source: vendor/gawk/3.1.5/node.c@ 3675

Last change on this file since 3675 was 3076, checked in by bird, 18 years ago

gawk 3.1.5
File size: 17.8 KB
Line 
1/*
2 * node.c -- routines for node management
3 */
4
5/*
6 * Copyright (C) 1986, 1988, 1989, 1991-2001, 2003-2005 the Free Software Foundation, Inc.
7 *
8 * This file is part of GAWK, the GNU implementation of the
9 * AWK Programming Language.
10 *
11 * GAWK is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * GAWK is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
24 */
25
26#include "awk.h"
27
28/* r_force_number --- force a value to be numeric */
29
30AWKNUM
31r_force_number(register NODE *n)
32{
33 register char *cp;
34 register char *cpend;
35 char save;
36 char *ptr;
37 unsigned int newflags;
38 extern double strtod();
39
40#ifdef GAWKDEBUG
41 if (n == NULL)
42 cant_happen();
43 if (n->type != Node_val)
44 cant_happen();
45 if (n->flags == 0)
46 cant_happen();
47 if (n->flags & NUMCUR)
48 return n->numbr;
49#endif
50
51 /* all the conditionals are an attempt to avoid the expensive strtod */
52
53 /* Note: only set NUMCUR if we actually convert some digits */
54
55 n->numbr = 0.0;
56
57 if (n->stlen == 0) {
58 if (0 && do_lint)
59 lintwarn(_("can't convert string to float"));
60 return 0.0;
61 }
62
63 cp = n->stptr;
64 if (ISALPHA(*cp)) {
65 if (0 && do_lint)
66 lintwarn(_("can't convert string to float"));
67 return 0.0;
68 }
69
70 cpend = cp + n->stlen;
71 while (cp < cpend && ISSPACE(*cp))
72 cp++;
73 if (cp == cpend || ISALPHA(*cp)) {
74 if (0 && do_lint)
75 lintwarn(_("can't convert string to float"));
76 return 0.0;
77 }
78
79 if (n->flags & MAYBE_NUM) {
80 newflags = NUMBER;
81 n->flags &= ~MAYBE_NUM;
82 } else
83 newflags = 0;
84 if (cpend - cp == 1) {
85 if (ISDIGIT(*cp)) {
86 n->numbr = (AWKNUM)(*cp - '0');
87 n->flags |= newflags;
88 n->flags |= NUMCUR;
89 } else if (0 && do_lint)
90 lintwarn(_("can't convert string to float"));
91 return n->numbr;
92 }
93
94 if (do_non_decimal_data) {
95 errno = 0;
96 if (! do_traditional && isnondecimal(cp, TRUE)) {
97 n->numbr = nondec2awknum(cp, cpend - cp);
98 n->flags |= NUMCUR;
99 goto finish;
100 }
101 }
102
103 errno = 0;
104 save = *cpend;
105 *cpend = '\0';
106 n->numbr = (AWKNUM) strtod((const char *) cp, &ptr);
107
108 /* POSIX says trailing space is OK for NUMBER */
109 while (ISSPACE(*ptr))
110 ptr++;
111 *cpend = save;
112finish:
113 /* the >= should be ==, but for SunOS 3.5 strtod() */
114 if (errno == 0 && ptr >= cpend) {
115 n->flags |= newflags;
116 n->flags |= NUMCUR;
117 } else {
118 if (0 && do_lint && ptr < cpend)
119 lintwarn(_("can't convert string to float"));
120 errno = 0;
121 }
122
123 return n->numbr;
124}
125
126/*
127 * the following lookup table is used as an optimization in force_string
128 * (more complicated) variations on this theme didn't seem to pay off, but
129 * systematic testing might be in order at some point
130 */
131static const char *const values[] = {
132 "0",
133 "1",
134 "2",
135 "3",
136 "4",
137 "5",
138 "6",
139 "7",
140 "8",
141 "9",
142};
143#define NVAL (sizeof(values)/sizeof(values[0]))
144
145/* format_val --- format a numeric value based on format */
146
147NODE *
148format_val(const char *format, int index, register NODE *s)
149{
150 char buf[BUFSIZ];
151 register char *sp = buf;
152 double val;
153 char *orig, *trans, save;
154
155 if (! do_traditional && (s->flags & INTLSTR) != 0) {
156 save = s->stptr[s->stlen];
157 s->stptr[s->stlen] = '\0';
158
159 orig = s->stptr;
160 trans = dgettext(TEXTDOMAIN, orig);
161
162 s->stptr[s->stlen] = save;
163 return tmp_string(trans, strlen(trans));
164 }
165
166 /* not an integral value, or out of range */
167 if ((val = double_to_int(s->numbr)) != s->numbr
168 || val < LONG_MIN || val > LONG_MAX) {
169 /*
170 * Once upon a time, if GFMT_WORKAROUND wasn't defined,
171 * we just blindly did this:
172 * sprintf(sp, format, s->numbr);
173 * s->stlen = strlen(sp);
174 * s->stfmt = (char) index;
175 * but that's no good if, e.g., OFMT is %s. So we punt,
176 * and just always format the value ourselves.
177 */
178
179 NODE *dummy, *r;
180 unsigned short oflags;
181 extern NODE **fmt_list; /* declared in eval.c */
182
183 /* create dummy node for a sole use of format_tree */
184 getnode(dummy);
185 dummy->type = Node_expression_list;
186 dummy->lnode = s;
187 dummy->rnode = NULL;
188 oflags = s->flags;
189 s->flags |= PERM; /* prevent from freeing by format_tree() */
190 r = format_tree(format, fmt_list[index]->stlen, dummy, 2);
191 s->flags = oflags;
192 s->stfmt = (char) index;
193 s->stlen = r->stlen;
194 if ((s->flags & STRCUR) != 0)
195 free(s->stptr);
196 s->stptr = r->stptr;
197 freenode(r); /* Do not free_temp(r)! We want */
198 freenode(dummy); /* to keep s->stptr == r->stpr. */
199
200 goto no_malloc;
201 } else {
202 /* integral value */
203 /* force conversion to long only once */
204 register long num = (long) val;
205 if (num < NVAL && num >= 0) {
206 sp = (char *) values[num];
207 s->stlen = 1;
208 } else {
209 (void) sprintf(sp, "%ld", num);
210 s->stlen = strlen(sp);
211 }
212 s->stfmt = -1;
213 }
214 emalloc(s->stptr, char *, s->stlen + 2, "format_val");
215 memcpy(s->stptr, sp, s->stlen+1);
216no_malloc:
217 s->stref = 1;
218 s->flags |= STRCUR;
219#if defined MBS_SUPPORT
220 if ((s->flags & WSTRCUR) != 0) {
221 assert(s->wstptr != NULL);
222 free(s->wstptr);
223 s->wstptr = NULL;
224 s->wstlen = 0;
225 s->flags &= ~WSTRCUR;
226 }
227#endif
228 return s;
229}
230
231/* r_force_string --- force a value to be a string */
232
233NODE *
234r_force_string(register NODE *s)
235{
236 NODE *ret;
237#ifdef GAWKDEBUG
238 if (s == NULL)
239 cant_happen();
240 if (s->type != Node_val)
241 cant_happen();
242 if (s->stref <= 0)
243 cant_happen();
244 if ((s->flags & STRCUR) != 0
245 && (s->stfmt == -1 || s->stfmt == CONVFMTidx))
246 return s;
247#endif
248
249 ret = format_val(CONVFMT, CONVFMTidx, s);
250 return ret;
251}
252
253/*
254 * dupnode:
255 * Duplicate a node. (For strings, "duplicate" means crank up the
256 * reference count.)
257 */
258
259NODE *
260r_dupnode(NODE *n)
261{
262 register NODE *r;
263
264#ifndef DUPNODE_MACRO
265 if ((n->flags & TEMP) != 0) {
266 n->flags &= ~TEMP;
267 n->flags |= MALLOC;
268 return n;
269 }
270 if ((n->flags & PERM) != 0)
271 return n;
272#endif
273 if ((n->flags & (MALLOC|STRCUR)) == (MALLOC|STRCUR)) {
274 if (n->stref < LONG_MAX)
275 n->stref++;
276 else
277 n->flags |= PERM;
278 return n;
279 } else if ((n->flags & MALLOC) != 0 && n->type == Node_ahash) {
280 if (n->ahname_ref < LONG_MAX)
281 n->ahname_ref++;
282 else
283 n->flags |= PERM;
284 return n;
285 }
286 getnode(r);
287 *r = *n;
288 r->flags &= ~(PERM|TEMP|FIELD);
289 r->flags |= MALLOC;
290#if defined MBS_SUPPORT
291 r->wstptr = NULL;
292#endif /* defined MBS_SUPPORT */
293 if (n->type == Node_val && (n->flags & STRCUR) != 0) {
294 r->stref = 1;
295 emalloc(r->stptr, char *, r->stlen + 2, "dupnode");
296 memcpy(r->stptr, n->stptr, r->stlen);
297 r->stptr[r->stlen] = '\0';
298#if defined MBS_SUPPORT
299 if ((n->flags & WSTRCUR) != 0) {
300 r->wstlen = n->wstlen;
301 emalloc(r->wstptr, wchar_t *, sizeof(wchar_t) * (r->wstlen + 2), "dupnode");
302 memcpy(r->wstptr, n->wstptr, r->wstlen * sizeof(wchar_t));
303 r->wstptr[r->wstlen] = L'\0';
304 r->flags |= WSTRCUR;
305 }
306#endif /* defined MBS_SUPPORT */
307 } else if (n->type == Node_ahash && (n->flags & MALLOC) != 0) {
308 r->ahname_ref = 1;
309 emalloc(r->ahname_str, char *, r->ahname_len + 2, "dupnode");
310 memcpy(r->ahname_str, n->ahname_str, r->ahname_len);
311 r->ahname_str[r->ahname_len] = '\0';
312 }
313 return r;
314}
315
316/* copy_node --- force a brand new copy of a node to be allocated */
317
318NODE *
319copynode(NODE *old)
320{
321 NODE *new;
322 int saveflags;
323
324 assert(old != NULL);
325 saveflags = old->flags;
326 old->flags &= ~(MALLOC|PERM);
327 new = dupnode(old);
328 old->flags = saveflags;
329 return new;
330}
331
332/* mk_number --- allocate a node with defined number */
333
334NODE *
335mk_number(AWKNUM x, unsigned int flags)
336{
337 register NODE *r;
338
339 getnode(r);
340 r->type = Node_val;
341 r->numbr = x;
342 r->flags = flags;
343#ifdef GAWKDEBUG
344 r->stref = 1;
345 r->stptr = NULL;
346 r->stlen = 0;
347#if defined MBS_SUPPORT
348 r->wstptr = NULL;
349 r->wstlen = 0;
350 r->flags &= ~WSTRCUR;
351#endif /* MBS_SUPPORT */
352#endif /* GAWKDEBUG */
353 return r;
354}
355
356/* make_str_node --- make a string node */
357
358NODE *
359make_str_node(char *s, unsigned long len, int flags)
360{
361 register NODE *r;
362
363 getnode(r);
364 r->type = Node_val;
365 r->flags = (STRING|STRCUR|MALLOC);
366#if defined MBS_SUPPORT
367 r->wstptr = NULL;
368 r->wstlen = 0;
369#endif
370 if (flags & ALREADY_MALLOCED)
371 r->stptr = s;
372 else {
373 emalloc(r->stptr, char *, len + 2, s);
374 memcpy(r->stptr, s, len);
375 }
376 r->stptr[len] = '\0';
377
378 if ((flags & SCAN) != 0) { /* scan for escape sequences */
379 const char *pf;
380 register char *ptm;
381 register int c;
382 register const char *end;
383#ifdef MBS_SUPPORT
384 mbstate_t cur_state;
385
386 memset(& cur_state, 0, sizeof(cur_state));
387#endif
388
389 end = &(r->stptr[len]);
390 for (pf = ptm = r->stptr; pf < end;) {
391#ifdef MBS_SUPPORT
392 /*
393 * Keep multibyte characters together. This avoids
394 * problems if a subsequent byte of a multibyte
395 * character happens to be a backslash.
396 */
397 if (gawk_mb_cur_max > 1) {
398 int mblen = mbrlen(pf, end-pf, &cur_state);
399
400 if (mblen > 1) {
401 int i;
402
403 for (i = 0; i < mblen; i++)
404 *ptm++ = *pf++;
405 continue;
406 }
407 }
408#endif
409 c = *pf++;
410 if (c == '\\') {
411 c = parse_escape(&pf);
412 if (c < 0) {
413 if (do_lint)
414 lintwarn(_("backslash at end of string"));
415 c = '\\';
416 }
417 *ptm++ = c;
418 } else
419 *ptm++ = c;
420 }
421 len = ptm - r->stptr;
422 erealloc(r->stptr, char *, len + 1, "make_str_node");
423 r->stptr[len] = '\0';
424 r->flags |= PERM;
425 }
426 r->stlen = len;
427 r->stref = 1;
428 r->stfmt = -1;
429
430 return r;
431}
432
433/* tmp_string --- allocate a temporary string */
434
435NODE *
436tmp_string(char *s, size_t len)
437{
438 register NODE *r;
439
440 r = make_string(s, len);
441 r->flags |= TEMP;
442 return r;
443}
444
445/* more_nodes --- allocate more nodes */
446
447#define NODECHUNK 100
448
449NODE *nextfree = NULL;
450
451NODE *
452more_nodes()
453{
454 register NODE *np;
455
456 /* get more nodes and initialize list */
457 emalloc(nextfree, NODE *, NODECHUNK * sizeof(NODE), "more_nodes");
458 memset(nextfree, 0, NODECHUNK * sizeof(NODE));
459 for (np = nextfree; np <= &nextfree[NODECHUNK - 1]; np++) {
460 np->nextp = np + 1;
461 }
462 --np;
463 np->nextp = NULL;
464 np = nextfree;
465 nextfree = nextfree->nextp;
466 return np;
467}
468
469#ifdef MEMDEBUG
470#undef freenode
471/* freenode --- release a node back to the pool */
472
473void
474freenode(NODE *it)
475{
476#ifdef MPROF
477 it->stref = 0;
478 free((char *) it);
479#else /* not MPROF */
480#ifndef NO_PROFILING
481 it->exec_count = 0;
482#endif
483 /* add it to head of freelist */
484 it->nextp = nextfree;
485 nextfree = it;
486#endif /* not MPROF */
487}
488#endif /* GAWKDEBUG */
489
490/* unref --- remove reference to a particular node */
491
492void
493unref(register NODE *tmp)
494{
495 if (tmp == NULL)
496 return;
497 if ((tmp->flags & PERM) != 0)
498 return;
499 tmp->flags &= ~TEMP;
500 if ((tmp->flags & MALLOC) != 0) {
501 if (tmp->type == Node_ahash) {
502 if (tmp->ahname_ref > 1) {
503 tmp->ahname_ref--;
504 return;
505 }
506 free(tmp->ahname_str);
507 } else if ((tmp->flags & STRCUR) != 0) {
508 if (tmp->stref > 1) {
509 tmp->stref--;
510 return;
511 }
512 free(tmp->stptr);
513#if defined MBS_SUPPORT
514 if (tmp->wstptr != NULL) {
515 assert((tmp->flags & WSTRCUR) != 0);
516 free(tmp->wstptr);
517 }
518 tmp->flags &= ~WSTRCUR;
519 tmp->wstptr = NULL;
520 tmp->wstlen = 0;
521#endif
522 }
523 freenode(tmp);
524 return;
525 }
526 if ((tmp->flags & FIELD) != 0) {
527 freenode(tmp);
528 return;
529 }
530}
531
532/*
533 * parse_escape:
534 *
535 * Parse a C escape sequence. STRING_PTR points to a variable containing a
536 * pointer to the string to parse. That pointer is updated past the
537 * characters we use. The value of the escape sequence is returned.
538 *
539 * A negative value means the sequence \ newline was seen, which is supposed to
540 * be equivalent to nothing at all.
541 *
542 * If \ is followed by a null character, we return a negative value and leave
543 * the string pointer pointing at the null character.
544 *
545 * If \ is followed by 000, we return 0 and leave the string pointer after the
546 * zeros. A value of 0 does not mean end of string.
547 *
548 * Posix doesn't allow \x.
549 */
550
551int
552parse_escape(const char **string_ptr)
553{
554 register int c = *(*string_ptr)++;
555 register int i;
556 register int count;
557
558 switch (c) {
559 case 'a':
560 return BELL;
561 case 'b':
562 return '\b';
563 case 'f':
564 return '\f';
565 case 'n':
566 return '\n';
567 case 'r':
568 return '\r';
569 case 't':
570 return '\t';
571 case 'v':
572 return '\v';
573 case '\n':
574 return -2;
575 case 0:
576 (*string_ptr)--;
577 return -1;
578 case '0':
579 case '1':
580 case '2':
581 case '3':
582 case '4':
583 case '5':
584 case '6':
585 case '7':
586 i = c - '0';
587 count = 0;
588 while (++count < 3) {
589 if ((c = *(*string_ptr)++) >= '0' && c <= '7') {
590 i *= 8;
591 i += c - '0';
592 } else {
593 (*string_ptr)--;
594 break;
595 }
596 }
597 return i;
598 case 'x':
599 if (do_lint) {
600 static int didwarn = FALSE;
601
602 if (! didwarn) {
603 didwarn = TRUE;
604 lintwarn(_("POSIX does not allow `\\x' escapes"));
605 }
606 }
607 if (do_posix)
608 return ('x');
609 if (! ISXDIGIT((*string_ptr)[0])) {
610 warning(_("no hex digits in `\\x' escape sequence"));
611 return ('x');
612 }
613 i = 0;
614 for (;;) {
615 /* do outside test to avoid multiple side effects */
616 c = *(*string_ptr)++;
617 if (ISXDIGIT(c)) {
618 i *= 16;
619 if (ISDIGIT(c))
620 i += c - '0';
621 else if (ISUPPER(c))
622 i += c - 'A' + 10;
623 else
624 i += c - 'a' + 10;
625 } else {
626 (*string_ptr)--;
627 break;
628 }
629 }
630 return i;
631 case '\\':
632 case '"':
633 return c;
634 default:
635 {
636 static short warned[256];
637 unsigned char uc = (unsigned char) c;
638
639 /* N.B.: use unsigned char here to avoid Latin-1 problems */
640
641 if (! warned[uc]) {
642 warned[uc] = TRUE;
643
644 warning(_("escape sequence `\\%c' treated as plain `%c'"), uc, uc);
645 }
646 }
647 return c;
648 }
649}
650
651/* isnondecimal --- return true if number is not a decimal number */
652
653int
654isnondecimal(const char *str, int use_locale)
655{
656 int dec_point = '.';
657#if defined(HAVE_LOCALE_H)
658 /*
659 * loc.decimal_point may not have been initialized yet,
660 * so double check it before using it.
661 */
662 if (use_locale && loc.decimal_point != NULL && loc.decimal_point[0] != '\0')
663 dec_point = loc.decimal_point[0]; /* XXX --- assumes one char */
664#endif
665
666 if (str[0] != '0')
667 return FALSE;
668
669 /* leading 0x or 0X */
670 if (str[1] == 'x' || str[1] == 'X')
671 return TRUE;
672
673 /*
674 * Numbers with '.', 'e', or 'E' are decimal.
675 * Have to check so that things like 00.34 are handled right.
676 *
677 * These beasts can have trailing whitespace. Deal with that too.
678 */
679 for (; *str != '\0'; str++) {
680 if (*str == 'e' || *str == 'E' || *str == dec_point)
681 return FALSE;
682 else if (! ISDIGIT(*str))
683 break;
684 }
685
686 return TRUE;
687}
688
689#if defined MBS_SUPPORT
690/* str2wstr --- convert a multibyte string to a wide string */
691
692NODE *
693str2wstr(NODE *n, size_t **ptr)
694{
695 size_t i, count, src_count;
696 char *sp;
697 mbstate_t mbs;
698 wchar_t wc, *wsp;
699
700 assert((n->flags & (STRING|STRCUR)) != 0);
701
702 if ((n->flags & WSTRCUR) != 0) {
703 if (ptr == NULL)
704 return n;
705 /* otherwise
706 fall through and recompute to fill in the array */
707 }
708
709 if (n->wstptr != NULL) {
710 free(n->wstptr);
711 n->wstptr = NULL;
712 n->wstlen = 0;
713 }
714
715 /*
716 * After consideration and consultation, this
717 * code trades space for time. We allocate
718 * an array of wchar_t that is n->stlen long.
719 * This is needed in the worst case anyway, where
720 * each input bytes maps to one wchar_t. The
721 * advantage is that we only have to convert the string
722 * once, instead of twice, once to find out how many
723 * wide characters, and then again to actually fill
724 * the info in. If there's a lot left over, we can
725 * realloc the wide string down in size.
726 */
727
728 emalloc(n->wstptr, wchar_t *, sizeof(wchar_t) * (n->stlen + 2), "str2wstr");
729 wsp = n->wstptr;
730
731 /*
732 * For use by do_match, create and fill in an array.
733 * For each byte `i' in n->stptr (the original string),
734 * a[i] is equal to `j', where `j' is the corresponding wchar_t
735 * in the converted wide string.
736 *
737 * Create the array.
738 */
739 if (ptr != NULL) {
740 emalloc(*ptr, size_t *, sizeof(size_t) * n->stlen, "str2wstr");
741 memset(*ptr, 0, sizeof(size_t) * n->stlen);
742 }
743
744 sp = n->stptr;
745 src_count = n->stlen;
746 memset(& mbs, 0, sizeof(mbs));
747 for (i = 0; src_count > 0; i++) {
748 count = mbrtowc(& wc, sp, src_count, & mbs);
749 switch (count) {
750 case (size_t) -2:
751 case (size_t) -1:
752 case 0:
753 goto done;
754
755 default:
756 *wsp++ = wc;
757 src_count -= count;
758 while (count--) {
759 if (ptr != NULL)
760 (*ptr)[sp - n->stptr] = i;
761 sp++;
762 }
763 break;
764 }
765 }
766
767done:
768 *wsp = L'\0';
769 n->wstlen = i;
770 n->flags |= WSTRCUR;
771#define ARBITRARY_AMOUNT_TO_GIVE_BACK 100
772 if (n->stlen - n->wstlen > ARBITRARY_AMOUNT_TO_GIVE_BACK)
773 erealloc(n->wstptr, wchar_t *, sizeof(wchar_t) * (n->wstlen + 2), "str2wstr");
774
775 return n;
776}
777
778#if 0
779static void
780dump_wstr(FILE *fp, const wchar_t *str, size_t len)
781{
782 if (str == NULL || len == 0)
783 return;
784
785 for (; len--; str++)
786 putc((int) *str, fp);
787}
788#endif
789
790/* wstrstr --- walk haystack, looking for needle, wide char version */
791
792const wchar_t *
793wstrstr(const wchar_t *haystack, size_t hs_len,
794 const wchar_t *needle, size_t needle_len)
795{
796 size_t i;
797
798 if (haystack == NULL || needle == NULL || needle_len > hs_len)
799 return NULL;
800
801 for (i = 0; i < hs_len; i++) {
802 if (haystack[i] == needle[0]
803 && i+needle_len-1 < hs_len
804 && haystack[i+needle_len-1] == needle[needle_len-1]) {
805 /* first & last chars match, check string */
806 if (memcmp(haystack+i, needle, sizeof(wchar_t) * needle_len) == 0) {
807 return haystack + i;
808 }
809 }
810 }
811
812 return NULL;
813}
814
815/* wcasestrstr --- walk haystack, nocase look for needle, wide char version */
816
817const wchar_t *
818wcasestrstr(const wchar_t *haystack, size_t hs_len,
819 const wchar_t *needle, size_t needle_len)
820{
821 size_t i, j;
822
823 if (haystack == NULL || needle == NULL || needle_len > hs_len)
824 return NULL;
825
826 for (i = 0; i < hs_len; i++) {
827 if (towlower(haystack[i]) == towlower(needle[0])
828 && i+needle_len-1 < hs_len
829 && towlower(haystack[i+needle_len-1]) == towlower(needle[needle_len-1])) {
830 /* first & last chars match, check string */
831 const wchar_t *start;
832
833 start = haystack+i;
834 for (j = 0; j < needle_len; j++, start++) {
835 wchar_t h, n;
836
837 h = towlower(*start);
838 n = towlower(needle[j]);
839 if (h != n)
840 goto out;
841 }
842 return haystack + i;
843 }
844out: ;
845 }
846
847 return NULL;
848}
849#endif /* defined MBS_SUPPORT */
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