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 */
54 return (int)c1
- (int)c2
;
56 EXPORT_SYMBOL(strnicmp
);
59 #ifndef __HAVE_ARCH_STRCASECMP
60 int strcasecmp(const char *s1
, const char *s2
)
67 } while (c1
== c2
&& c1
!= 0);
70 EXPORT_SYMBOL(strcasecmp
);
73 #ifndef __HAVE_ARCH_STRNCASECMP
74 int strncasecmp(const char *s1
, const char *s2
, size_t n
)
81 } while ((--n
> 0) && c1
== c2
&& c1
!= 0);
84 EXPORT_SYMBOL(strncasecmp
);
87 #ifndef __HAVE_ARCH_STRCPY
89 * strcpy - Copy a %NUL terminated string
90 * @dest: Where to copy the string to
91 * @src: Where to copy the string from
94 char *strcpy(char *dest
, const char *src
)
98 while ((*dest
++ = *src
++) != '\0')
102 EXPORT_SYMBOL(strcpy
);
105 #ifndef __HAVE_ARCH_STRNCPY
107 * strncpy - Copy a length-limited, %NUL-terminated string
108 * @dest: Where to copy the string to
109 * @src: Where to copy the string from
110 * @count: The maximum number of bytes to copy
112 * The result is not %NUL-terminated if the source exceeds
115 * In the case where the length of @src is less than that of
116 * count, the remainder of @dest will be padded with %NUL.
119 char *strncpy(char *dest
, const char *src
, size_t count
)
124 if ((*tmp
= *src
) != 0)
131 EXPORT_SYMBOL(strncpy
);
134 #ifndef __HAVE_ARCH_STRLCPY
136 * strlcpy - Copy a %NUL terminated string into a sized buffer
137 * @dest: Where to copy the string to
138 * @src: Where to copy the string from
139 * @size: size of destination buffer
141 * Compatible with *BSD: the result is always a valid
142 * NUL-terminated string that fits in the buffer (unless,
143 * of course, the buffer size is zero). It does not pad
144 * out the result like strncpy() does.
146 size_t strlcpy(char *dest
, const char *src
, size_t size
)
148 size_t ret
= strlen(src
);
151 size_t len
= (ret
>= size
) ? size
- 1 : ret
;
152 memcpy(dest
, src
, len
);
157 EXPORT_SYMBOL(strlcpy
);
160 #ifndef __HAVE_ARCH_STRCAT
162 * strcat - Append one %NUL-terminated string to another
163 * @dest: The string to be appended to
164 * @src: The string to append to it
167 char *strcat(char *dest
, const char *src
)
173 while ((*dest
++ = *src
++) != '\0')
177 EXPORT_SYMBOL(strcat
);
180 #ifndef __HAVE_ARCH_STRNCAT
182 * strncat - Append a length-limited, %NUL-terminated string to another
183 * @dest: The string to be appended to
184 * @src: The string to append to it
185 * @count: The maximum numbers of bytes to copy
187 * Note that in contrast to strncpy(), strncat() ensures the result is
190 char *strncat(char *dest
, const char *src
, size_t count
)
197 while ((*dest
++ = *src
++) != 0) {
206 EXPORT_SYMBOL(strncat
);
209 #ifndef __HAVE_ARCH_STRLCAT
211 * strlcat - Append a length-limited, %NUL-terminated string to another
212 * @dest: The string to be appended to
213 * @src: The string to append to it
214 * @count: The size of the destination buffer.
216 size_t strlcat(char *dest
, const char *src
, size_t count
)
218 size_t dsize
= strlen(dest
);
219 size_t len
= strlen(src
);
220 size_t res
= dsize
+ len
;
222 /* This would be a bug */
223 BUG_ON(dsize
>= count
);
229 memcpy(dest
, src
, len
);
233 EXPORT_SYMBOL(strlcat
);
236 #ifndef __HAVE_ARCH_STRCMP
238 * strcmp - Compare two strings
240 * @ct: Another string
243 int strcmp(const char *cs
, const char *ct
)
245 unsigned char c1
, c2
;
251 return c1
< c2
? -1 : 1;
257 EXPORT_SYMBOL(strcmp
);
260 #ifndef __HAVE_ARCH_STRNCMP
262 * strncmp - Compare two length-limited strings
264 * @ct: Another string
265 * @count: The maximum number of bytes to compare
267 int strncmp(const char *cs
, const char *ct
, size_t count
)
269 unsigned char c1
, c2
;
275 return c1
< c2
? -1 : 1;
282 EXPORT_SYMBOL(strncmp
);
285 #ifndef __HAVE_ARCH_STRCHR
287 * strchr - Find the first occurrence of a character in a string
288 * @s: The string to be searched
289 * @c: The character to search for
291 char *strchr(const char *s
, int c
)
293 for (; *s
!= (char)c
; ++s
)
298 EXPORT_SYMBOL(strchr
);
301 #ifndef __HAVE_ARCH_STRRCHR
303 * strrchr - Find the last occurrence of a character in a string
304 * @s: The string to be searched
305 * @c: The character to search for
307 char *strrchr(const char *s
, int c
)
309 const char *p
= s
+ strlen(s
);
316 EXPORT_SYMBOL(strrchr
);
319 #ifndef __HAVE_ARCH_STRNCHR
321 * strnchr - Find a character in a length limited string
322 * @s: The string to be searched
323 * @count: The number of characters to be searched
324 * @c: The character to search for
326 char *strnchr(const char *s
, size_t count
, int c
)
328 for (; count
-- && *s
!= '\0'; ++s
)
333 EXPORT_SYMBOL(strnchr
);
337 * skip_spaces - Removes leading whitespace from @str.
338 * @str: The string to be stripped.
340 * Returns a pointer to the first non-whitespace character in @str.
342 char *skip_spaces(const char *str
)
344 while (isspace(*str
))
348 EXPORT_SYMBOL(skip_spaces
);
351 * strim - Removes leading and trailing whitespace from @s.
352 * @s: The string to be stripped.
354 * Note that the first trailing whitespace is replaced with a %NUL-terminator
355 * in the given string @s. Returns a pointer to the first non-whitespace
369 while (end
>= s
&& isspace(*end
))
375 EXPORT_SYMBOL(strim
);
377 #ifndef __HAVE_ARCH_STRLEN
379 * strlen - Find the length of a string
380 * @s: The string to be sized
382 size_t strlen(const char *s
)
386 for (sc
= s
; *sc
!= '\0'; ++sc
)
390 EXPORT_SYMBOL(strlen
);
393 #ifndef __HAVE_ARCH_STRNLEN
395 * strnlen - Find the length of a length-limited string
396 * @s: The string to be sized
397 * @count: The maximum number of bytes to search
399 size_t strnlen(const char *s
, size_t count
)
403 for (sc
= s
; count
-- && *sc
!= '\0'; ++sc
)
407 EXPORT_SYMBOL(strnlen
);
410 #ifndef __HAVE_ARCH_STRSPN
412 * strspn - Calculate the length of the initial substring of @s which only contain letters in @accept
413 * @s: The string to be searched
414 * @accept: The string to search for
416 size_t strspn(const char *s
, const char *accept
)
422 for (p
= s
; *p
!= '\0'; ++p
) {
423 for (a
= accept
; *a
!= '\0'; ++a
) {
434 EXPORT_SYMBOL(strspn
);
437 #ifndef __HAVE_ARCH_STRCSPN
439 * strcspn - Calculate the length of the initial substring of @s which does not contain letters in @reject
440 * @s: The string to be searched
441 * @reject: The string to avoid
443 size_t strcspn(const char *s
, const char *reject
)
449 for (p
= s
; *p
!= '\0'; ++p
) {
450 for (r
= reject
; *r
!= '\0'; ++r
) {
458 EXPORT_SYMBOL(strcspn
);
461 #ifndef __HAVE_ARCH_STRPBRK
463 * strpbrk - Find the first occurrence of a set of characters
464 * @cs: The string to be searched
465 * @ct: The characters to search for
467 char *strpbrk(const char *cs
, const char *ct
)
469 const char *sc1
, *sc2
;
471 for (sc1
= cs
; *sc1
!= '\0'; ++sc1
) {
472 for (sc2
= ct
; *sc2
!= '\0'; ++sc2
) {
479 EXPORT_SYMBOL(strpbrk
);
482 #ifndef __HAVE_ARCH_STRSEP
484 * strsep - Split a string into tokens
485 * @s: The string to be searched
486 * @ct: The characters to search for
488 * strsep() updates @s to point after the token, ready for the next call.
490 * It returns empty tokens, too, behaving exactly like the libc function
491 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
492 * Same semantics, slimmer shape. ;)
494 char *strsep(char **s
, const char *ct
)
502 end
= strpbrk(sbegin
, ct
);
508 EXPORT_SYMBOL(strsep
);
512 * sysfs_streq - return true if strings are equal, modulo trailing newline
514 * @s2: another string
516 * This routine returns true iff two strings are equal, treating both
517 * NUL and newline-then-NUL as equivalent string terminations. It's
518 * geared for use with sysfs input strings, which generally terminate
519 * with newlines but are compared against values without newlines.
521 bool sysfs_streq(const char *s1
, const char *s2
)
523 while (*s1
&& *s1
== *s2
) {
530 if (!*s1
&& *s2
== '\n' && !s2
[1])
532 if (*s1
== '\n' && !s1
[1] && !*s2
)
536 EXPORT_SYMBOL(sysfs_streq
);
538 #ifndef __HAVE_ARCH_MEMSET
540 * memset - Fill a region of memory with the given value
541 * @s: Pointer to the start of the area.
542 * @c: The byte to fill the area with
543 * @count: The size of the area.
545 * Do not use memset() to access IO space, use memset_io() instead.
547 void *memset(void *s
, int c
, size_t count
)
555 EXPORT_SYMBOL(memset
);
558 #ifndef __HAVE_ARCH_MEMCPY
560 * memcpy - Copy one area of memory to another
561 * @dest: Where to copy to
562 * @src: Where to copy from
563 * @count: The size of the area.
565 * You should not use this function to access IO space, use memcpy_toio()
566 * or memcpy_fromio() instead.
568 void *memcpy(void *dest
, const void *src
, size_t count
)
577 EXPORT_SYMBOL(memcpy
);
580 #ifndef __HAVE_ARCH_MEMMOVE
582 * memmove - Copy one area of memory to another
583 * @dest: Where to copy to
584 * @src: Where to copy from
585 * @count: The size of the area.
587 * Unlike memcpy(), memmove() copes with overlapping areas.
589 void *memmove(void *dest
, const void *src
, size_t count
)
609 EXPORT_SYMBOL(memmove
);
612 #ifndef __HAVE_ARCH_MEMCMP
614 * memcmp - Compare two areas of memory
615 * @cs: One area of memory
616 * @ct: Another area of memory
617 * @count: The size of the area.
620 int memcmp(const void *cs
, const void *ct
, size_t count
)
622 const unsigned char *su1
, *su2
;
625 for (su1
= cs
, su2
= ct
; 0 < count
; ++su1
, ++su2
, count
--)
626 if ((res
= *su1
- *su2
) != 0)
630 EXPORT_SYMBOL(memcmp
);
633 #ifndef __HAVE_ARCH_MEMSCAN
635 * memscan - Find a character in an area of memory.
636 * @addr: The memory area
637 * @c: The byte to search for
638 * @size: The size of the area.
640 * returns the address of the first occurrence of @c, or 1 byte past
641 * the area if @c is not found
643 void *memscan(void *addr
, int c
, size_t size
)
645 unsigned char *p
= addr
;
655 EXPORT_SYMBOL(memscan
);
658 #ifndef __HAVE_ARCH_STRSTR
660 * strstr - Find the first substring in a %NUL terminated string
661 * @s1: The string to be searched
662 * @s2: The string to search for
664 char *strstr(const char *s1
, const char *s2
)
674 if (!memcmp(s1
, s2
, l2
))
680 EXPORT_SYMBOL(strstr
);
683 #ifndef __HAVE_ARCH_STRNSTR
685 * strnstr - Find the first substring in a length-limited string
686 * @s1: The string to be searched
687 * @s2: The string to search for
688 * @len: the maximum number of characters to search
690 char *strnstr(const char *s1
, const char *s2
, size_t len
)
699 if (!memcmp(s1
, s2
, l2
))
705 EXPORT_SYMBOL(strnstr
);
708 #ifndef __HAVE_ARCH_MEMCHR
710 * memchr - Find a character in an area of memory.
711 * @s: The memory area
712 * @c: The byte to search for
713 * @n: The size of the area.
715 * returns the address of the first occurrence of @c, or %NULL
718 void *memchr(const void *s
, int c
, size_t n
)
720 const unsigned char *p
= s
;
722 if ((unsigned char)c
== *p
++) {
723 return (void *)(p
- 1);
728 EXPORT_SYMBOL(memchr
);
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