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Change EBCDIC macro definition
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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
a0ed51b3 100#ifdef DOINIT
6f06b55f 101EXTCONST unsigned char PL_utf8skip[] = {
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102/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
103/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
104/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
105/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
106/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
107/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
108/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
109/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
110/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
111/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
112/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
113/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
114/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 115/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
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116/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
117/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
118/* 0xF0 */ 4,4,4,4,4,4,4,4,5,5,5,5,6,6, /* above BMP to 2**31 - 1 */
119/* 0xFE */ 7,13, /* Perl extended (never was official UTF-8). Up to 72bit
120 allowed (64-bit + reserved). */
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121};
122#else
6f06b55f 123EXTCONST unsigned char PL_utf8skip[];
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124#endif
125
73c4f7a1 126END_EXTERN_C
7e2040f0 127
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128/* Native character to/from iso-8859-1. Are the identity functions on ASCII
129 * platforms */
130#define NATIVE_TO_LATIN1(ch) (ch)
131#define LATIN1_TO_NATIVE(ch) (ch)
132
133/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
134 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
135 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
136 * because they are 8-bit encodings that serve the same purpose in Perl, and
137 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
138 * whichever one is applicable on the current platform */
139#define NATIVE_UTF8_TO_I8(ch) (ch)
140#define I8_TO_NATIVE_UTF8(ch) (ch)
141
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142/* Transforms in wide UV chars */
143#define UNI_TO_NATIVE(ch) (ch)
144#define NATIVE_TO_UNI(ch) (ch)
d7578b48 145
877d9f0d 146/*
9041c2e3 147
8c007b5a 148 The following table is from Unicode 3.2.
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149
150 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
151
375122d7 152 U+0000..U+007F 00..7F
e1b711da 153 U+0080..U+07FF * C2..DF 80..BF
37e2e78e 154 U+0800..U+0FFF E0 * A0..BF 80..BF
375122d7 155 U+1000..U+CFFF E1..EC 80..BF 80..BF
e1b711da 156 U+D000..U+D7FF ED 80..9F 80..BF
537124e4 157 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
375122d7 158 U+E000..U+FFFF EE..EF 80..BF 80..BF
37e2e78e 159 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
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160 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
161 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
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162 Below are non-Unicode code points
163 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
164 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
537124e4 165 U+200000..: F8.. * 88..BF 80..BF 80..BF 80..BF
877d9f0d 166
e1b711da 167Note the gaps before several of the byte entries above marked by '*'. These are
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168caused by legal UTF-8 avoiding non-shortest encodings: it is technically
169possible to UTF-8-encode a single code point in different ways, but that is
170explicitly forbidden, and the shortest possible encoding should always be used
15824458 171(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 172
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173 */
174
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175/*
176 Another way to look at it, as bits:
177
b2635aa8 178 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 179
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180 0aaa aaaa 0aaa aaaa
181 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
182 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
183 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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184
185As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 186leading bits of the start byte tell how many bytes there are in the
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187encoded character.
188
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189Perl's extended UTF-8 means we can have start bytes up to FF.
190
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191*/
192
6c88483e 193/* Is the representation of the Unicode code point 'cp' the same regardless of
15824458 194 * being encoded in UTF-8 or not? */
6c88483e 195#define UNI_IS_INVARIANT(cp) isASCII(cp)
15824458 196
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197/* Is the representation of the code point 'cp' the same regardless of
198 * being encoded in UTF-8 or not? 'cp' is native if < 256; Unicode otherwise
199 * */
200#define UVCHR_IS_INVARIANT(uv) UNI_IS_INVARIANT(uv)
201
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202/* Is the UTF8-encoded byte 'c' part of a variant sequence in UTF-8? This is
203 * the inverse of UTF8_IS_INVARIANT */
e4f4ef45 204#define UTF8_IS_CONTINUED(c) (((U8)c) & 0x80)
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205
206/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
207 * This doesn't catch invariants (they are single-byte). It also excludes the
208 * illegal overlong sequences that begin with C0 and C1. */
e4f4ef45 209#define UTF8_IS_START(c) (((U8)c) >= 0xc2)
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210
211/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
212 * first byte thereof? */
e4f4ef45 213#define UTF8_IS_CONTINUATION(c) ((((U8)c) & 0xC0) == 0x80)
0ae1fa71 214
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215/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
216 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
217 * be well-formed. Masking with 0xfe allows the low bit to be 0 or 1; thus
218 * this matches 0xc[23]. */
559c7f10 219#define UTF8_IS_DOWNGRADEABLE_START(c) (((U8)(c) & 0xfe) == 0xc2)
4ab10950 220
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221/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
222 * represent a code point > 255? */
e4f4ef45 223#define UTF8_IS_ABOVE_LATIN1(c) ((U8)(c) >= 0xc4)
8850bf83 224
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225/* This defines the 1-bits that are to be in the first byte of a multi-byte
226 * UTF-8 encoded character that give the number of bytes that comprise the
f710bf0c 227 * character. 'len' is the number of bytes in the multi-byte sequence. */
ee372ee9 228#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : (0xFF & (0xFE << (7-(len)))))
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229
230/* Masks out the initial one bits in a start byte, leaving the real data ones.
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231 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
232 * multi-byte sequence that comprises the character. */
22901f30 233#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
1d72bdf6 234
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235/* This defines the bits that are to be in the continuation bytes of a multi-byte
236 * UTF-8 encoded character that indicate it is a continuation byte. */
1d72bdf6 237#define UTF_CONTINUATION_MARK 0x80
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238
239/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
240 * sequence contributes to the specification of the code point. In the bit
241 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
242 * real information */
1d72bdf6 243#define UTF_ACCUMULATION_SHIFT 6
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244
245/* 2**UTF_ACCUMULATION_SHIFT - 1 */
1d72bdf6 246#define UTF_CONTINUATION_MASK ((U8)0x3f)
c512ce4f 247
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248/* If a value is anded with this, and the result is non-zero, then using the
249 * original value in UTF8_ACCUMULATE will overflow, shifting bits off the left
250 * */
eb83ed87 251#define UTF_ACCUMULATION_OVERFLOW_MASK \
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252 (((UV) UTF_CONTINUATION_MASK) << ((sizeof(UV) * CHARBITS) \
253 - UTF_ACCUMULATION_SHIFT))
eb83ed87 254
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255#if UVSIZE >= 8
256# define UTF8_QUAD_MAX UINT64_C(0x1000000000)
257
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258/* Input is a true Unicode (not-native) code point */
259#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
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260 (uv) < 0x800 ? 2 : \
261 (uv) < 0x10000 ? 3 : \
262 (uv) < 0x200000 ? 4 : \
263 (uv) < 0x4000000 ? 5 : \
264 (uv) < 0x80000000 ? 6 : \
9041c2e3 265 (uv) < UTF8_QUAD_MAX ? 7 : 13 )
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266#else
267/* No, I'm not even going to *TRY* putting #ifdef inside a #define */
5aaebcb3 268#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
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269 (uv) < 0x800 ? 2 : \
270 (uv) < 0x10000 ? 3 : \
271 (uv) < 0x200000 ? 4 : \
272 (uv) < 0x4000000 ? 5 : \
273 (uv) < 0x80000000 ? 6 : 7 )
274#endif
275
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276/* How wide can a single UTF-8 encoded character become in bytes. */
277/* NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
278 * is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
279 * expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
280 * non-negative integers in a binary format, even those above Unicode */
281#define UTF8_MAXBYTES 13
282
283/* The maximum number of UTF-8 bytes a single Unicode character can
284 * uppercase/lowercase/fold into. Unicode guarantees that the maximum
285 * expansion is 3 characters. On ASCIIish platforms, the highest Unicode
286 * character occupies 4 bytes, therefore this number would be 12, but this is
287 * smaller than the maximum width a single above-Unicode character can occupy,
288 * so use that instead */
289#if UTF8_MAXBYTES < 12
290#error UTF8_MAXBYTES must be at least 12
291#endif
292
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293/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
294 * for more */
295#define QUESTION_MARK_CTRL DEL_NATIVE
296
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297#define MAX_UTF8_TWO_BYTE 0x7FF
298
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299#define UTF8_MAXBYTES_CASE UTF8_MAXBYTES
300
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301#endif /* EBCDIC vs ASCII */
302
303/* Rest of these are attributes of Unicode and perl's internals rather than the
304 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
305 * this level; the macros that some of these call may have different
306 * definitions in the two encodings */
307
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308/* In domain restricted to ASCII, these may make more sense to the reader than
309 * the ones with Latin1 in the name */
310#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
311#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
312
313/* More or less misleadingly-named defines, retained for back compat */
314#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
315#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
316#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
317#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
318#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 319
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320/* Adds a UTF8 continuation byte 'new' of information to a running total code
321 * point 'old' of all the continuation bytes so far. This is designed to be
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322 * used in a loop to convert from UTF-8 to the code point represented. Note
323 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
324 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
325 * code point in process of being generated */
326#define UTF8_ACCUMULATE(old, new) (((old) << UTF_ACCUMULATION_SHIFT) \
327 | ((NATIVE_UTF8_TO_I8((U8)new)) \
328 & UTF_CONTINUATION_MASK))
d06134e5 329
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330/* This works in the face of malformed UTF-8. */
331#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) (UTF8_IS_DOWNGRADEABLE_START(*s) \
332 && ( (e) - (s) > 1) \
333 && UTF8_IS_CONTINUATION(*((s)+1)))
334
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335/* Number of bytes a code point occupies in UTF-8. */
336#define NATIVE_SKIP(uv) OFFUNISKIP(NATIVE_TO_UNI(uv))
337
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338/*
339
340=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
341returns the number of bytes required to represent the code point C<cp> when
342encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
343255; a Unicode code point otherwise.
344
345=cut
346 */
347
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348/* Most code which says UNISKIP is really thinking in terms of native code
349 * points (0-255) plus all those beyond. This is an imprecise term, but having
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350 * it means existing code continues to work. For precision, use UVCHR_SKIP,
351 * NATIVE_SKIP, and OFFUNISKIP */
5aaebcb3 352#define UNISKIP(uv) NATIVE_SKIP(uv)
2accb712 353#define UVCHR_SKIP(uv) NATIVE_SKIP(uv)
5aaebcb3 354
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355/* Longer, but more accurate name */
356#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
357
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358/* Convert a UTF-8 variant Latin1 character to a native code point value.
359 * Needs just one iteration of accumulate. Should be used only if it is known
360 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
361 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
362 * representable by two bytes (which turns out to be up through
363 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
364 * HI: a downgradable start byte;
365 * LO: continuation.
366 * */
367#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
368 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
369 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
370 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
371 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
372
94bb8c36 373/* Convert a two (not one) byte utf8 character to a native code point value.
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374 * Needs just one iteration of accumulate. Should not be used unless it is
375 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
376 * Note that the result can be larger than 255 if the input character is not
377 * downgradable */
94bb8c36 378#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
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379 ( __ASSERT_(UTF8SKIP(HI) == 2) \
380 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 381 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 382 (LO))))
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383
384/* Should never be used, and be deprecated */
385#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 386
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387/*
388
389=for apidoc Am|STRLEN|UTF8SKIP|char* s
390returns the number of bytes in the UTF-8 encoded character whose first (perhaps
391only) byte is pointed to by C<s>.
392
393=cut
394 */
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395#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
396#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 397
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398/* Is the byte 'c' the same character when encoded in UTF-8 as when not. This
399 * works on both UTF-8 encoded strings and non-encoded, as it returns TRUE in
400 * each for the exact same set of bit patterns. (And it works on any byte in a
401 * UTF-8 encoded string) */
bc3632a8 402#define UTF8_IS_INVARIANT(c) UNI_IS_INVARIANT(NATIVE_UTF8_TO_I8(c))
15824458 403
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404/* Like the above, but its name implies a non-UTF8 input */
405#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
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406
407#define MAX_PORTABLE_UTF8_TWO_BYTE 0x3FF /* constrained by EBCDIC */
408
48ccf5e1
KW
409/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
410 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
411 * it must be less than 0x3FF to work across both encodings. */
412
413/* These two are helper macros for the other three sets, and should not be used
414 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
1ff3baa2
KW
415 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
416 * for any code point */
48ccf5e1
KW
417#define __BASE_TWO_BYTE_HI(c, translate_function) \
418 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
419 | UTF_START_MARK(2))
420#define __BASE_TWO_BYTE_LO(c, translate_function) \
421 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
422 | UTF_CONTINUATION_MARK)
423
48ccf5e1
KW
424/* The next two macros should not be used. They were designed to be usable as
425 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 426 * regen/unicode_constants.pl instead */
48ccf5e1
KW
427#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
428#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
429
430/* The next two macros are used when the source should be a single byte
431 * character; checked for under DEBUGGING */
432#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
433 ((U8) __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
434#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
435 ((U8) __BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
436
437/* These final two macros in the series are used when the source can be any
438 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
439 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
440 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 441 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
48ccf5e1
KW
442 * places, so the ~ works */
443#define UTF8_TWO_BYTE_HI(c) \
444 (__ASSERT_((sizeof(c) == 1) \
d52b8576 445 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
d9759938 446 ((U8) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
48ccf5e1
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447#define UTF8_TWO_BYTE_LO(c) \
448 (__ASSERT_((sizeof(c) == 1) \
d52b8576 449 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
d9759938 450 ((U8) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 451
e7214ce8
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452/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
453 * as it is only in overlongs. */
454#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
455
7e2040f0 456/*
e3036cf4 457 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
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KW
458 * from an earlier version of these macros in which they didn't call the
459 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
460 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
461 * no need to do it again here
7e2040f0 462 */
e3036cf4
KW
463#define isIDFIRST_lazy_if(p,UTF) ((IN_BYTES || !UTF ) \
464 ? isIDFIRST(*(p)) \
465 : isIDFIRST_utf8((const U8*)p))
32636478
KW
466#define isWORDCHAR_lazy_if(p,UTF) ((IN_BYTES || (!UTF )) \
467 ? isWORDCHAR(*(p)) \
468 : isWORDCHAR_utf8((const U8*)p))
469#define isALNUM_lazy_if(p,UTF) isWORDCHAR_lazy_if(p,UTF)
1d72bdf6 470
89ebb4a3
JH
471#define UTF8_MAXLEN UTF8_MAXBYTES
472
8cb75cc8
KW
473/* A Unicode character can fold to up to 3 characters */
474#define UTF8_MAX_FOLD_CHAR_EXPAND 3
475
a98fe34d 476#define IN_BYTES (CopHINTS_get(PL_curcop) & HINT_BYTES)
bd18bd40
KW
477
478/*
479
480=for apidoc Am|bool|DO_UTF8|SV* sv
481Returns a bool giving whether or not the PV in C<sv> is to be treated as being
482encoded in UTF-8.
483
484You should use this I<after> a call to C<SvPV()> or one of its variants, in
485case any call to string overloading updates the internal UTF-8 encoding flag.
486
487=cut
488*/
0064a8a9 489#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
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490
491/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
492 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
493 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
494 * could be */
495#define IN_UNI_8_BIT \
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KW
496 (((CopHINTS_get(PL_curcop) & (HINT_UNI_8_BIT)) \
497 || (CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
498 /* -1 below is for :not_characters */ \
499 && _is_in_locale_category(FALSE, -1))) \
500 && ! IN_BYTES)
b36bf33f 501
1d72bdf6 502
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503#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
504
505/* Allow first byte to be a continuation byte */
1d72bdf6 506#define UTF8_ALLOW_CONTINUATION 0x0002
c76687c5
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507
508/* Allow second... bytes to be non-continuation bytes */
1d72bdf6 509#define UTF8_ALLOW_NON_CONTINUATION 0x0004
949cf498
KW
510
511/* expecting more bytes than were available in the string */
512#define UTF8_ALLOW_SHORT 0x0008
513
514/* Overlong sequence; i.e., the code point can be specified in fewer bytes. */
515#define UTF8_ALLOW_LONG 0x0010
516
517#define UTF8_DISALLOW_SURROGATE 0x0020 /* Unicode surrogates */
518#define UTF8_WARN_SURROGATE 0x0040
519
520#define UTF8_DISALLOW_NONCHAR 0x0080 /* Unicode non-character */
521#define UTF8_WARN_NONCHAR 0x0100 /* code points */
522
523#define UTF8_DISALLOW_SUPER 0x0200 /* Super-set of Unicode: code */
524#define UTF8_WARN_SUPER 0x0400 /* points above the legal max */
525
526/* Code points which never were part of the original UTF-8 standard, the first
ea5ced44
KW
527 * byte of which is a FE or FF on ASCII platforms. If the first byte is FF, it
528 * will overflow a 32-bit word. If the first byte is FE, it will overflow a
529 * signed 32-bit word. */
949cf498
KW
530#define UTF8_DISALLOW_FE_FF 0x0800
531#define UTF8_WARN_FE_FF 0x1000
532
533#define UTF8_CHECK_ONLY 0x2000
534
535/* For backwards source compatibility. They do nothing, as the default now
536 * includes what they used to mean. The first one's meaning was to allow the
537 * just the single non-character 0xFFFF */
538#define UTF8_ALLOW_FFFF 0
539#define UTF8_ALLOW_SURROGATE 0
540
33d9abfb 541#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_NONCHAR|UTF8_DISALLOW_SURROGATE|UTF8_DISALLOW_FE_FF)
949cf498 542#define UTF8_WARN_ILLEGAL_INTERCHANGE \
33d9abfb 543 (UTF8_WARN_SUPER|UTF8_WARN_NONCHAR|UTF8_WARN_SURROGATE|UTF8_WARN_FE_FF)
949cf498
KW
544#define UTF8_ALLOW_ANY \
545 (~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
546#define UTF8_ALLOW_ANYUV \
547 (UTF8_ALLOW_EMPTY \
548 & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
9f7f3913
ST
549#define UTF8_ALLOW_DEFAULT (ckWARN(WARN_UTF8) ? 0 : \
550 UTF8_ALLOW_ANYUV)
1d72bdf6 551
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552/* Surrogates, non-character code points and above-Unicode code points are
553 * problematic in some contexts. This allows code that needs to check for
554 * those to to quickly exclude the vast majority of code points it will
555 * encounter */
ac6f1fbe
KW
556#ifdef EBCDIC
557# define isUTF8_POSSIBLY_PROBLEMATIC(c) (NATIVE_UTF8_TO_I8(c) >= 0xF1)
558#else
559# define isUTF8_POSSIBLY_PROBLEMATIC(c) ((U8) c >= 0xED)
560#endif
7131f24d 561
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562/* Several of the macros below have a second parameter that is currently
563 * unused; but could be used in the future to make sure that the input is
564 * well-formed. */
565
566#define UTF8_IS_SURROGATE(s, e) cBOOL(is_SURROGATE_utf8(s))
b96a92fb 567#define UTF8_IS_REPLACEMENT(s, send) cBOOL(is_REPLACEMENT_utf8_safe(s,send))
7131f24d
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568
569/* ASCII EBCDIC I8
570 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
571 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
572 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
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573 *
574 * BE AWARE that this test doesn't rule out malformed code points, in
575 * particular overlongs */
7131f24d 576#ifdef EBCDIC /* Both versions assume well-formed UTF8 */
0c58a72b 577# define UTF8_IS_SUPER(s, e) (NATIVE_UTF8_TO_I8(* (U8*) (s)) >= 0xF9 \
bc3632a8 578 && (NATIVE_UTF8_TO_I8(* (U8*) (s)) > 0xF9 \
a3481822 579 || (NATIVE_UTF8_TO_I8(* ((U8*) (s) + 1)) >= 0xA2)))
7131f24d 580#else
0c58a72b
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581# define UTF8_IS_SUPER(s, e) (*(U8*) (s) >= 0xF4 \
582 && (*(U8*) (s) > 0xF4 || (*((U8*) (s) + 1) >= 0x90)))
7131f24d
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583#endif
584
b96a92fb
KW
585/* These are now machine generated, and the 'given' clause is no longer
586 * applicable */
0c58a72b 587#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
b96a92fb 588 cBOOL(is_NONCHAR_utf8(s))
0c58a72b
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589#define UTF8_IS_NONCHAR(s, e) \
590 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 591
c867b360
JH
592#define UNICODE_SURROGATE_FIRST 0xD800
593#define UNICODE_SURROGATE_LAST 0xDFFF
594#define UNICODE_REPLACEMENT 0xFFFD
595#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 596
b851fbc1 597/* Though our UTF-8 encoding can go beyond this,
c76687c5 598 * let's be conservative and do as Unicode says. */
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JH
599#define PERL_UNICODE_MAX 0x10FFFF
600
949cf498
KW
601#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
602#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
603#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
604#define UNICODE_WARN_FE_FF 0x0008 /* Above 0x10FFFF */
605#define UNICODE_DISALLOW_SURROGATE 0x0010
606#define UNICODE_DISALLOW_NONCHAR 0x0020
607#define UNICODE_DISALLOW_SUPER 0x0040
608#define UNICODE_DISALLOW_FE_FF 0x0080
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609#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
610 (UNICODE_WARN_SURROGATE|UNICODE_WARN_NONCHAR|UNICODE_WARN_SUPER)
611#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
612 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_NONCHAR|UNICODE_DISALLOW_SUPER)
949cf498
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613
614/* For backward source compatibility, as are now the default */
615#define UNICODE_ALLOW_SURROGATE 0
616#define UNICODE_ALLOW_SUPER 0
617#define UNICODE_ALLOW_ANY 0
b851fbc1 618
1d72bdf6
NIS
619#define UNICODE_IS_SURROGATE(c) ((c) >= UNICODE_SURROGATE_FIRST && \
620 (c) <= UNICODE_SURROGATE_LAST)
a10ec373 621#define UNICODE_IS_REPLACEMENT(c) ((c) == UNICODE_REPLACEMENT)
872c91ae 622#define UNICODE_IS_BYTE_ORDER_MARK(c) ((c) == UNICODE_BYTE_ORDER_MARK)
7131f24d
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623#define UNICODE_IS_NONCHAR(c) ((c >= 0xFDD0 && c <= 0xFDEF) \
624 /* The other noncharacters end in FFFE or FFFF, which \
625 * the mask below catches both of, but beyond the last \
626 * official unicode code point, they aren't \
627 * noncharacters, since those aren't Unicode \
628 * characters at all */ \
629 || ((((c & 0xFFFE) == 0xFFFE)) && ! UNICODE_IS_SUPER(c)))
630#define UNICODE_IS_SUPER(c) ((c) > PERL_UNICODE_MAX)
631#define UNICODE_IS_FE_FF(c) ((c) > 0x7FFFFFFF)
1d72bdf6 632
ec34087a
KW
633#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
634#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
635 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
636#define MICRO_SIGN MICRO_SIGN_NATIVE
637#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
638 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
639#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
640 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
641#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
642#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
643#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 644#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
645#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
646 of MICRON */
647#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
648#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
649# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
650#endif
74894415
KW
651#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
652#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 653#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
654#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
655#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
656#define KELVIN_SIGN 0x212A
657#define ANGSTROM_SIGN 0x212B
09091399 658
9e55ce06 659#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
660#define UNI_DISPLAY_BACKSLASH 0x0002
661#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
662#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 663
5cd46e1f
KW
664#define ANYOF_FOLD_SHARP_S(node, input, end) \
665 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 666 (ANYOF_NONBITMAP(node)) && \
39065660 667 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 668 ((end) > (input) + 1) && \
305b8651 669 isALPHA_FOLD_EQ((input)[0], 's'))
6302f837 670
ebc501f0 671#define SHARP_S_SKIP 2
3b0fc154 672
a4f7a67c
KW
673/* If you want to exclude surrogates, and beyond legal Unicode, see the blame
674 * log for earlier versions which gave details for these */
4d646140 675
6302f837
KW
676/* A helper macro for isUTF8_CHAR, so use that one, and not this one. This is
677 * retained solely for backwards compatibility and may be deprecated and
678 * removed in a future Perl version.
679 *
680 * regen/regcharclass.pl generates is_UTF8_CHAR_utf8() macros for up to these
d9f92374
KW
681 * number of bytes. So this has to be coordinated with that file */
682#ifdef EBCDIC
683# define IS_UTF8_CHAR_FAST(n) ((n) <= 3)
684#else
685# define IS_UTF8_CHAR_FAST(n) ((n) <= 4)
686#endif
687
4d646140 688#ifndef EBCDIC
6302f837
KW
689/* A helper macro for isUTF8_CHAR, so use that one instead of this. This was
690 * generated by regen/regcharclass.pl, and then moved here. The lines that
691 * generated it were then commented out. This was done solely because it takes
692 * on the order of 10 minutes to generate, and is never going to change, unless
693 * the generated code is improved.
694 *
1ff3baa2
KW
695 * The EBCDIC versions have been cut to not cover all of legal Unicode,
696 * otherwise they take too long to generate; besides there is a separate one
697 * for each code page, so they are in regcharclass.h instead of here */
39a0f513 698/*
5dca9278 699 UTF8_CHAR: Matches legal UTF-8 encoded characters from 2 through 4 bytes
39a0f513 700
5dca9278 701 0x80 - 0x1FFFFF
39a0f513 702*/
4d646140 703/*** GENERATED CODE ***/
5dca9278
KW
704#define is_UTF8_CHAR_utf8_no_length_checks(s) \
705( ( 0xC2 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xDF ) ? \
706 ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
707: ( 0xE0 == ((U8*)s)[0] ) ? \
708 ( ( ( ( ((U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
709: ( 0xE1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xEF ) ? \
710 ( ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
711: ( 0xF0 == ((U8*)s)[0] ) ? \
712 ( ( ( ( 0x90 <= ((U8*)s)[1] && ((U8*)s)[1] <= 0xBF ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
713: ( ( ( ( 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 714#endif
3b0fc154 715
6302f837 716/*
5dca9278
KW
717
718=for apidoc Am|STRLEN|isUTF8_CHAR|const U8 *s|const U8 *e
719
720Returns the number of bytes beginning at C<s> which form a legal UTF-8 (or
61b16eb9
KW
721UTF-EBCDIC) encoded character, looking no further than S<C<e - s>> bytes into
722C<s>. Returns 0 if the sequence starting at C<s> through S<C<e - 1>> is not
723well-formed UTF-8.
6302f837
KW
724
725Note that an INVARIANT character (i.e. ASCII on non-EBCDIC
5dca9278
KW
726machines) is a valid UTF-8 character.
727
728=cut
729*/
6302f837 730
dd9bc2b0 731#define isUTF8_CHAR(s, e) (UNLIKELY((e) <= (s)) \
6302f837
KW
732 ? 0 \
733 : (UTF8_IS_INVARIANT(*s)) \
734 ? 1 \
dd9bc2b0 735 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
6302f837 736 ? 0 \
dd9bc2b0 737 : LIKELY(IS_UTF8_CHAR_FAST(UTF8SKIP(s))) \
5dca9278 738 ? is_UTF8_CHAR_utf8_no_length_checks(s) \
6302f837
KW
739 : _is_utf8_char_slow(s, e))
740
3cedd9d9
KW
741#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
742
6302f837
KW
743/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
744 * retained solely for backwards compatibility */
745#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 746
57f0e7e2
KW
747#endif /* H_UTF8 */
748
e9a8c099 749/*
14d04a33 750 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 751 */