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22#include <linux/types.h>
23#include <linux/string.h>
24#include <linux/ctype.h>
25#include <linux/module.h>
26
27#ifndef __HAVE_ARCH_STRNICMP
28
29
30
31
32
33
34int strnicmp(const char *s1, const char *s2, size_t len)
35{
36
37 unsigned char c1, c2;
38
39 if (!len)
40 return 0;
41
42 do {
43 c1 = *s1++;
44 c2 = *s2++;
45 if (!c1 || !c2)
46 break;
47 if (c1 == c2)
48 continue;
49 c1 = tolower(c1);
50 c2 = tolower(c2);
51 if (c1 != c2)
52 break;
53 } while (--len);
54 return (int)c1 - (int)c2;
55}
56EXPORT_SYMBOL(strnicmp);
57#endif
58
59#ifndef __HAVE_ARCH_STRCASECMP
60int strcasecmp(const char *s1, const char *s2)
61{
62 int c1, c2;
63
64 do {
65 c1 = tolower(*s1++);
66 c2 = tolower(*s2++);
67 } while (c1 == c2 && c1 != 0);
68 return c1 - c2;
69}
70EXPORT_SYMBOL(strcasecmp);
71#endif
72
73#ifndef __HAVE_ARCH_STRNCASECMP
74int strncasecmp(const char *s1, const char *s2, size_t n)
75{
76 int c1, c2;
77
78 do {
79 c1 = tolower(*s1++);
80 c2 = tolower(*s2++);
81 } while ((--n > 0) && c1 == c2 && c1 != 0);
82 return c1 - c2;
83}
84EXPORT_SYMBOL(strncasecmp);
85#endif
86
87#ifndef __HAVE_ARCH_STRCPY
88
89
90
91
92
93#undef strcpy
94char *strcpy(char *dest, const char *src)
95{
96 char *tmp = dest;
97
98 while ((*dest++ = *src++) != '\0')
99 ;
100 return tmp;
101}
102EXPORT_SYMBOL(strcpy);
103#endif
104
105#ifndef __HAVE_ARCH_STRNCPY
106
107
108
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111
112
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114
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117
118
119char *strncpy(char *dest, const char *src, size_t count)
120{
121 char *tmp = dest;
122
123 while (count) {
124 if ((*tmp = *src) != 0)
125 src++;
126 tmp++;
127 count--;
128 }
129 return dest;
130}
131EXPORT_SYMBOL(strncpy);
132#endif
133
134#ifndef __HAVE_ARCH_STRLCPY
135
136
137
138
139
140
141
142
143
144
145
146size_t strlcpy(char *dest, const char *src, size_t size)
147{
148 size_t ret = strlen(src);
149
150 if (size) {
151 size_t len = (ret >= size) ? size - 1 : ret;
152 memcpy(dest, src, len);
153 dest[len] = '\0';
154 }
155 return ret;
156}
157EXPORT_SYMBOL(strlcpy);
158#endif
159
160#ifndef __HAVE_ARCH_STRCAT
161
162
163
164
165
166#undef strcat
167char *strcat(char *dest, const char *src)
168{
169 char *tmp = dest;
170
171 while (*dest)
172 dest++;
173 while ((*dest++ = *src++) != '\0')
174 ;
175 return tmp;
176}
177EXPORT_SYMBOL(strcat);
178#endif
179
180#ifndef __HAVE_ARCH_STRNCAT
181
182
183
184
185
186
187
188
189
190char *strncat(char *dest, const char *src, size_t count)
191{
192 char *tmp = dest;
193
194 if (count) {
195 while (*dest)
196 dest++;
197 while ((*dest++ = *src++) != 0) {
198 if (--count == 0) {
199 *dest = '\0';
200 break;
201 }
202 }
203 }
204 return tmp;
205}
206EXPORT_SYMBOL(strncat);
207#endif
208
209#ifndef __HAVE_ARCH_STRLCAT
210
211
212
213
214
215
216size_t strlcat(char *dest, const char *src, size_t count)
217{
218 size_t dsize = strlen(dest);
219 size_t len = strlen(src);
220 size_t res = dsize + len;
221
222
223 BUG_ON(dsize >= count);
224
225 dest += dsize;
226 count -= dsize;
227 if (len >= count)
228 len = count-1;
229 memcpy(dest, src, len);
230 dest[len] = 0;
231 return res;
232}
233EXPORT_SYMBOL(strlcat);
234#endif
235
236#ifndef __HAVE_ARCH_STRCMP
237
238
239
240
241
242#undef strcmp
243int strcmp(const char *cs, const char *ct)
244{
245 unsigned char c1, c2;
246
247 while (1) {
248 c1 = *cs++;
249 c2 = *ct++;
250 if (c1 != c2)
251 return c1 < c2 ? -1 : 1;
252 if (!c1)
253 break;
254 }
255 return 0;
256}
257EXPORT_SYMBOL(strcmp);
258#endif
259
260#ifndef __HAVE_ARCH_STRNCMP
261
262
263
264
265
266
267int strncmp(const char *cs, const char *ct, size_t count)
268{
269 unsigned char c1, c2;
270
271 while (count) {
272 c1 = *cs++;
273 c2 = *ct++;
274 if (c1 != c2)
275 return c1 < c2 ? -1 : 1;
276 if (!c1)
277 break;
278 count--;
279 }
280 return 0;
281}
282EXPORT_SYMBOL(strncmp);
283#endif
284
285#ifndef __HAVE_ARCH_STRCHR
286
287
288
289
290
291char *strchr(const char *s, int c)
292{
293 for (; *s != (char)c; ++s)
294 if (*s == '\0')
295 return NULL;
296 return (char *)s;
297}
298EXPORT_SYMBOL(strchr);
299#endif
300
301#ifndef __HAVE_ARCH_STRRCHR
302
303
304
305
306
307char *strrchr(const char *s, int c)
308{
309 const char *p = s + strlen(s);
310 do {
311 if (*p == (char)c)
312 return (char *)p;
313 } while (--p >= s);
314 return NULL;
315}
316EXPORT_SYMBOL(strrchr);
317#endif
318
319#ifndef __HAVE_ARCH_STRNCHR
320
321
322
323
324
325
326char *strnchr(const char *s, size_t count, int c)
327{
328 for (; count-- && *s != '\0'; ++s)
329 if (*s == (char)c)
330 return (char *)s;
331 return NULL;
332}
333EXPORT_SYMBOL(strnchr);
334#endif
335
336
337
338
339
340
341
342char *skip_spaces(const char *str)
343{
344 while (isspace(*str))
345 ++str;
346 return (char *)str;
347}
348EXPORT_SYMBOL(skip_spaces);
349
350
351
352
353
354
355
356
357
358char *strim(char *s)
359{
360 size_t size;
361 char *end;
362
363 s = skip_spaces(s);
364 size = strlen(s);
365 if (!size)
366 return s;
367
368 end = s + size - 1;
369 while (end >= s && isspace(*end))
370 end--;
371 *(end + 1) = '\0';
372
373 return s;
374}
375EXPORT_SYMBOL(strim);
376
377#ifndef __HAVE_ARCH_STRLEN
378
379
380
381
382size_t strlen(const char *s)
383{
384 const char *sc;
385
386 for (sc = s; *sc != '\0'; ++sc)
387 ;
388 return sc - s;
389}
390EXPORT_SYMBOL(strlen);
391#endif
392
393#ifndef __HAVE_ARCH_STRNLEN
394
395
396
397
398
399size_t strnlen(const char *s, size_t count)
400{
401 const char *sc;
402
403 for (sc = s; count-- && *sc != '\0'; ++sc)
404 ;
405 return sc - s;
406}
407EXPORT_SYMBOL(strnlen);
408#endif
409
410#ifndef __HAVE_ARCH_STRSPN
411
412
413
414
415
416size_t strspn(const char *s, const char *accept)
417{
418 const char *p;
419 const char *a;
420 size_t count = 0;
421
422 for (p = s; *p != '\0'; ++p) {
423 for (a = accept; *a != '\0'; ++a) {
424 if (*p == *a)
425 break;
426 }
427 if (*a == '\0')
428 return count;
429 ++count;
430 }
431 return count;
432}
433
434EXPORT_SYMBOL(strspn);
435#endif
436
437#ifndef __HAVE_ARCH_STRCSPN
438
439
440
441
442
443size_t strcspn(const char *s, const char *reject)
444{
445 const char *p;
446 const char *r;
447 size_t count = 0;
448
449 for (p = s; *p != '\0'; ++p) {
450 for (r = reject; *r != '\0'; ++r) {
451 if (*p == *r)
452 return count;
453 }
454 ++count;
455 }
456 return count;
457}
458EXPORT_SYMBOL(strcspn);
459#endif
460
461#ifndef __HAVE_ARCH_STRPBRK
462
463
464
465
466
467char *strpbrk(const char *cs, const char *ct)
468{
469 const char *sc1, *sc2;
470
471 for (sc1 = cs; *sc1 != '\0'; ++sc1) {
472 for (sc2 = ct; *sc2 != '\0'; ++sc2) {
473 if (*sc1 == *sc2)
474 return (char *)sc1;
475 }
476 }
477 return NULL;
478}
479EXPORT_SYMBOL(strpbrk);
480#endif
481
482#ifndef __HAVE_ARCH_STRSEP
483
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489
490
491
492
493
494char *strsep(char **s, const char *ct)
495{
496 char *sbegin = *s;
497 char *end;
498
499 if (sbegin == NULL)
500 return NULL;
501
502 end = strpbrk(sbegin, ct);
503 if (end)
504 *end++ = '\0';
505 *s = end;
506 return sbegin;
507}
508EXPORT_SYMBOL(strsep);
509#endif
510
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519
520
521bool sysfs_streq(const char *s1, const char *s2)
522{
523 while (*s1 && *s1 == *s2) {
524 s1++;
525 s2++;
526 }
527
528 if (*s1 == *s2)
529 return true;
530 if (!*s1 && *s2 == '\n' && !s2[1])
531 return true;
532 if (*s1 == '\n' && !s1[1] && !*s2)
533 return true;
534 return false;
535}
536EXPORT_SYMBOL(sysfs_streq);
537
538#ifndef __HAVE_ARCH_MEMSET
539
540
541
542
543
544
545
546
547void *memset(void *s, int c, size_t count)
548{
549 char *xs = s;
550
551 while (count--)
552 *xs++ = c;
553 return s;
554}
555EXPORT_SYMBOL(memset);
556#endif
557
558#ifndef __HAVE_ARCH_MEMCPY
559
560
561
562
563
564
565
566
567
568void *memcpy(void *dest, const void *src, size_t count)
569{
570 char *tmp = dest;
571 const char *s = src;
572
573 while (count--)
574 *tmp++ = *s++;
575 return dest;
576}
577EXPORT_SYMBOL(memcpy);
578#endif
579
580#ifndef __HAVE_ARCH_MEMMOVE
581
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583
584
585
586
587
588
589void *memmove(void *dest, const void *src, size_t count)
590{
591 char *tmp;
592 const char *s;
593
594 if (dest <= src) {
595 tmp = dest;
596 s = src;
597 while (count--)
598 *tmp++ = *s++;
599 } else {
600 tmp = dest;
601 tmp += count;
602 s = src;
603 s += count;
604 while (count--)
605 *--tmp = *--s;
606 }
607 return dest;
608}
609EXPORT_SYMBOL(memmove);
610#endif
611
612#ifndef __HAVE_ARCH_MEMCMP
613
614
615
616
617
618
619#undef memcmp
620int memcmp(const void *cs, const void *ct, size_t count)
621{
622 const unsigned char *su1, *su2;
623 int res = 0;
624
625 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
626 if ((res = *su1 - *su2) != 0)
627 break;
628 return res;
629}
630EXPORT_SYMBOL(memcmp);
631#endif
632
633#ifndef __HAVE_ARCH_MEMSCAN
634
635
636
637
638
639
640
641
642
643void *memscan(void *addr, int c, size_t size)
644{
645 unsigned char *p = addr;
646
647 while (size) {
648 if (*p == c)
649 return (void *)p;
650 p++;
651 size--;
652 }
653 return (void *)p;
654}
655EXPORT_SYMBOL(memscan);
656#endif
657
658#ifndef __HAVE_ARCH_STRSTR
659
660
661
662
663
664char *strstr(const char *s1, const char *s2)
665{
666 size_t l1, l2;
667
668 l2 = strlen(s2);
669 if (!l2)
670 return (char *)s1;
671 l1 = strlen(s1);
672 while (l1 >= l2) {
673 l1--;
674 if (!memcmp(s1, s2, l2))
675 return (char *)s1;
676 s1++;
677 }
678 return NULL;
679}
680EXPORT_SYMBOL(strstr);
681#endif
682
683#ifndef __HAVE_ARCH_STRNSTR
684
685
686
687
688
689
690char *strnstr(const char *s1, const char *s2, size_t len)
691{
692 size_t l2;
693
694 l2 = strlen(s2);
695 if (!l2)
696 return (char *)s1;
697 while (len >= l2) {
698 len--;
699 if (!memcmp(s1, s2, l2))
700 return (char *)s1;
701 s1++;
702 }
703 return NULL;
704}
705EXPORT_SYMBOL(strnstr);
706#endif
707
708#ifndef __HAVE_ARCH_MEMCHR
709
710
711
712
713
714
715
716
717
718void *memchr(const void *s, int c, size_t n)
719{
720 const unsigned char *p = s;
721 while (n-- != 0) {
722 if ((unsigned char)c == *p++) {
723 return (void *)(p - 1);
724 }
725 }
726 return NULL;
727}
728EXPORT_SYMBOL(memchr);
729#endif
730