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regexec.c: Use withinCOUNT()
[perl5.git] / utf8.h
CommitLineData
a0ed51b3
LW		 1/* utf8.h
2 *
f3cb6f94
KW		 3 * This file contains definitions for use with the UTF-8 encoding. It
4 * actually also works with the variant UTF-8 encoding called UTF-EBCDIC, and
5 * hides almost all of the differences between these from the caller. In other
6 * words, someone should #include this file, and if the code is being compiled
7 * on an EBCDIC platform, things should mostly just work.
8 *
2eee27d7
SS		 9 * Copyright (C) 2000, 2001, 2002, 2005, 2006, 2007, 2009,
10 * 2010, 2011 by Larry Wall and others
a0ed51b3
LW		 11 *
12 * You may distribute under the terms of either the GNU General Public
13 * License or the Artistic License, as specified in the README file.
14 *
15 */
16
6a5bc5ac
KW		 17#ifndef PERL_UTF8_H_ /* Guard against recursive inclusion */
18#define PERL_UTF8_H_ 1
57f0e7e2 19
39e02b42 20/* Use UTF-8 as the default script encoding?
1e54db1a 21 * Turning this on will break scripts having non-UTF-8 binary
39e02b42
JH		 22 * data (such as Latin-1) in string literals. */
23#ifdef USE_UTF8_SCRIPTS
24# define USE_UTF8_IN_NAMES (!IN_BYTES)
25#else
26# define USE_UTF8_IN_NAMES (PL_hints & HINT_UTF8)
27#endif
28
3cd96634
KW		 29#include "regcharclass.h"
30#include "unicode_constants.h"
31
051a06d4 32/* For to_utf8_fold_flags, q.v. */
e4f4ef45
KW		 33#define FOLD_FLAGS_LOCALE 0x1
34#define FOLD_FLAGS_FULL 0x2
35#define FOLD_FLAGS_NOMIX_ASCII 0x4
051a06d4 36
7bbfa158
KW		 37/*
38=head1 Unicode Support
8cca77bc
KW		 39L<perlguts/Unicode Support> has an introduction to this API.
40
41See also L</Character classification>,
42and L</Character case changing>.
43Various functions outside this section also work specially with Unicode.
44Search for the string "utf8" in this document.
7bbfa158
KW		 45
46=for apidoc is_ascii_string
47
8871a094 48This is a misleadingly-named synonym for L</is_utf8_invariant_string>.
7bbfa158
KW		 49On ASCII-ish platforms, the name isn't misleading: the ASCII-range characters
50are exactly the UTF-8 invariants. But EBCDIC machines have more invariants
8871a094
KW		 51than just the ASCII characters, so C<is_utf8_invariant_string> is preferred.
52
53=for apidoc is_invariant_string
54
55This is a somewhat misleadingly-named synonym for L</is_utf8_invariant_string>.
56C<is_utf8_invariant_string> is preferred, as it indicates under what conditions
57the string is invariant.
7bbfa158
KW		 58
59=cut
60*/
8871a094
KW		 61#define is_ascii_string(s, len) is_utf8_invariant_string(s, len)
62#define is_invariant_string(s, len) is_utf8_invariant_string(s, len)
7bbfa158 63
33f38593
KW		 64#define uvoffuni_to_utf8_flags(d,uv,flags) \
65 uvoffuni_to_utf8_flags_msgs(d, uv, flags, 0)
de69f3af
KW		 66#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
67#define uvchr_to_utf8_flags(d,uv,flags) \
33f38593
KW		 68 uvchr_to_utf8_flags_msgs(d,uv,flags, 0)
69#define uvchr_to_utf8_flags_msgs(d,uv,flags,msgs) \
70 uvoffuni_to_utf8_flags_msgs(d,NATIVE_TO_UNI(uv),flags, msgs)
de69f3af 71#define utf8_to_uvchr_buf(s, e, lenp) \
9a9a6c98 72 utf8_to_uvchr_buf_helper((const U8 *) (s), (const U8 *) e, lenp)
f9380377
KW		 73#define utf8n_to_uvchr(s, len, lenp, flags) \
74 utf8n_to_uvchr_error(s, len, lenp, flags, 0)
37657a5b
KW		 75#define utf8n_to_uvchr_error(s, len, lenp, flags, errors) \
76 utf8n_to_uvchr_msgs(s, len, lenp, flags, errors, 0)
de69f3af 77
a0270393 78#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
a239b1e2 79
eda9cac1
KW		 80#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
81 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 82#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 83#define FOLDEQ_LOCALE (1 << 1)
18f762c3
KW		 84#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
85#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
d635b710
KW		 86#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
87#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 88
e6226b18
KW		 89#define ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
90 cBOOL(! foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2))
91
1d72bdf6
NIS		 92#ifdef EBCDIC
93/* The equivalent of these macros but implementing UTF-EBCDIC
94 are in the following header file:
95 */
96
97#include "utfebcdic.h"
fd7cb289 98
d06134e5 99#else /* ! EBCDIC */
73c4f7a1
GS		 100START_EXTERN_C
101
f4d83e55
KW		 102/*
103
104=for apidoc AmnU|STRLEN|UTF8_MAXBYTES
105
106The maximum width of a single UTF-8 encoded character, in bytes.
107
108NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
109is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
110expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
111non-negative integers in a binary format, even those above Unicode.
112
113=cut
114 */
111e8ed9
KW		 115#define UTF8_MAXBYTES 13
116
a0ed51b3 117#ifdef DOINIT
6f06b55f 118EXTCONST unsigned char PL_utf8skip[] = {
b2635aa8
KW		 119/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
120/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
121/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
122/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
123/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
124/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
125/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
126/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
127/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
128/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
129/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
130/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
131/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 132/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
b2635aa8
KW		 133/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
134/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
135/* 0xF0 */ 4,4,4,4,4,4,4,4,5,5,5,5,6,6, /* above BMP to 2**31 - 1 */
6937f885
KW		 136 /* Perl extended (never was official UTF-8). Up to 36 bit */
137/* 0xFE */ 7,
138 /* More extended, Up to 72 bits (64-bit + reserved) */
111e8ed9 139/* 0xFF */ UTF8_MAXBYTES
a0ed51b3
LW		 140};
141#else
6f06b55f 142EXTCONST unsigned char PL_utf8skip[];
a0ed51b3
LW		 143#endif
144
73c4f7a1 145END_EXTERN_C
7e2040f0 146
ef2a4c8f
KW		 147/*
148
149=for apidoc Am|U8|NATIVE_TO_LATIN1|U8 ch
150
151Returns the Latin-1 (including ASCII and control characters) equivalent of the
152input native code point given by C<ch>. Thus, C<NATIVE_TO_LATIN1(193)> on
153EBCDIC platforms returns 65. These each represent the character C<"A"> on
154their respective platforms. On ASCII platforms no conversion is needed, so
155this macro expands to just its input, adding no time nor space requirements to
156the implementation.
157
158For conversion of code points potentially larger than will fit in a character,
159use L</NATIVE_TO_UNI>.
160
161=for apidoc Am|U8|LATIN1_TO_NATIVE|U8 ch
162
163Returns the native equivalent of the input Latin-1 code point (including ASCII
164and control characters) given by C<ch>. Thus, C<LATIN1_TO_NATIVE(66)> on
165EBCDIC platforms returns 194. These each represent the character C<"B"> on
166their respective platforms. On ASCII platforms no conversion is needed, so
167this macro expands to just its input, adding no time nor space requirements to
168the implementation.
169
170For conversion of code points potentially larger than will fit in a character,
171use L</UNI_TO_NATIVE>.
172
173=for apidoc Am|UV|NATIVE_TO_UNI|UV ch
174
175Returns the Unicode equivalent of the input native code point given by C<ch>.
176Thus, C<NATIVE_TO_UNI(195)> on EBCDIC platforms returns 67. These each
177represent the character C<"C"> on their respective platforms. On ASCII
178platforms no conversion is needed, so this macro expands to just its input,
179adding no time nor space requirements to the implementation.
180
181=for apidoc Am|UV|UNI_TO_NATIVE|UV ch
182
183Returns the native equivalent of the input Unicode code point given by C<ch>.
184Thus, C<UNI_TO_NATIVE(68)> on EBCDIC platforms returns 196. These each
185represent the character C<"D"> on their respective platforms. On ASCII
186platforms no conversion is needed, so this macro expands to just its input,
187adding no time nor space requirements to the implementation.
188
189=cut
190*/
191
e7ae132e
KW		 192#define NATIVE_TO_LATIN1(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
193#define LATIN1_TO_NATIVE(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
59a449d5
KW		 194
195/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
196 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
197 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
198 * because they are 8-bit encodings that serve the same purpose in Perl, and
199 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
200 * whichever one is applicable on the current platform */
cb15eeb2
KW		 201#define NATIVE_UTF8_TO_I8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
202#define I8_TO_NATIVE_UTF8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
59a449d5 203
cb15eeb2
KW		 204#define UNI_TO_NATIVE(ch) ((UV) ((ch) | 0))
205#define NATIVE_TO_UNI(ch) ((UV) ((ch) | 0))
d7578b48 206
877d9f0d 207/*
9041c2e3 208
a14e0a36
KW		 209 The following table is from Unicode 3.2, plus the Perl extensions for above
210 U+10FFFF
877d9f0d 211
a14e0a36 212 Code Points 1st Byte 2nd Byte 3rd 4th 5th 6th 7th 8th-13th
877d9f0d 213
375122d7 214 U+0000..U+007F 00..7F
e1b711da 215 U+0080..U+07FF * C2..DF 80..BF
a14e0a36
KW		 216 U+0800..U+0FFF E0 * A0..BF 80..BF
217 U+1000..U+CFFF E1..EC 80..BF 80..BF
218 U+D000..U+D7FF ED 80..9F 80..BF
219 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
220 U+E000..U+FFFF EE..EF 80..BF 80..BF
221 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
222 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
223 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
224 Below are above-Unicode code points
225 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
226 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
227 U+200000..U+FFFFFF F8 * 88..BF 80..BF 80..BF 80..BF
228U+1000000..U+3FFFFFF F9..FB 80..BF 80..BF 80..BF 80..BF
229U+4000000..U+3FFFFFFF FC * 84..BF 80..BF 80..BF 80..BF 80..BF
230U+40000000..U+7FFFFFFF FD 80..BF 80..BF 80..BF 80..BF 80..BF
231U+80000000..U+FFFFFFFFF FE * 82..BF 80..BF 80..BF 80..BF 80..BF 80..BF
232U+1000000000.. FF 80..BF 80..BF 80..BF 80..BF 80..BF * 81..BF 80..BF
877d9f0d 233
e1b711da 234Note the gaps before several of the byte entries above marked by '*'. These are
37e2e78e
KW		 235caused by legal UTF-8 avoiding non-shortest encodings: it is technically
236possible to UTF-8-encode a single code point in different ways, but that is
237explicitly forbidden, and the shortest possible encoding should always be used
15824458 238(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 239
877d9f0d
JH		 240 */
241
8c007b5a
JH		 242/*
243 Another way to look at it, as bits:
244
b2635aa8 245 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 246
b2635aa8
KW		 247 0aaa aaaa 0aaa aaaa
248 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
249 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
250 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
8c007b5a
JH		 251
252As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 253leading bits of the start byte tell how many bytes there are in the
8c007b5a
JH		 254encoded character.
255
df863e43
KW		 256Perl's extended UTF-8 means we can have start bytes up through FF, though any
257beginning with FF yields a code point that is too large for 32-bit ASCII
258platforms. FF signals to use 13 bytes for the encoded character. This breaks
259the paradigm that the number of leading bits gives how many total bytes there
ab2e28c2 260are in the character. */
38953e5a 261
15824458
KW		 262/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
263 * sequence contributes to the specification of the code point. In the bit
264 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
265 * real information */
1d72bdf6 266#define UTF_ACCUMULATION_SHIFT 6
b2635aa8 267
fed423a5
KW		 268/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
269 * for more */
270#define QUESTION_MARK_CTRL DEL_NATIVE
271
272/* Surrogates, non-character code points and above-Unicode code points are
273 * problematic in some contexts. This allows code that needs to check for
a3815e44 274 * those to quickly exclude the vast majority of code points it will
fed423a5 275 * encounter */
a6951642
KW		 276#define isUTF8_POSSIBLY_PROBLEMATIC(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
277 (U8) c >= 0xED)
fed423a5 278
57ff5f59
KW		 279#define UNICODE_IS_PERL_EXTENDED(uv) UNLIKELY((UV) (uv) > 0x7FFFFFFF)
280
fed423a5
KW		 281#endif /* EBCDIC vs ASCII */
282
d7bcd45a
KW		 283/* 2**UTF_ACCUMULATION_SHIFT - 1. This masks out all but the bits that carry
284 * real information in a continuation byte. This turns out to be 0x3F in
285 * UTF-8, 0x1F in UTF-EBCDIC. */
d223e1ea 286#define UTF_CONTINUATION_MASK ((U8) (nBIT_MASK(UTF_ACCUMULATION_SHIFT)))
fed423a5 287
9f3cfb7a
KW		 288/* For use in UTF8_IS_CONTINUATION(). This turns out to be 0xC0 in UTF-8,
289 * E0 in UTF-EBCDIC */
290#define UTF_IS_CONTINUATION_MASK ((U8) (0xFF << UTF_ACCUMULATION_SHIFT))
291
38f458ff
KW		 292/* This defines the bits that are to be in the continuation bytes of a
293 * multi-byte UTF-8 encoded character that mark it is a continuation byte.
294 * This turns out to be 0x80 in UTF-8, 0xA0 in UTF-EBCDIC. (khw doesn't know
295 * the underlying reason that B0 works here) */
296#define UTF_CONTINUATION_MARK (UTF_IS_CONTINUATION_MASK & 0xB0)
297
f4225fa0
KW		 298/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
299 * first byte thereof? */
300#define UTF8_IS_CONTINUATION(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
301 (((NATIVE_UTF8_TO_I8(c) & UTF_IS_CONTINUATION_MASK) \
302 == UTF_CONTINUATION_MARK)))
303
2dc97505
KW		 304/* Is the representation of the Unicode code point 'cp' the same regardless of
305 * being encoded in UTF-8 or not? This is a fundamental property of
306 * UTF-8,EBCDIC */
307#define OFFUNI_IS_INVARIANT(c) (((WIDEST_UTYPE)(c)) < UTF_CONTINUATION_MARK)
308
ab2e28c2
KW		 309/*
310=for apidoc Am|bool|UVCHR_IS_INVARIANT|UV cp
311
312Evaluates to 1 if the representation of code point C<cp> is the same whether or
313not it is encoded in UTF-8; otherwise evaluates to 0. UTF-8 invariant
314characters can be copied as-is when converting to/from UTF-8, saving time.
315C<cp> is Unicode if above 255; otherwise is platform-native.
316
317=cut
318 */
319#define UVCHR_IS_INVARIANT(cp) (OFFUNI_IS_INVARIANT(NATIVE_TO_UNI(cp)))
320
7028aeba
KW		 321/* Internal macro to be used only in this file to aid in constructing other
322 * publicly accessible macros.
323 * The number of bytes required to express this uv in UTF-8, for just those
324 * uv's requiring 2 through 6 bytes, as these are common to all platforms and
325 * word sizes. The number of bytes needed is given by the number of leading 1
326 * bits in the start byte. There are 32 start bytes that have 2 initial 1 bits
327 * (C0-DF); there are 16 that have 3 initial 1 bits (E0-EF); 8 that have 4
328 * initial 1 bits (F0-F8); 4 that have 5 initial 1 bits (F9-FB), and 2 that
329 * have 6 initial 1 bits (FC-FD). The largest number a string of n bytes can
330 * represent is (the number of possible start bytes for 'n')
331 * * (the number of possiblities for each start byte
332 * The latter in turn is
333 * 2 ** ( (how many continuation bytes there are)
334 * * (the number of bits of information each
335 * continuation byte holds))
336 *
337 * If we were on a platform where we could use a fast find first set bit
338 * instruction (or count leading zeros instruction) this could be replaced by
339 * using that to find the log2 of the uv, and divide that by the number of bits
340 * of information in each continuation byte, adjusting for large cases and how
341 * much information is in a start byte for that length */
72164d3a 342#define __COMMON_UNI_SKIP(uv) \
7028aeba
KW		 343 (UV) (uv) < (32 * (1U << ( UTF_ACCUMULATION_SHIFT))) ? 2 : \
344 (UV) (uv) < (16 * (1U << (2 * UTF_ACCUMULATION_SHIFT))) ? 3 : \
345 (UV) (uv) < ( 8 * (1U << (3 * UTF_ACCUMULATION_SHIFT))) ? 4 : \
346 (UV) (uv) < ( 4 * (1U << (4 * UTF_ACCUMULATION_SHIFT))) ? 5 : \
347 (UV) (uv) < ( 2 * (1U << (5 * UTF_ACCUMULATION_SHIFT))) ? 6 :
72164d3a
KW		 348
349/* Internal macro to be used only in this file.
350 * This adds to __COMMON_UNI_SKIP the details at this platform's upper range.
fed423a5 351 * For any-sized EBCDIC platforms, or 64-bit ASCII ones, we need one more test
72164d3a
KW		 352 * to see if just 7 bytes is needed, or if the maximum is needed. For 32-bit
353 * ASCII platforms, everything is representable by 7 bytes */
fed423a5 354#if defined(UV_IS_QUAD) || defined(EBCDIC)
72164d3a 355# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) \
8974941d
KW		 356 LIKELY((UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT))) \
357 ? 7 \
358 : UTF8_MAXBYTES)
1d68d6cd 359#else
72164d3a 360# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
1d68d6cd
SC		 361#endif
362
fed423a5
KW		 363/* The next two macros use the base macro defined above, and add in the tests
364 * at the low-end of the range, for just 1 byte, yielding complete macros,
365 * publicly accessible. */
366
367/* Input is a true Unicode (not-native) code point */
368#define OFFUNISKIP(uv) (OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
2084b489 369
5352a763
KW		 370/*
371
372=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
373returns the number of bytes required to represent the code point C<cp> when
374encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
375255; a Unicode code point otherwise.
376
377=cut
378 */
fdb6583d 379#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 380
4bab39bc
KW		 381#define UTF_MIN_START_BYTE \
382 ((UTF_CONTINUATION_MARK >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
383
384/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
59645eb1 385 * This excludes invariants (they are single-byte). It also excludes the
4bab39bc 386 * illegal overlong sequences that begin with C0 and C1 on ASCII platforms, and
59645eb1
KW		 387 * C0-C4 I8 start bytes on EBCDIC ones. On EBCDIC E0 can't start a
388 * non-overlong sequence, so we define a base macro and for those platforms,
389 * extend it to also exclude E0 */
390#define UTF8_IS_START_base(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4bab39bc 391 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_START_BYTE))
59645eb1
KW		 392#ifdef EBCDIC
393# define UTF8_IS_START(c) \
394 (UTF8_IS_START_base(c) && (c) != I8_TO_NATIVE_UTF8(0xE0))
395#else
396# define UTF8_IS_START(c) UTF8_IS_START_base(c)
397#endif
4bab39bc 398
1df63428
KW		 399#define UTF_MIN_ABOVE_LATIN1_BYTE \
400 ((0x100 >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
401
402/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
403 * represent a code point > 255? */
404#define UTF8_IS_ABOVE_LATIN1(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
405 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_ABOVE_LATIN1_BYTE))
406
7c88d61e
KW		 407/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
408 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
409 * be well-formed. */
410#define UTF8_IS_DOWNGRADEABLE_START(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
411 inRANGE(NATIVE_UTF8_TO_I8(c), \
412 UTF_MIN_START_BYTE, UTF_MIN_ABOVE_LATIN1_BYTE - 1))
413
b651802e
KW		 414/* The largest code point representable by two UTF-8 bytes on this platform.
415 * As explained in the comments for __COMMON_UNI_SKIP, 32 start bytes with
fed423a5 416 * UTF_ACCUMULATION_SHIFT bits of information each */
aa206fb7
KW		 417#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
418
b651802e
KW		 419/* The largest code point representable by two UTF-8 bytes on any platform that
420 * Perl runs on. This value is constrained by EBCDIC which has 5 bits per
421 * continuation byte */
924b0bfd 422#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * nBIT_UMAX(5))
aa206fb7 423
f2c50040
KW		 424/*
425
426=for apidoc AmnU|STRLEN|UTF8_MAXBYTES_CASE
427
428The maximum number of UTF-8 bytes a single Unicode character can
429uppercase/lowercase/titlecase/fold into.
430
431=cut
432
433 * Unicode guarantees that the maximum expansion is UTF8_MAX_FOLD_CHAR_EXPAND
434 * characters, but any above-Unicode code point will fold to itself, so we only
435 * have to look at the expansion of the maximum Unicode code point. But this
436 * number may be less than the space occupied by a very large code point under
437 * Perl's extended UTF-8. We have to make it large enough to fit any single
438 * character. (It turns out that ASCII and EBCDIC differ in which is larger)
439 *
440=cut
441*/
c03c0950 442#define UTF8_MAXBYTES_CASE \
ae9a9edb 443 MAX(UTF8_MAXBYTES, UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF))
c03c0950 444
d06134e5
KW		 445/* Rest of these are attributes of Unicode and perl's internals rather than the
446 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
447 * this level; the macros that some of these call may have different
448 * definitions in the two encodings */
449
59a449d5
KW		 450/* In domain restricted to ASCII, these may make more sense to the reader than
451 * the ones with Latin1 in the name */
452#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
453#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
454
455/* More or less misleadingly-named defines, retained for back compat */
456#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
457#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
458#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
459#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
460#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 461
c0236afe 462/* This defines the 1-bits that are to be in the first byte of a multi-byte
97d0ceda
KW		 463 * UTF-8 encoded character that mark it as a start byte and give the number of
464 * bytes that comprise the character. 'len' is the number of bytes in the
465 * multi-byte sequence. */
8974941d
KW		 466#define UTF_START_MARK(len) (UNLIKELY((len) > 7) \
467 ? 0xFF \
468 : ((U8) (0xFE << (7-(len)))))
c0236afe
KW		 469
470/* Masks out the initial one bits in a start byte, leaving the real data ones.
471 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
472 * multi-byte sequence that comprises the character. */
8974941d 473#define UTF_START_MASK(len) (UNLIKELY((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
c0236afe 474
537124e4
KW		 475/* Adds a UTF8 continuation byte 'new' of information to a running total code
476 * point 'old' of all the continuation bytes so far. This is designed to be
155d2738
KW		 477 * used in a loop to convert from UTF-8 to the code point represented. Note
478 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
479 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
480 * code point in process of being generated */
a6951642
KW		 481#define UTF8_ACCUMULATE(old, new) (__ASSERT_(FITS_IN_8_BITS(new)) \
482 ((old) << UTF_ACCUMULATION_SHIFT) \
009097b1 483 | ((NATIVE_UTF8_TO_I8(new)) \
155d2738 484 & UTF_CONTINUATION_MASK))
d06134e5 485
4ab10950 486/* This works in the face of malformed UTF-8. */
4e1ed312
KW		 487#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) \
488 ( UTF8_IS_DOWNGRADEABLE_START(*(s)) \
489 && ( (e) - (s) > 1) \
490 && UTF8_IS_CONTINUATION(*((s)+1)))
4ab10950 491
5aaebcb3 492/* Number of bytes a code point occupies in UTF-8. */
5352a763 493#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 494
5aaebcb3
KW		 495/* Most code which says UNISKIP is really thinking in terms of native code
496 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 497 * it means existing code continues to work. For precision, use UVCHR_SKIP,
5352a763
KW		 498 * NATIVE_SKIP, or OFFUNISKIP */
499#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 500
3c0792e4
KW		 501/* Longer, but more accurate name */
502#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
503
a62b247b
KW		 504/* Convert a UTF-8 variant Latin1 character to a native code point value.
505 * Needs just one iteration of accumulate. Should be used only if it is known
506 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
507 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
508 * representable by two bytes (which turns out to be up through
509 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
510 * HI: a downgradable start byte;
511 * LO: continuation.
512 * */
513#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
514 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
515 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
516 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
517 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
518
94bb8c36 519/* Convert a two (not one) byte utf8 character to a native code point value.
2950f2a7
KW		 520 * Needs just one iteration of accumulate. Should not be used unless it is
521 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
522 * Note that the result can be larger than 255 if the input character is not
523 * downgradable */
94bb8c36 524#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
a6951642
KW		 525 (__ASSERT_(FITS_IN_8_BITS(HI)) \
526 __ASSERT_(FITS_IN_8_BITS(LO)) \
527 __ASSERT_(PL_utf8skip[HI] == 2) \
528 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 529 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 530 (LO))))
94bb8c36
KW		 531
532/* Should never be used, and be deprecated */
533#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 534
bd18bd40
KW		 535/*
536
537=for apidoc Am|STRLEN|UTF8SKIP|char* s
ee0ff0f5
KW		 538returns the number of bytes a non-malformed UTF-8 encoded character whose first
539(perhaps only) byte is pointed to by C<s>.
540
541If there is a possibility of malformed input, use instead:
542
543=over
544
545=item L</C<UTF8_SAFE_SKIP>> if you know the maximum ending pointer in the
546buffer pointed to by C<s>; or
547
548=item L</C<UTF8_CHK_SKIP>> if you don't know it.
549
550=back
551
552It is better to restructure your code so the end pointer is passed down so that
553you know what it actually is at the point of this call, but if that isn't
554possible, L</C<UTF8_CHK_SKIP>> can minimize the chance of accessing beyond the end
555of the input buffer.
bd18bd40
KW		 556
557=cut
558 */
2a70536e 559#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
a281f16c
KW		 560
561/*
562=for apidoc Am|STRLEN|UTF8_SKIP|char* s
563This is a synonym for L</C<UTF8SKIP>>
564
565=cut
566*/
567
2a70536e 568#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 569
85fcc8f2 570/*
ee0ff0f5
KW		 571=for apidoc Am|STRLEN|UTF8_CHK_SKIP|char* s
572
573This is a safer version of L</C<UTF8SKIP>>, but still not as safe as
574L</C<UTF8_SAFE_SKIP>>. This version doesn't blindly assume that the input
575string pointed to by C<s> is well-formed, but verifies that there isn't a NUL
576terminating character before the expected end of the next character in C<s>.
577The length C<UTF8_CHK_SKIP> returns stops just before any such NUL.
578
579Perl tends to add NULs, as an insurance policy, after the end of strings in
580SV's, so it is likely that using this macro will prevent inadvertent reading
581beyond the end of the input buffer, even if it is malformed UTF-8.
582
583This macro is intended to be used by XS modules where the inputs could be
584malformed, and it isn't feasible to restructure to use the safer
585L</C<UTF8_SAFE_SKIP>>, for example when interfacing with a C library.
586
587=cut
588*/
589
590#define UTF8_CHK_SKIP(s) \
8974941d 591 (UNLIKELY(s[0] == '\0') ? 1 : MIN(UTF8SKIP(s), \
f87d8789 592 my_strnlen((char *) (s), UTF8SKIP(s))))
ee0ff0f5 593/*
85fcc8f2
KW		 594
595=for apidoc Am|STRLEN|UTF8_SAFE_SKIP|char* s|char* e
45671da2
KW		 596returns 0 if S<C<s E<gt>= e>>; otherwise returns the number of bytes in the
597UTF-8 encoded character whose first byte is pointed to by C<s>. But it never
598returns beyond C<e>. On DEBUGGING builds, it asserts that S<C<s E<lt>= e>>.
85fcc8f2
KW		 599
600=cut
601 */
45671da2 602#define UTF8_SAFE_SKIP(s, e) (__ASSERT_((e) >= (s)) \
8974941d 603 UNLIKELY(((e) - (s)) <= 0) \
45671da2
KW		 604 ? 0 \
605 : MIN(((e) - (s)), UTF8_SKIP(s)))
85fcc8f2 606
2d1545e5
KW		 607/* Most code that says 'UNI_' really means the native value for code points up
608 * through 255 */
609#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
610
c2b32798
KW		 611/*
612=for apidoc Am|bool|UTF8_IS_INVARIANT|char c
613
614Evaluates to 1 if the byte C<c> represents the same character when encoded in
615UTF-8 as when not; otherwise evaluates to 0. UTF-8 invariant characters can be
616copied as-is when converting to/from UTF-8, saving time.
617
618In spite of the name, this macro gives the correct result if the input string
619from which C<c> comes is not encoded in UTF-8.
620
621See C<L</UVCHR_IS_INVARIANT>> for checking if a UV is invariant.
622
623=cut
624
625The reason it works on both UTF-8 encoded strings and non-UTF-8 encoded, is
626that it returns TRUE in each for the exact same set of bit patterns. It is
627valid on a subset of what UVCHR_IS_INVARIANT is valid on, so can just use that;
628and the compiler should optimize out anything extraneous given the
629implementation of the latter. The |0 makes sure this isn't mistakenly called
630with a ptr argument.
631*/
5c06326b 632#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT((c) | 0)
5fc230f1
KW		 633
634/* Like the above, but its name implies a non-UTF8 input, which as the comments
635 * above show, doesn't matter as to its implementation */
38953e5a 636#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 637
2c03e801
KW		 638/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
639 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT. */
640#define UTF8_IS_CONTINUED(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
641 (! UTF8_IS_INVARIANT(c)))
642
48ccf5e1
KW		 643/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
644 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
645 * it must be less than 0x3FF to work across both encodings. */
646
647/* These two are helper macros for the other three sets, and should not be used
648 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
1ff3baa2
KW		 649 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
650 * for any code point */
48ccf5e1 651#define __BASE_TWO_BYTE_HI(c, translate_function) \
2863dafa 652 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 653 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
2863dafa 654 | UTF_START_MARK(2)))
48ccf5e1 655#define __BASE_TWO_BYTE_LO(c, translate_function) \
2863dafa 656 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 657 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
2863dafa 658 | UTF_CONTINUATION_MARK))
48ccf5e1 659
48ccf5e1
KW		 660/* The next two macros should not be used. They were designed to be usable as
661 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 662 * regen/unicode_constants.pl instead */
48ccf5e1
KW		 663#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
664#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
665
666/* The next two macros are used when the source should be a single byte
667 * character; checked for under DEBUGGING */
668#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 669 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 670#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 671 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
48ccf5e1
KW		 672
673/* These final two macros in the series are used when the source can be any
674 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
675 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
676 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 677 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
48ccf5e1
KW		 678 * places, so the ~ works */
679#define UTF8_TWO_BYTE_HI(c) \
680 (__ASSERT_((sizeof(c) == 1) \
d52b8576 681 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 682 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
48ccf5e1
KW		 683#define UTF8_TWO_BYTE_LO(c) \
684 (__ASSERT_((sizeof(c) == 1) \
d52b8576 685 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 686 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 687
e7214ce8
KW		 688/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
689 * as it is only in overlongs. */
690#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
691
7e2040f0 692/*
e3036cf4 693 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
20df05f4
KW		 694 * from an earlier version of these macros in which they didn't call the
695 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
696 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
697 * no need to do it again here
7e2040f0 698 */
da8c1a98
KW		 699#define isIDFIRST_lazy_if_safe(p, e, UTF) \
700 ((IN_BYTES || !UTF) \
701 ? isIDFIRST(*(p)) \
702 : isIDFIRST_utf8_safe(p, e))
da8c1a98
KW		 703#define isWORDCHAR_lazy_if_safe(p, e, UTF) \
704 ((IN_BYTES || !UTF) \
705 ? isWORDCHAR(*(p)) \
706 : isWORDCHAR_utf8_safe((U8 *) p, (U8 *) e))
4c1d9526 707#define isALNUM_lazy_if_safe(p, e, UTF) isWORDCHAR_lazy_if_safe(p, e, UTF)
da8c1a98 708
89ebb4a3
JH		 709#define UTF8_MAXLEN UTF8_MAXBYTES
710
8cb75cc8
KW		 711/* A Unicode character can fold to up to 3 characters */
712#define UTF8_MAX_FOLD_CHAR_EXPAND 3
713
d3481830 714#define IN_BYTES UNLIKELY(CopHINTS_get(PL_curcop) & HINT_BYTES)
bd18bd40
KW		 715
716/*
717
718=for apidoc Am|bool|DO_UTF8|SV* sv
719Returns a bool giving whether or not the PV in C<sv> is to be treated as being
720encoded in UTF-8.
721
722You should use this I<after> a call to C<SvPV()> or one of its variants, in
723case any call to string overloading updates the internal UTF-8 encoding flag.
724
725=cut
726*/
0064a8a9 727#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
1ff3baa2
KW		 728
729/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
730 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
731 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
732 * could be */
70844984
KW		 733#define IN_UNI_8_BIT \
734 (( ( (CopHINTS_get(PL_curcop) & HINT_UNI_8_BIT)) \
735 || ( CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
736 /* -1 below is for :not_characters */ \
737 && _is_in_locale_category(FALSE, -1))) \
738 && (! IN_BYTES))
b36bf33f 739
1d72bdf6 740
c76687c5 741#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
2b5e7bc2 742#define UTF8_GOT_EMPTY UTF8_ALLOW_EMPTY
c76687c5
KW		 743
744/* Allow first byte to be a continuation byte */
1d72bdf6 745#define UTF8_ALLOW_CONTINUATION 0x0002
2b5e7bc2 746#define UTF8_GOT_CONTINUATION UTF8_ALLOW_CONTINUATION
c76687c5 747
cd01d3b1 748/* Unexpected non-continuation byte */
1d72bdf6 749#define UTF8_ALLOW_NON_CONTINUATION 0x0004
2b5e7bc2 750#define UTF8_GOT_NON_CONTINUATION UTF8_ALLOW_NON_CONTINUATION
949cf498
KW		 751
752/* expecting more bytes than were available in the string */
753#define UTF8_ALLOW_SHORT 0x0008
2b5e7bc2 754#define UTF8_GOT_SHORT UTF8_ALLOW_SHORT
949cf498 755
94953955
KW		 756/* Overlong sequence; i.e., the code point can be specified in fewer bytes.
757 * First one will convert the overlong to the REPLACEMENT CHARACTER; second
758 * will return what the overlong evaluates to */
949cf498 759#define UTF8_ALLOW_LONG 0x0010
94953955 760#define UTF8_ALLOW_LONG_AND_ITS_VALUE (UTF8_ALLOW_LONG|0x0020)
2b5e7bc2
KW		 761#define UTF8_GOT_LONG UTF8_ALLOW_LONG
762
d60baaa7
KW		 763#define UTF8_ALLOW_OVERFLOW 0x0080
764#define UTF8_GOT_OVERFLOW UTF8_ALLOW_OVERFLOW
949cf498 765
f180b292 766#define UTF8_DISALLOW_SURROGATE 0x0100 /* Unicode surrogates */
2b5e7bc2 767#define UTF8_GOT_SURROGATE UTF8_DISALLOW_SURROGATE
f180b292 768#define UTF8_WARN_SURROGATE 0x0200
949cf498 769
c4e96019
KW		 770/* Unicode non-character code points */
771#define UTF8_DISALLOW_NONCHAR 0x0400
2b5e7bc2 772#define UTF8_GOT_NONCHAR UTF8_DISALLOW_NONCHAR
c4e96019 773#define UTF8_WARN_NONCHAR 0x0800
949cf498 774
c4e96019
KW		 775/* Super-set of Unicode: code points above the legal max */
776#define UTF8_DISALLOW_SUPER 0x1000
2b5e7bc2 777#define UTF8_GOT_SUPER UTF8_DISALLOW_SUPER
c4e96019
KW		 778#define UTF8_WARN_SUPER 0x2000
779
780/* The original UTF-8 standard did not define UTF-8 with start bytes of 0xFE or
781 * 0xFF, though UTF-EBCDIC did. This allowed both versions to represent code
782 * points up to 2 ** 31 - 1. Perl extends UTF-8 so that 0xFE and 0xFF are
783 * usable on ASCII platforms, and 0xFF means something different than
784 * UTF-EBCDIC defines. These changes allow code points of 64 bits (actually
785 * somewhat more) to be represented on both platforms. But these are Perl
786 * extensions, and not likely to be interchangeable with other languages. Note
787 * that on ASCII platforms, FE overflows a signed 32-bit word, and FF an
788 * unsigned one. */
d044b7a7
KW		 789#define UTF8_DISALLOW_PERL_EXTENDED 0x4000
790#define UTF8_GOT_PERL_EXTENDED UTF8_DISALLOW_PERL_EXTENDED
791#define UTF8_WARN_PERL_EXTENDED 0x8000
d35f2ca5 792
57ff5f59
KW		 793/* For back compat, these old names are misleading for overlongs and
794 * UTF_EBCDIC. */
d044b7a7
KW		 795#define UTF8_DISALLOW_ABOVE_31_BIT UTF8_DISALLOW_PERL_EXTENDED
796#define UTF8_GOT_ABOVE_31_BIT UTF8_GOT_PERL_EXTENDED
797#define UTF8_WARN_ABOVE_31_BIT UTF8_WARN_PERL_EXTENDED
798#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_PERL_EXTENDED
799#define UTF8_WARN_FE_FF UTF8_WARN_PERL_EXTENDED
949cf498 800
f180b292 801#define UTF8_CHECK_ONLY 0x10000
99a765e9 802#define _UTF8_NO_CONFIDENCE_IN_CURLEN 0x20000 /* Internal core use only */
949cf498
KW		 803
804/* For backwards source compatibility. They do nothing, as the default now
805 * includes what they used to mean. The first one's meaning was to allow the
806 * just the single non-character 0xFFFF */
807#define UTF8_ALLOW_FFFF 0
c825ef8c 808#define UTF8_ALLOW_FE_FF 0
949cf498
KW		 809#define UTF8_ALLOW_SURROGATE 0
810
ecc1615f
KW		 811/* C9 refers to Unicode Corrigendum #9: allows but discourages non-chars */
812#define UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE \
813 (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_SURROGATE)
814#define UTF8_WARN_ILLEGAL_C9_INTERCHANGE (UTF8_WARN_SUPER|UTF8_WARN_SURROGATE)
815
d35f2ca5 816#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 817 (UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE|UTF8_DISALLOW_NONCHAR)
949cf498 818#define UTF8_WARN_ILLEGAL_INTERCHANGE \
ecc1615f
KW		 819 (UTF8_WARN_ILLEGAL_C9_INTERCHANGE|UTF8_WARN_NONCHAR)
820
0eb3d6a0
KW		 821/* This is typically used for code that processes UTF-8 input and doesn't want
822 * to have to deal with any malformations that might be present. All such will
823 * be safely replaced by the REPLACEMENT CHARACTER, unless other flags
824 * overriding this are also present. */
2d532c27
KW		 825#define UTF8_ALLOW_ANY ( UTF8_ALLOW_CONTINUATION \
826 |UTF8_ALLOW_NON_CONTINUATION \
827 |UTF8_ALLOW_SHORT \
d60baaa7
KW		 828 |UTF8_ALLOW_LONG \
829 |UTF8_ALLOW_OVERFLOW)
2d532c27
KW		 830
831/* Accept any Perl-extended UTF-8 that evaluates to any UV on the platform, but
cd01d3b1 832 * not any malformed. This is the default. */
2d532c27
KW		 833#define UTF8_ALLOW_ANYUV 0
834#define UTF8_ALLOW_DEFAULT UTF8_ALLOW_ANYUV
1d72bdf6 835
89d986df
KW		 836/*
837=for apidoc Am|bool|UTF8_IS_SURROGATE|const U8 *s|const U8 *e
838
839Evaluates to non-zero if the first few bytes of the string starting at C<s> and
840looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
841of the Unicode surrogate code points; otherwise it evaluates to 0. If
842non-zero, the value gives how many bytes starting at C<s> comprise the code
843point's representation.
844
845=cut
846 */
847#define UTF8_IS_SURROGATE(s, e) is_SURROGATE_utf8_safe(s, e)
848
849
850#define UTF8_IS_REPLACEMENT(s, send) is_REPLACEMENT_utf8_safe(s,send)
851
285aa1f0 852#define MAX_LEGAL_CP ((UV)IV_MAX)
40606899 853
89d986df
KW		 854/*
855=for apidoc Am|bool|UTF8_IS_SUPER|const U8 *s|const U8 *e
856
857Recall that Perl recognizes an extension to UTF-8 that can encode code
858points larger than the ones defined by Unicode, which are 0..0x10FFFF.
859
860This macro evaluates to non-zero if the first few bytes of the string starting
861at C<s> and looking no further than S<C<e - 1>> are from this UTF-8 extension;
862otherwise it evaluates to 0. If non-zero, the value gives how many bytes
863starting at C<s> comprise the code point's representation.
864
8650 is returned if the bytes are not well-formed extended UTF-8, or if they
866represent a code point that cannot fit in a UV on the current platform. Hence
867this macro can give different results when run on a 64-bit word machine than on
868one with a 32-bit word size.
0c58a72b 869
891fd405 870Note that it is illegal to have code points that are larger than what can
89d986df 871fit in an IV on the current machine.
7131f24d 872
89d986df
KW		 873=cut
874
875 * ASCII EBCDIC I8
7131f24d
KW		 876 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
877 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
878 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
89d986df
KW		 879 */
880#ifdef EBCDIC
a14e0a36 881# define UTF8_IS_SUPER(s, e) \
8974941d
KW		 882 (( ((e) > (s) + 4) \
883 && (NATIVE_UTF8_TO_I8(*(s)) >= 0xF9) \
884 && UNLIKELY( NATIVE_UTF8_TO_I8(*(s)) > 0xF9 \
885 || (NATIVE_UTF8_TO_I8(*((s) + 1)) >= 0xA2)) \
886 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
887 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0
7131f24d 888#else
a14e0a36 889# define UTF8_IS_SUPER(s, e) \
8974941d 890 (( ((e) > (s) + 3) \
89d986df 891 && (*(U8*) (s)) >= 0xF4 \
8974941d
KW		 892 && (UNLIKELY( ((*(U8*) (s)) > 0xF4) \
893 || (*((U8*) (s) + 1) >= 0x90))) \
89d986df 894 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
1376b35c 895 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
7131f24d
KW		 896#endif
897
b96a92fb
KW		 898/* These are now machine generated, and the 'given' clause is no longer
899 * applicable */
0c58a72b 900#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
89d986df
KW		 901 cBOOL(is_NONCHAR_utf8_safe(s,e))
902
903/*
904=for apidoc Am|bool|UTF8_IS_NONCHAR|const U8 *s|const U8 *e
905
906Evaluates to non-zero if the first few bytes of the string starting at C<s> and
907looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
908of the Unicode non-character code points; otherwise it evaluates to 0. If
909non-zero, the value gives how many bytes starting at C<s> comprise the code
910point's representation.
911
d296fe14
KW		 912=for apidoc AmnU|UV|UNICODE_REPLACEMENT
913
914Evaluates to 0xFFFD, the code point of the Unicode REPLACEMENT CHARACTER
915
89d986df
KW		 916=cut
917 */
0c58a72b
KW		 918#define UTF8_IS_NONCHAR(s, e) \
919 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 920
c867b360
JH		 921#define UNICODE_SURROGATE_FIRST 0xD800
922#define UNICODE_SURROGATE_LAST 0xDFFF
923#define UNICODE_REPLACEMENT 0xFFFD
924#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 925
b851fbc1 926/* Though our UTF-8 encoding can go beyond this,
c76687c5 927 * let's be conservative and do as Unicode says. */
b851fbc1
JH		 928#define PERL_UNICODE_MAX 0x10FFFF
929
d044b7a7
KW		 930#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
931#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
932#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
933#define UNICODE_WARN_PERL_EXTENDED 0x0008 /* Above 0x7FFF_FFFF */
934#define UNICODE_WARN_ABOVE_31_BIT UNICODE_WARN_PERL_EXTENDED
935#define UNICODE_DISALLOW_SURROGATE 0x0010
936#define UNICODE_DISALLOW_NONCHAR 0x0020
937#define UNICODE_DISALLOW_SUPER 0x0040
938#define UNICODE_DISALLOW_PERL_EXTENDED 0x0080
24b4c303
KW		 939
940#ifdef PERL_CORE
941# define UNICODE_ALLOW_ABOVE_IV_MAX 0x0100
942#endif
d044b7a7 943#define UNICODE_DISALLOW_ABOVE_31_BIT UNICODE_DISALLOW_PERL_EXTENDED
33f38593
KW		 944
945#define UNICODE_GOT_SURROGATE UNICODE_DISALLOW_SURROGATE
946#define UNICODE_GOT_NONCHAR UNICODE_DISALLOW_NONCHAR
947#define UNICODE_GOT_SUPER UNICODE_DISALLOW_SUPER
948#define UNICODE_GOT_PERL_EXTENDED UNICODE_DISALLOW_PERL_EXTENDED
949
ecc1615f
KW		 950#define UNICODE_WARN_ILLEGAL_C9_INTERCHANGE \
951 (UNICODE_WARN_SURROGATE|UNICODE_WARN_SUPER)
bb88be5f 952#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
ecc1615f
KW		 953 (UNICODE_WARN_ILLEGAL_C9_INTERCHANGE|UNICODE_WARN_NONCHAR)
954#define UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE \
955 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_SUPER)
bb88be5f 956#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 957 (UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE|UNICODE_DISALLOW_NONCHAR)
949cf498
KW		 958
959/* For backward source compatibility, as are now the default */
960#define UNICODE_ALLOW_SURROGATE 0
961#define UNICODE_ALLOW_SUPER 0
962#define UNICODE_ALLOW_ANY 0
b851fbc1 963
2d6b3d38
KW		 964/* This matches the 2048 code points between UNICODE_SURROGATE_FIRST (0xD800) and
965 * UNICODE_SURROGATE_LAST (0xDFFF) */
8974941d 966#define UNICODE_IS_SURROGATE(uv) UNLIKELY(((UV) (uv) & (~0xFFFF | 0xF800)) \
2d6b3d38
KW		 967 == 0xD800)
968
8974941d
KW		 969#define UNICODE_IS_REPLACEMENT(uv) UNLIKELY((UV) (uv) == UNICODE_REPLACEMENT)
970#define UNICODE_IS_BYTE_ORDER_MARK(uv) UNLIKELY((UV) (uv) \
971 == UNICODE_BYTE_ORDER_MARK)
c149ab20
KW		 972
973/* Is 'uv' one of the 32 contiguous-range noncharacters? */
8974941d
KW		 974#define UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) UNLIKELY((UV) (uv) >= 0xFDD0 \
975 && (UV) (uv) <= 0xFDEF)
c149ab20
KW		 976
977/* Is 'uv' one of the 34 plane-ending noncharacters 0xFFFE, 0xFFFF, 0x1FFFE,
978 * 0x1FFFF, ... 0x10FFFE, 0x10FFFF, given that we know that 'uv' is not above
979 * the Unicode legal max */
980#define UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv) \
8974941d 981 UNLIKELY(((UV) (uv) & 0xFFFE) == 0xFFFE)
c149ab20
KW		 982
983#define UNICODE_IS_NONCHAR(uv) \
984 ( UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) \
985 || ( LIKELY( ! UNICODE_IS_SUPER(uv)) \
986 && UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)))
987
8974941d 988#define UNICODE_IS_SUPER(uv) UNLIKELY((UV) (uv) > PERL_UNICODE_MAX)
1d72bdf6 989
ec34087a
KW		 990#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
991#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
992 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
993#define MICRO_SIGN MICRO_SIGN_NATIVE
994#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
995 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
996#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
997 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH		 998#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
999#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
1000#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 1001#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW		 1002#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
1003 of MICRON */
1004#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW		 1005#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
1006# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
1007#endif
74894415
KW		 1008#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
1009#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 1010#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW		 1011#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
1012#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW		 1013#define KELVIN_SIGN 0x212A
1014#define ANGSTROM_SIGN 0x212B
09091399 1015
9e55ce06 1016#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41 1017#define UNI_DISPLAY_BACKSLASH 0x0002
daf6caf1
KW		 1018#define UNI_DISPLAY_BACKSPACE 0x0004 /* Allow \b when also
1019 UNI_DISPLAY_BACKSLASH */
1020#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT \
1021 |UNI_DISPLAY_BACKSLASH \
1022 |UNI_DISPLAY_BACKSPACE)
1023
1024/* Character classes could also allow \b, but not patterns in general */
c728cb41 1025#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 1026
e0ffa6d6 1027/* Should be removed; maybe deprecated, but not used in CPAN */
ebc501f0 1028#define SHARP_S_SKIP 2
3b0fc154 1029
3cedd9d9 1030#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
976c1b08
KW		 1031#define bytes_from_utf8(s, lenp, is_utf8p) \
1032 bytes_from_utf8_loc(s, lenp, is_utf8p, 0)
3cedd9d9 1033
e23e8bc1
KW		 1034/*
1035
25e3a4e0
KW		 1036=for apidoc Am|STRLEN|isUTF8_CHAR_flags|const U8 *s|const U8 *e| const U32 flags
1037
1038Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1039looking no further than S<C<e - 1>> are well-formed UTF-8, as extended by Perl,
1040that represents some code point, subject to the restrictions given by C<flags>;
1041otherwise it evaluates to 0. If non-zero, the value gives how many bytes
2717076a
KW		 1042starting at C<s> comprise the code point's representation. Any bytes remaining
1043before C<e>, but beyond the ones needed to form the first code point in C<s>,
1044are not examined.
25e3a4e0
KW		 1045
1046If C<flags> is 0, this gives the same results as C<L</isUTF8_CHAR>>;
1047if C<flags> is C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, this gives the same results
1048as C<L</isSTRICT_UTF8_CHAR>>;
1049and if C<flags> is C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE>, this gives
1050the same results as C<L</isC9_STRICT_UTF8_CHAR>>.
1051Otherwise C<flags> may be any combination of the C<UTF8_DISALLOW_I<foo>> flags
1052understood by C<L</utf8n_to_uvchr>>, with the same meanings.
1053
1054The three alternative macros are for the most commonly needed validations; they
1055are likely to run somewhat faster than this more general one, as they can be
1056inlined into your code.
1057
9f2abfde
KW		 1058Use L</is_utf8_string_flags>, L</is_utf8_string_loc_flags>, and
1059L</is_utf8_string_loclen_flags> to check entire strings.
1060
25e3a4e0
KW		 1061=cut
1062*/
1063
1064#define isUTF8_CHAR_flags(s, e, flags) \
1065 (UNLIKELY((e) <= (s)) \
1066 ? 0 \
1067 : (UTF8_IS_INVARIANT(*s)) \
1068 ? 1 \
1069 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1070 ? 0 \
1376b35c 1071 : is_utf8_char_helper(s, e, flags))
25e3a4e0 1072
6302f837
KW		 1073/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
1074 * retained solely for backwards compatibility */
1075#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 1076
6a5bc5ac 1077#endif /* PERL_UTF8_H_ */
57f0e7e2 1078
e9a8c099 1079/*
14d04a33 1080 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 1081 */
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