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Fix UTF8_IS_START on EBCDIC
[perl5.git] / utf8.h
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1/* utf8.h
2 *
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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 *
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9 * Copyright (C) 2000, 2001, 2002, 2005, 2006, 2007, 2009,
10 * 2010, 2011 by Larry Wall and others
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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
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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
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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
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29#include "regcharclass.h"
30#include "unicode_constants.h"
31
051a06d4 32/* For to_utf8_fold_flags, q.v. */
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33#define FOLD_FLAGS_LOCALE 0x1
34#define FOLD_FLAGS_FULL 0x2
35#define FOLD_FLAGS_NOMIX_ASCII 0x4
051a06d4 36
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37/*
38=head1 Unicode Support
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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.
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45
46=for apidoc is_ascii_string
47
8871a094 48This is a misleadingly-named synonym for L</is_utf8_invariant_string>.
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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
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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.
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58
59=cut
60*/
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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
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64#define uvoffuni_to_utf8_flags(d,uv,flags) \
65 uvoffuni_to_utf8_flags_msgs(d, uv, flags, 0)
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66#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
67#define uvchr_to_utf8_flags(d,uv,flags) \
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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)
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73#define utf8n_to_uvchr(s, len, lenp, flags) \
74 utf8n_to_uvchr_error(s, len, lenp, flags, 0)
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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
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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)
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84#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
85#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
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86#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
87#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 88
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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
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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 */
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100START_EXTERN_C
101
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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 */
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115#define UTF8_MAXBYTES 13
116
a0ed51b3 117#ifdef DOINIT
6f06b55f 118EXTCONST unsigned char PL_utf8skip[] = {
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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 */
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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 */
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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
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140};
141#else
6f06b55f 142EXTCONST unsigned char PL_utf8skip[];
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143#endif
144
73c4f7a1 145END_EXTERN_C
7e2040f0 146
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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
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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)))
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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 */
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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
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204#define UNI_TO_NATIVE(ch) ((UV) ((ch) | 0))
205#define NATIVE_TO_UNI(ch) ((UV) ((ch) | 0))
d7578b48 206
877d9f0d 207/*
9041c2e3 208
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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
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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
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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
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240 */
241
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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
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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
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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
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254encoded character.
255
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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
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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
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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
274 * those to to quickly exclude the vast majority of code points it will
275 * encounter */
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276#define isUTF8_POSSIBLY_PROBLEMATIC(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
277 (U8) c >= 0xED)
fed423a5 278
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279#define UNICODE_IS_PERL_EXTENDED(uv) UNLIKELY((UV) (uv) > 0x7FFFFFFF)
280
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281#endif /* EBCDIC vs ASCII */
282
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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. */
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286#define UTF_CONTINUATION_MASK ((U8) ((1U << UTF_ACCUMULATION_SHIFT) - 1))
287
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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
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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
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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
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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
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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
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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) \
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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 :
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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
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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) \
7028aeba 356 (UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT)) ? 7 : UTF8_MAXBYTES)
1d68d6cd 357#else
72164d3a 358# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
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359#endif
360
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361/* The next two macros use the base macro defined above, and add in the tests
362 * at the low-end of the range, for just 1 byte, yielding complete macros,
363 * publicly accessible. */
364
365/* Input is a true Unicode (not-native) code point */
366#define OFFUNISKIP(uv) (OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
2084b489 367
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368/*
369
370=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
371returns the number of bytes required to represent the code point C<cp> when
372encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
373255; a Unicode code point otherwise.
374
375=cut
376 */
fdb6583d 377#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 378
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379#define UTF_MIN_START_BYTE \
380 ((UTF_CONTINUATION_MARK >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
381
382/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
59645eb1 383 * This excludes invariants (they are single-byte). It also excludes the
4bab39bc 384 * illegal overlong sequences that begin with C0 and C1 on ASCII platforms, and
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385 * C0-C4 I8 start bytes on EBCDIC ones. On EBCDIC E0 can't start a
386 * non-overlong sequence, so we define a base macro and for those platforms,
387 * extend it to also exclude E0 */
388#define UTF8_IS_START_base(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4bab39bc 389 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_START_BYTE))
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390#ifdef EBCDIC
391# define UTF8_IS_START(c) \
392 (UTF8_IS_START_base(c) && (c) != I8_TO_NATIVE_UTF8(0xE0))
393#else
394# define UTF8_IS_START(c) UTF8_IS_START_base(c)
395#endif
4bab39bc 396
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397#define UTF_MIN_ABOVE_LATIN1_BYTE \
398 ((0x100 >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
399
400/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
401 * represent a code point > 255? */
402#define UTF8_IS_ABOVE_LATIN1(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
403 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_ABOVE_LATIN1_BYTE))
404
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405/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
406 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
407 * be well-formed. */
408#define UTF8_IS_DOWNGRADEABLE_START(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
409 inRANGE(NATIVE_UTF8_TO_I8(c), \
410 UTF_MIN_START_BYTE, UTF_MIN_ABOVE_LATIN1_BYTE - 1))
411
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412/* The largest code point representable by two UTF-8 bytes on this platform.
413 * As explained in the comments for __COMMON_UNI_SKIP, 32 start bytes with
fed423a5 414 * UTF_ACCUMULATION_SHIFT bits of information each */
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415#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
416
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417/* The largest code point representable by two UTF-8 bytes on any platform that
418 * Perl runs on. This value is constrained by EBCDIC which has 5 bits per
419 * continuation byte */
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420#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * (1U << 5) - 1)
421
f2c50040
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422/*
423
424=for apidoc AmnU|STRLEN|UTF8_MAXBYTES_CASE
425
426The maximum number of UTF-8 bytes a single Unicode character can
427uppercase/lowercase/titlecase/fold into.
428
429=cut
430
431 * Unicode guarantees that the maximum expansion is UTF8_MAX_FOLD_CHAR_EXPAND
432 * characters, but any above-Unicode code point will fold to itself, so we only
433 * have to look at the expansion of the maximum Unicode code point. But this
434 * number may be less than the space occupied by a very large code point under
435 * Perl's extended UTF-8. We have to make it large enough to fit any single
436 * character. (It turns out that ASCII and EBCDIC differ in which is larger)
437 *
438=cut
439*/
c03c0950 440#define UTF8_MAXBYTES_CASE \
ae9a9edb 441 MAX(UTF8_MAXBYTES, UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF))
c03c0950 442
d06134e5
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443/* Rest of these are attributes of Unicode and perl's internals rather than the
444 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
445 * this level; the macros that some of these call may have different
446 * definitions in the two encodings */
447
59a449d5
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448/* In domain restricted to ASCII, these may make more sense to the reader than
449 * the ones with Latin1 in the name */
450#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
451#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
452
453/* More or less misleadingly-named defines, retained for back compat */
454#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
455#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
456#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
457#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
458#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 459
c0236afe 460/* This defines the 1-bits that are to be in the first byte of a multi-byte
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461 * UTF-8 encoded character that mark it as a start byte and give the number of
462 * bytes that comprise the character. 'len' is the number of bytes in the
463 * multi-byte sequence. */
b5ad20ca 464#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : ((U8) (0xFE << (7-(len)))))
c0236afe
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465
466/* Masks out the initial one bits in a start byte, leaving the real data ones.
467 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
468 * multi-byte sequence that comprises the character. */
469#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
470
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471/* Adds a UTF8 continuation byte 'new' of information to a running total code
472 * point 'old' of all the continuation bytes so far. This is designed to be
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473 * used in a loop to convert from UTF-8 to the code point represented. Note
474 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
475 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
476 * code point in process of being generated */
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477#define UTF8_ACCUMULATE(old, new) (__ASSERT_(FITS_IN_8_BITS(new)) \
478 ((old) << UTF_ACCUMULATION_SHIFT) \
009097b1 479 | ((NATIVE_UTF8_TO_I8(new)) \
155d2738 480 & UTF_CONTINUATION_MASK))
d06134e5 481
4ab10950 482/* This works in the face of malformed UTF-8. */
4e1ed312
KW
483#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) \
484 ( UTF8_IS_DOWNGRADEABLE_START(*(s)) \
485 && ( (e) - (s) > 1) \
486 && UTF8_IS_CONTINUATION(*((s)+1)))
4ab10950 487
5aaebcb3 488/* Number of bytes a code point occupies in UTF-8. */
5352a763 489#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 490
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491/* Most code which says UNISKIP is really thinking in terms of native code
492 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 493 * it means existing code continues to work. For precision, use UVCHR_SKIP,
5352a763
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494 * NATIVE_SKIP, or OFFUNISKIP */
495#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 496
3c0792e4
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497/* Longer, but more accurate name */
498#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
499
a62b247b
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500/* Convert a UTF-8 variant Latin1 character to a native code point value.
501 * Needs just one iteration of accumulate. Should be used only if it is known
502 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
503 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
504 * representable by two bytes (which turns out to be up through
505 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
506 * HI: a downgradable start byte;
507 * LO: continuation.
508 * */
509#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
510 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
511 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
512 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
513 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
514
94bb8c36 515/* Convert a two (not one) byte utf8 character to a native code point value.
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516 * Needs just one iteration of accumulate. Should not be used unless it is
517 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
518 * Note that the result can be larger than 255 if the input character is not
519 * downgradable */
94bb8c36 520#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
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521 (__ASSERT_(FITS_IN_8_BITS(HI)) \
522 __ASSERT_(FITS_IN_8_BITS(LO)) \
523 __ASSERT_(PL_utf8skip[HI] == 2) \
524 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 525 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 526 (LO))))
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527
528/* Should never be used, and be deprecated */
529#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 530
bd18bd40
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531/*
532
533=for apidoc Am|STRLEN|UTF8SKIP|char* s
ee0ff0f5
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534returns the number of bytes a non-malformed UTF-8 encoded character whose first
535(perhaps only) byte is pointed to by C<s>.
536
537If there is a possibility of malformed input, use instead:
538
539=over
540
541=item L</C<UTF8_SAFE_SKIP>> if you know the maximum ending pointer in the
542buffer pointed to by C<s>; or
543
544=item L</C<UTF8_CHK_SKIP>> if you don't know it.
545
546=back
547
548It is better to restructure your code so the end pointer is passed down so that
549you know what it actually is at the point of this call, but if that isn't
550possible, L</C<UTF8_CHK_SKIP>> can minimize the chance of accessing beyond the end
551of the input buffer.
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552
553=cut
554 */
2a70536e 555#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
a281f16c
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556
557/*
558=for apidoc Am|STRLEN|UTF8_SKIP|char* s
559This is a synonym for L</C<UTF8SKIP>>
560
561=cut
562*/
563
2a70536e 564#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 565
85fcc8f2 566/*
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567=for apidoc Am|STRLEN|UTF8_CHK_SKIP|char* s
568
569This is a safer version of L</C<UTF8SKIP>>, but still not as safe as
570L</C<UTF8_SAFE_SKIP>>. This version doesn't blindly assume that the input
571string pointed to by C<s> is well-formed, but verifies that there isn't a NUL
572terminating character before the expected end of the next character in C<s>.
573The length C<UTF8_CHK_SKIP> returns stops just before any such NUL.
574
575Perl tends to add NULs, as an insurance policy, after the end of strings in
576SV's, so it is likely that using this macro will prevent inadvertent reading
577beyond the end of the input buffer, even if it is malformed UTF-8.
578
579This macro is intended to be used by XS modules where the inputs could be
580malformed, and it isn't feasible to restructure to use the safer
581L</C<UTF8_SAFE_SKIP>>, for example when interfacing with a C library.
582
583=cut
584*/
585
586#define UTF8_CHK_SKIP(s) \
f87d8789
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587 (s[0] == '\0' ? 1 : MIN(UTF8SKIP(s), \
588 my_strnlen((char *) (s), UTF8SKIP(s))))
ee0ff0f5 589/*
85fcc8f2
KW
590
591=for apidoc Am|STRLEN|UTF8_SAFE_SKIP|char* s|char* e
45671da2
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592returns 0 if S<C<s E<gt>= e>>; otherwise returns the number of bytes in the
593UTF-8 encoded character whose first byte is pointed to by C<s>. But it never
594returns beyond C<e>. On DEBUGGING builds, it asserts that S<C<s E<lt>= e>>.
85fcc8f2
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595
596=cut
597 */
45671da2
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598#define UTF8_SAFE_SKIP(s, e) (__ASSERT_((e) >= (s)) \
599 ((e) - (s)) <= 0 \
600 ? 0 \
601 : MIN(((e) - (s)), UTF8_SKIP(s)))
85fcc8f2 602
2d1545e5
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603/* Most code that says 'UNI_' really means the native value for code points up
604 * through 255 */
605#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
606
c2b32798
KW
607/*
608=for apidoc Am|bool|UTF8_IS_INVARIANT|char c
609
610Evaluates to 1 if the byte C<c> represents the same character when encoded in
611UTF-8 as when not; otherwise evaluates to 0. UTF-8 invariant characters can be
612copied as-is when converting to/from UTF-8, saving time.
613
614In spite of the name, this macro gives the correct result if the input string
615from which C<c> comes is not encoded in UTF-8.
616
617See C<L</UVCHR_IS_INVARIANT>> for checking if a UV is invariant.
618
619=cut
620
621The reason it works on both UTF-8 encoded strings and non-UTF-8 encoded, is
622that it returns TRUE in each for the exact same set of bit patterns. It is
623valid on a subset of what UVCHR_IS_INVARIANT is valid on, so can just use that;
624and the compiler should optimize out anything extraneous given the
625implementation of the latter. The |0 makes sure this isn't mistakenly called
626with a ptr argument.
627*/
5c06326b 628#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT((c) | 0)
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629
630/* Like the above, but its name implies a non-UTF8 input, which as the comments
631 * above show, doesn't matter as to its implementation */
38953e5a 632#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 633
2c03e801
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634/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
635 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT. */
636#define UTF8_IS_CONTINUED(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
637 (! UTF8_IS_INVARIANT(c)))
638
48ccf5e1
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639/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
640 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
641 * it must be less than 0x3FF to work across both encodings. */
642
643/* These two are helper macros for the other three sets, and should not be used
644 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
1ff3baa2
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645 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
646 * for any code point */
48ccf5e1 647#define __BASE_TWO_BYTE_HI(c, translate_function) \
2863dafa 648 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 649 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
2863dafa 650 | UTF_START_MARK(2)))
48ccf5e1 651#define __BASE_TWO_BYTE_LO(c, translate_function) \
2863dafa 652 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 653 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
2863dafa 654 | UTF_CONTINUATION_MARK))
48ccf5e1 655
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656/* The next two macros should not be used. They were designed to be usable as
657 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 658 * regen/unicode_constants.pl instead */
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659#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
660#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
661
662/* The next two macros are used when the source should be a single byte
663 * character; checked for under DEBUGGING */
664#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 665 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 666#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 667 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
48ccf5e1
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668
669/* These final two macros in the series are used when the source can be any
670 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
671 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
672 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 673 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
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674 * places, so the ~ works */
675#define UTF8_TWO_BYTE_HI(c) \
676 (__ASSERT_((sizeof(c) == 1) \
d52b8576 677 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 678 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
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679#define UTF8_TWO_BYTE_LO(c) \
680 (__ASSERT_((sizeof(c) == 1) \
d52b8576 681 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 682 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 683
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684/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
685 * as it is only in overlongs. */
686#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
687
7e2040f0 688/*
e3036cf4 689 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
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690 * from an earlier version of these macros in which they didn't call the
691 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
692 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
693 * no need to do it again here
7e2040f0 694 */
da8c1a98
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695#define isIDFIRST_lazy_if_safe(p, e, UTF) \
696 ((IN_BYTES || !UTF) \
697 ? isIDFIRST(*(p)) \
698 : isIDFIRST_utf8_safe(p, e))
da8c1a98
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699#define isWORDCHAR_lazy_if_safe(p, e, UTF) \
700 ((IN_BYTES || !UTF) \
701 ? isWORDCHAR(*(p)) \
702 : isWORDCHAR_utf8_safe((U8 *) p, (U8 *) e))
4c1d9526 703#define isALNUM_lazy_if_safe(p, e, UTF) isWORDCHAR_lazy_if_safe(p, e, UTF)
da8c1a98 704
89ebb4a3
JH
705#define UTF8_MAXLEN UTF8_MAXBYTES
706
8cb75cc8
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707/* A Unicode character can fold to up to 3 characters */
708#define UTF8_MAX_FOLD_CHAR_EXPAND 3
709
d3481830 710#define IN_BYTES UNLIKELY(CopHINTS_get(PL_curcop) & HINT_BYTES)
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711
712/*
713
714=for apidoc Am|bool|DO_UTF8|SV* sv
715Returns a bool giving whether or not the PV in C<sv> is to be treated as being
716encoded in UTF-8.
717
718You should use this I<after> a call to C<SvPV()> or one of its variants, in
719case any call to string overloading updates the internal UTF-8 encoding flag.
720
721=cut
722*/
0064a8a9 723#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
1ff3baa2
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724
725/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
726 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
727 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
728 * could be */
70844984
KW
729#define IN_UNI_8_BIT \
730 (( ( (CopHINTS_get(PL_curcop) & HINT_UNI_8_BIT)) \
731 || ( CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
732 /* -1 below is for :not_characters */ \
733 && _is_in_locale_category(FALSE, -1))) \
734 && (! IN_BYTES))
b36bf33f 735
1d72bdf6 736
c76687c5 737#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
2b5e7bc2 738#define UTF8_GOT_EMPTY UTF8_ALLOW_EMPTY
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739
740/* Allow first byte to be a continuation byte */
1d72bdf6 741#define UTF8_ALLOW_CONTINUATION 0x0002
2b5e7bc2 742#define UTF8_GOT_CONTINUATION UTF8_ALLOW_CONTINUATION
c76687c5 743
cd01d3b1 744/* Unexpected non-continuation byte */
1d72bdf6 745#define UTF8_ALLOW_NON_CONTINUATION 0x0004
2b5e7bc2 746#define UTF8_GOT_NON_CONTINUATION UTF8_ALLOW_NON_CONTINUATION
949cf498
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747
748/* expecting more bytes than were available in the string */
749#define UTF8_ALLOW_SHORT 0x0008
2b5e7bc2 750#define UTF8_GOT_SHORT UTF8_ALLOW_SHORT
949cf498 751
94953955
KW
752/* Overlong sequence; i.e., the code point can be specified in fewer bytes.
753 * First one will convert the overlong to the REPLACEMENT CHARACTER; second
754 * will return what the overlong evaluates to */
949cf498 755#define UTF8_ALLOW_LONG 0x0010
94953955 756#define UTF8_ALLOW_LONG_AND_ITS_VALUE (UTF8_ALLOW_LONG|0x0020)
2b5e7bc2
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757#define UTF8_GOT_LONG UTF8_ALLOW_LONG
758
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759#define UTF8_ALLOW_OVERFLOW 0x0080
760#define UTF8_GOT_OVERFLOW UTF8_ALLOW_OVERFLOW
949cf498 761
f180b292 762#define UTF8_DISALLOW_SURROGATE 0x0100 /* Unicode surrogates */
2b5e7bc2 763#define UTF8_GOT_SURROGATE UTF8_DISALLOW_SURROGATE
f180b292 764#define UTF8_WARN_SURROGATE 0x0200
949cf498 765
c4e96019
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766/* Unicode non-character code points */
767#define UTF8_DISALLOW_NONCHAR 0x0400
2b5e7bc2 768#define UTF8_GOT_NONCHAR UTF8_DISALLOW_NONCHAR
c4e96019 769#define UTF8_WARN_NONCHAR 0x0800
949cf498 770
c4e96019
KW
771/* Super-set of Unicode: code points above the legal max */
772#define UTF8_DISALLOW_SUPER 0x1000
2b5e7bc2 773#define UTF8_GOT_SUPER UTF8_DISALLOW_SUPER
c4e96019
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774#define UTF8_WARN_SUPER 0x2000
775
776/* The original UTF-8 standard did not define UTF-8 with start bytes of 0xFE or
777 * 0xFF, though UTF-EBCDIC did. This allowed both versions to represent code
778 * points up to 2 ** 31 - 1. Perl extends UTF-8 so that 0xFE and 0xFF are
779 * usable on ASCII platforms, and 0xFF means something different than
780 * UTF-EBCDIC defines. These changes allow code points of 64 bits (actually
781 * somewhat more) to be represented on both platforms. But these are Perl
782 * extensions, and not likely to be interchangeable with other languages. Note
783 * that on ASCII platforms, FE overflows a signed 32-bit word, and FF an
784 * unsigned one. */
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785#define UTF8_DISALLOW_PERL_EXTENDED 0x4000
786#define UTF8_GOT_PERL_EXTENDED UTF8_DISALLOW_PERL_EXTENDED
787#define UTF8_WARN_PERL_EXTENDED 0x8000
d35f2ca5 788
57ff5f59
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789/* For back compat, these old names are misleading for overlongs and
790 * UTF_EBCDIC. */
d044b7a7
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791#define UTF8_DISALLOW_ABOVE_31_BIT UTF8_DISALLOW_PERL_EXTENDED
792#define UTF8_GOT_ABOVE_31_BIT UTF8_GOT_PERL_EXTENDED
793#define UTF8_WARN_ABOVE_31_BIT UTF8_WARN_PERL_EXTENDED
794#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_PERL_EXTENDED
795#define UTF8_WARN_FE_FF UTF8_WARN_PERL_EXTENDED
949cf498 796
f180b292 797#define UTF8_CHECK_ONLY 0x10000
99a765e9 798#define _UTF8_NO_CONFIDENCE_IN_CURLEN 0x20000 /* Internal core use only */
949cf498
KW
799
800/* For backwards source compatibility. They do nothing, as the default now
801 * includes what they used to mean. The first one's meaning was to allow the
802 * just the single non-character 0xFFFF */
803#define UTF8_ALLOW_FFFF 0
c825ef8c 804#define UTF8_ALLOW_FE_FF 0
949cf498
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805#define UTF8_ALLOW_SURROGATE 0
806
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807/* C9 refers to Unicode Corrigendum #9: allows but discourages non-chars */
808#define UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE \
809 (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_SURROGATE)
810#define UTF8_WARN_ILLEGAL_C9_INTERCHANGE (UTF8_WARN_SUPER|UTF8_WARN_SURROGATE)
811
d35f2ca5 812#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 813 (UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE|UTF8_DISALLOW_NONCHAR)
949cf498 814#define UTF8_WARN_ILLEGAL_INTERCHANGE \
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KW
815 (UTF8_WARN_ILLEGAL_C9_INTERCHANGE|UTF8_WARN_NONCHAR)
816
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817/* This is typically used for code that processes UTF-8 input and doesn't want
818 * to have to deal with any malformations that might be present. All such will
819 * be safely replaced by the REPLACEMENT CHARACTER, unless other flags
820 * overriding this are also present. */
2d532c27
KW
821#define UTF8_ALLOW_ANY ( UTF8_ALLOW_CONTINUATION \
822 |UTF8_ALLOW_NON_CONTINUATION \
823 |UTF8_ALLOW_SHORT \
d60baaa7
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824 |UTF8_ALLOW_LONG \
825 |UTF8_ALLOW_OVERFLOW)
2d532c27
KW
826
827/* Accept any Perl-extended UTF-8 that evaluates to any UV on the platform, but
cd01d3b1 828 * not any malformed. This is the default. */
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829#define UTF8_ALLOW_ANYUV 0
830#define UTF8_ALLOW_DEFAULT UTF8_ALLOW_ANYUV
1d72bdf6 831
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KW
832/*
833=for apidoc Am|bool|UTF8_IS_SURROGATE|const U8 *s|const U8 *e
834
835Evaluates to non-zero if the first few bytes of the string starting at C<s> and
836looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
837of the Unicode surrogate code points; otherwise it evaluates to 0. If
838non-zero, the value gives how many bytes starting at C<s> comprise the code
839point's representation.
840
841=cut
842 */
843#define UTF8_IS_SURROGATE(s, e) is_SURROGATE_utf8_safe(s, e)
844
845
846#define UTF8_IS_REPLACEMENT(s, send) is_REPLACEMENT_utf8_safe(s,send)
847
285aa1f0 848#define MAX_LEGAL_CP ((UV)IV_MAX)
40606899 849
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850/*
851=for apidoc Am|bool|UTF8_IS_SUPER|const U8 *s|const U8 *e
852
853Recall that Perl recognizes an extension to UTF-8 that can encode code
854points larger than the ones defined by Unicode, which are 0..0x10FFFF.
855
856This macro evaluates to non-zero if the first few bytes of the string starting
857at C<s> and looking no further than S<C<e - 1>> are from this UTF-8 extension;
858otherwise it evaluates to 0. If non-zero, the value gives how many bytes
859starting at C<s> comprise the code point's representation.
860
8610 is returned if the bytes are not well-formed extended UTF-8, or if they
862represent a code point that cannot fit in a UV on the current platform. Hence
863this macro can give different results when run on a 64-bit word machine than on
864one with a 32-bit word size.
0c58a72b 865
891fd405 866Note that it is illegal to have code points that are larger than what can
89d986df 867fit in an IV on the current machine.
7131f24d 868
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KW
869=cut
870
871 * ASCII EBCDIC I8
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872 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
873 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
874 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
89d986df
KW
875 */
876#ifdef EBCDIC
a14e0a36 877# define UTF8_IS_SUPER(s, e) \
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KW
878 (( LIKELY((e) > (s) + 4) \
879 && NATIVE_UTF8_TO_I8(*(s)) >= 0xF9 \
880 && ( NATIVE_UTF8_TO_I8(*(s)) > 0xF9 \
3d42f267 881 || (NATIVE_UTF8_TO_I8(*((s) + 1)) >= 0xA2)) \
89d986df 882 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
1376b35c 883 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
7131f24d 884#else
a14e0a36 885# define UTF8_IS_SUPER(s, e) \
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886 (( LIKELY((e) > (s) + 3) \
887 && (*(U8*) (s)) >= 0xF4 \
888 && ((*(U8*) (s)) > 0xF4 || (*((U8*) (s) + 1) >= 0x90))\
889 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
1376b35c 890 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
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KW
891#endif
892
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893/* These are now machine generated, and the 'given' clause is no longer
894 * applicable */
0c58a72b 895#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
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896 cBOOL(is_NONCHAR_utf8_safe(s,e))
897
898/*
899=for apidoc Am|bool|UTF8_IS_NONCHAR|const U8 *s|const U8 *e
900
901Evaluates to non-zero if the first few bytes of the string starting at C<s> and
902looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
903of the Unicode non-character code points; otherwise it evaluates to 0. If
904non-zero, the value gives how many bytes starting at C<s> comprise the code
905point's representation.
906
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907=for apidoc AmnU|UV|UNICODE_REPLACEMENT
908
909Evaluates to 0xFFFD, the code point of the Unicode REPLACEMENT CHARACTER
910
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KW
911=cut
912 */
0c58a72b
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913#define UTF8_IS_NONCHAR(s, e) \
914 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 915
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JH
916#define UNICODE_SURROGATE_FIRST 0xD800
917#define UNICODE_SURROGATE_LAST 0xDFFF
918#define UNICODE_REPLACEMENT 0xFFFD
919#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 920
b851fbc1 921/* Though our UTF-8 encoding can go beyond this,
c76687c5 922 * let's be conservative and do as Unicode says. */
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JH
923#define PERL_UNICODE_MAX 0x10FFFF
924
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KW
925#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
926#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
927#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
928#define UNICODE_WARN_PERL_EXTENDED 0x0008 /* Above 0x7FFF_FFFF */
929#define UNICODE_WARN_ABOVE_31_BIT UNICODE_WARN_PERL_EXTENDED
930#define UNICODE_DISALLOW_SURROGATE 0x0010
931#define UNICODE_DISALLOW_NONCHAR 0x0020
932#define UNICODE_DISALLOW_SUPER 0x0040
933#define UNICODE_DISALLOW_PERL_EXTENDED 0x0080
24b4c303
KW
934
935#ifdef PERL_CORE
936# define UNICODE_ALLOW_ABOVE_IV_MAX 0x0100
937#endif
d044b7a7 938#define UNICODE_DISALLOW_ABOVE_31_BIT UNICODE_DISALLOW_PERL_EXTENDED
33f38593
KW
939
940#define UNICODE_GOT_SURROGATE UNICODE_DISALLOW_SURROGATE
941#define UNICODE_GOT_NONCHAR UNICODE_DISALLOW_NONCHAR
942#define UNICODE_GOT_SUPER UNICODE_DISALLOW_SUPER
943#define UNICODE_GOT_PERL_EXTENDED UNICODE_DISALLOW_PERL_EXTENDED
944
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KW
945#define UNICODE_WARN_ILLEGAL_C9_INTERCHANGE \
946 (UNICODE_WARN_SURROGATE|UNICODE_WARN_SUPER)
bb88be5f 947#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
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KW
948 (UNICODE_WARN_ILLEGAL_C9_INTERCHANGE|UNICODE_WARN_NONCHAR)
949#define UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE \
950 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_SUPER)
bb88be5f 951#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 952 (UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE|UNICODE_DISALLOW_NONCHAR)
949cf498
KW
953
954/* For backward source compatibility, as are now the default */
955#define UNICODE_ALLOW_SURROGATE 0
956#define UNICODE_ALLOW_SUPER 0
957#define UNICODE_ALLOW_ANY 0
b851fbc1 958
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KW
959/* This matches the 2048 code points between UNICODE_SURROGATE_FIRST (0xD800) and
960 * UNICODE_SURROGATE_LAST (0xDFFF) */
961#define UNICODE_IS_SURROGATE(uv) (((UV) (uv) & (~0xFFFF | 0xF800)) \
962 == 0xD800)
963
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KW
964#define UNICODE_IS_REPLACEMENT(uv) ((UV) (uv) == UNICODE_REPLACEMENT)
965#define UNICODE_IS_BYTE_ORDER_MARK(uv) ((UV) (uv) == UNICODE_BYTE_ORDER_MARK)
c149ab20
KW
966
967/* Is 'uv' one of the 32 contiguous-range noncharacters? */
968#define UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) ((UV) (uv) >= 0xFDD0 \
969 && (UV) (uv) <= 0xFDEF)
970
971/* Is 'uv' one of the 34 plane-ending noncharacters 0xFFFE, 0xFFFF, 0x1FFFE,
972 * 0x1FFFF, ... 0x10FFFE, 0x10FFFF, given that we know that 'uv' is not above
973 * the Unicode legal max */
974#define UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv) \
975 (((UV) (uv) & 0xFFFE) == 0xFFFE)
976
977#define UNICODE_IS_NONCHAR(uv) \
978 ( UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) \
979 || ( LIKELY( ! UNICODE_IS_SUPER(uv)) \
980 && UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)))
981
982#define UNICODE_IS_SUPER(uv) ((UV) (uv) > PERL_UNICODE_MAX)
1d72bdf6 983
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KW
984#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
985#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
986 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
987#define MICRO_SIGN MICRO_SIGN_NATIVE
988#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
989 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
990#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
991 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
992#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
993#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
994#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 995#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
996#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
997 of MICRON */
998#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
999#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
1000# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
1001#endif
74894415
KW
1002#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
1003#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 1004#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
1005#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
1006#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
1007#define KELVIN_SIGN 0x212A
1008#define ANGSTROM_SIGN 0x212B
09091399 1009
9e55ce06 1010#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
1011#define UNI_DISPLAY_BACKSLASH 0x0002
1012#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
1013#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 1014
5cd46e1f
KW
1015#define ANYOF_FOLD_SHARP_S(node, input, end) \
1016 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 1017 (ANYOF_NONBITMAP(node)) && \
39065660 1018 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 1019 ((end) > (input) + 1) && \
305b8651 1020 isALPHA_FOLD_EQ((input)[0], 's'))
6302f837 1021
ebc501f0 1022#define SHARP_S_SKIP 2
3b0fc154 1023
3cedd9d9 1024#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
976c1b08
KW
1025#define bytes_from_utf8(s, lenp, is_utf8p) \
1026 bytes_from_utf8_loc(s, lenp, is_utf8p, 0)
3cedd9d9 1027
e23e8bc1
KW
1028/*
1029
25e3a4e0
KW
1030=for apidoc Am|STRLEN|isUTF8_CHAR_flags|const U8 *s|const U8 *e| const U32 flags
1031
1032Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1033looking no further than S<C<e - 1>> are well-formed UTF-8, as extended by Perl,
1034that represents some code point, subject to the restrictions given by C<flags>;
1035otherwise it evaluates to 0. If non-zero, the value gives how many bytes
2717076a
KW
1036starting at C<s> comprise the code point's representation. Any bytes remaining
1037before C<e>, but beyond the ones needed to form the first code point in C<s>,
1038are not examined.
25e3a4e0
KW
1039
1040If C<flags> is 0, this gives the same results as C<L</isUTF8_CHAR>>;
1041if C<flags> is C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, this gives the same results
1042as C<L</isSTRICT_UTF8_CHAR>>;
1043and if C<flags> is C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE>, this gives
1044the same results as C<L</isC9_STRICT_UTF8_CHAR>>.
1045Otherwise C<flags> may be any combination of the C<UTF8_DISALLOW_I<foo>> flags
1046understood by C<L</utf8n_to_uvchr>>, with the same meanings.
1047
1048The three alternative macros are for the most commonly needed validations; they
1049are likely to run somewhat faster than this more general one, as they can be
1050inlined into your code.
1051
9f2abfde
KW
1052Use L</is_utf8_string_flags>, L</is_utf8_string_loc_flags>, and
1053L</is_utf8_string_loclen_flags> to check entire strings.
1054
25e3a4e0
KW
1055=cut
1056*/
1057
1058#define isUTF8_CHAR_flags(s, e, flags) \
1059 (UNLIKELY((e) <= (s)) \
1060 ? 0 \
1061 : (UTF8_IS_INVARIANT(*s)) \
1062 ? 1 \
1063 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1064 ? 0 \
1376b35c 1065 : is_utf8_char_helper(s, e, flags))
25e3a4e0 1066
6302f837
KW
1067/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
1068 * retained solely for backwards compatibility */
1069#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 1070
6a5bc5ac 1071#endif /* PERL_UTF8_H_ */
57f0e7e2 1072
e9a8c099 1073/*
14d04a33 1074 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 1075 */