3 * Copyright (c) 1998-2001, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * 'What a fix!' said Sam. 'That's the one place in all the lands we've ever
12 * heard of that we don't want to see any closer; and that's the one place
13 * we're trying to get to! And that's just where we can't get, nohow.'
15 * 'Well do I understand your speech,' he answered in the same language;
16 * 'yet few strangers do so. Why then do you not speak in the Common Tongue,
17 * as is the custom in the West, if you wish to be answered?'
19 * ...the travellers perceived that the floor was paved with stones of many
20 * hues; branching runes and strange devices intertwined beneath their feet.
24 #define PERL_IN_UTF8_C
30 =for apidoc A|U8 *|uvuni_to_utf8_flags|U8 *d|UV uv|UV flags
32 Adds the UTF8 representation of the Unicode codepoint C<uv> to the end
33 of the string C<d>; C<d> should be have at least C<UTF8_MAXLEN+1> free
34 bytes available. The return value is the pointer to the byte after the
35 end of the new character. In other words,
37 d = uvuni_to_utf8_flags(d, uv, flags);
41 d = uvuni_to_utf8(d, uv);
43 (which is equivalent to)
45 d = uvuni_to_utf8_flags(d, uv, 0);
47 is the recommended Unicode-aware way of saying
55 Perl_uvuni_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags)
57 if (ckWARN_d(WARN_UTF8)) {
58 if (UNICODE_IS_SURROGATE(uv) &&
59 !(flags & UNICODE_ALLOW_SURROGATE))
60 Perl_warner(aTHX_ WARN_UTF8, "UTF-16 surrogate 0x%04"UVxf, uv);
62 ((uv >= 0xFDD0 && uv <= 0xFDEF &&
63 !(flags & UNICODE_ALLOW_FDD0))
65 ((uv & 0xFFFF) == 0xFFFE &&
66 !(flags & UNICODE_ALLOW_FFFE))
68 ((uv & 0xFFFF) == 0xFFFF &&
69 !(flags & UNICODE_ALLOW_FFFF))) &&
70 /* UNICODE_ALLOW_SUPER includes
71 * FFFEs and FFFFs beyond 0x10FFFF. */
72 ((uv <= PERL_UNICODE_MAX) ||
73 !(flags & UNICODE_ALLOW_SUPER))
75 Perl_warner(aTHX_ WARN_UTF8,
76 "Unicode character 0x%04"UVxf" is illegal", uv);
78 if (UNI_IS_INVARIANT(uv)) {
79 *d++ = UTF_TO_NATIVE(uv);
84 STRLEN len = UNISKIP(uv);
87 *p-- = UTF_TO_NATIVE((uv & UTF_CONTINUATION_MASK) | UTF_CONTINUATION_MARK);
88 uv >>= UTF_ACCUMULATION_SHIFT;
90 *p = UTF_TO_NATIVE((uv & UTF_START_MASK(len)) | UTF_START_MARK(len));
93 #else /* Non loop style */
95 *d++ = (( uv >> 6) | 0xc0);
96 *d++ = (( uv & 0x3f) | 0x80);
100 *d++ = (( uv >> 12) | 0xe0);
101 *d++ = (((uv >> 6) & 0x3f) | 0x80);
102 *d++ = (( uv & 0x3f) | 0x80);
106 *d++ = (( uv >> 18) | 0xf0);
107 *d++ = (((uv >> 12) & 0x3f) | 0x80);
108 *d++ = (((uv >> 6) & 0x3f) | 0x80);
109 *d++ = (( uv & 0x3f) | 0x80);
112 if (uv < 0x4000000) {
113 *d++ = (( uv >> 24) | 0xf8);
114 *d++ = (((uv >> 18) & 0x3f) | 0x80);
115 *d++ = (((uv >> 12) & 0x3f) | 0x80);
116 *d++ = (((uv >> 6) & 0x3f) | 0x80);
117 *d++ = (( uv & 0x3f) | 0x80);
120 if (uv < 0x80000000) {
121 *d++ = (( uv >> 30) | 0xfc);
122 *d++ = (((uv >> 24) & 0x3f) | 0x80);
123 *d++ = (((uv >> 18) & 0x3f) | 0x80);
124 *d++ = (((uv >> 12) & 0x3f) | 0x80);
125 *d++ = (((uv >> 6) & 0x3f) | 0x80);
126 *d++ = (( uv & 0x3f) | 0x80);
130 if (uv < UTF8_QUAD_MAX)
133 *d++ = 0xfe; /* Can't match U+FEFF! */
134 *d++ = (((uv >> 30) & 0x3f) | 0x80);
135 *d++ = (((uv >> 24) & 0x3f) | 0x80);
136 *d++ = (((uv >> 18) & 0x3f) | 0x80);
137 *d++ = (((uv >> 12) & 0x3f) | 0x80);
138 *d++ = (((uv >> 6) & 0x3f) | 0x80);
139 *d++ = (( uv & 0x3f) | 0x80);
144 *d++ = 0xff; /* Can't match U+FFFE! */
145 *d++ = 0x80; /* 6 Reserved bits */
146 *d++ = (((uv >> 60) & 0x0f) | 0x80); /* 2 Reserved bits */
147 *d++ = (((uv >> 54) & 0x3f) | 0x80);
148 *d++ = (((uv >> 48) & 0x3f) | 0x80);
149 *d++ = (((uv >> 42) & 0x3f) | 0x80);
150 *d++ = (((uv >> 36) & 0x3f) | 0x80);
151 *d++ = (((uv >> 30) & 0x3f) | 0x80);
152 *d++ = (((uv >> 24) & 0x3f) | 0x80);
153 *d++ = (((uv >> 18) & 0x3f) | 0x80);
154 *d++ = (((uv >> 12) & 0x3f) | 0x80);
155 *d++ = (((uv >> 6) & 0x3f) | 0x80);
156 *d++ = (( uv & 0x3f) | 0x80);
160 #endif /* Loop style */
164 Perl_uvuni_to_utf8(pTHX_ U8 *d, UV uv)
166 return Perl_uvuni_to_utf8_flags(aTHX_ d, uv, 0);
171 =for apidoc A|STRLEN|is_utf8_char|U8 *s
173 Tests if some arbitrary number of bytes begins in a valid UTF-8
174 character. Note that an INVARIANT (i.e. ASCII) character is a valid UTF-8 character.
175 The actual number of bytes in the UTF-8 character will be returned if
176 it is valid, otherwise 0.
181 Perl_is_utf8_char(pTHX_ U8 *s)
187 if (UTF8_IS_INVARIANT(u))
190 if (!UTF8_IS_START(u))
195 if (len < 2 || !UTF8_IS_CONTINUATION(s[1]))
200 u &= UTF_START_MASK(len);
204 if (!UTF8_IS_CONTINUATION(*s))
206 uv = UTF8_ACCUMULATE(uv, *s);
213 if (UNISKIP(uv) < len)
220 =for apidoc A|bool|is_utf8_string|U8 *s|STRLEN len
222 Returns true if first C<len> bytes of the given string form a valid UTF8
223 string, false otherwise. Note that 'a valid UTF8 string' does not mean
224 'a string that contains UTF8' because a valid ASCII string is a valid
231 Perl_is_utf8_string(pTHX_ U8 *s, STRLEN len)
238 len = strlen((char *)s);
254 =for apidoc A|UV|utf8n_to_uvuni|U8 *s|STRLEN curlen|STRLEN *retlen|U32 flags
256 Bottom level UTF-8 decode routine.
257 Returns the unicode code point value of the first character in the string C<s>
258 which is assumed to be in UTF8 encoding and no longer than C<curlen>;
259 C<retlen> will be set to the length, in bytes, of that character.
261 If C<s> does not point to a well-formed UTF8 character, the behaviour
262 is dependent on the value of C<flags>: if it contains UTF8_CHECK_ONLY,
263 it is assumed that the caller will raise a warning, and this function
264 will silently just set C<retlen> to C<-1> and return zero. If the
265 C<flags> does not contain UTF8_CHECK_ONLY, warnings about
266 malformations will be given, C<retlen> will be set to the expected
267 length of the UTF-8 character in bytes, and zero will be returned.
269 The C<flags> can also contain various flags to allow deviations from
270 the strict UTF-8 encoding (see F<utf8.h>).
272 Most code should use utf8_to_uvchr() rather than call this directly.
278 Perl_utf8n_to_uvuni(pTHX_ U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags)
283 bool dowarn = ckWARN_d(WARN_UTF8);
285 STRLEN expectlen = 0;
288 /* This list is a superset of the UTF8_ALLOW_XXX. */
290 #define UTF8_WARN_EMPTY 1
291 #define UTF8_WARN_CONTINUATION 2
292 #define UTF8_WARN_NON_CONTINUATION 3
293 #define UTF8_WARN_FE_FF 4
294 #define UTF8_WARN_SHORT 5
295 #define UTF8_WARN_OVERFLOW 6
296 #define UTF8_WARN_SURROGATE 7
297 #define UTF8_WARN_BOM 8
298 #define UTF8_WARN_LONG 9
299 #define UTF8_WARN_FFFF 10
302 !(flags & UTF8_ALLOW_EMPTY)) {
303 warning = UTF8_WARN_EMPTY;
307 if (UTF8_IS_INVARIANT(uv)) {
310 return (UV) (NATIVE_TO_UTF(*s));
313 if (UTF8_IS_CONTINUATION(uv) &&
314 !(flags & UTF8_ALLOW_CONTINUATION)) {
315 warning = UTF8_WARN_CONTINUATION;
319 if (UTF8_IS_START(uv) && curlen > 1 && !UTF8_IS_CONTINUATION(s[1]) &&
320 !(flags & UTF8_ALLOW_NON_CONTINUATION)) {
321 warning = UTF8_WARN_NON_CONTINUATION;
326 uv = NATIVE_TO_UTF(uv);
328 if ((uv == 0xfe || uv == 0xff) &&
329 !(flags & UTF8_ALLOW_FE_FF)) {
330 warning = UTF8_WARN_FE_FF;
335 if (!(uv & 0x20)) { len = 2; uv &= 0x1f; }
336 else if (!(uv & 0x10)) { len = 3; uv &= 0x0f; }
337 else if (!(uv & 0x08)) { len = 4; uv &= 0x07; }
338 else if (!(uv & 0x04)) { len = 5; uv &= 0x03; }
340 else if (!(uv & 0x02)) { len = 6; uv &= 0x01; }
341 else { len = 7; uv &= 0x01; }
343 else if (!(uv & 0x02)) { len = 6; uv &= 0x01; }
344 else if (!(uv & 0x01)) { len = 7; uv = 0; }
345 else { len = 13; uv = 0; } /* whoa! */
353 if ((curlen < expectlen) &&
354 !(flags & UTF8_ALLOW_SHORT)) {
355 warning = UTF8_WARN_SHORT;
364 if (!UTF8_IS_CONTINUATION(*s) &&
365 !(flags & UTF8_ALLOW_NON_CONTINUATION)) {
367 warning = UTF8_WARN_NON_CONTINUATION;
371 uv = UTF8_ACCUMULATE(uv, *s);
373 /* These cannot be allowed. */
375 if (!(flags & UTF8_ALLOW_LONG)) {
376 warning = UTF8_WARN_LONG;
380 else { /* uv < ouv */
381 /* This cannot be allowed. */
382 warning = UTF8_WARN_OVERFLOW;
390 if (UNICODE_IS_SURROGATE(uv) &&
391 !(flags & UTF8_ALLOW_SURROGATE)) {
392 warning = UTF8_WARN_SURROGATE;
394 } else if (UNICODE_IS_BYTE_ORDER_MARK(uv) &&
395 !(flags & UTF8_ALLOW_BOM)) {
396 warning = UTF8_WARN_BOM;
398 } else if ((expectlen > UNISKIP(uv)) &&
399 !(flags & UTF8_ALLOW_LONG)) {
400 warning = UTF8_WARN_LONG;
402 } else if (UNICODE_IS_ILLEGAL(uv) &&
403 !(flags & UTF8_ALLOW_FFFF)) {
404 warning = UTF8_WARN_FFFF;
412 if (flags & UTF8_CHECK_ONLY) {
419 SV* sv = sv_2mortal(newSVpv("Malformed UTF-8 character ", 0));
422 case 0: /* Intentionally empty. */ break;
423 case UTF8_WARN_EMPTY:
424 Perl_sv_catpvf(aTHX_ sv, "(empty string)");
426 case UTF8_WARN_CONTINUATION:
427 Perl_sv_catpvf(aTHX_ sv, "(unexpected continuation byte 0x%02"UVxf", with no preceding start byte)", uv);
429 case UTF8_WARN_NON_CONTINUATION:
431 Perl_sv_catpvf(aTHX_ sv, "(unexpected non-continuation byte 0x%02"UVxf", immediately after start byte 0x%02"UVxf")",
432 (UV)s[1], startbyte);
434 Perl_sv_catpvf(aTHX_ sv, "(unexpected non-continuation byte 0x%02"UVxf", %d byte%s after start byte 0x%02"UVxf", expected %d bytes)",
435 (UV)s[1], s - s0, s - s0 > 1 ? "s" : "", startbyte, expectlen);
438 case UTF8_WARN_FE_FF:
439 Perl_sv_catpvf(aTHX_ sv, "(byte 0x%02"UVxf")", uv);
441 case UTF8_WARN_SHORT:
442 Perl_sv_catpvf(aTHX_ sv, "(%d byte%s, need %d, after start byte 0x%02"UVxf")",
443 curlen, curlen == 1 ? "" : "s", expectlen, startbyte);
444 expectlen = curlen; /* distance for caller to skip */
446 case UTF8_WARN_OVERFLOW:
447 Perl_sv_catpvf(aTHX_ sv, "(overflow at 0x%"UVxf", byte 0x%02x, after start byte 0x%02"UVxf")",
450 case UTF8_WARN_SURROGATE:
451 Perl_sv_catpvf(aTHX_ sv, "(UTF-16 surrogate 0x%04"UVxf")", uv);
454 Perl_sv_catpvf(aTHX_ sv, "(byte order mark 0x%04"UVxf")", uv);
457 Perl_sv_catpvf(aTHX_ sv, "(%d byte%s, need %d, after start byte 0x%02"UVxf")",
458 expectlen, expectlen == 1 ? "": "s", UNISKIP(uv), startbyte);
461 Perl_sv_catpvf(aTHX_ sv, "(character 0x%04"UVxf")", uv);
464 Perl_sv_catpvf(aTHX_ sv, "(unknown reason)");
472 Perl_warner(aTHX_ WARN_UTF8,
473 "%s in %s", s, OP_DESC(PL_op));
475 Perl_warner(aTHX_ WARN_UTF8, "%s", s);
480 *retlen = expectlen ? expectlen : len;
486 =for apidoc A|UV|utf8_to_uvchr|U8 *s|STRLEN *retlen
488 Returns the native character value of the first character in the string C<s>
489 which is assumed to be in UTF8 encoding; C<retlen> will be set to the
490 length, in bytes, of that character.
492 If C<s> does not point to a well-formed UTF8 character, zero is
493 returned and retlen is set, if possible, to -1.
499 Perl_utf8_to_uvchr(pTHX_ U8 *s, STRLEN *retlen)
501 return Perl_utf8n_to_uvchr(aTHX_ s, UTF8_MAXLEN, retlen, 0);
505 =for apidoc A|UV|utf8_to_uvuni|U8 *s|STRLEN *retlen
507 Returns the Unicode code point of the first character in the string C<s>
508 which is assumed to be in UTF8 encoding; C<retlen> will be set to the
509 length, in bytes, of that character.
511 This function should only be used when returned UV is considered
512 an index into the Unicode semantic tables (e.g. swashes).
514 If C<s> does not point to a well-formed UTF8 character, zero is
515 returned and retlen is set, if possible, to -1.
521 Perl_utf8_to_uvuni(pTHX_ U8 *s, STRLEN *retlen)
523 /* Call the low level routine asking for checks */
524 return Perl_utf8n_to_uvuni(aTHX_ s, UTF8_MAXLEN, retlen, 0);
528 =for apidoc A|STRLEN|utf8_length|U8 *s|U8 *e
530 Return the length of the UTF-8 char encoded string C<s> in characters.
531 Stops at C<e> (inclusive). If C<e E<lt> s> or if the scan would end
532 up past C<e>, croaks.
538 Perl_utf8_length(pTHX_ U8 *s, U8 *e)
542 /* Note: cannot use UTF8_IS_...() too eagerly here since e.g.
543 * the bitops (especially ~) can create illegal UTF-8.
544 * In other words: in Perl UTF-8 is not just for Unicode. */
547 Perl_croak(aTHX_ "panic: utf8_length: unexpected end");
552 Perl_croak(aTHX_ "panic: utf8_length: unaligned end");
561 =for apidoc A|IV|utf8_distance|U8 *a|U8 *b
563 Returns the number of UTF8 characters between the UTF-8 pointers C<a>
566 WARNING: use only if you *know* that the pointers point inside the
573 Perl_utf8_distance(pTHX_ U8 *a, U8 *b)
577 /* Note: cannot use UTF8_IS_...() too eagerly here since e.g.
578 * the bitops (especially ~) can create illegal UTF-8.
579 * In other words: in Perl UTF-8 is not just for Unicode. */
586 Perl_croak(aTHX_ "panic: utf8_distance: unaligned end");
596 Perl_croak(aTHX_ "panic: utf8_distance: unaligned end");
606 =for apidoc A|U8 *|utf8_hop|U8 *s|I32 off
608 Return the UTF-8 pointer C<s> displaced by C<off> characters, either
611 WARNING: do not use the following unless you *know* C<off> is within
612 the UTF-8 data pointed to by C<s> *and* that on entry C<s> is aligned
613 on the first byte of character or just after the last byte of a character.
619 Perl_utf8_hop(pTHX_ U8 *s, I32 off)
621 /* Note: cannot use UTF8_IS_...() too eagerly here since e.g
622 * the bitops (especially ~) can create illegal UTF-8.
623 * In other words: in Perl UTF-8 is not just for Unicode. */
632 while (UTF8_IS_CONTINUATION(*s))
640 =for apidoc A|U8 *|utf8_to_bytes|U8 *s|STRLEN *len
642 Converts a string C<s> of length C<len> from UTF8 into byte encoding.
643 Unlike C<bytes_to_utf8>, this over-writes the original string, and
644 updates len to contain the new length.
645 Returns zero on failure, setting C<len> to -1.
651 Perl_utf8_to_bytes(pTHX_ U8 *s, STRLEN *len)
657 /* ensure valid UTF8 and chars < 256 before updating string */
658 for (send = s + *len; s < send; ) {
661 if (!UTF8_IS_INVARIANT(c) &&
662 (!UTF8_IS_DOWNGRADEABLE_START(c) || (s >= send)
663 || !(c = *s++) || !UTF8_IS_CONTINUATION(c))) {
672 *d++ = (U8)utf8_to_uvchr(s, &ulen);
681 =for apidoc A|U8 *|bytes_from_utf8|U8 *s|STRLEN *len|bool *is_utf8
683 Converts a string C<s> of length C<len> from UTF8 into byte encoding.
684 Unlike <utf8_to_bytes> but like C<bytes_to_utf8>, returns a pointer to
685 the newly-created string, and updates C<len> to contain the new
686 length. Returns the original string if no conversion occurs, C<len>
687 is unchanged. Do nothing if C<is_utf8> points to 0. Sets C<is_utf8> to
688 0 if C<s> is converted or contains all 7bit characters.
694 Perl_bytes_from_utf8(pTHX_ U8 *s, STRLEN *len, bool *is_utf8)
704 /* ensure valid UTF8 and chars < 256 before converting string */
705 for (send = s + *len; s < send;) {
707 if (!UTF8_IS_INVARIANT(c)) {
708 if (UTF8_IS_DOWNGRADEABLE_START(c) && s < send &&
709 (c = *s++) && UTF8_IS_CONTINUATION(c))
718 Newz(801, d, (*len) - count + 1, U8);
719 s = start; start = d;
722 if (!UTF8_IS_INVARIANT(c)) {
723 /* Then it is two-byte encoded */
724 c = UTF8_ACCUMULATE(NATIVE_TO_UTF(c), *s++);
725 c = ASCII_TO_NATIVE(c);
735 =for apidoc A|U8 *|bytes_to_utf8|U8 *s|STRLEN *len
737 Converts a string C<s> of length C<len> from ASCII into UTF8 encoding.
738 Returns a pointer to the newly-created string, and sets C<len> to
739 reflect the new length.
745 Perl_bytes_to_utf8(pTHX_ U8 *s, STRLEN *len)
752 Newz(801, d, (*len) * 2 + 1, U8);
756 UV uv = NATIVE_TO_ASCII(*s++);
757 if (UNI_IS_INVARIANT(uv))
758 *d++ = UTF_TO_NATIVE(uv);
760 *d++ = UTF8_EIGHT_BIT_HI(uv);
761 *d++ = UTF8_EIGHT_BIT_LO(uv);
770 * Convert native (big-endian) or reversed (little-endian) UTF-16 to UTF-8.
772 * Destination must be pre-extended to 3/2 source. Do not use in-place.
773 * We optimize for native, for obvious reasons. */
776 Perl_utf16_to_utf8(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
782 Perl_croak(aTHX_ "panic: utf16_to_utf8: odd bytelen");
787 UV uv = (p[0] << 8) + p[1]; /* UTF-16BE */
794 *d++ = (( uv >> 6) | 0xc0);
795 *d++ = (( uv & 0x3f) | 0x80);
798 if (uv >= 0xd800 && uv < 0xdbff) { /* surrogates */
800 if (low < 0xdc00 || low >= 0xdfff)
801 Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
802 uv = ((uv - 0xd800) << 10) + (low - 0xdc00) + 0x10000;
805 *d++ = (( uv >> 12) | 0xe0);
806 *d++ = (((uv >> 6) & 0x3f) | 0x80);
807 *d++ = (( uv & 0x3f) | 0x80);
811 *d++ = (( uv >> 18) | 0xf0);
812 *d++ = (((uv >> 12) & 0x3f) | 0x80);
813 *d++ = (((uv >> 6) & 0x3f) | 0x80);
814 *d++ = (( uv & 0x3f) | 0x80);
818 *newlen = d - dstart;
822 /* Note: this one is slightly destructive of the source. */
825 Perl_utf16_to_utf8_reversed(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
828 U8* send = s + bytelen;
835 return utf16_to_utf8(p, d, bytelen, newlen);
838 /* for now these are all defined (inefficiently) in terms of the utf8 versions */
841 Perl_is_uni_alnum(pTHX_ UV c)
843 U8 tmpbuf[UTF8_MAXLEN+1];
844 uvchr_to_utf8(tmpbuf, (UV)c);
845 return is_utf8_alnum(tmpbuf);
849 Perl_is_uni_alnumc(pTHX_ UV c)
851 U8 tmpbuf[UTF8_MAXLEN+1];
852 uvchr_to_utf8(tmpbuf, (UV)c);
853 return is_utf8_alnumc(tmpbuf);
857 Perl_is_uni_idfirst(pTHX_ UV c)
859 U8 tmpbuf[UTF8_MAXLEN+1];
860 uvchr_to_utf8(tmpbuf, (UV)c);
861 return is_utf8_idfirst(tmpbuf);
865 Perl_is_uni_alpha(pTHX_ UV c)
867 U8 tmpbuf[UTF8_MAXLEN+1];
868 uvchr_to_utf8(tmpbuf, (UV)c);
869 return is_utf8_alpha(tmpbuf);
873 Perl_is_uni_ascii(pTHX_ UV c)
875 U8 tmpbuf[UTF8_MAXLEN+1];
876 uvchr_to_utf8(tmpbuf, (UV)c);
877 return is_utf8_ascii(tmpbuf);
881 Perl_is_uni_space(pTHX_ UV c)
883 U8 tmpbuf[UTF8_MAXLEN+1];
884 uvchr_to_utf8(tmpbuf, (UV)c);
885 return is_utf8_space(tmpbuf);
889 Perl_is_uni_digit(pTHX_ UV c)
891 U8 tmpbuf[UTF8_MAXLEN+1];
892 uvchr_to_utf8(tmpbuf, (UV)c);
893 return is_utf8_digit(tmpbuf);
897 Perl_is_uni_upper(pTHX_ UV c)
899 U8 tmpbuf[UTF8_MAXLEN+1];
900 uvchr_to_utf8(tmpbuf, (UV)c);
901 return is_utf8_upper(tmpbuf);
905 Perl_is_uni_lower(pTHX_ UV c)
907 U8 tmpbuf[UTF8_MAXLEN+1];
908 uvchr_to_utf8(tmpbuf, (UV)c);
909 return is_utf8_lower(tmpbuf);
913 Perl_is_uni_cntrl(pTHX_ UV c)
915 U8 tmpbuf[UTF8_MAXLEN+1];
916 uvchr_to_utf8(tmpbuf, (UV)c);
917 return is_utf8_cntrl(tmpbuf);
921 Perl_is_uni_graph(pTHX_ UV c)
923 U8 tmpbuf[UTF8_MAXLEN+1];
924 uvchr_to_utf8(tmpbuf, (UV)c);
925 return is_utf8_graph(tmpbuf);
929 Perl_is_uni_print(pTHX_ UV c)
931 U8 tmpbuf[UTF8_MAXLEN+1];
932 uvchr_to_utf8(tmpbuf, (UV)c);
933 return is_utf8_print(tmpbuf);
937 Perl_is_uni_punct(pTHX_ UV c)
939 U8 tmpbuf[UTF8_MAXLEN+1];
940 uvchr_to_utf8(tmpbuf, (UV)c);
941 return is_utf8_punct(tmpbuf);
945 Perl_is_uni_xdigit(pTHX_ UV c)
947 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
948 uvchr_to_utf8(tmpbuf, (UV)c);
949 return is_utf8_xdigit(tmpbuf);
953 Perl_to_uni_upper(pTHX_ UV c, U8* p, STRLEN *lenp)
955 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
956 uvchr_to_utf8(tmpbuf, (UV)c);
957 return to_utf8_upper(tmpbuf, p, lenp);
961 Perl_to_uni_title(pTHX_ UV c, U8* p, STRLEN *lenp)
963 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
964 uvchr_to_utf8(tmpbuf, (UV)c);
965 return to_utf8_title(tmpbuf, p, lenp);
969 Perl_to_uni_lower(pTHX_ UV c, U8* p, STRLEN *lenp)
971 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
972 uvchr_to_utf8(tmpbuf, (UV)c);
973 return to_utf8_lower(tmpbuf, p, lenp);
977 Perl_to_uni_fold(pTHX_ UV c, U8* p, STRLEN *lenp)
979 U8 tmpbuf[UTF8_MAXLEN_FOLD+1];
980 uvchr_to_utf8(tmpbuf, (UV)c);
981 return to_utf8_fold(tmpbuf, p, lenp);
984 /* for now these all assume no locale info available for Unicode > 255 */
987 Perl_is_uni_alnum_lc(pTHX_ UV c)
989 return is_uni_alnum(c); /* XXX no locale support yet */
993 Perl_is_uni_alnumc_lc(pTHX_ UV c)
995 return is_uni_alnumc(c); /* XXX no locale support yet */
999 Perl_is_uni_idfirst_lc(pTHX_ UV c)
1001 return is_uni_idfirst(c); /* XXX no locale support yet */
1005 Perl_is_uni_alpha_lc(pTHX_ UV c)
1007 return is_uni_alpha(c); /* XXX no locale support yet */
1011 Perl_is_uni_ascii_lc(pTHX_ UV c)
1013 return is_uni_ascii(c); /* XXX no locale support yet */
1017 Perl_is_uni_space_lc(pTHX_ UV c)
1019 return is_uni_space(c); /* XXX no locale support yet */
1023 Perl_is_uni_digit_lc(pTHX_ UV c)
1025 return is_uni_digit(c); /* XXX no locale support yet */
1029 Perl_is_uni_upper_lc(pTHX_ UV c)
1031 return is_uni_upper(c); /* XXX no locale support yet */
1035 Perl_is_uni_lower_lc(pTHX_ UV c)
1037 return is_uni_lower(c); /* XXX no locale support yet */
1041 Perl_is_uni_cntrl_lc(pTHX_ UV c)
1043 return is_uni_cntrl(c); /* XXX no locale support yet */
1047 Perl_is_uni_graph_lc(pTHX_ UV c)
1049 return is_uni_graph(c); /* XXX no locale support yet */
1053 Perl_is_uni_print_lc(pTHX_ UV c)
1055 return is_uni_print(c); /* XXX no locale support yet */
1059 Perl_is_uni_punct_lc(pTHX_ UV c)
1061 return is_uni_punct(c); /* XXX no locale support yet */
1065 Perl_is_uni_xdigit_lc(pTHX_ UV c)
1067 return is_uni_xdigit(c); /* XXX no locale support yet */
1071 Perl_to_uni_upper_lc(pTHX_ U32 c)
1073 /* XXX returns only the first character -- do not use XXX */
1074 /* XXX no locale support yet */
1076 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
1077 return (U32)to_uni_upper(c, tmpbuf, &len);
1081 Perl_to_uni_title_lc(pTHX_ U32 c)
1083 /* XXX returns only the first character XXX -- do not use XXX */
1084 /* XXX no locale support yet */
1086 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
1087 return (U32)to_uni_title(c, tmpbuf, &len);
1091 Perl_to_uni_lower_lc(pTHX_ U32 c)
1093 /* XXX returns only the first character -- do not use XXX */
1094 /* XXX no locale support yet */
1096 U8 tmpbuf[UTF8_MAXLEN_UCLC+1];
1097 return (U32)to_uni_lower(c, tmpbuf, &len);
1101 Perl_is_utf8_alnum(pTHX_ U8 *p)
1103 if (!is_utf8_char(p))
1106 /* NOTE: "IsWord", not "IsAlnum", since Alnum is a true
1107 * descendant of isalnum(3), in other words, it doesn't
1108 * contain the '_'. --jhi */
1109 PL_utf8_alnum = swash_init("utf8", "IsWord", &PL_sv_undef, 0, 0);
1110 return swash_fetch(PL_utf8_alnum, p, TRUE);
1111 /* return *p == '_' || is_utf8_alpha(p) || is_utf8_digit(p); */
1112 #ifdef SURPRISINGLY_SLOWER /* probably because alpha is usually true */
1114 PL_utf8_alnum = swash_init("utf8", "",
1115 sv_2mortal(newSVpv("+utf8::IsAlpha\n+utf8::IsDigit\n005F\n",0)), 0, 0);
1116 return swash_fetch(PL_utf8_alnum, p, TRUE);
1121 Perl_is_utf8_alnumc(pTHX_ U8 *p)
1123 if (!is_utf8_char(p))
1126 PL_utf8_alnum = swash_init("utf8", "IsAlnumC", &PL_sv_undef, 0, 0);
1127 return swash_fetch(PL_utf8_alnum, p, TRUE);
1128 /* return is_utf8_alpha(p) || is_utf8_digit(p); */
1129 #ifdef SURPRISINGLY_SLOWER /* probably because alpha is usually true */
1131 PL_utf8_alnum = swash_init("utf8", "",
1132 sv_2mortal(newSVpv("+utf8::IsAlpha\n+utf8::IsDigit\n005F\n",0)), 0, 0);
1133 return swash_fetch(PL_utf8_alnum, p, TRUE);
1138 Perl_is_utf8_idfirst(pTHX_ U8 *p)
1140 return *p == '_' || is_utf8_alpha(p);
1144 Perl_is_utf8_alpha(pTHX_ U8 *p)
1146 if (!is_utf8_char(p))
1149 PL_utf8_alpha = swash_init("utf8", "IsAlpha", &PL_sv_undef, 0, 0);
1150 return swash_fetch(PL_utf8_alpha, p, TRUE);
1154 Perl_is_utf8_ascii(pTHX_ U8 *p)
1156 if (!is_utf8_char(p))
1159 PL_utf8_ascii = swash_init("utf8", "IsAscii", &PL_sv_undef, 0, 0);
1160 return swash_fetch(PL_utf8_ascii, p, TRUE);
1164 Perl_is_utf8_space(pTHX_ U8 *p)
1166 if (!is_utf8_char(p))
1169 PL_utf8_space = swash_init("utf8", "IsSpacePerl", &PL_sv_undef, 0, 0);
1170 return swash_fetch(PL_utf8_space, p, TRUE);
1174 Perl_is_utf8_digit(pTHX_ U8 *p)
1176 if (!is_utf8_char(p))
1179 PL_utf8_digit = swash_init("utf8", "IsDigit", &PL_sv_undef, 0, 0);
1180 return swash_fetch(PL_utf8_digit, p, TRUE);
1184 Perl_is_utf8_upper(pTHX_ U8 *p)
1186 if (!is_utf8_char(p))
1189 PL_utf8_upper = swash_init("utf8", "IsUpper", &PL_sv_undef, 0, 0);
1190 return swash_fetch(PL_utf8_upper, p, TRUE);
1194 Perl_is_utf8_lower(pTHX_ U8 *p)
1196 if (!is_utf8_char(p))
1199 PL_utf8_lower = swash_init("utf8", "IsLower", &PL_sv_undef, 0, 0);
1200 return swash_fetch(PL_utf8_lower, p, TRUE);
1204 Perl_is_utf8_cntrl(pTHX_ U8 *p)
1206 if (!is_utf8_char(p))
1209 PL_utf8_cntrl = swash_init("utf8", "IsCntrl", &PL_sv_undef, 0, 0);
1210 return swash_fetch(PL_utf8_cntrl, p, TRUE);
1214 Perl_is_utf8_graph(pTHX_ U8 *p)
1216 if (!is_utf8_char(p))
1219 PL_utf8_graph = swash_init("utf8", "IsGraph", &PL_sv_undef, 0, 0);
1220 return swash_fetch(PL_utf8_graph, p, TRUE);
1224 Perl_is_utf8_print(pTHX_ U8 *p)
1226 if (!is_utf8_char(p))
1229 PL_utf8_print = swash_init("utf8", "IsPrint", &PL_sv_undef, 0, 0);
1230 return swash_fetch(PL_utf8_print, p, TRUE);
1234 Perl_is_utf8_punct(pTHX_ U8 *p)
1236 if (!is_utf8_char(p))
1239 PL_utf8_punct = swash_init("utf8", "IsPunct", &PL_sv_undef, 0, 0);
1240 return swash_fetch(PL_utf8_punct, p, TRUE);
1244 Perl_is_utf8_xdigit(pTHX_ U8 *p)
1246 if (!is_utf8_char(p))
1248 if (!PL_utf8_xdigit)
1249 PL_utf8_xdigit = swash_init("utf8", "IsXDigit", &PL_sv_undef, 0, 0);
1250 return swash_fetch(PL_utf8_xdigit, p, TRUE);
1254 Perl_is_utf8_mark(pTHX_ U8 *p)
1256 if (!is_utf8_char(p))
1259 PL_utf8_mark = swash_init("utf8", "IsM", &PL_sv_undef, 0, 0);
1260 return swash_fetch(PL_utf8_mark, p, TRUE);
1264 =for apidoc A|UV|to_utf8_case|U8 *p|U8* ustrp|STRLEN *lenp|SV **swash|char *normal|char *special
1266 The "p" contains the pointer to the UTF-8 string encoding
1267 the character that is being converted.
1269 The "ustrp" is a pointer to the character buffer to put the
1270 conversion result to. The "lenp" is a pointer to the length
1273 The "swash" is a pointer to the swash to use.
1275 The "normal" is a string like "ToLower" which means the swash
1276 $utf8::ToLower, which is stored in lib/unicore/To/Lower.pl,
1277 and loaded by SWASHGET, using lib/utf8_heavy.pl.
1279 The "special" is a string like "utf8::ToSpecLower", which means
1280 the hash %utf8::ToSpecLower, which is stored in the same file,
1281 lib/unicore/To/Lower.pl, and also loaded by SWASHGET. The access
1282 to the hash is by Perl_to_utf8_case().
1288 Perl_to_utf8_case(pTHX_ U8 *p, U8* ustrp, STRLEN *lenp, SV **swashp,char *normal, char *special)
1293 *swashp = swash_init("utf8", normal, &PL_sv_undef, 4, 0);
1294 uv = swash_fetch(*swashp, p, TRUE);
1296 uv = UNI_TO_NATIVE(uv);
1302 uv = utf8_to_uvchr(p, 0);
1304 if ((hv = get_hv(special, FALSE)) &&
1305 (keysv = sv_2mortal(Perl_newSVpvf(aTHX_ "%04"UVXf, uv))) &&
1306 (he = hv_fetch_ent(hv, keysv, FALSE, 0))) {
1307 SV *val = HeVAL(he);
1308 char *s = SvPV(val, *lenp);
1310 if (*lenp > 1 || UNI_IS_INVARIANT(c))
1311 Copy(s, ustrp, *lenp, U8);
1313 /* something in the 0x80..0xFF range */
1314 ustrp[0] = UTF8_EIGHT_BIT_HI(c);
1315 ustrp[1] = UTF8_EIGHT_BIT_LO(c);
1322 *lenp = UNISKIP(uv);
1323 uvuni_to_utf8(ustrp, uv);
1328 Perl_to_utf8_upper(pTHX_ U8 *p, U8* ustrp, STRLEN *lenp)
1330 return Perl_to_utf8_case(aTHX_ p, ustrp, lenp,
1331 &PL_utf8_toupper, "ToUpper", "utf8::ToSpecUpper");
1335 Perl_to_utf8_title(pTHX_ U8 *p, U8* ustrp, STRLEN *lenp)
1337 return Perl_to_utf8_case(aTHX_ p, ustrp, lenp,
1338 &PL_utf8_totitle, "ToTitle", "utf8::ToSpecTitle");
1342 Perl_to_utf8_lower(pTHX_ U8 *p, U8* ustrp, STRLEN *lenp)
1344 return Perl_to_utf8_case(aTHX_ p, ustrp, lenp,
1345 &PL_utf8_tolower, "ToLower", "utf8::ToSpecLower");
1349 Perl_to_utf8_fold(pTHX_ U8 *p, U8* ustrp, STRLEN *lenp)
1351 return Perl_to_utf8_case(aTHX_ p, ustrp, lenp,
1352 &PL_utf8_tofold, "ToFold", "utf8::ToSpecFold");
1355 /* a "swash" is a swatch hash */
1358 Perl_swash_init(pTHX_ char* pkg, char* name, SV *listsv, I32 minbits, I32 none)
1361 SV* tokenbufsv = sv_2mortal(NEWSV(0,0));
1363 HV *stash = gv_stashpvn(pkg, strlen(pkg), FALSE);
1366 if (!gv_fetchmeth(stash, "SWASHNEW", 8, -1)) { /* demand load utf8 */
1368 errsv_save = newSVsv(ERRSV);
1369 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpv(pkg,0), Nullsv);
1371 sv_setsv(ERRSV, errsv_save);
1372 SvREFCNT_dec(errsv_save);
1376 PUSHSTACKi(PERLSI_MAGIC);
1379 PUSHs(sv_2mortal(newSVpvn(pkg, strlen(pkg))));
1380 PUSHs(sv_2mortal(newSVpvn(name, strlen(name))));
1382 PUSHs(sv_2mortal(newSViv(minbits)));
1383 PUSHs(sv_2mortal(newSViv(none)));
1389 if (PL_curcop == &PL_compiling)
1390 /* XXX ought to be handled by lex_start */
1391 sv_setpv(tokenbufsv, PL_tokenbuf);
1392 errsv_save = newSVsv(ERRSV);
1393 if (call_method("SWASHNEW", G_SCALAR))
1394 retval = newSVsv(*PL_stack_sp--);
1396 retval = &PL_sv_undef;
1398 sv_setsv(ERRSV, errsv_save);
1399 SvREFCNT_dec(errsv_save);
1402 if (PL_curcop == &PL_compiling) {
1404 char* pv = SvPV(tokenbufsv, len);
1406 Copy(pv, PL_tokenbuf, len+1, char);
1407 PL_curcop->op_private = PL_hints;
1409 if (!SvROK(retval) || SvTYPE(SvRV(retval)) != SVt_PVHV)
1410 Perl_croak(aTHX_ "SWASHNEW didn't return an HV ref");
1415 /* This API is wrong for special case conversions since we may need to
1416 * return several Unicode characters for a single Unicode character
1417 * (see lib/unicore/SpecCase.txt) The SWASHGET in lib/utf8_heavy.pl is
1418 * the lower-level routine, and it is similarly broken for returning
1419 * multiple values. --jhi */
1421 Perl_swash_fetch(pTHX_ SV *sv, U8 *ptr, bool do_utf8)
1423 HV* hv = (HV*)SvRV(sv);
1432 UV c = NATIVE_TO_ASCII(*ptr);
1434 if (!do_utf8 && !UNI_IS_INVARIANT(c)) {
1435 tmputf8[0] = UTF8_EIGHT_BIT_HI(c);
1436 tmputf8[1] = UTF8_EIGHT_BIT_LO(c);
1439 /* Given a UTF-X encoded char 0xAA..0xYY,0xZZ
1440 * then the "swatch" is a vec() for al the chars which start
1442 * So the key in the hash (klen) is length of encoded char -1
1444 klen = UTF8SKIP(ptr) - 1;
1449 /* If char in invariant then swatch is for all the invariant chars
1450 * In both UTF-8 and UTF8-MOD that happens to be UTF_CONTINUATION_MARK
1452 needents = UTF_CONTINUATION_MARK;
1453 off = NATIVE_TO_UTF(ptr[klen]);
1457 /* If char is encoded then swatch is for the prefix */
1458 needents = (1 << UTF_ACCUMULATION_SHIFT);
1459 off = NATIVE_TO_UTF(ptr[klen]) & UTF_CONTINUATION_MASK;
1463 * This single-entry cache saves about 1/3 of the utf8 overhead in test
1464 * suite. (That is, only 7-8% overall over just a hash cache. Still,
1465 * it's nothing to sniff at.) Pity we usually come through at least
1466 * two function calls to get here...
1468 * NB: this code assumes that swatches are never modified, once generated!
1471 if (hv == PL_last_swash_hv &&
1472 klen == PL_last_swash_klen &&
1473 (!klen || memEQ((char *)ptr, (char *)PL_last_swash_key, klen)) )
1475 tmps = PL_last_swash_tmps;
1476 slen = PL_last_swash_slen;
1479 /* Try our second-level swatch cache, kept in a hash. */
1480 SV** svp = hv_fetch(hv, (char*)ptr, klen, FALSE);
1482 /* If not cached, generate it via utf8::SWASHGET */
1483 if (!svp || !SvPOK(*svp) || !(tmps = (U8*)SvPV(*svp, slen))) {
1485 /* We use utf8n_to_uvuni() as we want an index into
1486 Unicode tables, not a native character number.
1488 UV code_point = utf8n_to_uvuni(ptr, UTF8_MAXLEN, NULL, 0);
1493 PUSHSTACKi(PERLSI_MAGIC);
1497 /* On EBCDIC & ~(0xA0-1) isn't a useful thing to do */
1498 PUSHs(sv_2mortal(newSViv((klen) ?
1499 (code_point & ~(needents - 1)) : 0)));
1500 PUSHs(sv_2mortal(newSViv(needents)));
1502 errsv_save = newSVsv(ERRSV);
1503 if (call_method("SWASHGET", G_SCALAR))
1504 retval = newSVsv(*PL_stack_sp--);
1506 retval = &PL_sv_undef;
1508 sv_setsv(ERRSV, errsv_save);
1509 SvREFCNT_dec(errsv_save);
1513 if (PL_curcop == &PL_compiling)
1514 PL_curcop->op_private = PL_hints;
1516 svp = hv_store(hv, (char*)ptr, klen, retval, 0);
1518 if (!svp || !(tmps = (U8*)SvPV(*svp, slen)) || (slen << 3) < needents)
1519 Perl_croak(aTHX_ "SWASHGET didn't return result of proper length");
1522 PL_last_swash_hv = hv;
1523 PL_last_swash_klen = klen;
1524 PL_last_swash_tmps = tmps;
1525 PL_last_swash_slen = slen;
1527 Copy(ptr, PL_last_swash_key, klen, U8);
1530 switch ((int)((slen << 3) / needents)) {
1532 bit = 1 << (off & 7);
1534 return (tmps[off] & bit) != 0;
1539 return (tmps[off] << 8) + tmps[off + 1] ;
1542 return (tmps[off] << 24) + (tmps[off+1] << 16) + (tmps[off+2] << 8) + tmps[off + 3] ;
1544 Perl_croak(aTHX_ "panic: swash_fetch");
1550 =for apidoc A|U8 *|uvchr_to_utf8|U8 *d|UV uv
1552 Adds the UTF8 representation of the Native codepoint C<uv> to the end
1553 of the string C<d>; C<d> should be have at least C<UTF8_MAXLEN+1> free
1554 bytes available. The return value is the pointer to the byte after the
1555 end of the new character. In other words,
1557 d = uvchr_to_utf8(d, uv);
1559 is the recommended wide native character-aware way of saying
1566 /* On ASCII machines this is normally a macro but we want a
1567 real function in case XS code wants it
1569 #undef Perl_uvchr_to_utf8
1571 Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv)
1573 return Perl_uvuni_to_utf8_flags(aTHX_ d, NATIVE_TO_UNI(uv), 0);
1577 Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags)
1579 return Perl_uvuni_to_utf8_flags(aTHX_ d, NATIVE_TO_UNI(uv), flags);
1583 =for apidoc A|UV|utf8n_to_uvchr|U8 *s|STRLEN curlen|STRLEN *retlen|U32 flags
1585 Returns the native character value of the first character in the string C<s>
1586 which is assumed to be in UTF8 encoding; C<retlen> will be set to the
1587 length, in bytes, of that character.
1589 Allows length and flags to be passed to low level routine.
1593 /* On ASCII machines this is normally a macro but we want a
1594 real function in case XS code wants it
1596 #undef Perl_utf8n_to_uvchr
1598 Perl_utf8n_to_uvchr(pTHX_ U8 *s, STRLEN curlen, STRLEN *retlen, U32 flags)
1600 UV uv = Perl_utf8n_to_uvuni(aTHX_ s, curlen, retlen, flags);
1601 return UNI_TO_NATIVE(uv);
1605 =for apidoc A|char *|pv_uni_display|SV *dsv|U8 *spv|STRLEN len|STRLEN pvlim|UV flags
1607 Build to the scalar dsv a displayable version of the string spv,
1608 length len, the displayable version being at most pvlim bytes long
1609 (if longer, the rest is truncated and "..." will be appended).
1610 The flags argument is currently unused but available for future extensions.
1611 The pointer to the PV of the dsv is returned.
1615 Perl_pv_uni_display(pTHX_ SV *dsv, U8 *spv, STRLEN len, STRLEN pvlim, UV flags)
1620 sv_setpvn(dsv, "", 0);
1621 for (s = (char *)spv, e = s + len; s < e; s += UTF8SKIP(s)) {
1623 if (pvlim && SvCUR(dsv) >= pvlim) {
1627 u = utf8_to_uvchr((U8*)s, 0);
1628 Perl_sv_catpvf(aTHX_ dsv, "\\x{%"UVxf"}", u);
1631 sv_catpvn(dsv, "...", 3);
1637 =for apidoc A|char *|sv_uni_display|SV *dsv|SV *ssv|STRLEN pvlim|UV flags
1639 Build to the scalar dsv a displayable version of the scalar sv,
1640 he displayable version being at most pvlim bytes long
1641 (if longer, the rest is truncated and "..." will be appended).
1642 The flags argument is currently unused but available for future extensions.
1643 The pointer to the PV of the dsv is returned.
1647 Perl_sv_uni_display(pTHX_ SV *dsv, SV *ssv, STRLEN pvlim, UV flags)
1649 return Perl_pv_uni_display(aTHX_ dsv, (U8*)SvPVX(ssv), SvCUR(ssv),
1654 =for apidoc A|I32|ibcmp_utf8|const char *s1|bool u1|const char *s2|bool u2|register I32 len
1656 Return true if the strings s1 and s2 differ case-insensitively, false
1657 if not (if they are equal case-insensitively). If u1 is true, the
1658 string s1 is assumed to be in UTF-8-encoded Unicode. If u2 is true,
1659 the string s2 is assumed to be in UTF-8-encoded Unicode.
1661 For case-insensitiveness, the "casefolding" of Unicode is used
1662 instead of upper/lowercasing both the characters, see
1663 http://www.unicode.org/unicode/reports/tr21/ (Case Mappings).
1667 Perl_ibcmp_utf8(pTHX_ const char *s1, bool u1, register I32 len1, const char *s2, bool u2, register I32 len2)
1669 register U8 *a = (U8*)s1;
1670 register U8 *b = (U8*)s2;
1671 register U8 *ae = b + len1;
1672 register U8 *be = b + len2;
1675 STRLEN ulen1, ulen2;
1676 U8 tmpbuf1[UTF8_MAXLEN_FOLD+1];
1677 U8 tmpbuf2[UTF8_MAXLEN_FOLD+1];
1679 while (a < ae && b < be) {
1681 if (a + UTF8SKIP(a) > ae)
1683 ca = utf8_to_uvchr((U8*)a, &la);
1689 if (b + UTF8SKIP(b) > be)
1691 cb = utf8_to_uvchr((U8*)b, &lb);
1698 to_uni_fold(NATIVE_TO_UNI(ca), tmpbuf1, &ulen1);
1702 to_uni_fold(NATIVE_TO_UNI(cb), tmpbuf2, &ulen2);
1706 || (ulen1 == 1 && PL_fold[ca] != PL_fold[cb])
1707 || memNE((char *)tmpbuf1, (char *)tmpbuf2, ulen1))
1708 return 1; /* mismatch */
1713 return a == ae && b == be ? 0 : 1; /* 0 match, 1 mismatch */