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numeric.c: Remove unnecessary test
[perl5.git] / utf8.h
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1/* utf8.h
2 *
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3 * This file contains definitions for use with the UTF-8 encoding. It
4 * actually also works with the variant UTF-8 encoding called UTF-EBCDIC, and
5 * hides almost all of the differences between these from the caller. In other
6 * words, someone should #include this file, and if the code is being compiled
7 * on an EBCDIC platform, things should mostly just work.
8 *
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9 * Copyright (C) 2000, 2001, 2002, 2005, 2006, 2007, 2009,
10 * 2010, 2011 by Larry Wall and others
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11 *
12 * You may distribute under the terms of either the GNU General Public
13 * License or the Artistic License, as specified in the README file.
14 *
15 */
16
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17#ifndef H_UTF8 /* Guard against recursive inclusion */
18#define H_UTF8 1
19
39e02b42 20/* Use UTF-8 as the default script encoding?
1e54db1a 21 * Turning this on will break scripts having non-UTF-8 binary
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22 * data (such as Latin-1) in string literals. */
23#ifdef USE_UTF8_SCRIPTS
24# define USE_UTF8_IN_NAMES (!IN_BYTES)
25#else
26# define USE_UTF8_IN_NAMES (PL_hints & HINT_UTF8)
27#endif
28
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29#include "regcharclass.h"
30#include "unicode_constants.h"
31
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32/* For to_utf8_fold_flags, q.v. */
33#define FOLD_FLAGS_LOCALE 0x1
34#define FOLD_FLAGS_FULL 0x2
a0270393 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#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
43#define uvchr_to_utf8_flags(d,uv,flags) \
44 uvoffuni_to_utf8_flags(d,NATIVE_TO_UNI(uv),flags)
45#define utf8_to_uvchr_buf(s, e, lenp) \
842991ae 46 utf8n_to_uvchr(s, (U8*)(e) - (U8*)(s), lenp, \
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47 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY)
48
a0270393 49#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
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50#define to_utf8_fold(c, p, lenp) _to_utf8_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
51#define to_utf8_lower(a,b,c) _to_utf8_lower_flags(a,b,c,0)
52#define to_utf8_upper(a,b,c) _to_utf8_upper_flags(a,b,c,0)
53#define to_utf8_title(a,b,c) _to_utf8_title_flags(a,b,c,0)
36bb2ab6 54
fd7cb289 55/* Source backward compatibility. */
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56#define is_utf8_string_loc(s, len, ep) is_utf8_string_loclen(s, len, ep, 0)
57
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58#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
59 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 60#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 61#define FOLDEQ_LOCALE (1 << 1)
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62#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
63#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
a33c29bc 64
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65/*
66=for apidoc ibcmp_utf8
67
68This is a synonym for (! foldEQ_utf8())
69
70=cut
71*/
72#define ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
73 cBOOL(! foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2))
74
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75#ifdef EBCDIC
76/* The equivalent of these macros but implementing UTF-EBCDIC
77 are in the following header file:
78 */
79
80#include "utfebcdic.h"
fd7cb289 81
d06134e5 82#else /* ! EBCDIC */
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83START_EXTERN_C
84
a0ed51b3 85#ifdef DOINIT
6f06b55f 86EXTCONST unsigned char PL_utf8skip[] = {
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87/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
88/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
89/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
90/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
91/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
92/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
93/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
94/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
95/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
96/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
97/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
98/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
99/* 0xC0 */ 2,2, /* overlong */
100/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
101/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
102/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
103/* 0xF0 */ 4,4,4,4,4,4,4,4,5,5,5,5,6,6, /* above BMP to 2**31 - 1 */
104/* 0xFE */ 7,13, /* Perl extended (never was official UTF-8). Up to 72bit
105 allowed (64-bit + reserved). */
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106};
107#else
6f06b55f 108EXTCONST unsigned char PL_utf8skip[];
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109#endif
110
73c4f7a1 111END_EXTERN_C
7e2040f0 112
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113/* Native character to/from iso-8859-1. Are the identity functions on ASCII
114 * platforms */
115#define NATIVE_TO_LATIN1(ch) (ch)
116#define LATIN1_TO_NATIVE(ch) (ch)
117
118/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
119 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
120 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
121 * because they are 8-bit encodings that serve the same purpose in Perl, and
122 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
123 * whichever one is applicable on the current platform */
124#define NATIVE_UTF8_TO_I8(ch) (ch)
125#define I8_TO_NATIVE_UTF8(ch) (ch)
126
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127/* Transforms in wide UV chars */
128#define UNI_TO_NATIVE(ch) (ch)
129#define NATIVE_TO_UNI(ch) (ch)
d7578b48 130
877d9f0d 131/*
9041c2e3 132
8c007b5a 133 The following table is from Unicode 3.2.
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134
135 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
136
375122d7 137 U+0000..U+007F 00..7F
e1b711da 138 U+0080..U+07FF * C2..DF 80..BF
37e2e78e 139 U+0800..U+0FFF E0 * A0..BF 80..BF
375122d7 140 U+1000..U+CFFF E1..EC 80..BF 80..BF
e1b711da 141 U+D000..U+D7FF ED 80..9F 80..BF
537124e4 142 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
375122d7 143 U+E000..U+FFFF EE..EF 80..BF 80..BF
37e2e78e 144 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
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145 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
146 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
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147 Below are non-Unicode code points
148 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
149 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
537124e4 150 U+200000..: F8.. * 88..BF 80..BF 80..BF 80..BF
877d9f0d 151
e1b711da 152Note the gaps before several of the byte entries above marked by '*'. These are
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153caused by legal UTF-8 avoiding non-shortest encodings: it is technically
154possible to UTF-8-encode a single code point in different ways, but that is
155explicitly forbidden, and the shortest possible encoding should always be used
15824458 156(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 157
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158 */
159
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160/*
161 Another way to look at it, as bits:
162
b2635aa8 163 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 164
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165 0aaa aaaa 0aaa aaaa
166 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
167 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
168 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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169
170As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 171leading bits of the start byte tell how many bytes there are in the
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172encoded character.
173
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174Perl's extended UTF-8 means we can have start bytes up to FF.
175
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176*/
177
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178/* Is the representation of the Unicode code point 'c' the same regardless of
179 * being encoded in UTF-8 or not? */
c4d5f83a 180#define UNI_IS_INVARIANT(c) (((UV)c) < 0x80)
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181
182/* Is the UTF8-encoded byte 'c' part of a variant sequence in UTF-8? This is
183 * the inverse of UTF8_IS_INVARIANT */
184#define UTF8_IS_CONTINUED(c) (((U8)c) & 0x80)
185
186/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
187 * This doesn't catch invariants (they are single-byte). It also excludes the
188 * illegal overlong sequences that begin with C0 and C1. */
0447e8df 189#define UTF8_IS_START(c) (((U8)c) >= 0xc2)
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190
191/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
192 * first byte thereof? */
e021c6e6 193#define UTF8_IS_CONTINUATION(c) ((((U8)c) & 0xC0) == 0x80)
0ae1fa71 194
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195/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
196 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
197 * be well-formed. Masking with 0xfe allows the low bit to be 0 or 1; thus
198 * this matches 0xc[23]. */
559c7f10 199#define UTF8_IS_DOWNGRADEABLE_START(c) (((U8)(c) & 0xfe) == 0xc2)
4ab10950 200
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201/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
202 * represent a code point > 255? */
7b4252f4 203#define UTF8_IS_ABOVE_LATIN1(c) ((U8)(c) >= 0xc4)
8850bf83 204
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205/* This defines the 1-bits that are to be in the first byte of a multi-byte
206 * UTF-8 encoded character that give the number of bytes that comprise the
f710bf0c 207 * character. 'len' is the number of bytes in the multi-byte sequence. */
ee372ee9 208#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : (0xFF & (0xFE << (7-(len)))))
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209
210/* Masks out the initial one bits in a start byte, leaving the real data ones.
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211 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
212 * multi-byte sequence that comprises the character. */
22901f30 213#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
1d72bdf6 214
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215/* This defines the bits that are to be in the continuation bytes of a multi-byte
216 * UTF-8 encoded character that indicate it is a continuation byte. */
1d72bdf6 217#define UTF_CONTINUATION_MARK 0x80
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218
219/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
220 * sequence contributes to the specification of the code point. In the bit
221 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
222 * real information */
1d72bdf6 223#define UTF_ACCUMULATION_SHIFT 6
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224
225/* 2**UTF_ACCUMULATION_SHIFT - 1 */
1d72bdf6 226#define UTF_CONTINUATION_MASK ((U8)0x3f)
c512ce4f 227
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228/* If a value is anded with this, and the result is non-zero, then using the
229 * original value in UTF8_ACCUMULATE will overflow, shifting bits off the left
230 * */
eb83ed87 231#define UTF_ACCUMULATION_OVERFLOW_MASK \
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232 (((UV) UTF_CONTINUATION_MASK) << ((sizeof(UV) * CHARBITS) \
233 - UTF_ACCUMULATION_SHIFT))
eb83ed87 234
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235#if UVSIZE >= 8
236# define UTF8_QUAD_MAX UINT64_C(0x1000000000)
237
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238/* Input is a true Unicode (not-native) code point */
239#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
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240 (uv) < 0x800 ? 2 : \
241 (uv) < 0x10000 ? 3 : \
242 (uv) < 0x200000 ? 4 : \
243 (uv) < 0x4000000 ? 5 : \
244 (uv) < 0x80000000 ? 6 : \
9041c2e3 245 (uv) < UTF8_QUAD_MAX ? 7 : 13 )
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246#else
247/* No, I'm not even going to *TRY* putting #ifdef inside a #define */
5aaebcb3 248#define OFFUNISKIP(uv) ( (uv) < 0x80 ? 1 : \
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249 (uv) < 0x800 ? 2 : \
250 (uv) < 0x10000 ? 3 : \
251 (uv) < 0x200000 ? 4 : \
252 (uv) < 0x4000000 ? 5 : \
253 (uv) < 0x80000000 ? 6 : 7 )
254#endif
255
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256/* How wide can a single UTF-8 encoded character become in bytes. */
257/* NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
258 * is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
259 * expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
260 * non-negative integers in a binary format, even those above Unicode */
261#define UTF8_MAXBYTES 13
262
263/* The maximum number of UTF-8 bytes a single Unicode character can
264 * uppercase/lowercase/fold into. Unicode guarantees that the maximum
265 * expansion is 3 characters. On ASCIIish platforms, the highest Unicode
266 * character occupies 4 bytes, therefore this number would be 12, but this is
267 * smaller than the maximum width a single above-Unicode character can occupy,
268 * so use that instead */
269#if UTF8_MAXBYTES < 12
270#error UTF8_MAXBYTES must be at least 12
271#endif
272
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273/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
274 * for more */
275#define QUESTION_MARK_CTRL DEL_NATIVE
276
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277#define MAX_UTF8_TWO_BYTE 0x7FF
278
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279#define UTF8_MAXBYTES_CASE UTF8_MAXBYTES
280
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281#endif /* EBCDIC vs ASCII */
282
283/* Rest of these are attributes of Unicode and perl's internals rather than the
284 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
285 * this level; the macros that some of these call may have different
286 * definitions in the two encodings */
287
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288/* In domain restricted to ASCII, these may make more sense to the reader than
289 * the ones with Latin1 in the name */
290#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
291#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
292
293/* More or less misleadingly-named defines, retained for back compat */
294#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
295#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
296#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
297#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
298#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 299
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300/* Adds a UTF8 continuation byte 'new' of information to a running total code
301 * point 'old' of all the continuation bytes so far. This is designed to be
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302 * used in a loop to convert from UTF-8 to the code point represented. Note
303 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
304 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
305 * code point in process of being generated */
306#define UTF8_ACCUMULATE(old, new) (((old) << UTF_ACCUMULATION_SHIFT) \
307 | ((NATIVE_UTF8_TO_I8((U8)new)) \
308 & UTF_CONTINUATION_MASK))
d06134e5 309
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310/* This works in the face of malformed UTF-8. */
311#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) (UTF8_IS_DOWNGRADEABLE_START(*s) \
312 && ( (e) - (s) > 1) \
313 && UTF8_IS_CONTINUATION(*((s)+1)))
314
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315/* Number of bytes a code point occupies in UTF-8. */
316#define NATIVE_SKIP(uv) OFFUNISKIP(NATIVE_TO_UNI(uv))
317
318/* Most code which says UNISKIP is really thinking in terms of native code
319 * points (0-255) plus all those beyond. This is an imprecise term, but having
320 * it means existing code continues to work. For precision, use NATIVE_SKIP
321 * and OFFUNISKIP */
322#define UNISKIP(uv) NATIVE_SKIP(uv)
323
94bb8c36 324/* Convert a two (not one) byte utf8 character to a native code point value.
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325 * Needs just one iteration of accumulate. Should not be used unless it is
326 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
327 * Note that the result can be larger than 255 if the input character is not
328 * downgradable */
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329#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
330 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
155d2738 331 (LO)))
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332
333/* Should never be used, and be deprecated */
334#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 335
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336/* How many bytes in the UTF-8 encoded character whose first (perhaps only)
337 * byte is pointed to by 's' */
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338#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
339
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340/* Is the byte 'c' the same character when encoded in UTF-8 as when not. This
341 * works on both UTF-8 encoded strings and non-encoded, as it returns TRUE in
342 * each for the exact same set of bit patterns. (And it works on any byte in a
343 * UTF-8 encoded string) */
bc3632a8 344#define UTF8_IS_INVARIANT(c) UNI_IS_INVARIANT(NATIVE_UTF8_TO_I8(c))
15824458 345
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346/* Like the above, but its name implies a non-UTF8 input, and is implemented
347 * differently (for no particular reason) */
348#define NATIVE_BYTE_IS_INVARIANT(c) UNI_IS_INVARIANT(NATIVE_TO_LATIN1(c))
349
350/* Like the above, but accepts any UV as input */
351#define UVCHR_IS_INVARIANT(uv) UNI_IS_INVARIANT(NATIVE_TO_UNI(uv))
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352
353#define MAX_PORTABLE_UTF8_TWO_BYTE 0x3FF /* constrained by EBCDIC */
354
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355/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
356 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
357 * it must be less than 0x3FF to work across both encodings. */
358
359/* These two are helper macros for the other three sets, and should not be used
360 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
361 * (which works for code points up to 0xFF) or NATIVE_TO_UNI which works for any
362 * code point */
363#define __BASE_TWO_BYTE_HI(c, translate_function) \
364 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
365 | UTF_START_MARK(2))
366#define __BASE_TWO_BYTE_LO(c, translate_function) \
367 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
368 | UTF_CONTINUATION_MARK)
369
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370/* The next two macros should not be used. They were designed to be usable as
371 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 372 * regen/unicode_constants.pl instead */
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373#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
374#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
375
376/* The next two macros are used when the source should be a single byte
377 * character; checked for under DEBUGGING */
378#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
379 ((U8) __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
380#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
381 ((U8) __BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
382
383/* These final two macros in the series are used when the source can be any
384 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
385 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
386 * operator instead of "<=" to avoid getting compiler warnings.
387 * MAX_PORTABLE_UTF8_TWO_BYTE should be exactly all one bits in the lower few
388 * places, so the ~ works */
389#define UTF8_TWO_BYTE_HI(c) \
390 (__ASSERT_((sizeof(c) == 1) \
391 || !(((WIDEST_UTYPE)(c)) & ~MAX_PORTABLE_UTF8_TWO_BYTE)) \
392 ((U8) __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
393#define UTF8_TWO_BYTE_LO(c) \
394 (__ASSERT_((sizeof(c) == 1) \
395 || !(((WIDEST_UTYPE)(c)) & ~MAX_PORTABLE_UTF8_TWO_BYTE)) \
396 ((U8) __BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
d06134e5 397
e7214ce8
KW
398/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
399 * as it is only in overlongs. */
400#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
401
7e2040f0 402/*
e3036cf4 403 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
20df05f4
KW
404 * from an earlier version of these macros in which they didn't call the
405 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
406 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
407 * no need to do it again here
7e2040f0 408 */
e3036cf4
KW
409#define isIDFIRST_lazy_if(p,UTF) ((IN_BYTES || !UTF ) \
410 ? isIDFIRST(*(p)) \
411 : isIDFIRST_utf8((const U8*)p))
32636478
KW
412#define isWORDCHAR_lazy_if(p,UTF) ((IN_BYTES || (!UTF )) \
413 ? isWORDCHAR(*(p)) \
414 : isWORDCHAR_utf8((const U8*)p))
415#define isALNUM_lazy_if(p,UTF) isWORDCHAR_lazy_if(p,UTF)
1d72bdf6 416
89ebb4a3
JH
417#define UTF8_MAXLEN UTF8_MAXBYTES
418
8cb75cc8
KW
419/* A Unicode character can fold to up to 3 characters */
420#define UTF8_MAX_FOLD_CHAR_EXPAND 3
421
a98fe34d 422#define IN_BYTES (CopHINTS_get(PL_curcop) & HINT_BYTES)
0064a8a9 423#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
66cbab2c 424#define IN_UNI_8_BIT \
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KW
425 (CopHINTS_get(PL_curcop) & (HINT_UNI_8_BIT|HINT_LOCALE_NOT_CHARS) \
426 && ! IN_LOCALE_RUNTIME && ! IN_BYTES)
427
1d72bdf6 428
c76687c5
KW
429#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
430
431/* Allow first byte to be a continuation byte */
1d72bdf6 432#define UTF8_ALLOW_CONTINUATION 0x0002
c76687c5
KW
433
434/* Allow second... bytes to be non-continuation bytes */
1d72bdf6 435#define UTF8_ALLOW_NON_CONTINUATION 0x0004
949cf498
KW
436
437/* expecting more bytes than were available in the string */
438#define UTF8_ALLOW_SHORT 0x0008
439
440/* Overlong sequence; i.e., the code point can be specified in fewer bytes. */
441#define UTF8_ALLOW_LONG 0x0010
442
443#define UTF8_DISALLOW_SURROGATE 0x0020 /* Unicode surrogates */
444#define UTF8_WARN_SURROGATE 0x0040
445
446#define UTF8_DISALLOW_NONCHAR 0x0080 /* Unicode non-character */
447#define UTF8_WARN_NONCHAR 0x0100 /* code points */
448
449#define UTF8_DISALLOW_SUPER 0x0200 /* Super-set of Unicode: code */
450#define UTF8_WARN_SUPER 0x0400 /* points above the legal max */
451
452/* Code points which never were part of the original UTF-8 standard, the first
ea5ced44
KW
453 * byte of which is a FE or FF on ASCII platforms. If the first byte is FF, it
454 * will overflow a 32-bit word. If the first byte is FE, it will overflow a
455 * signed 32-bit word. */
949cf498
KW
456#define UTF8_DISALLOW_FE_FF 0x0800
457#define UTF8_WARN_FE_FF 0x1000
458
459#define UTF8_CHECK_ONLY 0x2000
460
461/* For backwards source compatibility. They do nothing, as the default now
462 * includes what they used to mean. The first one's meaning was to allow the
463 * just the single non-character 0xFFFF */
464#define UTF8_ALLOW_FFFF 0
465#define UTF8_ALLOW_SURROGATE 0
466
33d9abfb 467#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_NONCHAR|UTF8_DISALLOW_SURROGATE|UTF8_DISALLOW_FE_FF)
949cf498 468#define UTF8_WARN_ILLEGAL_INTERCHANGE \
33d9abfb 469 (UTF8_WARN_SUPER|UTF8_WARN_NONCHAR|UTF8_WARN_SURROGATE|UTF8_WARN_FE_FF)
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470#define UTF8_ALLOW_ANY \
471 (~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
472#define UTF8_ALLOW_ANYUV \
473 (UTF8_ALLOW_EMPTY \
474 & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
9f7f3913
ST
475#define UTF8_ALLOW_DEFAULT (ckWARN(WARN_UTF8) ? 0 : \
476 UTF8_ALLOW_ANYUV)
1d72bdf6 477
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478/* Surrogates, non-character code points and above-Unicode code points are
479 * problematic in some contexts. This allows code that needs to check for
480 * those to to quickly exclude the vast majority of code points it will
481 * encounter */
b96a92fb
KW
482#define UTF8_FIRST_PROBLEMATIC_CODE_POINT_FIRST_BYTE \
483 FIRST_SURROGATE_UTF8_FIRST_BYTE
7131f24d 484
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485#define UTF8_IS_SURROGATE(s) cBOOL(is_SURROGATE_utf8(s))
486#define UTF8_IS_REPLACEMENT(s, send) cBOOL(is_REPLACEMENT_utf8_safe(s,send))
7131f24d
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487
488/* ASCII EBCDIC I8
489 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
490 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
491 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
492 */
493#ifdef EBCDIC /* Both versions assume well-formed UTF8 */
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KW
494# define UTF8_IS_SUPER(s) (NATIVE_UTF8_TO_I8(* (U8*) (s)) >= 0xF9 \
495 && (NATIVE_UTF8_TO_I8(* (U8*) (s)) > 0xF9 \
a3481822 496 || (NATIVE_UTF8_TO_I8(* ((U8*) (s) + 1)) >= 0xA2)))
7131f24d 497#else
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498# define UTF8_IS_SUPER(s) (*(U8*) (s) >= 0xF4 \
499 && (*(U8*) (s) > 0xF4 || (*((U8*) (s) + 1) >= 0x90)))
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500#endif
501
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502/* These are now machine generated, and the 'given' clause is no longer
503 * applicable */
504#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s) \
505 cBOOL(is_NONCHAR_utf8(s))
506#define UTF8_IS_NONCHAR_(s) \
507 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s)
7131f24d 508
c867b360
JH
509#define UNICODE_SURROGATE_FIRST 0xD800
510#define UNICODE_SURROGATE_LAST 0xDFFF
511#define UNICODE_REPLACEMENT 0xFFFD
512#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 513
b851fbc1 514/* Though our UTF-8 encoding can go beyond this,
c76687c5 515 * let's be conservative and do as Unicode says. */
b851fbc1
JH
516#define PERL_UNICODE_MAX 0x10FFFF
517
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KW
518#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
519#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
520#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
521#define UNICODE_WARN_FE_FF 0x0008 /* Above 0x10FFFF */
522#define UNICODE_DISALLOW_SURROGATE 0x0010
523#define UNICODE_DISALLOW_NONCHAR 0x0020
524#define UNICODE_DISALLOW_SUPER 0x0040
525#define UNICODE_DISALLOW_FE_FF 0x0080
bb88be5f
KW
526#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
527 (UNICODE_WARN_SURROGATE|UNICODE_WARN_NONCHAR|UNICODE_WARN_SUPER)
528#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
529 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_NONCHAR|UNICODE_DISALLOW_SUPER)
949cf498
KW
530
531/* For backward source compatibility, as are now the default */
532#define UNICODE_ALLOW_SURROGATE 0
533#define UNICODE_ALLOW_SUPER 0
534#define UNICODE_ALLOW_ANY 0
b851fbc1 535
1d72bdf6
NIS
536#define UNICODE_IS_SURROGATE(c) ((c) >= UNICODE_SURROGATE_FIRST && \
537 (c) <= UNICODE_SURROGATE_LAST)
a10ec373 538#define UNICODE_IS_REPLACEMENT(c) ((c) == UNICODE_REPLACEMENT)
872c91ae 539#define UNICODE_IS_BYTE_ORDER_MARK(c) ((c) == UNICODE_BYTE_ORDER_MARK)
7131f24d
KW
540#define UNICODE_IS_NONCHAR(c) ((c >= 0xFDD0 && c <= 0xFDEF) \
541 /* The other noncharacters end in FFFE or FFFF, which \
542 * the mask below catches both of, but beyond the last \
543 * official unicode code point, they aren't \
544 * noncharacters, since those aren't Unicode \
545 * characters at all */ \
546 || ((((c & 0xFFFE) == 0xFFFE)) && ! UNICODE_IS_SUPER(c)))
547#define UNICODE_IS_SUPER(c) ((c) > PERL_UNICODE_MAX)
548#define UNICODE_IS_FE_FF(c) ((c) > 0x7FFFFFFF)
1d72bdf6 549
ec34087a
KW
550#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
551#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
552 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
553#define MICRO_SIGN MICRO_SIGN_NATIVE
554#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
555 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
556#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
557 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
558#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
559#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
560#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 561#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
562#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
563 of MICRON */
564#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
565#define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
566#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
567#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
568#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
569#define KELVIN_SIGN 0x212A
570#define ANGSTROM_SIGN 0x212B
09091399 571
9e55ce06 572#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
573#define UNI_DISPLAY_BACKSLASH 0x0002
574#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
575#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 576
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KW
577#define ANYOF_FOLD_SHARP_S(node, input, end) \
578 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 579 (ANYOF_NONBITMAP(node)) && \
39065660 580 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 581 ((end) > (input) + 1) && \
d22b930b
KW
582 toFOLD((input)[0]) == 's' && \
583 toFOLD((input)[1]) == 's')
6302f837 584
ebc501f0 585#define SHARP_S_SKIP 2
3b0fc154 586
a4f7a67c
KW
587/* If you want to exclude surrogates, and beyond legal Unicode, see the blame
588 * log for earlier versions which gave details for these */
4d646140 589
6302f837
KW
590/* A helper macro for isUTF8_CHAR, so use that one, and not this one. This is
591 * retained solely for backwards compatibility and may be deprecated and
592 * removed in a future Perl version.
593 *
594 * regen/regcharclass.pl generates is_UTF8_CHAR_utf8() macros for up to these
d9f92374
KW
595 * number of bytes. So this has to be coordinated with that file */
596#ifdef EBCDIC
597# define IS_UTF8_CHAR_FAST(n) ((n) <= 3)
598#else
599# define IS_UTF8_CHAR_FAST(n) ((n) <= 4)
600#endif
601
4d646140 602#ifndef EBCDIC
6302f837
KW
603/* A helper macro for isUTF8_CHAR, so use that one instead of this. This was
604 * generated by regen/regcharclass.pl, and then moved here. The lines that
605 * generated it were then commented out. This was done solely because it takes
606 * on the order of 10 minutes to generate, and is never going to change, unless
607 * the generated code is improved.
608 *
609 * The EBCDIC versions have been cut to not cover all of legal Unicode, so
610 * don't take too long to generate, and there is a separate one for each code
611 * page, so they are in regcharclass.h instead of here */
39a0f513 612/*
5dca9278 613 UTF8_CHAR: Matches legal UTF-8 encoded characters from 2 through 4 bytes
39a0f513 614
5dca9278 615 0x80 - 0x1FFFFF
39a0f513 616*/
4d646140 617/*** GENERATED CODE ***/
5dca9278
KW
618#define is_UTF8_CHAR_utf8_no_length_checks(s) \
619( ( 0xC2 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xDF ) ? \
620 ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
621: ( 0xE0 == ((U8*)s)[0] ) ? \
622 ( ( ( ( ((U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
623: ( 0xE1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xEF ) ? \
624 ( ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
625: ( 0xF0 == ((U8*)s)[0] ) ? \
626 ( ( ( ( 0x90 <= ((U8*)s)[1] && ((U8*)s)[1] <= 0xBF ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
627: ( ( ( ( 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 628#endif
3b0fc154 629
6302f837 630/*
5dca9278
KW
631=head1 Unicode Support
632
633=for apidoc Am|STRLEN|isUTF8_CHAR|const U8 *s|const U8 *e
634
635Returns the number of bytes beginning at C<s> which form a legal UTF-8 (or
636UTF-EBCDIC) encoded character, looking no further than C<e - s> bytes into
637C<s>. Returns 0 if the sequence starting at C<s> through C<e - 1> is not
638well-formed UTF-8
6302f837
KW
639
640Note that an INVARIANT character (i.e. ASCII on non-EBCDIC
5dca9278
KW
641machines) is a valid UTF-8 character.
642
643=cut
644*/
6302f837 645
dd9bc2b0 646#define isUTF8_CHAR(s, e) (UNLIKELY((e) <= (s)) \
6302f837
KW
647 ? 0 \
648 : (UTF8_IS_INVARIANT(*s)) \
649 ? 1 \
dd9bc2b0 650 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
6302f837 651 ? 0 \
dd9bc2b0 652 : LIKELY(IS_UTF8_CHAR_FAST(UTF8SKIP(s))) \
5dca9278 653 ? is_UTF8_CHAR_utf8_no_length_checks(s) \
6302f837
KW
654 : _is_utf8_char_slow(s, e))
655
3cedd9d9
KW
656#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
657
6302f837
KW
658/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
659 * retained solely for backwards compatibility */
660#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 661
57f0e7e2
KW
662#endif /* H_UTF8 */
663
e9a8c099
MHM
664/*
665 * Local variables:
666 * c-indentation-style: bsd
667 * c-basic-offset: 4
14d04a33 668 * indent-tabs-mode: nil
e9a8c099
MHM
669 * End:
670 *
14d04a33 671 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 672 */