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 */
58 return (int)c1 - (int)c2;
60 EXPORT_SYMBOL(strnicmp);
63 #ifndef __HAVE_ARCH_STRCPY
65 * strcpy - Copy a %NUL terminated string
66 * @dest: Where to copy the string to
67 * @src: Where to copy the string from
70 char *strcpy(char *dest, const char *src)
74 while ((*dest++ = *src++) != '\0')
78 EXPORT_SYMBOL(strcpy);
81 #ifndef __HAVE_ARCH_STRNCPY
83 * strncpy - Copy a length-limited, %NUL-terminated string
84 * @dest: Where to copy the string to
85 * @src: Where to copy the string from
86 * @count: The maximum number of bytes to copy
88 * The result is not %NUL-terminated if the source exceeds
91 * In the case where the length of @src is less than that of
92 * count, the remainder of @dest will be padded with %NUL.
95 char *strncpy(char *dest, const char *src, size_t count)
100 if ((*tmp = *src) != 0)
107 EXPORT_SYMBOL(strncpy);
110 #ifndef __HAVE_ARCH_STRLCPY
112 * strlcpy - Copy a %NUL terminated string into a sized buffer
113 * @dest: Where to copy the string to
114 * @src: Where to copy the string from
115 * @size: size of destination buffer
117 * Compatible with *BSD: the result is always a valid
118 * NUL-terminated string that fits in the buffer (unless,
119 * of course, the buffer size is zero). It does not pad
120 * out the result like strncpy() does.
122 size_t strlcpy(char *dest, const char *src, size_t size)
124 size_t ret = strlen(src);
127 size_t len = (ret >= size) ? size - 1 : ret;
128 memcpy(dest, src, len);
133 EXPORT_SYMBOL(strlcpy);
136 #ifndef __HAVE_ARCH_STRCAT
138 * strcat - Append one %NUL-terminated string to another
139 * @dest: The string to be appended to
140 * @src: The string to append to it
143 char *strcat(char *dest, const char *src)
149 while ((*dest++ = *src++) != '\0')
154 EXPORT_SYMBOL(strcat);
157 #ifndef __HAVE_ARCH_STRNCAT
159 * strncat - Append a length-limited, %NUL-terminated string to another
160 * @dest: The string to be appended to
161 * @src: The string to append to it
162 * @count: The maximum numbers of bytes to copy
164 * Note that in contrast to strncpy, strncat ensures the result is
167 char *strncat(char *dest, const char *src, size_t count)
174 while ((*dest++ = *src++) != 0) {
183 EXPORT_SYMBOL(strncat);
186 #ifndef __HAVE_ARCH_STRLCAT
188 * strlcat - Append a length-limited, %NUL-terminated string to another
189 * @dest: The string to be appended to
190 * @src: The string to append to it
191 * @count: The size of the destination buffer.
193 size_t strlcat(char *dest, const char *src, size_t count)
195 size_t dsize = strlen(dest);
196 size_t len = strlen(src);
197 size_t res = dsize + len;
199 /* This would be a bug */
200 BUG_ON(dsize >= count);
206 memcpy(dest, src, len);
210 EXPORT_SYMBOL(strlcat);
213 #ifndef __HAVE_ARCH_STRCMP
215 * strcmp - Compare two strings
217 * @ct: Another string
220 int strcmp(const char *cs, const char *ct)
225 if ((__res = *cs - *ct++) != 0 || !*cs++)
230 EXPORT_SYMBOL(strcmp);
233 #ifndef __HAVE_ARCH_STRNCMP
235 * strncmp - Compare two length-limited strings
237 * @ct: Another string
238 * @count: The maximum number of bytes to compare
240 int strncmp(const char *cs, const char *ct, size_t count)
242 signed char __res = 0;
245 if ((__res = *cs - *ct++) != 0 || !*cs++)
251 EXPORT_SYMBOL(strncmp);
254 #ifndef __HAVE_ARCH_STRCHR
256 * strchr - Find the first occurrence of a character in a string
257 * @s: The string to be searched
258 * @c: The character to search for
260 char *strchr(const char *s, int c)
262 for (; *s != (char)c; ++s)
267 EXPORT_SYMBOL(strchr);
270 #ifndef __HAVE_ARCH_STRRCHR
272 * strrchr - Find the last occurrence of a character in a string
273 * @s: The string to be searched
274 * @c: The character to search for
276 char *strrchr(const char *s, int c)
278 const char *p = s + strlen(s);
285 EXPORT_SYMBOL(strrchr);
288 #ifndef __HAVE_ARCH_STRNCHR
290 * strnchr - Find a character in a length limited string
291 * @s: The string to be searched
292 * @count: The number of characters to be searched
293 * @c: The character to search for
295 char *strnchr(const char *s, size_t count, int c)
297 for (; count-- && *s != '\0'; ++s)
302 EXPORT_SYMBOL(strnchr);
305 #ifndef __HAVE_ARCH_STRLEN
307 * strlen - Find the length of a string
308 * @s: The string to be sized
310 size_t strlen(const char *s)
314 for (sc = s; *sc != '\0'; ++sc)
318 EXPORT_SYMBOL(strlen);
321 #ifndef __HAVE_ARCH_STRNLEN
323 * strnlen - Find the length of a length-limited string
324 * @s: The string to be sized
325 * @count: The maximum number of bytes to search
327 size_t strnlen(const char *s, size_t count)
331 for (sc = s; count-- && *sc != '\0'; ++sc)
335 EXPORT_SYMBOL(strnlen);
338 #ifndef __HAVE_ARCH_STRSPN
340 * strspn - Calculate the length of the initial substring of @s which only
341 * contain letters in @accept
342 * @s: The string to be searched
343 * @accept: The string to search for
345 size_t strspn(const char *s, const char *accept)
351 for (p = s; *p != '\0'; ++p) {
352 for (a = accept; *a != '\0'; ++a) {
363 EXPORT_SYMBOL(strspn);
367 * strcspn - Calculate the length of the initial substring of @s which does
368 * not contain letters in @reject
369 * @s: The string to be searched
370 * @reject: The string to avoid
372 size_t strcspn(const char *s, const char *reject)
378 for (p = s; *p != '\0'; ++p) {
379 for (r = reject; *r != '\0'; ++r) {
387 EXPORT_SYMBOL(strcspn);
389 #ifndef __HAVE_ARCH_STRPBRK
391 * strpbrk - Find the first occurrence of a set of characters
392 * @cs: The string to be searched
393 * @ct: The characters to search for
395 char *strpbrk(const char *cs, const char *ct)
397 const char *sc1, *sc2;
399 for (sc1 = cs; *sc1 != '\0'; ++sc1) {
400 for (sc2 = ct; *sc2 != '\0'; ++sc2) {
407 EXPORT_SYMBOL(strpbrk);
410 #ifndef __HAVE_ARCH_STRSEP
412 * strsep - Split a string into tokens
413 * @s: The string to be searched
414 * @ct: The characters to search for
416 * strsep() updates @s to point after the token, ready for the next call.
418 * It returns empty tokens, too, behaving exactly like the libc function
419 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
420 * Same semantics, slimmer shape. ;)
422 char *strsep(char **s, const char *ct)
430 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;
456 EXPORT_SYMBOL(memset);
459 #ifndef __HAVE_ARCH_MEMCPY
461 * memcpy - Copy one area of memory to another
462 * @dest: Where to copy to
463 * @src: Where to copy from
464 * @count: The size of the area.
466 * You should not use this function to access IO space, use memcpy_toio()
467 * or memcpy_fromio() instead.
469 void *memcpy(void *dest, const void *src, size_t count)
471 char *tmp = (char *)dest;
472 char *s = (char *)src;
478 EXPORT_SYMBOL(memcpy);
481 #ifndef __HAVE_ARCH_MEMMOVE
483 * memmove - Copy one area of memory to another
484 * @dest: Where to copy to
485 * @src: Where to copy from
486 * @count: The size of the area.
488 * Unlike memcpy(), memmove() copes with overlapping areas.
490 void *memmove(void *dest, const void *src, size_t count)
500 tmp = (char *)dest + count;
501 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.
518 int memcmp(const void *cs, const void *ct, size_t count)
520 const unsigned char *su1, *su2;
523 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
524 if ((res = *su1 - *su2) != 0)
528 EXPORT_SYMBOL(memcmp);
531 #ifndef __HAVE_ARCH_MEMSCAN
533 * memscan - Find a character in an area of memory.
534 * @addr: The memory area
535 * @c: The byte to search for
536 * @size: The size of the area.
538 * returns the address of the first occurrence of @c, or 1 byte past
539 * the area if @c is not found
541 void *memscan(void *addr, int c, size_t size)
543 unsigned char *p = (unsigned char *)addr;
553 EXPORT_SYMBOL(memscan);
556 #ifndef __HAVE_ARCH_STRSTR
558 * strstr - Find the first substring in a %NUL terminated string
559 * @s1: The string to be searched
560 * @s2: The string to search for
562 char *strstr(const char *s1, const char *s2)
572 if (!memcmp(s1, s2, l2))
578 EXPORT_SYMBOL(strstr);
581 #ifndef __HAVE_ARCH_MEMCHR
583 * memchr - Find a character in an area of memory.
584 * @s: The memory area
585 * @c: The byte to search for
586 * @n: The size of the area.
588 * returns the address of the first occurrence of @c, or %NULL
591 void *memchr(const void *s, int c, size_t n)
593 const unsigned char *p = s;
595 if ((unsigned char)c == *p++) {
596 return (void *)(p - 1);
601 EXPORT_SYMBOL(memchr);