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[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
7bbfa158 37/*
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38=for apidoc is_ascii_string
39
8871a094 40This is a misleadingly-named synonym for L</is_utf8_invariant_string>.
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41On ASCII-ish platforms, the name isn't misleading: the ASCII-range characters
42are exactly the UTF-8 invariants. But EBCDIC machines have more invariants
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43than just the ASCII characters, so C<is_utf8_invariant_string> is preferred.
44
45=for apidoc is_invariant_string
46
47This is a somewhat misleadingly-named synonym for L</is_utf8_invariant_string>.
48C<is_utf8_invariant_string> is preferred, as it indicates under what conditions
49the string is invariant.
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50
51=cut
52*/
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53#define is_ascii_string(s, len) is_utf8_invariant_string(s, len)
54#define is_invariant_string(s, len) is_utf8_invariant_string(s, len)
7bbfa158 55
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56#define uvoffuni_to_utf8_flags(d,uv,flags) \
57 uvoffuni_to_utf8_flags_msgs(d, uv, flags, 0)
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58#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
59#define uvchr_to_utf8_flags(d,uv,flags) \
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60 uvchr_to_utf8_flags_msgs(d,uv,flags, 0)
61#define uvchr_to_utf8_flags_msgs(d,uv,flags,msgs) \
62 uvoffuni_to_utf8_flags_msgs(d,NATIVE_TO_UNI(uv),flags, msgs)
de69f3af 63#define utf8_to_uvchr_buf(s, e, lenp) \
9a9a6c98 64 utf8_to_uvchr_buf_helper((const U8 *) (s), (const U8 *) e, lenp)
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65#define utf8n_to_uvchr(s, len, lenp, flags) \
66 utf8n_to_uvchr_error(s, len, lenp, flags, 0)
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67#define utf8n_to_uvchr_error(s, len, lenp, flags, errors) \
68 utf8n_to_uvchr_msgs(s, len, lenp, flags, errors, 0)
de69f3af 69
a0270393 70#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
a239b1e2 71
eda9cac1 72#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
1604cfb0 73 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 74#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 75#define FOLDEQ_LOCALE (1 << 1)
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76#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
77#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
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78#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
79#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 80
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81#ifdef EBCDIC
82/* The equivalent of these macros but implementing UTF-EBCDIC
83 are in the following header file:
84 */
85
86#include "utfebcdic.h"
fd7cb289 87
d06134e5 88#else /* ! EBCDIC */
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89START_EXTERN_C
90
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91/*
92
93=for apidoc AmnU|STRLEN|UTF8_MAXBYTES
94
95The maximum width of a single UTF-8 encoded character, in bytes.
96
97NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
98is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
99expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
100non-negative integers in a binary format, even those above Unicode.
101
102=cut
103 */
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104#define UTF8_MAXBYTES 13
105
a0ed51b3 106#ifdef DOINIT
6f06b55f 107EXTCONST unsigned char PL_utf8skip[] = {
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108/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
109/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
110/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
111/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
112/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
113/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
114/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
115/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
116/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
117/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
118/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
119/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
120/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 121/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
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122/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
123/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
124/* 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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125 /* Perl extended (never was official UTF-8). Up to 36 bit */
126/* 0xFE */ 7,
127 /* More extended, Up to 72 bits (64-bit + reserved) */
111e8ed9 128/* 0xFF */ UTF8_MAXBYTES
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129};
130#else
6f06b55f 131EXTCONST unsigned char PL_utf8skip[];
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132#endif
133
73c4f7a1 134END_EXTERN_C
7e2040f0 135
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136/*
137
138=for apidoc Am|U8|NATIVE_TO_LATIN1|U8 ch
139
140Returns the Latin-1 (including ASCII and control characters) equivalent of the
141input native code point given by C<ch>. Thus, C<NATIVE_TO_LATIN1(193)> on
142EBCDIC platforms returns 65. These each represent the character C<"A"> on
143their respective platforms. On ASCII platforms no conversion is needed, so
144this macro expands to just its input, adding no time nor space requirements to
145the implementation.
146
147For conversion of code points potentially larger than will fit in a character,
148use L</NATIVE_TO_UNI>.
149
150=for apidoc Am|U8|LATIN1_TO_NATIVE|U8 ch
151
152Returns the native equivalent of the input Latin-1 code point (including ASCII
153and control characters) given by C<ch>. Thus, C<LATIN1_TO_NATIVE(66)> on
154EBCDIC platforms returns 194. These each represent the character C<"B"> on
155their respective platforms. On ASCII platforms no conversion is needed, so
156this macro expands to just its input, adding no time nor space requirements to
157the implementation.
158
159For conversion of code points potentially larger than will fit in a character,
160use L</UNI_TO_NATIVE>.
161
162=for apidoc Am|UV|NATIVE_TO_UNI|UV ch
163
164Returns the Unicode equivalent of the input native code point given by C<ch>.
165Thus, C<NATIVE_TO_UNI(195)> on EBCDIC platforms returns 67. These each
166represent the character C<"C"> on their respective platforms. On ASCII
167platforms no conversion is needed, so this macro expands to just its input,
168adding no time nor space requirements to the implementation.
169
170=for apidoc Am|UV|UNI_TO_NATIVE|UV ch
171
172Returns the native equivalent of the input Unicode code point given by C<ch>.
173Thus, C<UNI_TO_NATIVE(68)> on EBCDIC platforms returns 196. These each
174represent the character C<"D"> on their respective platforms. On ASCII
175platforms no conversion is needed, so this macro expands to just its input,
176adding no time nor space requirements to the implementation.
177
178=cut
179*/
180
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181#define NATIVE_TO_LATIN1(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
182#define LATIN1_TO_NATIVE(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
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183
184/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
185 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
186 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
187 * because they are 8-bit encodings that serve the same purpose in Perl, and
188 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
189 * whichever one is applicable on the current platform */
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190#define NATIVE_UTF8_TO_I8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
191#define I8_TO_NATIVE_UTF8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) ((ch) | 0)))
59a449d5 192
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193#define UNI_TO_NATIVE(ch) ((UV) ((ch) | 0))
194#define NATIVE_TO_UNI(ch) ((UV) ((ch) | 0))
d7578b48 195
877d9f0d 196/*
9041c2e3 197
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198 The following table is from Unicode 3.2, plus the Perl extensions for above
199 U+10FFFF
877d9f0d 200
a14e0a36 201 Code Points 1st Byte 2nd Byte 3rd 4th 5th 6th 7th 8th-13th
877d9f0d 202
375122d7 203 U+0000..U+007F 00..7F
e1b711da 204 U+0080..U+07FF * C2..DF 80..BF
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205 U+0800..U+0FFF E0 * A0..BF 80..BF
206 U+1000..U+CFFF E1..EC 80..BF 80..BF
207 U+D000..U+D7FF ED 80..9F 80..BF
208 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
209 U+E000..U+FFFF EE..EF 80..BF 80..BF
210 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
211 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
212 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
213 Below are above-Unicode code points
214 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
215 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
216 U+200000..U+FFFFFF F8 * 88..BF 80..BF 80..BF 80..BF
217U+1000000..U+3FFFFFF F9..FB 80..BF 80..BF 80..BF 80..BF
218U+4000000..U+3FFFFFFF FC * 84..BF 80..BF 80..BF 80..BF 80..BF
219U+40000000..U+7FFFFFFF FD 80..BF 80..BF 80..BF 80..BF 80..BF
220U+80000000..U+FFFFFFFFF FE * 82..BF 80..BF 80..BF 80..BF 80..BF 80..BF
221U+1000000000.. FF 80..BF 80..BF 80..BF 80..BF 80..BF * 81..BF 80..BF
877d9f0d 222
e1b711da 223Note the gaps before several of the byte entries above marked by '*'. These are
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224caused by legal UTF-8 avoiding non-shortest encodings: it is technically
225possible to UTF-8-encode a single code point in different ways, but that is
226explicitly forbidden, and the shortest possible encoding should always be used
15824458 227(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 228
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229 */
230
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231/*
232 Another way to look at it, as bits:
233
b2635aa8 234 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 235
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236 0aaa aaaa 0aaa aaaa
237 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
238 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
239 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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240
241As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 242leading bits of the start byte tell how many bytes there are in the
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243encoded character.
244
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245Perl's extended UTF-8 means we can have start bytes up through FF, though any
246beginning with FF yields a code point that is too large for 32-bit ASCII
247platforms. FF signals to use 13 bytes for the encoded character. This breaks
248the paradigm that the number of leading bits gives how many total bytes there
ab2e28c2 249are in the character. */
38953e5a 250
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251/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
252 * sequence contributes to the specification of the code point. In the bit
253 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
254 * real information */
1d72bdf6 255#define UTF_ACCUMULATION_SHIFT 6
b2635aa8 256
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257/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
258 * for more */
259#define QUESTION_MARK_CTRL DEL_NATIVE
260
261/* Surrogates, non-character code points and above-Unicode code points are
262 * problematic in some contexts. This allows code that needs to check for
a3815e44 263 * those to quickly exclude the vast majority of code points it will
fed423a5 264 * encounter */
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265#define isUTF8_POSSIBLY_PROBLEMATIC(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
266 (U8) c >= 0xED)
fed423a5 267
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268#define UNICODE_IS_PERL_EXTENDED(uv) UNLIKELY((UV) (uv) > 0x7FFFFFFF)
269
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270#endif /* EBCDIC vs ASCII */
271
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272/* 2**UTF_ACCUMULATION_SHIFT - 1. This masks out all but the bits that carry
273 * real information in a continuation byte. This turns out to be 0x3F in
274 * UTF-8, 0x1F in UTF-EBCDIC. */
d223e1ea 275#define UTF_CONTINUATION_MASK ((U8) (nBIT_MASK(UTF_ACCUMULATION_SHIFT)))
fed423a5 276
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277/* For use in UTF8_IS_CONTINUATION(). This turns out to be 0xC0 in UTF-8,
278 * E0 in UTF-EBCDIC */
279#define UTF_IS_CONTINUATION_MASK ((U8) (0xFF << UTF_ACCUMULATION_SHIFT))
280
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281/* This defines the bits that are to be in the continuation bytes of a
282 * multi-byte UTF-8 encoded character that mark it is a continuation byte.
283 * This turns out to be 0x80 in UTF-8, 0xA0 in UTF-EBCDIC. (khw doesn't know
284 * the underlying reason that B0 works here) */
285#define UTF_CONTINUATION_MARK (UTF_IS_CONTINUATION_MASK & 0xB0)
286
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287/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
288 * first byte thereof? */
289#define UTF8_IS_CONTINUATION(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
290 (((NATIVE_UTF8_TO_I8(c) & UTF_IS_CONTINUATION_MASK) \
291 == UTF_CONTINUATION_MARK)))
292
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293/* Is the representation of the Unicode code point 'cp' the same regardless of
294 * being encoded in UTF-8 or not? This is a fundamental property of
295 * UTF-8,EBCDIC */
296#define OFFUNI_IS_INVARIANT(c) (((WIDEST_UTYPE)(c)) < UTF_CONTINUATION_MARK)
297
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298/*
299=for apidoc Am|bool|UVCHR_IS_INVARIANT|UV cp
300
301Evaluates to 1 if the representation of code point C<cp> is the same whether or
302not it is encoded in UTF-8; otherwise evaluates to 0. UTF-8 invariant
303characters can be copied as-is when converting to/from UTF-8, saving time.
304C<cp> is Unicode if above 255; otherwise is platform-native.
305
306=cut
307 */
308#define UVCHR_IS_INVARIANT(cp) (OFFUNI_IS_INVARIANT(NATIVE_TO_UNI(cp)))
309
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310/* Internal macro to be used only in this file to aid in constructing other
311 * publicly accessible macros.
312 * The number of bytes required to express this uv in UTF-8, for just those
313 * uv's requiring 2 through 6 bytes, as these are common to all platforms and
314 * word sizes. The number of bytes needed is given by the number of leading 1
315 * bits in the start byte. There are 32 start bytes that have 2 initial 1 bits
316 * (C0-DF); there are 16 that have 3 initial 1 bits (E0-EF); 8 that have 4
317 * initial 1 bits (F0-F8); 4 that have 5 initial 1 bits (F9-FB), and 2 that
318 * have 6 initial 1 bits (FC-FD). The largest number a string of n bytes can
319 * represent is (the number of possible start bytes for 'n')
320 * * (the number of possiblities for each start byte
321 * The latter in turn is
322 * 2 ** ( (how many continuation bytes there are)
323 * * (the number of bits of information each
324 * continuation byte holds))
325 *
326 * If we were on a platform where we could use a fast find first set bit
327 * instruction (or count leading zeros instruction) this could be replaced by
328 * using that to find the log2 of the uv, and divide that by the number of bits
329 * of information in each continuation byte, adjusting for large cases and how
330 * much information is in a start byte for that length */
72164d3a 331#define __COMMON_UNI_SKIP(uv) \
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332 (UV) (uv) < (32 * (1U << ( UTF_ACCUMULATION_SHIFT))) ? 2 : \
333 (UV) (uv) < (16 * (1U << (2 * UTF_ACCUMULATION_SHIFT))) ? 3 : \
334 (UV) (uv) < ( 8 * (1U << (3 * UTF_ACCUMULATION_SHIFT))) ? 4 : \
335 (UV) (uv) < ( 4 * (1U << (4 * UTF_ACCUMULATION_SHIFT))) ? 5 : \
336 (UV) (uv) < ( 2 * (1U << (5 * UTF_ACCUMULATION_SHIFT))) ? 6 :
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337
338/* Internal macro to be used only in this file.
339 * This adds to __COMMON_UNI_SKIP the details at this platform's upper range.
fed423a5 340 * For any-sized EBCDIC platforms, or 64-bit ASCII ones, we need one more test
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341 * to see if just 7 bytes is needed, or if the maximum is needed. For 32-bit
342 * ASCII platforms, everything is representable by 7 bytes */
fed423a5 343#if defined(UV_IS_QUAD) || defined(EBCDIC)
72164d3a 344# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) \
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345 LIKELY((UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT))) \
346 ? 7 \
347 : UTF8_MAXBYTES)
1d68d6cd 348#else
72164d3a 349# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
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350#endif
351
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352/* The next two macros use the base macro defined above, and add in the tests
353 * at the low-end of the range, for just 1 byte, yielding complete macros,
354 * publicly accessible. */
355
356/* Input is a true Unicode (not-native) code point */
357#define OFFUNISKIP(uv) (OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
2084b489 358
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359/*
360
361=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
362returns the number of bytes required to represent the code point C<cp> when
363encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
364255; a Unicode code point otherwise.
365
366=cut
367 */
fdb6583d 368#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 369
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370#define UTF_MIN_START_BYTE \
371 ((UTF_CONTINUATION_MARK >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
372
373/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
59645eb1 374 * This excludes invariants (they are single-byte). It also excludes the
4bab39bc 375 * illegal overlong sequences that begin with C0 and C1 on ASCII platforms, and
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376 * C0-C4 I8 start bytes on EBCDIC ones. On EBCDIC E0 can't start a
377 * non-overlong sequence, so we define a base macro and for those platforms,
378 * extend it to also exclude E0 */
379#define UTF8_IS_START_base(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4bab39bc 380 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_START_BYTE))
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381#ifdef EBCDIC
382# define UTF8_IS_START(c) \
383 (UTF8_IS_START_base(c) && (c) != I8_TO_NATIVE_UTF8(0xE0))
384#else
385# define UTF8_IS_START(c) UTF8_IS_START_base(c)
386#endif
4bab39bc 387
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388#define UTF_MIN_ABOVE_LATIN1_BYTE \
389 ((0x100 >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
390
391/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
392 * represent a code point > 255? */
393#define UTF8_IS_ABOVE_LATIN1(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
394 (NATIVE_UTF8_TO_I8(c) >= UTF_MIN_ABOVE_LATIN1_BYTE))
395
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396/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
397 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
398 * be well-formed. */
399#define UTF8_IS_DOWNGRADEABLE_START(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
400 inRANGE(NATIVE_UTF8_TO_I8(c), \
401 UTF_MIN_START_BYTE, UTF_MIN_ABOVE_LATIN1_BYTE - 1))
402
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403/* The largest code point representable by two UTF-8 bytes on this platform.
404 * As explained in the comments for __COMMON_UNI_SKIP, 32 start bytes with
fed423a5 405 * UTF_ACCUMULATION_SHIFT bits of information each */
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406#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
407
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408/* The largest code point representable by two UTF-8 bytes on any platform that
409 * Perl runs on. This value is constrained by EBCDIC which has 5 bits per
410 * continuation byte */
924b0bfd 411#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * nBIT_UMAX(5))
aa206fb7 412
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413/*
414
415=for apidoc AmnU|STRLEN|UTF8_MAXBYTES_CASE
416
417The maximum number of UTF-8 bytes a single Unicode character can
418uppercase/lowercase/titlecase/fold into.
419
420=cut
421
422 * Unicode guarantees that the maximum expansion is UTF8_MAX_FOLD_CHAR_EXPAND
423 * characters, but any above-Unicode code point will fold to itself, so we only
424 * have to look at the expansion of the maximum Unicode code point. But this
425 * number may be less than the space occupied by a very large code point under
426 * Perl's extended UTF-8. We have to make it large enough to fit any single
427 * character. (It turns out that ASCII and EBCDIC differ in which is larger)
428 *
429=cut
430*/
c03c0950 431#define UTF8_MAXBYTES_CASE \
ae9a9edb 432 MAX(UTF8_MAXBYTES, UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF))
c03c0950 433
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434/* Rest of these are attributes of Unicode and perl's internals rather than the
435 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
436 * this level; the macros that some of these call may have different
437 * definitions in the two encodings */
438
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439/* In domain restricted to ASCII, these may make more sense to the reader than
440 * the ones with Latin1 in the name */
441#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
442#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
443
444/* More or less misleadingly-named defines, retained for back compat */
445#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
446#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
447#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
448#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
449#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 450
c0236afe 451/* This defines the 1-bits that are to be in the first byte of a multi-byte
97d0ceda 452 * UTF-8 encoded character that mark it as a start byte and give the number of
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453 * bytes that comprise the character. 'len' is that number.
454 *
455 * To illustrate: len = 2 => ((U8) ~ 0b0011_1111) or 1100_0000
456 * 7 => ((U8) ~ 0b0000_0001) or 1111_1110
457 * > 7 => 0xFF
458 *
459 * This is not to be used on a single-byte character. As in many places in
460 * perl, U8 must be 8 bits
461 */
462#define UTF_START_MARK(len) ((U8) ~(0xFF >> (len)))
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463
464/* Masks out the initial one bits in a start byte, leaving the real data ones.
465 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
466 * multi-byte sequence that comprises the character. */
8974941d 467#define UTF_START_MASK(len) (UNLIKELY((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
c0236afe 468
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469/* Adds a UTF8 continuation byte 'new' of information to a running total code
470 * point 'old' of all the continuation bytes so far. This is designed to be
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471 * used in a loop to convert from UTF-8 to the code point represented. Note
472 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
473 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
474 * code point in process of being generated */
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475#define UTF8_ACCUMULATE(old, new) (__ASSERT_(FITS_IN_8_BITS(new)) \
476 ((old) << UTF_ACCUMULATION_SHIFT) \
009097b1 477 | ((NATIVE_UTF8_TO_I8(new)) \
155d2738 478 & UTF_CONTINUATION_MASK))
d06134e5 479
4ab10950 480/* This works in the face of malformed UTF-8. */
4e1ed312 481#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) \
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482 ( ( (e) - (s) > 1) \
483 && UTF8_IS_DOWNGRADEABLE_START(*(s)) \
4e1ed312 484 && UTF8_IS_CONTINUATION(*((s)+1)))
4ab10950 485
5aaebcb3 486/* Number of bytes a code point occupies in UTF-8. */
5352a763 487#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 488
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489/* Most code which says UNISKIP is really thinking in terms of native code
490 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 491 * it means existing code continues to work. For precision, use UVCHR_SKIP,
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492 * NATIVE_SKIP, or OFFUNISKIP */
493#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 494
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495/* Longer, but more accurate name */
496#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
497
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498/* Convert a UTF-8 variant Latin1 character to a native code point value.
499 * Needs just one iteration of accumulate. Should be used only if it is known
500 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
501 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
502 * representable by two bytes (which turns out to be up through
503 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
504 * HI: a downgradable start byte;
505 * LO: continuation.
506 * */
507#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
508 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
509 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
510 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
511 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
512
94bb8c36 513/* Convert a two (not one) byte utf8 character to a native code point value.
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514 * Needs just one iteration of accumulate. Should not be used unless it is
515 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
516 * Note that the result can be larger than 255 if the input character is not
517 * downgradable */
94bb8c36 518#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
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519 (__ASSERT_(FITS_IN_8_BITS(HI)) \
520 __ASSERT_(FITS_IN_8_BITS(LO)) \
521 __ASSERT_(PL_utf8skip[HI] == 2) \
522 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 523 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 524 (LO))))
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525
526/* Should never be used, and be deprecated */
527#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 528
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529/*
530
531=for apidoc Am|STRLEN|UTF8SKIP|char* s
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532returns the number of bytes a non-malformed UTF-8 encoded character whose first
533(perhaps only) byte is pointed to by C<s>.
534
535If there is a possibility of malformed input, use instead:
536
537=over
538
eb992c6f 539=item C<L</UTF8_SAFE_SKIP>> if you know the maximum ending pointer in the
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540buffer pointed to by C<s>; or
541
eb992c6f 542=item C<L</UTF8_CHK_SKIP>> if you don't know it.
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543
544=back
545
546It is better to restructure your code so the end pointer is passed down so that
547you know what it actually is at the point of this call, but if that isn't
eb992c6f 548possible, C<L</UTF8_CHK_SKIP>> can minimize the chance of accessing beyond the end
ee0ff0f5 549of the input buffer.
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550
551=cut
552 */
2a70536e 553#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
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554
555/*
556=for apidoc Am|STRLEN|UTF8_SKIP|char* s
eb992c6f 557This is a synonym for C<L</UTF8SKIP>>
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558
559=cut
560*/
561
2a70536e 562#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 563
85fcc8f2 564/*
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565=for apidoc Am|STRLEN|UTF8_CHK_SKIP|char* s
566
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567This is a safer version of C<L</UTF8SKIP>>, but still not as safe as
568C<L</UTF8_SAFE_SKIP>>. This version doesn't blindly assume that the input
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569string pointed to by C<s> is well-formed, but verifies that there isn't a NUL
570terminating character before the expected end of the next character in C<s>.
571The length C<UTF8_CHK_SKIP> returns stops just before any such NUL.
572
573Perl tends to add NULs, as an insurance policy, after the end of strings in
574SV's, so it is likely that using this macro will prevent inadvertent reading
575beyond the end of the input buffer, even if it is malformed UTF-8.
576
577This macro is intended to be used by XS modules where the inputs could be
578malformed, and it isn't feasible to restructure to use the safer
eb992c6f 579C<L</UTF8_SAFE_SKIP>>, for example when interfacing with a C library.
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580
581=cut
582*/
583
584#define UTF8_CHK_SKIP(s) \
8974941d 585 (UNLIKELY(s[0] == '\0') ? 1 : MIN(UTF8SKIP(s), \
f87d8789 586 my_strnlen((char *) (s), UTF8SKIP(s))))
ee0ff0f5 587/*
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588
589=for apidoc Am|STRLEN|UTF8_SAFE_SKIP|char* s|char* e
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590returns 0 if S<C<s E<gt>= e>>; otherwise returns the number of bytes in the
591UTF-8 encoded character whose first byte is pointed to by C<s>. But it never
592returns beyond C<e>. On DEBUGGING builds, it asserts that S<C<s E<lt>= e>>.
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593
594=cut
595 */
45671da2 596#define UTF8_SAFE_SKIP(s, e) (__ASSERT_((e) >= (s)) \
8974941d 597 UNLIKELY(((e) - (s)) <= 0) \
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598 ? 0 \
599 : MIN(((e) - (s)), UTF8_SKIP(s)))
85fcc8f2 600
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601/* Most code that says 'UNI_' really means the native value for code points up
602 * through 255 */
603#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
604
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605/*
606=for apidoc Am|bool|UTF8_IS_INVARIANT|char c
607
608Evaluates to 1 if the byte C<c> represents the same character when encoded in
609UTF-8 as when not; otherwise evaluates to 0. UTF-8 invariant characters can be
610copied as-is when converting to/from UTF-8, saving time.
611
612In spite of the name, this macro gives the correct result if the input string
613from which C<c> comes is not encoded in UTF-8.
614
615See C<L</UVCHR_IS_INVARIANT>> for checking if a UV is invariant.
616
617=cut
618
619The reason it works on both UTF-8 encoded strings and non-UTF-8 encoded, is
620that it returns TRUE in each for the exact same set of bit patterns. It is
621valid on a subset of what UVCHR_IS_INVARIANT is valid on, so can just use that;
622and the compiler should optimize out anything extraneous given the
623implementation of the latter. The |0 makes sure this isn't mistakenly called
624with a ptr argument.
625*/
5c06326b 626#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT((c) | 0)
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627
628/* Like the above, but its name implies a non-UTF8 input, which as the comments
629 * above show, doesn't matter as to its implementation */
38953e5a 630#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 631
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632/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
633 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT. */
634#define UTF8_IS_CONTINUED(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
635 (! UTF8_IS_INVARIANT(c)))
636
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637/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
638 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
639 * it must be less than 0x3FF to work across both encodings. */
640
641/* These two are helper macros for the other three sets, and should not be used
642 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
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643 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
644 * for any code point */
48ccf5e1 645#define __BASE_TWO_BYTE_HI(c, translate_function) \
2863dafa 646 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 647 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
2863dafa 648 | UTF_START_MARK(2)))
48ccf5e1 649#define __BASE_TWO_BYTE_LO(c, translate_function) \
2863dafa 650 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 651 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
2863dafa 652 | UTF_CONTINUATION_MARK))
48ccf5e1 653
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654/* The next two macros should not be used. They were designed to be usable as
655 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 656 * regen/unicode_constants.pl instead */
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657#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
658#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
659
660/* The next two macros are used when the source should be a single byte
661 * character; checked for under DEBUGGING */
662#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 663 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 664#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 665 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
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666
667/* These final two macros in the series are used when the source can be any
668 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
669 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
670 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 671 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
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672 * places, so the ~ works */
673#define UTF8_TWO_BYTE_HI(c) \
674 (__ASSERT_((sizeof(c) == 1) \
d52b8576 675 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 676 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
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677#define UTF8_TWO_BYTE_LO(c) \
678 (__ASSERT_((sizeof(c) == 1) \
d52b8576 679 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 680 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 681
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682/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
683 * as it is only in overlongs. */
684#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
685
7e2040f0 686/*
e3036cf4 687 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
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688 * from an earlier version of these macros in which they didn't call the
689 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
690 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
691 * no need to do it again here
7e2040f0 692 */
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693#define isIDFIRST_lazy_if_safe(p, e, UTF) \
694 ((IN_BYTES || !UTF) \
695 ? isIDFIRST(*(p)) \
696 : isIDFIRST_utf8_safe(p, e))
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697#define isWORDCHAR_lazy_if_safe(p, e, UTF) \
698 ((IN_BYTES || !UTF) \
699 ? isWORDCHAR(*(p)) \
700 : isWORDCHAR_utf8_safe((U8 *) p, (U8 *) e))
4c1d9526 701#define isALNUM_lazy_if_safe(p, e, UTF) isWORDCHAR_lazy_if_safe(p, e, UTF)
da8c1a98 702
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703#define UTF8_MAXLEN UTF8_MAXBYTES
704
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705/* A Unicode character can fold to up to 3 characters */
706#define UTF8_MAX_FOLD_CHAR_EXPAND 3
707
d3481830 708#define IN_BYTES UNLIKELY(CopHINTS_get(PL_curcop) & HINT_BYTES)
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709
710/*
711
712=for apidoc Am|bool|DO_UTF8|SV* sv
713Returns a bool giving whether or not the PV in C<sv> is to be treated as being
714encoded in UTF-8.
715
716You should use this I<after> a call to C<SvPV()> or one of its variants, in
717case any call to string overloading updates the internal UTF-8 encoding flag.
718
719=cut
720*/
0064a8a9 721#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
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722
723/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
724 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
725 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
726 * could be */
70844984 727#define IN_UNI_8_BIT \
1604cfb0 728 (( ( (CopHINTS_get(PL_curcop) & HINT_UNI_8_BIT)) \
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729 || ( CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
730 /* -1 below is for :not_characters */ \
731 && _is_in_locale_category(FALSE, -1))) \
732 && (! IN_BYTES))
b36bf33f 733
1d72bdf6 734
c76687c5 735#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
2b5e7bc2 736#define UTF8_GOT_EMPTY UTF8_ALLOW_EMPTY
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737
738/* Allow first byte to be a continuation byte */
1d72bdf6 739#define UTF8_ALLOW_CONTINUATION 0x0002
2b5e7bc2 740#define UTF8_GOT_CONTINUATION UTF8_ALLOW_CONTINUATION
c76687c5 741
cd01d3b1 742/* Unexpected non-continuation byte */
1d72bdf6 743#define UTF8_ALLOW_NON_CONTINUATION 0x0004
2b5e7bc2 744#define UTF8_GOT_NON_CONTINUATION UTF8_ALLOW_NON_CONTINUATION
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745
746/* expecting more bytes than were available in the string */
747#define UTF8_ALLOW_SHORT 0x0008
2b5e7bc2 748#define UTF8_GOT_SHORT UTF8_ALLOW_SHORT
949cf498 749
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750/* Overlong sequence; i.e., the code point can be specified in fewer bytes.
751 * First one will convert the overlong to the REPLACEMENT CHARACTER; second
752 * will return what the overlong evaluates to */
949cf498 753#define UTF8_ALLOW_LONG 0x0010
94953955 754#define UTF8_ALLOW_LONG_AND_ITS_VALUE (UTF8_ALLOW_LONG|0x0020)
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755#define UTF8_GOT_LONG UTF8_ALLOW_LONG
756
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757#define UTF8_ALLOW_OVERFLOW 0x0080
758#define UTF8_GOT_OVERFLOW UTF8_ALLOW_OVERFLOW
949cf498 759
f180b292 760#define UTF8_DISALLOW_SURROGATE 0x0100 /* Unicode surrogates */
2b5e7bc2 761#define UTF8_GOT_SURROGATE UTF8_DISALLOW_SURROGATE
f180b292 762#define UTF8_WARN_SURROGATE 0x0200
949cf498 763
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764/* Unicode non-character code points */
765#define UTF8_DISALLOW_NONCHAR 0x0400
2b5e7bc2 766#define UTF8_GOT_NONCHAR UTF8_DISALLOW_NONCHAR
c4e96019 767#define UTF8_WARN_NONCHAR 0x0800
949cf498 768
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769/* Super-set of Unicode: code points above the legal max */
770#define UTF8_DISALLOW_SUPER 0x1000
2b5e7bc2 771#define UTF8_GOT_SUPER UTF8_DISALLOW_SUPER
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772#define UTF8_WARN_SUPER 0x2000
773
774/* The original UTF-8 standard did not define UTF-8 with start bytes of 0xFE or
775 * 0xFF, though UTF-EBCDIC did. This allowed both versions to represent code
776 * points up to 2 ** 31 - 1. Perl extends UTF-8 so that 0xFE and 0xFF are
777 * usable on ASCII platforms, and 0xFF means something different than
778 * UTF-EBCDIC defines. These changes allow code points of 64 bits (actually
779 * somewhat more) to be represented on both platforms. But these are Perl
780 * extensions, and not likely to be interchangeable with other languages. Note
781 * that on ASCII platforms, FE overflows a signed 32-bit word, and FF an
782 * unsigned one. */
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783#define UTF8_DISALLOW_PERL_EXTENDED 0x4000
784#define UTF8_GOT_PERL_EXTENDED UTF8_DISALLOW_PERL_EXTENDED
785#define UTF8_WARN_PERL_EXTENDED 0x8000
d35f2ca5 786
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787/* For back compat, these old names are misleading for overlongs and
788 * UTF_EBCDIC. */
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789#define UTF8_DISALLOW_ABOVE_31_BIT UTF8_DISALLOW_PERL_EXTENDED
790#define UTF8_GOT_ABOVE_31_BIT UTF8_GOT_PERL_EXTENDED
791#define UTF8_WARN_ABOVE_31_BIT UTF8_WARN_PERL_EXTENDED
792#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_PERL_EXTENDED
793#define UTF8_WARN_FE_FF UTF8_WARN_PERL_EXTENDED
949cf498 794
f180b292 795#define UTF8_CHECK_ONLY 0x10000
99a765e9 796#define _UTF8_NO_CONFIDENCE_IN_CURLEN 0x20000 /* Internal core use only */
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797
798/* For backwards source compatibility. They do nothing, as the default now
799 * includes what they used to mean. The first one's meaning was to allow the
800 * just the single non-character 0xFFFF */
801#define UTF8_ALLOW_FFFF 0
c825ef8c 802#define UTF8_ALLOW_FE_FF 0
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803#define UTF8_ALLOW_SURROGATE 0
804
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805/* C9 refers to Unicode Corrigendum #9: allows but discourages non-chars */
806#define UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE \
807 (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_SURROGATE)
808#define UTF8_WARN_ILLEGAL_C9_INTERCHANGE (UTF8_WARN_SUPER|UTF8_WARN_SURROGATE)
809
d35f2ca5 810#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 811 (UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE|UTF8_DISALLOW_NONCHAR)
949cf498 812#define UTF8_WARN_ILLEGAL_INTERCHANGE \
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813 (UTF8_WARN_ILLEGAL_C9_INTERCHANGE|UTF8_WARN_NONCHAR)
814
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815/* This is typically used for code that processes UTF-8 input and doesn't want
816 * to have to deal with any malformations that might be present. All such will
817 * be safely replaced by the REPLACEMENT CHARACTER, unless other flags
818 * overriding this are also present. */
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819#define UTF8_ALLOW_ANY ( UTF8_ALLOW_CONTINUATION \
820 |UTF8_ALLOW_NON_CONTINUATION \
821 |UTF8_ALLOW_SHORT \
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822 |UTF8_ALLOW_LONG \
823 |UTF8_ALLOW_OVERFLOW)
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824
825/* Accept any Perl-extended UTF-8 that evaluates to any UV on the platform, but
cd01d3b1 826 * not any malformed. This is the default. */
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827#define UTF8_ALLOW_ANYUV 0
828#define UTF8_ALLOW_DEFAULT UTF8_ALLOW_ANYUV
1d72bdf6 829
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830/*
831=for apidoc Am|bool|UTF8_IS_SURROGATE|const U8 *s|const U8 *e
832
833Evaluates to non-zero if the first few bytes of the string starting at C<s> and
834looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
835of the Unicode surrogate code points; otherwise it evaluates to 0. If
836non-zero, the value gives how many bytes starting at C<s> comprise the code
837point's representation.
838
839=cut
840 */
841#define UTF8_IS_SURROGATE(s, e) is_SURROGATE_utf8_safe(s, e)
842
843
844#define UTF8_IS_REPLACEMENT(s, send) is_REPLACEMENT_utf8_safe(s,send)
845
285aa1f0 846#define MAX_LEGAL_CP ((UV)IV_MAX)
40606899 847
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848/*
849=for apidoc Am|bool|UTF8_IS_SUPER|const U8 *s|const U8 *e
850
851Recall that Perl recognizes an extension to UTF-8 that can encode code
852points larger than the ones defined by Unicode, which are 0..0x10FFFF.
853
854This macro evaluates to non-zero if the first few bytes of the string starting
855at C<s> and looking no further than S<C<e - 1>> are from this UTF-8 extension;
856otherwise it evaluates to 0. If non-zero, the value gives how many bytes
857starting at C<s> comprise the code point's representation.
858
8590 is returned if the bytes are not well-formed extended UTF-8, or if they
860represent a code point that cannot fit in a UV on the current platform. Hence
861this macro can give different results when run on a 64-bit word machine than on
862one with a 32-bit word size.
0c58a72b 863
891fd405 864Note that it is illegal to have code points that are larger than what can
89d986df 865fit in an IV on the current machine.
7131f24d 866
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867=cut
868
869 * ASCII EBCDIC I8
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870 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
871 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
872 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
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873 */
874#ifdef EBCDIC
a14e0a36 875# define UTF8_IS_SUPER(s, e) \
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876 (( ((e) > (s) + 4) \
877 && (NATIVE_UTF8_TO_I8(*(s)) >= 0xF9) \
878 && UNLIKELY( NATIVE_UTF8_TO_I8(*(s)) > 0xF9 \
879 || (NATIVE_UTF8_TO_I8(*((s) + 1)) >= 0xA2)) \
880 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
0cf25474 881 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
7131f24d 882#else
a14e0a36 883# define UTF8_IS_SUPER(s, e) \
8974941d 884 (( ((e) > (s) + 3) \
89d986df 885 && (*(U8*) (s)) >= 0xF4 \
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886 && (UNLIKELY( ((*(U8*) (s)) > 0xF4) \
887 || (*((U8*) (s) + 1) >= 0x90))) \
89d986df 888 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
1376b35c 889 ? is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
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890#endif
891
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892/* These are now machine generated, and the 'given' clause is no longer
893 * applicable */
0c58a72b 894#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
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895 cBOOL(is_NONCHAR_utf8_safe(s,e))
896
897/*
898=for apidoc Am|bool|UTF8_IS_NONCHAR|const U8 *s|const U8 *e
899
900Evaluates to non-zero if the first few bytes of the string starting at C<s> and
901looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
902of the Unicode non-character code points; otherwise it evaluates to 0. If
903non-zero, the value gives how many bytes starting at C<s> comprise the code
904point's representation.
905
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906=for apidoc AmnU|UV|UNICODE_REPLACEMENT
907
908Evaluates to 0xFFFD, the code point of the Unicode REPLACEMENT CHARACTER
909
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910=cut
911 */
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912#define UTF8_IS_NONCHAR(s, e) \
913 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 914
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JH
915#define UNICODE_SURROGATE_FIRST 0xD800
916#define UNICODE_SURROGATE_LAST 0xDFFF
917#define UNICODE_REPLACEMENT 0xFFFD
918#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 919
b851fbc1 920/* Though our UTF-8 encoding can go beyond this,
c76687c5 921 * let's be conservative and do as Unicode says. */
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JH
922#define PERL_UNICODE_MAX 0x10FFFF
923
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924#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
925#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
926#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
927#define UNICODE_WARN_PERL_EXTENDED 0x0008 /* Above 0x7FFF_FFFF */
928#define UNICODE_WARN_ABOVE_31_BIT UNICODE_WARN_PERL_EXTENDED
929#define UNICODE_DISALLOW_SURROGATE 0x0010
930#define UNICODE_DISALLOW_NONCHAR 0x0020
931#define UNICODE_DISALLOW_SUPER 0x0040
932#define UNICODE_DISALLOW_PERL_EXTENDED 0x0080
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933
934#ifdef PERL_CORE
935# define UNICODE_ALLOW_ABOVE_IV_MAX 0x0100
936#endif
d044b7a7 937#define UNICODE_DISALLOW_ABOVE_31_BIT UNICODE_DISALLOW_PERL_EXTENDED
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938
939#define UNICODE_GOT_SURROGATE UNICODE_DISALLOW_SURROGATE
940#define UNICODE_GOT_NONCHAR UNICODE_DISALLOW_NONCHAR
941#define UNICODE_GOT_SUPER UNICODE_DISALLOW_SUPER
942#define UNICODE_GOT_PERL_EXTENDED UNICODE_DISALLOW_PERL_EXTENDED
943
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944#define UNICODE_WARN_ILLEGAL_C9_INTERCHANGE \
945 (UNICODE_WARN_SURROGATE|UNICODE_WARN_SUPER)
bb88be5f 946#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
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947 (UNICODE_WARN_ILLEGAL_C9_INTERCHANGE|UNICODE_WARN_NONCHAR)
948#define UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE \
949 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_SUPER)
bb88be5f 950#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 951 (UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE|UNICODE_DISALLOW_NONCHAR)
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952
953/* For backward source compatibility, as are now the default */
954#define UNICODE_ALLOW_SURROGATE 0
955#define UNICODE_ALLOW_SUPER 0
956#define UNICODE_ALLOW_ANY 0
b851fbc1 957
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958/* This matches the 2048 code points between these */
959#define UNICODE_IS_SURROGATE(uv) UNLIKELY(inRANGE(uv, UNICODE_SURROGATE_FIRST, \
960 UNICODE_SURROGATE_LAST))
2d6b3d38 961
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962#define UNICODE_IS_REPLACEMENT(uv) UNLIKELY((UV) (uv) == UNICODE_REPLACEMENT)
963#define UNICODE_IS_BYTE_ORDER_MARK(uv) UNLIKELY((UV) (uv) \
964 == UNICODE_BYTE_ORDER_MARK)
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965
966/* Is 'uv' one of the 32 contiguous-range noncharacters? */
21e13fc5
KW
967#define UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) \
968 UNLIKELY(inRANGE(uv, 0xFDD0, 0xFDEF))
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969
970/* Is 'uv' one of the 34 plane-ending noncharacters 0xFFFE, 0xFFFF, 0x1FFFE,
971 * 0x1FFFF, ... 0x10FFFE, 0x10FFFF, given that we know that 'uv' is not above
972 * the Unicode legal max */
973#define UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv) \
8974941d 974 UNLIKELY(((UV) (uv) & 0xFFFE) == 0xFFFE)
c149ab20
KW
975
976#define UNICODE_IS_NONCHAR(uv) \
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KW
977 ( UNLIKELY(UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv)) \
978 || ( UNLIKELY(UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)) \
979 && LIKELY(! UNICODE_IS_SUPER(uv))))
c149ab20 980
8974941d 981#define UNICODE_IS_SUPER(uv) UNLIKELY((UV) (uv) > PERL_UNICODE_MAX)
1d72bdf6 982
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KW
983#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
984#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
985 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
986#define MICRO_SIGN MICRO_SIGN_NATIVE
987#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
988 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
989#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
990 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
991#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
992#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
993#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 994#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
995#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
996 of MICRON */
997#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
998#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
999# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
1000#endif
74894415
KW
1001#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
1002#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 1003#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
1004#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
1005#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
1006#define KELVIN_SIGN 0x212A
1007#define ANGSTROM_SIGN 0x212B
09091399 1008
9e55ce06 1009#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41 1010#define UNI_DISPLAY_BACKSLASH 0x0002
daf6caf1
KW
1011#define UNI_DISPLAY_BACKSPACE 0x0004 /* Allow \b when also
1012 UNI_DISPLAY_BACKSLASH */
1013#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT \
1014 |UNI_DISPLAY_BACKSLASH \
1015 |UNI_DISPLAY_BACKSPACE)
1016
1017/* Character classes could also allow \b, but not patterns in general */
c728cb41 1018#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 1019
e0ffa6d6 1020/* Should be removed; maybe deprecated, but not used in CPAN */
ebc501f0 1021#define SHARP_S_SKIP 2
3b0fc154 1022
3cedd9d9 1023#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
976c1b08
KW
1024#define bytes_from_utf8(s, lenp, is_utf8p) \
1025 bytes_from_utf8_loc(s, lenp, is_utf8p, 0)
3cedd9d9 1026
e23e8bc1
KW
1027/*
1028
25e3a4e0
KW
1029=for apidoc Am|STRLEN|isUTF8_CHAR_flags|const U8 *s|const U8 *e| const U32 flags
1030
1031Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1032looking no further than S<C<e - 1>> are well-formed UTF-8, as extended by Perl,
1033that represents some code point, subject to the restrictions given by C<flags>;
1034otherwise it evaluates to 0. If non-zero, the value gives how many bytes
2717076a
KW
1035starting at C<s> comprise the code point's representation. Any bytes remaining
1036before C<e>, but beyond the ones needed to form the first code point in C<s>,
1037are not examined.
25e3a4e0
KW
1038
1039If C<flags> is 0, this gives the same results as C<L</isUTF8_CHAR>>;
1040if C<flags> is C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, this gives the same results
1041as C<L</isSTRICT_UTF8_CHAR>>;
1042and if C<flags> is C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE>, this gives
1043the same results as C<L</isC9_STRICT_UTF8_CHAR>>.
1044Otherwise C<flags> may be any combination of the C<UTF8_DISALLOW_I<foo>> flags
1045understood by C<L</utf8n_to_uvchr>>, with the same meanings.
1046
1047The three alternative macros are for the most commonly needed validations; they
1048are likely to run somewhat faster than this more general one, as they can be
1049inlined into your code.
1050
9f2abfde
KW
1051Use L</is_utf8_string_flags>, L</is_utf8_string_loc_flags>, and
1052L</is_utf8_string_loclen_flags> to check entire strings.
1053
25e3a4e0
KW
1054=cut
1055*/
1056
1057#define isUTF8_CHAR_flags(s, e, flags) \
1058 (UNLIKELY((e) <= (s)) \
1059 ? 0 \
1060 : (UTF8_IS_INVARIANT(*s)) \
1061 ? 1 \
1062 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1063 ? 0 \
1376b35c 1064 : is_utf8_char_helper(s, e, flags))
25e3a4e0 1065
6302f837
KW
1066/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
1067 * retained solely for backwards compatibility */
1068#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 1069
6a5bc5ac 1070#endif /* PERL_UTF8_H_ */
57f0e7e2 1071
e9a8c099 1072/*
14d04a33 1073 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 1074 */