 3536 return newSVsv(_core_swash_init(pkg, name, listsv, minbits, none, NULL, NULL));
c4a5db0c
KW
3537}
3538
3539SV*
5d3d13d1 3540Perl__core_swash_init(pTHX_ const char* pkg, const char* name, SV *listsv, I32 minbits, I32 none, SV* invlist, U8* const flags_p)
c4a5db0c 3541{
2c1f00b9
YO
3542
3543 /*NOTE NOTE NOTE - If you want to use "return" in this routine you MUST
3544 * use the following define */
3545
3546#define CORE_SWASH_INIT_RETURN(x) \
3547 PL_curpm= old_PL_curpm; \
3548 return x
3549
c4a5db0c 3550 /* Initialize and return a swash, creating it if necessary. It does this
87367d5f
KW
3551 * by calling utf8_heavy.pl in the general case. The returned value may be
3552 * the swash's inversion list instead if the input parameters allow it.
3553 * Which is returned should be immaterial to callers, as the only
923b6d4e
KW
3554 * operations permitted on a swash, swash_fetch(), _get_swash_invlist(),
3555 * and swash_to_invlist() handle both these transparently.
c4a5db0c
KW
3556 *
3557 * This interface should only be used by functions that won't destroy or
3558 * adversely change the swash, as doing so affects all other uses of the
3559 * swash in the program; the general public should use 'Perl_swash_init'
3560 * instead.
3561 *
3562 * pkg is the name of the package that <name> should be in.
3563 * name is the name of the swash to find. Typically it is a Unicode
3564 * property name, including user-defined ones
3565 * listsv is a string to initialize the swash with. It must be of the form
3566 * documented as the subroutine return value in
3567 * L<perlunicode/User-Defined Character Properties>
3568 * minbits is the number of bits required to represent each data element.
3569 * It is '1' for binary properties.
3570 * none I (khw) do not understand this one, but it is used only in tr///.
9a53f6cf 3571 * invlist is an inversion list to initialize the swash with (or NULL)
83199d38
KW
3572 * flags_p if non-NULL is the address of various input and output flag bits
3573 * to the routine, as follows: ('I' means is input to the routine;
3574 * 'O' means output from the routine. Only flags marked O are
3575 * meaningful on return.)
3576 * _CORE_SWASH_INIT_USER_DEFINED_PROPERTY indicates if the swash
3577 * came from a user-defined property. (I O)
5d3d13d1
KW
3578 * _CORE_SWASH_INIT_RETURN_IF_UNDEF indicates that instead of croaking
3579 * when the swash cannot be located, to simply return NULL. (I)
87367d5f
KW
3580 * _CORE_SWASH_INIT_ACCEPT_INVLIST indicates that the caller will accept a
3581 * return of an inversion list instead of a swash hash if this routine
3582 * thinks that would result in faster execution of swash_fetch() later
3583 * on. (I)
9a53f6cf
KW
3584 *
3585 * Thus there are three possible inputs to find the swash: <name>,
3586 * <listsv>, and <invlist>. At least one must be specified. The result
3587 * will be the union of the specified ones, although <listsv>'s various
aabbdbda
KW
3588 * actions can intersect, etc. what <name> gives. To avoid going out to
3589 * disk at all, <invlist> should specify completely what the swash should
3590 * have, and <listsv> should be &PL_sv_undef and <name> should be "".
9a53f6cf
KW
3591 *
3592 * <invlist> is only valid for binary properties */
c4a5db0c 3593
2c1f00b9
YO
3594 PMOP *old_PL_curpm= PL_curpm; /* save away the old PL_curpm */
3595
c4a5db0c 3596 SV* retval = &PL_sv_undef;
83199d38 3597 HV* swash_hv = NULL;
87367d5f
KW
3598 const int invlist_swash_boundary =
3599 (flags_p && *flags_p & _CORE_SWASH_INIT_ACCEPT_INVLIST)
3600 ? 512 /* Based on some benchmarking, but not extensive, see commit
3601 message */
3602 : -1; /* Never return just an inversion list */
9a53f6cf
KW
3603
3604 assert(listsv != &PL_sv_undef || strNE(name, "") || invlist);
3605 assert(! invlist || minbits == 1);
3606
2c1f00b9
YO
3607 PL_curpm= NULL; /* reset PL_curpm so that we dont get confused between the regex
3608 that triggered the swash init and the swash init perl logic itself.
3609 See perl #122747 */
3610
9a53f6cf
KW
3611 /* If data was passed in to go out to utf8_heavy to find the swash of, do
3612 * so */
3613 if (listsv != &PL_sv_undef || strNE(name, "")) {
69794297
KW
3614 dSP;
3615 const size_t pkg_len = strlen(pkg);
3616 const size_t name_len = strlen(name);
3617 HV * const stash = gv_stashpvn(pkg, pkg_len, 0);
3618 SV* errsv_save;
3619 GV *method;
3620
3621 PERL_ARGS_ASSERT__CORE_SWASH_INIT;
3622
3623 PUSHSTACKi(PERLSI_MAGIC);
ce3b816e 3624 ENTER;
69794297 3625 SAVEHINTS();
2782061f 3626 save_re_context();
650f067c
JL
3627 /* We might get here via a subroutine signature which uses a utf8
3628 * parameter name, at which point PL_subname will have been set
3629 * but not yet used. */
3630 save_item(PL_subname);
69794297
KW
3631 if (PL_parser && PL_parser->error_count)
3632 SAVEI8(PL_parser->error_count), PL_parser->error_count = 0;
3633 method = gv_fetchmeth(stash, "SWASHNEW", 8, -1);
4a4088c4 3634 if (!method) { /* demand load UTF-8 */
69794297 3635 ENTER;
db2c6cb3
FC
3636 if ((errsv_save = GvSV(PL_errgv))) SAVEFREESV(errsv_save);
3637 GvSV(PL_errgv) = NULL;
1a419e6b 3638#ifndef NO_TAINT_SUPPORT
69794297
KW
3639 /* It is assumed that callers of this routine are not passing in
3640 * any user derived data. */
2782061f
DM
3641 /* Need to do this after save_re_context() as it will set
3642 * PL_tainted to 1 while saving $1 etc (see the code after getrx:
3643 * in Perl_magic_get). Even line to create errsv_save can turn on
3644 * PL_tainted. */
284167a5
SM
3645 SAVEBOOL(TAINT_get);
3646 TAINT_NOT;
3647#endif
69794297
KW
3648 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpvn(pkg,pkg_len),
3649 NULL);
eed484f9 3650 {
db2c6cb3
FC
3651 /* Not ERRSV, as there is no need to vivify a scalar we are
3652 about to discard. */
3653 SV * const errsv = GvSV(PL_errgv);
3654 if (!SvTRUE(errsv)) {
3655 GvSV(PL_errgv) = SvREFCNT_inc_simple(errsv_save);
3656 SvREFCNT_dec(errsv);
3657 }
eed484f9 3658 }
69794297
KW
3659 LEAVE;
3660 }
3661 SPAGAIN;
3662 PUSHMARK(SP);
3663 EXTEND(SP,5);
3664 mPUSHp(pkg, pkg_len);
3665 mPUSHp(name, name_len);
3666 PUSHs(listsv);
3667 mPUSHi(minbits);
3668 mPUSHi(none);
3669 PUTBACK;
db2c6cb3
FC
3670 if ((errsv_save = GvSV(PL_errgv))) SAVEFREESV(errsv_save);
3671 GvSV(PL_errgv) = NULL;
69794297
KW
3672 /* If we already have a pointer to the method, no need to use
3673 * call_method() to repeat the lookup. */
c41800a8
KW
3674 if (method
3675 ? call_sv(MUTABLE_SV(method), G_SCALAR)
69794297
KW
3676 : call_sv(newSVpvs_flags("SWASHNEW", SVs_TEMP), G_SCALAR | G_METHOD))
3677 {
3678 retval = *PL_stack_sp--;
3679 SvREFCNT_inc(retval);
3680 }
eed484f9 3681 {
db2c6cb3
FC
3682 /* Not ERRSV. See above. */
3683 SV * const errsv = GvSV(PL_errgv);
3684 if (!SvTRUE(errsv)) {
3685 GvSV(PL_errgv) = SvREFCNT_inc_simple(errsv_save);
3686 SvREFCNT_dec(errsv);
3687 }
eed484f9 3688 }
ce3b816e 3689 LEAVE;
69794297
KW
3690 POPSTACK;
3691 if (IN_PERL_COMPILETIME) {
3692 CopHINTS_set(PL_curcop, PL_hints);
3693 }
3694 if (!SvROK(retval) || SvTYPE(SvRV(retval)) != SVt_PVHV) {
d95e4a00 3695 if (SvPOK(retval)) {
69794297
KW
3696
3697 /* If caller wants to handle missing properties, let them */
5d3d13d1 3698 if (flags_p && *flags_p & _CORE_SWASH_INIT_RETURN_IF_UNDEF) {
2c1f00b9 3699 CORE_SWASH_INIT_RETURN(NULL);
69794297
KW
3700 }
3701 Perl_croak(aTHX_
147e3846 3702 "Can't find Unicode property definition \"%" SVf "\"",
69794297 3703 SVfARG(retval));
a25b5927 3704 NOT_REACHED; /* NOTREACHED */
d95e4a00 3705 }
69794297 3706 }
9a53f6cf 3707 } /* End of calling the module to find the swash */
36eb48b4 3708
83199d38
KW
3709 /* If this operation fetched a swash, and we will need it later, get it */
3710 if (retval != &PL_sv_undef
3711 && (minbits == 1 || (flags_p
3712 && ! (*flags_p
3713 & _CORE_SWASH_INIT_USER_DEFINED_PROPERTY))))
3714 {
3715 swash_hv = MUTABLE_HV(SvRV(retval));
3716
3717 /* If we don't already know that there is a user-defined component to
3718 * this swash, and the user has indicated they wish to know if there is
3719 * one (by passing <flags_p>), find out */
3720 if (flags_p && ! (*flags_p & _CORE_SWASH_INIT_USER_DEFINED_PROPERTY)) {
3721 SV** user_defined = hv_fetchs(swash_hv, "USER_DEFINED", FALSE);
3722 if (user_defined && SvUV(*user_defined)) {
3723 *flags_p |= _CORE_SWASH_INIT_USER_DEFINED_PROPERTY;
3724 }
3725 }
3726 }
3727
36eb48b4
KW
3728 /* Make sure there is an inversion list for binary properties */
3729 if (minbits == 1) {
3730 SV** swash_invlistsvp = NULL;
3731 SV* swash_invlist = NULL;
9a53f6cf 3732 bool invlist_in_swash_is_valid = FALSE;
02c85471
FC
3733 bool swash_invlist_unclaimed = FALSE; /* whether swash_invlist has
3734 an unclaimed reference count */
36eb48b4 3735
9a53f6cf 3736 /* If this operation fetched a swash, get its already existing
83199d38 3737 * inversion list, or create one for it */
36eb48b4 3738
83199d38 3739 if (swash_hv) {
5c9f4bd2 3740 swash_invlistsvp = hv_fetchs(swash_hv, "V", FALSE);
9a53f6cf
KW
3741 if (swash_invlistsvp) {
3742 swash_invlist = *swash_invlistsvp;
3743 invlist_in_swash_is_valid = TRUE;
3744 }
3745 else {
36eb48b4 3746 swash_invlist = _swash_to_invlist(retval);
02c85471 3747 swash_invlist_unclaimed = TRUE;
9a53f6cf
KW
3748 }
3749 }
3750
3751 /* If an inversion list was passed in, have to include it */
3752 if (invlist) {
3753