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hexfp: test longdblkind directly, instead of doublekind
[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 H_UTF8 /* Guard against recursive inclusion */
18#define H_UTF8 1
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/* For _core_swash_init(), internal core use only */
38#define _CORE_SWASH_INIT_USER_DEFINED_PROPERTY 0x1
5d3d13d1 39#define _CORE_SWASH_INIT_RETURN_IF_UNDEF 0x2
87367d5f 40#define _CORE_SWASH_INIT_ACCEPT_INVLIST 0x4
83199d38 41
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42/*
43=head1 Unicode Support
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44L<perlguts/Unicode Support> has an introduction to this API.
45
46See also L</Character classification>,
47and L</Character case changing>.
48Various functions outside this section also work specially with Unicode.
49Search for the string "utf8" in this document.
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50
51=for apidoc is_ascii_string
52
53This is a misleadingly-named synonym for L</is_invariant_string>.
54On ASCII-ish platforms, the name isn't misleading: the ASCII-range characters
55are exactly the UTF-8 invariants. But EBCDIC machines have more invariants
56than just the ASCII characters, so C<is_invariant_string> is preferred.
57
58=cut
59*/
60#define is_ascii_string(s, len) is_invariant_string(s, len)
61
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62#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
63#define uvchr_to_utf8_flags(d,uv,flags) \
64 uvoffuni_to_utf8_flags(d,NATIVE_TO_UNI(uv),flags)
65#define utf8_to_uvchr_buf(s, e, lenp) \
842991ae 66 utf8n_to_uvchr(s, (U8*)(e) - (U8*)(s), lenp, \
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67 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY)
68
a0270393 69#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
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70#define to_utf8_fold(c, p, lenp) _to_utf8_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
71#define to_utf8_lower(a,b,c) _to_utf8_lower_flags(a,b,c,0)
72#define to_utf8_upper(a,b,c) _to_utf8_upper_flags(a,b,c,0)
73#define to_utf8_title(a,b,c) _to_utf8_title_flags(a,b,c,0)
36bb2ab6 74
fd7cb289 75/* Source backward compatibility. */
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76#define is_utf8_string_loc(s, len, ep) is_utf8_string_loclen(s, len, ep, 0)
77
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78#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
79 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 80#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 81#define FOLDEQ_LOCALE (1 << 1)
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82#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
83#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
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84#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
85#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 86
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87#define ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
88 cBOOL(! foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2))
89
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90#ifdef EBCDIC
91/* The equivalent of these macros but implementing UTF-EBCDIC
92 are in the following header file:
93 */
94
95#include "utfebcdic.h"
fd7cb289 96
d06134e5 97#else /* ! EBCDIC */
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98START_EXTERN_C
99
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100/* How wide can a single UTF-8 encoded character become in bytes. */
101/* NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
102 * is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
103 * expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
104 * non-negative integers in a binary format, even those above Unicode */
105#define UTF8_MAXBYTES 13
106
a0ed51b3 107#ifdef DOINIT
6f06b55f 108EXTCONST unsigned char PL_utf8skip[] = {
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109/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
110/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
111/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
112/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
113/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
114/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
115/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
116/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
117/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
118/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
119/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
120/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
121/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 122/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
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123/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
124/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
125/* 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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126 /* Perl extended (never was official UTF-8). Up to 36 bit */
127/* 0xFE */ 7,
128 /* More extended, Up to 72 bits (64-bit + reserved) */
111e8ed9 129/* 0xFF */ UTF8_MAXBYTES
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130};
131#else
6f06b55f 132EXTCONST unsigned char PL_utf8skip[];
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133#endif
134
73c4f7a1 135END_EXTERN_C
7e2040f0 136
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137/* Native character to/from iso-8859-1. Are the identity functions on ASCII
138 * platforms */
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139#define NATIVE_TO_LATIN1(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
140#define LATIN1_TO_NATIVE(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
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141
142/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
143 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
144 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
145 * because they are 8-bit encodings that serve the same purpose in Perl, and
146 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
147 * whichever one is applicable on the current platform */
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148#define NATIVE_UTF8_TO_I8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
149#define I8_TO_NATIVE_UTF8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
59a449d5 150
1d72bdf6 151/* Transforms in wide UV chars */
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152#define UNI_TO_NATIVE(ch) ((UV) (ch))
153#define NATIVE_TO_UNI(ch) ((UV) (ch))
d7578b48 154
877d9f0d 155/*
9041c2e3 156
8c007b5a 157 The following table is from Unicode 3.2.
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158
159 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
160
375122d7 161 U+0000..U+007F 00..7F
e1b711da 162 U+0080..U+07FF * C2..DF 80..BF
37e2e78e 163 U+0800..U+0FFF E0 * A0..BF 80..BF
375122d7 164 U+1000..U+CFFF E1..EC 80..BF 80..BF
e1b711da 165 U+D000..U+D7FF ED 80..9F 80..BF
537124e4 166 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
375122d7 167 U+E000..U+FFFF EE..EF 80..BF 80..BF
37e2e78e 168 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
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169 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
170 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
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171 Below are non-Unicode code points
172 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
173 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
537124e4 174 U+200000..: F8.. * 88..BF 80..BF 80..BF 80..BF
877d9f0d 175
e1b711da 176Note the gaps before several of the byte entries above marked by '*'. These are
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177caused by legal UTF-8 avoiding non-shortest encodings: it is technically
178possible to UTF-8-encode a single code point in different ways, but that is
179explicitly forbidden, and the shortest possible encoding should always be used
15824458 180(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 181
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182 */
183
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184/*
185 Another way to look at it, as bits:
186
b2635aa8 187 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 188
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189 0aaa aaaa 0aaa aaaa
190 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
191 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
192 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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193
194As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 195leading bits of the start byte tell how many bytes there are in the
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196encoded character.
197
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198Perl's extended UTF-8 means we can have start bytes up to FF.
199
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200*/
201
6c88483e 202/* Is the representation of the Unicode code point 'cp' the same regardless of
15824458 203 * being encoded in UTF-8 or not? */
2d1545e5 204#define OFFUNI_IS_INVARIANT(cp) isASCII(cp)
15824458 205
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206/* Is the representation of the code point 'cp' the same regardless of
207 * being encoded in UTF-8 or not? 'cp' is native if < 256; Unicode otherwise
208 * */
cf1be84e 209#define UVCHR_IS_INVARIANT(cp) OFFUNI_IS_INVARIANT(cp)
38953e5a 210
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211/* This defines the bits that are to be in the continuation bytes of a multi-byte
212 * UTF-8 encoded character that mark it is a continuation byte. */
213#define UTF_CONTINUATION_MARK 0x80
214
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215/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
216 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT */
c9264833 217#define UTF8_IS_CONTINUED(c) (((U8)c) & UTF_CONTINUATION_MARK)
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218
219/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
220 * This doesn't catch invariants (they are single-byte). It also excludes the
221 * illegal overlong sequences that begin with C0 and C1. */
e4f4ef45 222#define UTF8_IS_START(c) (((U8)c) >= 0xc2)
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223
224/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
225 * first byte thereof? */
c9264833 226#define UTF8_IS_CONTINUATION(c) ((((U8)c) & 0xC0) == UTF_CONTINUATION_MARK)
0ae1fa71 227
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228/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
229 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
230 * be well-formed. Masking with 0xfe allows the low bit to be 0 or 1; thus
231 * this matches 0xc[23]. */
559c7f10 232#define UTF8_IS_DOWNGRADEABLE_START(c) (((U8)(c) & 0xfe) == 0xc2)
4ab10950 233
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234/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
235 * represent a code point > 255? */
e4f4ef45 236#define UTF8_IS_ABOVE_LATIN1(c) ((U8)(c) >= 0xc4)
8850bf83 237
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238/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
239 * sequence contributes to the specification of the code point. In the bit
240 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
241 * real information */
1d72bdf6 242#define UTF_ACCUMULATION_SHIFT 6
b2635aa8 243
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244#if UVSIZE >= 8
245# define UTF8_QUAD_MAX UINT64_C(0x1000000000)
72164d3a 246#endif
6588300d 247
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248/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
249 * for more */
250#define QUESTION_MARK_CTRL DEL_NATIVE
251
252/* Surrogates, non-character code points and above-Unicode code points are
253 * problematic in some contexts. This allows code that needs to check for
254 * those to to quickly exclude the vast majority of code points it will
255 * encounter */
256#define isUTF8_POSSIBLY_PROBLEMATIC(c) ((U8) c >= 0xED)
257
258#endif /* EBCDIC vs ASCII */
259
260/* 2**UTF_ACCUMULATION_SHIFT - 1 */
261#define UTF_CONTINUATION_MASK ((U8) ((1U << UTF_ACCUMULATION_SHIFT) - 1))
262
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263/* Internal macro to be used only in this file to aid in constructing other
264 * publicly accessible macros.
265 * The number of bytes required to express this uv in UTF-8, for just those
266 * uv's requiring 2 through 6 bytes, as these are common to all platforms and
267 * word sizes. The number of bytes needed is given by the number of leading 1
268 * bits in the start byte. There are 32 start bytes that have 2 initial 1 bits
269 * (C0-DF); there are 16 that have 3 initial 1 bits (E0-EF); 8 that have 4
270 * initial 1 bits (F0-F8); 4 that have 5 initial 1 bits (F9-FB), and 2 that
271 * have 6 initial 1 bits (FC-FD). The largest number a string of n bytes can
272 * represent is (the number of possible start bytes for 'n')
273 * * (the number of possiblities for each start byte
274 * The latter in turn is
275 * 2 ** ( (how many continuation bytes there are)
276 * * (the number of bits of information each
277 * continuation byte holds))
278 *
279 * If we were on a platform where we could use a fast find first set bit
280 * instruction (or count leading zeros instruction) this could be replaced by
281 * using that to find the log2 of the uv, and divide that by the number of bits
282 * of information in each continuation byte, adjusting for large cases and how
283 * much information is in a start byte for that length */
72164d3a 284#define __COMMON_UNI_SKIP(uv) \
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285 (UV) (uv) < (32 * (1U << ( UTF_ACCUMULATION_SHIFT))) ? 2 : \
286 (UV) (uv) < (16 * (1U << (2 * UTF_ACCUMULATION_SHIFT))) ? 3 : \
287 (UV) (uv) < ( 8 * (1U << (3 * UTF_ACCUMULATION_SHIFT))) ? 4 : \
288 (UV) (uv) < ( 4 * (1U << (4 * UTF_ACCUMULATION_SHIFT))) ? 5 : \
289 (UV) (uv) < ( 2 * (1U << (5 * UTF_ACCUMULATION_SHIFT))) ? 6 :
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290
291/* Internal macro to be used only in this file.
292 * This adds to __COMMON_UNI_SKIP the details at this platform's upper range.
fed423a5 293 * For any-sized EBCDIC platforms, or 64-bit ASCII ones, we need one more test
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294 * to see if just 7 bytes is needed, or if the maximum is needed. For 32-bit
295 * ASCII platforms, everything is representable by 7 bytes */
fed423a5 296#if defined(UV_IS_QUAD) || defined(EBCDIC)
72164d3a 297# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) \
7028aeba 298 (UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT)) ? 7 : UTF8_MAXBYTES)
1d68d6cd 299#else
72164d3a 300# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
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301#endif
302
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303/* The next two macros use the base macro defined above, and add in the tests
304 * at the low-end of the range, for just 1 byte, yielding complete macros,
305 * publicly accessible. */
306
307/* Input is a true Unicode (not-native) code point */
308#define OFFUNISKIP(uv) (OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
2084b489 309
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310/*
311
312=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
313returns the number of bytes required to represent the code point C<cp> when
314encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
315255; a Unicode code point otherwise.
316
317=cut
318 */
fdb6583d 319#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 320
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321/* As explained in the comments for __COMMON_UNI_SKIP, 32 start bytes with
322 * UTF_ACCUMULATION_SHIFT bits of information each */
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323#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
324
325/* constrained by EBCDIC which has 5 bits per continuation byte */
326#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * (1U << 5) - 1)
327
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328/* The maximum number of UTF-8 bytes a single Unicode character can
329 * uppercase/lowercase/fold into. Unicode guarantees that the maximum
330 * expansion is UTF8_MAX_FOLD_CHAR_EXPAND characters, but any above-Unicode
331 * code point will fold to itself, so we only have to look at the expansion of
332 * the maximum Unicode code point. But this number may be less than the space
333 * occupied by a very large code point under Perl's extended UTF-8. We have to
334 * make it large enough to fit any single character. (It turns out that ASCII
335 * and EBCDIC differ in which is larger) */
336#define UTF8_MAXBYTES_CASE \
337 (UTF8_MAXBYTES >= (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)) \
338 ? UTF8_MAXBYTES \
339 : (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)))
340
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341/* Rest of these are attributes of Unicode and perl's internals rather than the
342 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
343 * this level; the macros that some of these call may have different
344 * definitions in the two encodings */
345
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346/* In domain restricted to ASCII, these may make more sense to the reader than
347 * the ones with Latin1 in the name */
348#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
349#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
350
351/* More or less misleadingly-named defines, retained for back compat */
352#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
353#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
354#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
355#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
356#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 357
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358/* This defines the 1-bits that are to be in the first byte of a multi-byte
359 * UTF-8 encoded character that give the number of bytes that comprise the
360 * character. 'len' is the number of bytes in the multi-byte sequence. */
361#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : (0xFF & (0xFE << (7-(len)))))
362
363/* Masks out the initial one bits in a start byte, leaving the real data ones.
364 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
365 * multi-byte sequence that comprises the character. */
366#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
367
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368/* Adds a UTF8 continuation byte 'new' of information to a running total code
369 * point 'old' of all the continuation bytes so far. This is designed to be
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370 * used in a loop to convert from UTF-8 to the code point represented. Note
371 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
372 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
373 * code point in process of being generated */
374#define UTF8_ACCUMULATE(old, new) (((old) << UTF_ACCUMULATION_SHIFT) \
375 | ((NATIVE_UTF8_TO_I8((U8)new)) \
376 & UTF_CONTINUATION_MASK))
d06134e5 377
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378/* If a value is anded with this, and the result is non-zero, then using the
379 * original value in UTF8_ACCUMULATE will overflow, shifting bits off the left
380 * */
381#define UTF_ACCUMULATION_OVERFLOW_MASK \
382 (((UV) UTF_CONTINUATION_MASK) << ((sizeof(UV) * CHARBITS) \
383 - UTF_ACCUMULATION_SHIFT))
384
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385/* This works in the face of malformed UTF-8. */
386#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) (UTF8_IS_DOWNGRADEABLE_START(*s) \
387 && ( (e) - (s) > 1) \
388 && UTF8_IS_CONTINUATION(*((s)+1)))
389
5aaebcb3 390/* Number of bytes a code point occupies in UTF-8. */
5352a763 391#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 392
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393/* Most code which says UNISKIP is really thinking in terms of native code
394 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 395 * it means existing code continues to work. For precision, use UVCHR_SKIP,
5352a763
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396 * NATIVE_SKIP, or OFFUNISKIP */
397#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 398
3c0792e4
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399/* Longer, but more accurate name */
400#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
401
a62b247b
KW
402/* Convert a UTF-8 variant Latin1 character to a native code point value.
403 * Needs just one iteration of accumulate. Should be used only if it is known
404 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
405 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
406 * representable by two bytes (which turns out to be up through
407 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
408 * HI: a downgradable start byte;
409 * LO: continuation.
410 * */
411#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
412 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
413 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
414 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
415 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
416
94bb8c36 417/* Convert a two (not one) byte utf8 character to a native code point value.
2950f2a7
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418 * Needs just one iteration of accumulate. Should not be used unless it is
419 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
420 * Note that the result can be larger than 255 if the input character is not
421 * downgradable */
94bb8c36 422#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
635e76f5
KW
423 ( __ASSERT_(UTF8SKIP(HI) == 2) \
424 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 425 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 426 (LO))))
94bb8c36
KW
427
428/* Should never be used, and be deprecated */
429#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 430
bd18bd40
KW
431/*
432
433=for apidoc Am|STRLEN|UTF8SKIP|char* s
434returns the number of bytes in the UTF-8 encoded character whose first (perhaps
435only) byte is pointed to by C<s>.
436
437=cut
438 */
2a70536e
KW
439#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
440#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 441
2d1545e5
KW
442/* Most code that says 'UNI_' really means the native value for code points up
443 * through 255 */
444#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
445
15824458
KW
446/* Is the byte 'c' the same character when encoded in UTF-8 as when not. This
447 * works on both UTF-8 encoded strings and non-encoded, as it returns TRUE in
5fc230f1
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448 * each for the exact same set of bit patterns. It is valid on a subset of
449 * what UVCHR_IS_INVARIANT is valid on, so can just use that; and the compiler
450 * should optimize out anything extraneous given the implementation of the
451 * latter */
452#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
453
454/* Like the above, but its name implies a non-UTF8 input, which as the comments
455 * above show, doesn't matter as to its implementation */
38953e5a 456#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 457
48ccf5e1
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458/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
459 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
460 * it must be less than 0x3FF to work across both encodings. */
461
462/* These two are helper macros for the other three sets, and should not be used
463 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
1ff3baa2
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464 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
465 * for any code point */
48ccf5e1
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466#define __BASE_TWO_BYTE_HI(c, translate_function) \
467 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
468 | UTF_START_MARK(2))
469#define __BASE_TWO_BYTE_LO(c, translate_function) \
470 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
471 | UTF_CONTINUATION_MARK)
472
48ccf5e1
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473/* The next two macros should not be used. They were designed to be usable as
474 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 475 * regen/unicode_constants.pl instead */
48ccf5e1
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476#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
477#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
478
479/* The next two macros are used when the source should be a single byte
480 * character; checked for under DEBUGGING */
481#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 482 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 483#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 484 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
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485
486/* These final two macros in the series are used when the source can be any
487 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
488 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
489 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 490 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
48ccf5e1
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491 * places, so the ~ works */
492#define UTF8_TWO_BYTE_HI(c) \
493 (__ASSERT_((sizeof(c) == 1) \
d52b8576 494 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 495 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
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496#define UTF8_TWO_BYTE_LO(c) \
497 (__ASSERT_((sizeof(c) == 1) \
d52b8576 498 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 499 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 500
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501/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
502 * as it is only in overlongs. */
503#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
504
7e2040f0 505/*
e3036cf4 506 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
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507 * from an earlier version of these macros in which they didn't call the
508 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
509 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
510 * no need to do it again here
7e2040f0 511 */
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512#define isIDFIRST_lazy_if(p,UTF) ((IN_BYTES || !UTF ) \
513 ? isIDFIRST(*(p)) \
514 : isIDFIRST_utf8((const U8*)p))
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515#define isWORDCHAR_lazy_if(p,UTF) ((IN_BYTES || (!UTF )) \
516 ? isWORDCHAR(*(p)) \
517 : isWORDCHAR_utf8((const U8*)p))
518#define isALNUM_lazy_if(p,UTF) isWORDCHAR_lazy_if(p,UTF)
1d72bdf6 519
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520#define UTF8_MAXLEN UTF8_MAXBYTES
521
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522/* A Unicode character can fold to up to 3 characters */
523#define UTF8_MAX_FOLD_CHAR_EXPAND 3
524
a98fe34d 525#define IN_BYTES (CopHINTS_get(PL_curcop) & HINT_BYTES)
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526
527/*
528
529=for apidoc Am|bool|DO_UTF8|SV* sv
530Returns a bool giving whether or not the PV in C<sv> is to be treated as being
531encoded in UTF-8.
532
533You should use this I<after> a call to C<SvPV()> or one of its variants, in
534case any call to string overloading updates the internal UTF-8 encoding flag.
535
536=cut
537*/
0064a8a9 538#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
1ff3baa2
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539
540/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
541 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
542 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
543 * could be */
544#define IN_UNI_8_BIT \
d6ded950
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545 (((CopHINTS_get(PL_curcop) & (HINT_UNI_8_BIT)) \
546 || (CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
547 /* -1 below is for :not_characters */ \
548 && _is_in_locale_category(FALSE, -1))) \
549 && ! IN_BYTES)
b36bf33f 550
1d72bdf6 551
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552#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
553
554/* Allow first byte to be a continuation byte */
1d72bdf6 555#define UTF8_ALLOW_CONTINUATION 0x0002
c76687c5
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556
557/* Allow second... bytes to be non-continuation bytes */
1d72bdf6 558#define UTF8_ALLOW_NON_CONTINUATION 0x0004
949cf498
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559
560/* expecting more bytes than were available in the string */
561#define UTF8_ALLOW_SHORT 0x0008
562
563/* Overlong sequence; i.e., the code point can be specified in fewer bytes. */
564#define UTF8_ALLOW_LONG 0x0010
565
566#define UTF8_DISALLOW_SURROGATE 0x0020 /* Unicode surrogates */
567#define UTF8_WARN_SURROGATE 0x0040
568
569#define UTF8_DISALLOW_NONCHAR 0x0080 /* Unicode non-character */
570#define UTF8_WARN_NONCHAR 0x0100 /* code points */
571
572#define UTF8_DISALLOW_SUPER 0x0200 /* Super-set of Unicode: code */
573#define UTF8_WARN_SUPER 0x0400 /* points above the legal max */
574
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575/* Code points which never were part of the original UTF-8 standard, which only
576 * went up to 2 ** 31 - 1. Note that these all overflow a signed 32-bit word,
577 * The first byte of these code points is FE or FF on ASCII platforms. If the
578 * first byte is FF, it will overflow a 32-bit word. */
579#define UTF8_DISALLOW_ABOVE_31_BIT 0x0800
580#define UTF8_WARN_ABOVE_31_BIT 0x1000
581
582/* For back compat, these old names are misleading for UTF_EBCDIC */
583#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_ABOVE_31_BIT
584#define UTF8_WARN_FE_FF UTF8_WARN_ABOVE_31_BIT
949cf498
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585
586#define UTF8_CHECK_ONLY 0x2000
587
588/* For backwards source compatibility. They do nothing, as the default now
589 * includes what they used to mean. The first one's meaning was to allow the
590 * just the single non-character 0xFFFF */
591#define UTF8_ALLOW_FFFF 0
592#define UTF8_ALLOW_SURROGATE 0
593
d35f2ca5 594#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
93e6dbd6
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595 ( UTF8_DISALLOW_SUPER|UTF8_DISALLOW_NONCHAR \
596 |UTF8_DISALLOW_SURROGATE)
949cf498 597#define UTF8_WARN_ILLEGAL_INTERCHANGE \
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598 (UTF8_WARN_SUPER|UTF8_WARN_NONCHAR|UTF8_WARN_SURROGATE)
599#define UTF8_ALLOW_ANY \
600 (~( UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_DISALLOW_ABOVE_31_BIT \
601 |UTF8_WARN_ILLEGAL_INTERCHANGE|UTF8_WARN_ABOVE_31_BIT))
949cf498
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602#define UTF8_ALLOW_ANYUV \
603 (UTF8_ALLOW_EMPTY \
604 & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
9f7f3913
ST
605#define UTF8_ALLOW_DEFAULT (ckWARN(WARN_UTF8) ? 0 : \
606 UTF8_ALLOW_ANYUV)
1d72bdf6 607
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608/* Several of the macros below have a second parameter that is currently
609 * unused; but could be used in the future to make sure that the input is
610 * well-formed. */
611
612#define UTF8_IS_SURROGATE(s, e) cBOOL(is_SURROGATE_utf8(s))
b96a92fb 613#define UTF8_IS_REPLACEMENT(s, send) cBOOL(is_REPLACEMENT_utf8_safe(s,send))
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614
615/* ASCII EBCDIC I8
616 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
617 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
618 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
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619 *
620 * BE AWARE that this test doesn't rule out malformed code points, in
621 * particular overlongs */
7131f24d 622#ifdef EBCDIC /* Both versions assume well-formed UTF8 */
0c58a72b 623# define UTF8_IS_SUPER(s, e) (NATIVE_UTF8_TO_I8(* (U8*) (s)) >= 0xF9 \
bc3632a8 624 && (NATIVE_UTF8_TO_I8(* (U8*) (s)) > 0xF9 \
a3481822 625 || (NATIVE_UTF8_TO_I8(* ((U8*) (s) + 1)) >= 0xA2)))
7131f24d 626#else
0c58a72b
KW
627# define UTF8_IS_SUPER(s, e) (*(U8*) (s) >= 0xF4 \
628 && (*(U8*) (s) > 0xF4 || (*((U8*) (s) + 1) >= 0x90)))
7131f24d
KW
629#endif
630
b96a92fb
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631/* These are now machine generated, and the 'given' clause is no longer
632 * applicable */
0c58a72b 633#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
b96a92fb 634 cBOOL(is_NONCHAR_utf8(s))
0c58a72b
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635#define UTF8_IS_NONCHAR(s, e) \
636 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 637
c867b360
JH
638#define UNICODE_SURROGATE_FIRST 0xD800
639#define UNICODE_SURROGATE_LAST 0xDFFF
640#define UNICODE_REPLACEMENT 0xFFFD
641#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 642
b851fbc1 643/* Though our UTF-8 encoding can go beyond this,
c76687c5 644 * let's be conservative and do as Unicode says. */
b851fbc1
JH
645#define PERL_UNICODE_MAX 0x10FFFF
646
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KW
647#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
648#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
649#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
650#define UNICODE_WARN_ABOVE_31_BIT 0x0008 /* Above 0x7FFF_FFFF */
651#define UNICODE_DISALLOW_SURROGATE 0x0010
652#define UNICODE_DISALLOW_NONCHAR 0x0020
653#define UNICODE_DISALLOW_SUPER 0x0040
654#define UNICODE_DISALLOW_ABOVE_31_BIT 0x0080
bb88be5f
KW
655#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
656 (UNICODE_WARN_SURROGATE|UNICODE_WARN_NONCHAR|UNICODE_WARN_SUPER)
657#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
658 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_NONCHAR|UNICODE_DISALLOW_SUPER)
949cf498
KW
659
660/* For backward source compatibility, as are now the default */
661#define UNICODE_ALLOW_SURROGATE 0
662#define UNICODE_ALLOW_SUPER 0
663#define UNICODE_ALLOW_ANY 0
b851fbc1 664
2d6b3d38
KW
665/* This matches the 2048 code points between UNICODE_SURROGATE_FIRST (0xD800) and
666 * UNICODE_SURROGATE_LAST (0xDFFF) */
667#define UNICODE_IS_SURROGATE(uv) (((UV) (uv) & (~0xFFFF | 0xF800)) \
668 == 0xD800)
669
646d1759
KW
670#define UNICODE_IS_REPLACEMENT(uv) ((UV) (uv) == UNICODE_REPLACEMENT)
671#define UNICODE_IS_BYTE_ORDER_MARK(uv) ((UV) (uv) == UNICODE_BYTE_ORDER_MARK)
672#define UNICODE_IS_NONCHAR(uv) (((UV) (uv) >= 0xFDD0 && (UV) (uv) <= 0xFDEF) \
7131f24d
KW
673 /* The other noncharacters end in FFFE or FFFF, which \
674 * the mask below catches both of, but beyond the last \
675 * official unicode code point, they aren't \
676 * noncharacters, since those aren't Unicode \
677 * characters at all */ \
646d1759
KW
678 || (((((UV) (uv) & 0xFFFE) == 0xFFFE)) && ! UNICODE_IS_SUPER(uv)))
679#define UNICODE_IS_SUPER(uv) ((UV) (uv) > PERL_UNICODE_MAX)
d35f2ca5 680#define UNICODE_IS_ABOVE_31_BIT(uv) ((UV) (uv) > 0x7FFFFFFF)
1d72bdf6 681
ec34087a
KW
682#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
683#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
684 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
685#define MICRO_SIGN MICRO_SIGN_NATIVE
686#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
687 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
688#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
689 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
690#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
691#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
692#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 693#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
694#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
695 of MICRON */
696#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
697#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
698# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
699#endif
74894415
KW
700#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
701#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 702#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
703#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
704#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
705#define KELVIN_SIGN 0x212A
706#define ANGSTROM_SIGN 0x212B
09091399 707
9e55ce06 708#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
709#define UNI_DISPLAY_BACKSLASH 0x0002
710#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
711#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 712
5cd46e1f
KW
713#define ANYOF_FOLD_SHARP_S(node, input, end) \
714 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 715 (ANYOF_NONBITMAP(node)) && \
39065660 716 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 717 ((end) > (input) + 1) && \
305b8651 718 isALPHA_FOLD_EQ((input)[0], 's'))
6302f837 719
ebc501f0 720#define SHARP_S_SKIP 2
3b0fc154 721
a4f7a67c
KW
722/* If you want to exclude surrogates, and beyond legal Unicode, see the blame
723 * log for earlier versions which gave details for these */
4d646140 724
6302f837
KW
725/* A helper macro for isUTF8_CHAR, so use that one, and not this one. This is
726 * retained solely for backwards compatibility and may be deprecated and
727 * removed in a future Perl version.
728 *
729 * regen/regcharclass.pl generates is_UTF8_CHAR_utf8() macros for up to these
d9f92374
KW
730 * number of bytes. So this has to be coordinated with that file */
731#ifdef EBCDIC
732# define IS_UTF8_CHAR_FAST(n) ((n) <= 3)
733#else
734# define IS_UTF8_CHAR_FAST(n) ((n) <= 4)
735#endif
736
4d646140 737#ifndef EBCDIC
6302f837
KW
738/* A helper macro for isUTF8_CHAR, so use that one instead of this. This was
739 * generated by regen/regcharclass.pl, and then moved here. The lines that
740 * generated it were then commented out. This was done solely because it takes
741 * on the order of 10 minutes to generate, and is never going to change, unless
742 * the generated code is improved.
743 *
1ff3baa2
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744 * The EBCDIC versions have been cut to not cover all of legal Unicode,
745 * otherwise they take too long to generate; besides there is a separate one
746 * for each code page, so they are in regcharclass.h instead of here */
39a0f513 747/*
5dca9278 748 UTF8_CHAR: Matches legal UTF-8 encoded characters from 2 through 4 bytes
39a0f513 749
5dca9278 750 0x80 - 0x1FFFFF
39a0f513 751*/
4d646140 752/*** GENERATED CODE ***/
5dca9278
KW
753#define is_UTF8_CHAR_utf8_no_length_checks(s) \
754( ( 0xC2 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xDF ) ? \
755 ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
756: ( 0xE0 == ((U8*)s)[0] ) ? \
757 ( ( ( ( ((U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
758: ( 0xE1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xEF ) ? \
759 ( ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
760: ( 0xF0 == ((U8*)s)[0] ) ? \
761 ( ( ( ( 0x90 <= ((U8*)s)[1] && ((U8*)s)[1] <= 0xBF ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
762: ( ( ( ( 0xF1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xF7 ) && ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )
4d646140 763#endif
3b0fc154 764
6302f837 765/*
5dca9278
KW
766
767=for apidoc Am|STRLEN|isUTF8_CHAR|const U8 *s|const U8 *e
768
769Returns the number of bytes beginning at C<s> which form a legal UTF-8 (or
61b16eb9
KW
770UTF-EBCDIC) encoded character, looking no further than S<C<e - s>> bytes into
771C<s>. Returns 0 if the sequence starting at C<s> through S<C<e - 1>> is not
772well-formed UTF-8.
6302f837
KW
773
774Note that an INVARIANT character (i.e. ASCII on non-EBCDIC
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775machines) is a valid UTF-8 character.
776
777=cut
778*/
6302f837 779
dd9bc2b0 780#define isUTF8_CHAR(s, e) (UNLIKELY((e) <= (s)) \
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781 ? 0 \
782 : (UTF8_IS_INVARIANT(*s)) \
783 ? 1 \
dd9bc2b0 784 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
6302f837 785 ? 0 \
dd9bc2b0 786 : LIKELY(IS_UTF8_CHAR_FAST(UTF8SKIP(s))) \
5dca9278 787 ? is_UTF8_CHAR_utf8_no_length_checks(s) \
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788 : _is_utf8_char_slow(s, e))
789
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790#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
791
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792/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
793 * retained solely for backwards compatibility */
794#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 795
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796#endif /* H_UTF8 */
797
e9a8c099 798/*
14d04a33 799 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 800 */