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
69 char * strcpy(char * dest,const char *src)
73 while ((*dest++ = *src++) != '\0')
77 EXPORT_SYMBOL(strcpy);
80 #ifndef __HAVE_ARCH_STRNCPY
82 * strncpy - Copy a length-limited, %NUL-terminated string
83 * @dest: Where to copy the string to
84 * @src: Where to copy the string from
85 * @count: The maximum number of bytes to copy
87 * The result is not %NUL-terminated if the source exceeds
90 char * strncpy(char * dest,const char *src,size_t count)
95 if ((*tmp = *src) != 0) src++;
101 EXPORT_SYMBOL(strncpy);
104 #ifndef __HAVE_ARCH_STRLCPY
106 * strlcpy - Copy a %NUL terminated string into a sized buffer
107 * @dest: Where to copy the string to
108 * @src: Where to copy the string from
109 * @size: size of destination buffer
111 * Compatible with *BSD: the result is always a valid
112 * NUL-terminated string that fits in the buffer (unless,
113 * of course, the buffer size is zero). It does not pad
114 * out the result like strncpy() does.
116 size_t strlcpy(char *dest, const char *src, size_t size)
118 size_t ret = strlen(src);
121 size_t len = (ret >= size) ? size-1 : ret;
122 memcpy(dest, src, len);
127 EXPORT_SYMBOL(strlcpy);
130 #ifndef __HAVE_ARCH_STRCAT
132 * strcat - Append one %NUL-terminated string to another
133 * @dest: The string to be appended to
134 * @src: The string to append to it
137 char * strcat(char * dest, const char * src)
143 while ((*dest++ = *src++) != '\0')
148 EXPORT_SYMBOL(strcat);
151 #ifndef __HAVE_ARCH_STRNCAT
153 * strncat - Append a length-limited, %NUL-terminated string to another
154 * @dest: The string to be appended to
155 * @src: The string to append to it
156 * @count: The maximum numbers of bytes to copy
158 * Note that in contrast to strncpy, strncat ensures the result is
161 char * strncat(char *dest, const char *src, size_t count)
168 while ((*dest++ = *src++) != 0) {
178 EXPORT_SYMBOL(strncat);
181 #ifndef __HAVE_ARCH_STRLCAT
183 * strlcat - Append a length-limited, %NUL-terminated string to another
184 * @dest: The string to be appended to
185 * @src: The string to append to it
186 * @count: The size of the destination buffer.
188 size_t strlcat(char *dest, const char *src, size_t count)
190 size_t dsize = strlen(dest);
191 size_t len = strlen(src);
192 size_t res = dsize + len;
194 /* This would be a bug */
195 BUG_ON(dsize >= count);
201 memcpy(dest, src, len);
205 EXPORT_SYMBOL(strlcat);
208 #ifndef __HAVE_ARCH_STRCMP
210 * strcmp - Compare two strings
212 * @ct: Another string
215 int strcmp(const char * cs,const char * ct)
217 register signed char __res;
220 if ((__res = *cs - *ct++) != 0 || !*cs++)
226 EXPORT_SYMBOL(strcmp);
229 #ifndef __HAVE_ARCH_STRNCMP
231 * strncmp - Compare two length-limited strings
233 * @ct: Another string
234 * @count: The maximum number of bytes to compare
236 int strncmp(const char * cs,const char * ct,size_t count)
238 register signed char __res = 0;
241 if ((__res = *cs - *ct++) != 0 || !*cs++)
248 EXPORT_SYMBOL(strncmp);
251 #ifndef __HAVE_ARCH_STRCHR
253 * strchr - Find the first occurrence of a character in a string
254 * @s: The string to be searched
255 * @c: The character to search for
257 char * strchr(const char * s, int c)
259 for(; *s != (char) c; ++s)
264 EXPORT_SYMBOL(strchr);
267 #ifndef __HAVE_ARCH_STRRCHR
269 * strrchr - Find the last occurrence of a character in a string
270 * @s: The string to be searched
271 * @c: The character to search for
273 char * strrchr(const char * s, int c)
275 const char *p = s + strlen(s);
282 EXPORT_SYMBOL(strrchr);
285 #ifndef __HAVE_ARCH_STRNCHR
287 * strnchr - Find a character in a length limited string
288 * @s: The string to be searched
289 * @count: The number of characters to be searched
290 * @c: The character to search for
292 char *strnchr(const char *s, size_t count, int c)
294 for (; count-- && *s != '\0'; ++s)
299 EXPORT_SYMBOL(strnchr);
302 #ifndef __HAVE_ARCH_STRLEN
304 * strlen - Find the length of a string
305 * @s: The string to be sized
307 size_t strlen(const char * s)
311 for (sc = s; *sc != '\0'; ++sc)
315 EXPORT_SYMBOL(strlen);
318 #ifndef __HAVE_ARCH_STRNLEN
320 * strnlen - Find the length of a length-limited string
321 * @s: The string to be sized
322 * @count: The maximum number of bytes to search
324 size_t strnlen(const char * s, size_t count)
328 for (sc = s; count-- && *sc != '\0'; ++sc)
332 EXPORT_SYMBOL(strnlen);
335 #ifndef __HAVE_ARCH_STRSPN
337 * strspn - Calculate the length of the initial substring of @s which only
338 * contain letters in @accept
339 * @s: The string to be searched
340 * @accept: The string to search for
342 size_t strspn(const char *s, const char *accept)
348 for (p = s; *p != '\0'; ++p) {
349 for (a = accept; *a != '\0'; ++a) {
361 EXPORT_SYMBOL(strspn);
365 * strcspn - Calculate the length of the initial substring of @s which does
366 * not contain letters in @reject
367 * @s: The string to be searched
368 * @reject: The string to avoid
370 size_t strcspn(const char *s, const char *reject)
376 for (p = s; *p != '\0'; ++p) {
377 for (r = reject; *r != '\0'; ++r) {
386 EXPORT_SYMBOL(strcspn);
388 #ifndef __HAVE_ARCH_STRPBRK
390 * strpbrk - Find the first occurrence of a set of characters
391 * @cs: The string to be searched
392 * @ct: The characters to search for
394 char * strpbrk(const char * cs,const char * ct)
396 const char *sc1,*sc2;
398 for( sc1 = cs; *sc1 != '\0'; ++sc1) {
399 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
406 EXPORT_SYMBOL(strpbrk);
409 #ifndef __HAVE_ARCH_STRSEP
411 * strsep - Split a string into tokens
412 * @s: The string to be searched
413 * @ct: The characters to search for
415 * strsep() updates @s to point after the token, ready for the next call.
417 * It returns empty tokens, too, behaving exactly like the libc function
418 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
419 * Same semantics, slimmer shape. ;)
421 char * strsep(char **s, const char *ct)
423 char *sbegin = *s, *end;
428 end = strpbrk(sbegin, ct);
436 EXPORT_SYMBOL(strsep);
439 #ifndef __HAVE_ARCH_MEMSET
441 * memset - Fill a region of memory with the given value
442 * @s: Pointer to the start of the area.
443 * @c: The byte to fill the area with
444 * @count: The size of the area.
446 * Do not use memset() to access IO space, use memset_io() instead.
448 void * memset(void * s,int c,size_t count)
450 char *xs = (char *) s;
457 EXPORT_SYMBOL(memset);
460 #ifndef __HAVE_ARCH_MEMCPY
462 * memcpy - Copy one area of memory to another
463 * @dest: Where to copy to
464 * @src: Where to copy from
465 * @count: The size of the area.
467 * You should not use this function to access IO space, use memcpy_toio()
468 * or memcpy_fromio() instead.
470 void * memcpy(void * dest,const void *src,size_t count)
472 char *tmp = (char *) dest, *s = (char *) src;
479 EXPORT_SYMBOL(memcpy);
482 #ifndef __HAVE_ARCH_MEMMOVE
484 * memmove - Copy one area of memory to another
485 * @dest: Where to copy to
486 * @src: Where to copy from
487 * @count: The size of the area.
489 * Unlike memcpy(), memmove() copes with overlapping areas.
491 void * memmove(void * dest,const void *src,size_t count)
502 tmp = (char *) dest + count;
503 s = (char *) src + count;
510 EXPORT_SYMBOL(memmove);
513 #ifndef __HAVE_ARCH_MEMCMP
515 * memcmp - Compare two areas of memory
516 * @cs: One area of memory
517 * @ct: Another area of memory
518 * @count: The size of the area.
521 int memcmp(const void * cs,const void * ct,size_t count)
523 const unsigned char *su1, *su2;
526 for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
527 if ((res = *su1 - *su2) != 0)
531 EXPORT_SYMBOL(memcmp);
534 #ifndef __HAVE_ARCH_MEMSCAN
536 * memscan - Find a character in an area of memory.
537 * @addr: The memory area
538 * @c: The byte to search for
539 * @size: The size of the area.
541 * returns the address of the first occurrence of @c, or 1 byte past
542 * the area if @c is not found
544 void * memscan(void * addr, int c, size_t size)
546 unsigned char * p = (unsigned char *) addr;
556 EXPORT_SYMBOL(memscan);
559 #ifndef __HAVE_ARCH_STRSTR
561 * strstr - Find the first substring in a %NUL terminated string
562 * @s1: The string to be searched
563 * @s2: The string to search for
565 char * strstr(const char * s1,const char * s2)
575 if (!memcmp(s1,s2,l2))
581 EXPORT_SYMBOL(strstr);
584 #ifndef __HAVE_ARCH_MEMCHR
586 * memchr - Find a character in an area of memory.
587 * @s: The memory area
588 * @c: The byte to search for
589 * @n: The size of the area.
591 * returns the address of the first occurrence of @c, or %NULL
594 void *memchr(const void *s, int c, size_t n)
596 const unsigned char *p = s;
598 if ((unsigned char)c == *p++) {
599 return (void *)(p-1);
604 EXPORT_SYMBOL(memchr);