4 * Copyright (C) 1991, 1992 Linus Torvalds
8 * stupid library routines.. The optimized versions should generally be found
9 * as inline code in <asm-xx/string.h>
11 * These are buggy as well..
13 * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
14 * - Added strsep() which will replace strtok() soon (because strsep() is
15 * reentrant and should be faster). Use only strsep() in new code, please.
17 * * Sat Feb 09 2002, Jason Thomas <jason@topic.com.au>,
18 * Matthew Hawkins <matt@mh.dropbear.id.au>
19 * - Kissed strtok() goodbye
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/ctype.h>
25 #include <linux/module.h>
27 #ifndef __HAVE_ARCH_STRNICMP
29 * strnicmp - Case insensitive, length-limited string comparison
31 * @s2: The other string
32 * @len: the maximum number of characters to compare
34 int strnicmp(const char *s1, const char *s2, size_t len)
36 /* Yes, Virginia, it had better be unsigned */
56 return (int)c1 - (int)c2;
59 EXPORT_SYMBOL(strnicmp);
62 #ifndef __HAVE_ARCH_STRCPY
64 * strcpy - Copy a %NUL terminated string
65 * @dest: Where to copy the string to
66 * @src: Where to copy the string from
68 char * strcpy(char * dest,const char *src)
72 while ((*dest++ = *src++) != '\0')
76 EXPORT_SYMBOL(strcpy);
79 #ifndef __HAVE_ARCH_STRNCPY
81 * strncpy - Copy a length-limited, %NUL-terminated string
82 * @dest: Where to copy the string to
83 * @src: Where to copy the string from
84 * @count: The maximum number of bytes to copy
86 * The result is not %NUL-terminated if the source exceeds
89 char * strncpy(char * dest,const char *src,size_t count)
94 if ((*tmp = *src) != 0) src++;
100 EXPORT_SYMBOL(strncpy);
103 #ifndef __HAVE_ARCH_STRLCPY
105 * strlcpy - Copy a %NUL terminated string into a sized buffer
106 * @dest: Where to copy the string to
107 * @src: Where to copy the string from
108 * @size: size of destination buffer
110 * Compatible with *BSD: the result is always a valid
111 * NUL-terminated string that fits in the buffer (unless,
112 * of course, the buffer size is zero). It does not pad
113 * out the result like strncpy() does.
115 size_t strlcpy(char *dest, const char *src, size_t size)
117 size_t ret = strlen(src);
120 size_t len = (ret >= size) ? size-1 : ret;
121 memcpy(dest, src, len);
126 EXPORT_SYMBOL(strlcpy);
129 #ifndef __HAVE_ARCH_STRCAT
131 * strcat - Append one %NUL-terminated string to another
132 * @dest: The string to be appended to
133 * @src: The string to append to it
135 char * strcat(char * dest, const char * src)
141 while ((*dest++ = *src++) != '\0')
146 EXPORT_SYMBOL(strcat);
149 #ifndef __HAVE_ARCH_STRNCAT
151 * strncat - Append a length-limited, %NUL-terminated string to another
152 * @dest: The string to be appended to
153 * @src: The string to append to it
154 * @count: The maximum numbers of bytes to copy
156 * Note that in contrast to strncpy, strncat ensures the result is
159 char * strncat(char *dest, const char *src, size_t count)
166 while ((*dest++ = *src++) != 0) {
176 EXPORT_SYMBOL(strncat);
179 #ifndef __HAVE_ARCH_STRLCAT
181 * strlcat - Append a length-limited, %NUL-terminated string to another
182 * @dest: The string to be appended to
183 * @src: The string to append to it
184 * @count: The size of the destination buffer.
186 size_t strlcat(char *dest, const char *src, size_t count)
188 size_t dsize = strlen(dest);
189 size_t len = strlen(src);
190 size_t res = dsize + len;
192 /* This would be a bug */
193 BUG_ON(dsize >= count);
199 memcpy(dest, src, len);
203 EXPORT_SYMBOL(strlcat);
206 #ifndef __HAVE_ARCH_STRCMP
208 * strcmp - Compare two strings
210 * @ct: Another string
212 int strcmp(const char * cs,const char * ct)
214 register signed char __res;
217 if ((__res = *cs - *ct++) != 0 || !*cs++)
223 EXPORT_SYMBOL(strcmp);
226 #ifndef __HAVE_ARCH_STRNCMP
228 * strncmp - Compare two length-limited strings
230 * @ct: Another string
231 * @count: The maximum number of bytes to compare
233 int strncmp(const char * cs,const char * ct,size_t count)
235 register signed char __res = 0;
238 if ((__res = *cs - *ct++) != 0 || !*cs++)
245 EXPORT_SYMBOL(strncmp);
248 #ifndef __HAVE_ARCH_STRCHR
250 * strchr - Find the first occurrence of a character in a string
251 * @s: The string to be searched
252 * @c: The character to search for
254 char * strchr(const char * s, int c)
256 for(; *s != (char) c; ++s)
261 EXPORT_SYMBOL(strchr);
264 #ifndef __HAVE_ARCH_STRRCHR
266 * strrchr - Find the last occurrence of a character in a string
267 * @s: The string to be searched
268 * @c: The character to search for
270 char * strrchr(const char * s, int c)
272 const char *p = s + strlen(s);
279 EXPORT_SYMBOL(strrchr);
282 #ifndef __HAVE_ARCH_STRNCHR
284 * strnchr - Find a character in a length limited string
285 * @s: The string to be searched
286 * @count: The number of characters to be searched
287 * @c: The character to search for
289 char *strnchr(const char *s, size_t count, int c)
291 for (; count-- && *s != '\0'; ++s)
296 EXPORT_SYMBOL(strnchr);
299 #ifndef __HAVE_ARCH_STRLEN
301 * strlen - Find the length of a string
302 * @s: The string to be sized
304 size_t strlen(const char * s)
308 for (sc = s; *sc != '\0'; ++sc)
312 EXPORT_SYMBOL(strlen);
315 #ifndef __HAVE_ARCH_STRNLEN
317 * strnlen - Find the length of a length-limited string
318 * @s: The string to be sized
319 * @count: The maximum number of bytes to search
321 size_t strnlen(const char * s, size_t count)
325 for (sc = s; count-- && *sc != '\0'; ++sc)
329 EXPORT_SYMBOL(strnlen);
332 #ifndef __HAVE_ARCH_STRSPN
334 * strspn - Calculate the length of the initial substring of @s which only
335 * contain letters in @accept
336 * @s: The string to be searched
337 * @accept: The string to search for
339 size_t strspn(const char *s, const char *accept)
345 for (p = s; *p != '\0'; ++p) {
346 for (a = accept; *a != '\0'; ++a) {
358 EXPORT_SYMBOL(strspn);
362 * strcspn - Calculate the length of the initial substring of @s which does
363 * not contain letters in @reject
364 * @s: The string to be searched
365 * @reject: The string to avoid
367 size_t strcspn(const char *s, const char *reject)
373 for (p = s; *p != '\0'; ++p) {
374 for (r = reject; *r != '\0'; ++r) {
383 EXPORT_SYMBOL(strcspn);
385 #ifndef __HAVE_ARCH_STRPBRK
387 * strpbrk - Find the first occurrence of a set of characters
388 * @cs: The string to be searched
389 * @ct: The characters to search for
391 char * strpbrk(const char * cs,const char * ct)
393 const char *sc1,*sc2;
395 for( sc1 = cs; *sc1 != '\0'; ++sc1) {
396 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
403 EXPORT_SYMBOL(strpbrk);
406 #ifndef __HAVE_ARCH_STRSEP
408 * strsep - Split a string into tokens
409 * @s: The string to be searched
410 * @ct: The characters to search for
412 * strsep() updates @s to point after the token, ready for the next call.
414 * It returns empty tokens, too, behaving exactly like the libc function
415 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
416 * Same semantics, slimmer shape. ;)
418 char * strsep(char **s, const char *ct)
420 char *sbegin = *s, *end;
425 end = strpbrk(sbegin, ct);
433 EXPORT_SYMBOL(strsep);
436 #ifndef __HAVE_ARCH_MEMSET
438 * memset - Fill a region of memory with the given value
439 * @s: Pointer to the start of the area.
440 * @c: The byte to fill the area with
441 * @count: The size of the area.
443 * Do not use memset() to access IO space, use memset_io() instead.
445 void * memset(void * s,int c,size_t count)
447 char *xs = (char *) s;
454 EXPORT_SYMBOL(memset);
457 #ifndef __HAVE_ARCH_MEMCPY
459 * memcpy - Copy one area of memory to another
460 * @dest: Where to copy to
461 * @src: Where to copy from
462 * @count: The size of the area.
464 * You should not use this function to access IO space, use memcpy_toio()
465 * or memcpy_fromio() instead.
467 void * memcpy(void * dest,const void *src,size_t count)
469 char *tmp = (char *) dest, *s = (char *) src;
476 EXPORT_SYMBOL(memcpy);
479 #ifndef __HAVE_ARCH_MEMMOVE
481 * memmove - Copy one area of memory to another
482 * @dest: Where to copy to
483 * @src: Where to copy from
484 * @count: The size of the area.
486 * Unlike memcpy(), memmove() copes with overlapping areas.
488 void * memmove(void * dest,const void *src,size_t count)
499 tmp = (char *) dest + count;
500 s = (char *) src + count;
507 EXPORT_SYMBOL(memmove);
510 #ifndef __HAVE_ARCH_MEMCMP
512 * memcmp - Compare two areas of memory
513 * @cs: One area of memory
514 * @ct: Another area of memory
515 * @count: The size of the area.
517 int memcmp(const void * cs,const void * ct,size_t count)
519 const unsigned char *su1, *su2;
522 for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
523 if ((res = *su1 - *su2) != 0)
527 EXPORT_SYMBOL(memcmp);
530 #ifndef __HAVE_ARCH_MEMSCAN
532 * memscan - Find a character in an area of memory.
533 * @addr: The memory area
534 * @c: The byte to search for
535 * @size: The size of the area.
537 * returns the address of the first occurrence of @c, or 1 byte past
538 * the area if @c is not found
540 void * memscan(void * addr, int c, size_t size)
542 unsigned char * p = (unsigned char *) addr;
552 EXPORT_SYMBOL(memscan);
555 #ifndef __HAVE_ARCH_STRSTR
557 * strstr - Find the first substring in a %NUL terminated string
558 * @s1: The string to be searched
559 * @s2: The string to search for
561 char * strstr(const char * s1,const char * s2)
571 if (!memcmp(s1,s2,l2))
577 EXPORT_SYMBOL(strstr);
580 #ifndef __HAVE_ARCH_MEMCHR
582 * memchr - Find a character in an area of memory.
583 * @s: The memory area
584 * @c: The byte to search for
585 * @n: The size of the area.
587 * returns the address of the first occurrence of @c, or %NULL
590 void *memchr(const void *s, int c, size_t n)
592 const unsigned char *p = s;
594 if ((unsigned char)c == *p++) {
595 return (void *)(p-1);
600 EXPORT_SYMBOL(memchr);