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')
153 EXPORT_SYMBOL(strcat);
156 #ifndef __HAVE_ARCH_STRNCAT
158 * strncat - Append a length-limited, %NUL-terminated string to another
159 * @dest: The string to be appended to
160 * @src: The string to append to it
161 * @count: The maximum numbers of bytes to copy
163 * Note that in contrast to strncpy, strncat ensures the result is
166 char *strncat(char *dest, const char *src, size_t count)
173 while ((*dest++ = *src++) != 0) {
182 EXPORT_SYMBOL(strncat);
185 #ifndef __HAVE_ARCH_STRLCAT
187 * strlcat - Append a length-limited, %NUL-terminated string to another
188 * @dest: The string to be appended to
189 * @src: The string to append to it
190 * @count: The size of the destination buffer.
192 size_t strlcat(char *dest, const char *src, size_t count)
194 size_t dsize = strlen(dest);
195 size_t len = strlen(src);
196 size_t res = dsize + len;
198 /* This would be a bug */
199 BUG_ON(dsize >= count);
205 memcpy(dest, src, len);
209 EXPORT_SYMBOL(strlcat);
212 #ifndef __HAVE_ARCH_STRCMP
214 * strcmp - Compare two strings
216 * @ct: Another string
219 int strcmp(const char *cs, const char *ct)
224 if ((__res = *cs - *ct++) != 0 || !*cs++)
229 EXPORT_SYMBOL(strcmp);
232 #ifndef __HAVE_ARCH_STRNCMP
234 * strncmp - Compare two length-limited strings
236 * @ct: Another string
237 * @count: The maximum number of bytes to compare
239 int strncmp(const char *cs, const char *ct, size_t count)
241 signed char __res = 0;
244 if ((__res = *cs - *ct++) != 0 || !*cs++)
250 EXPORT_SYMBOL(strncmp);
253 #ifndef __HAVE_ARCH_STRCHR
255 * strchr - Find the first occurrence of a character in a string
256 * @s: The string to be searched
257 * @c: The character to search for
259 char *strchr(const char *s, int c)
261 for (; *s != (char)c; ++s)
266 EXPORT_SYMBOL(strchr);
269 #ifndef __HAVE_ARCH_STRRCHR
271 * strrchr - Find the last occurrence of a character in a string
272 * @s: The string to be searched
273 * @c: The character to search for
275 char *strrchr(const char *s, int c)
277 const char *p = s + strlen(s);
284 EXPORT_SYMBOL(strrchr);
287 #ifndef __HAVE_ARCH_STRNCHR
289 * strnchr - Find a character in a length limited string
290 * @s: The string to be searched
291 * @count: The number of characters to be searched
292 * @c: The character to search for
294 char *strnchr(const char *s, size_t count, int c)
296 for (; count-- && *s != '\0'; ++s)
301 EXPORT_SYMBOL(strnchr);
305 * strstrip - Removes leading and trailing whitespace from @s.
306 * @s: The string to be stripped.
308 * Note that the first trailing whitespace is replaced with a %NUL-terminator
309 * in the given string @s. Returns a pointer to the first non-whitespace
312 char *strstrip(char *s)
323 while (end >= s && isspace(*end))
327 while (*s && isspace(*s))
332 EXPORT_SYMBOL(strstrip);
334 #ifndef __HAVE_ARCH_STRLEN
336 * strlen - Find the length of a string
337 * @s: The string to be sized
339 size_t strlen(const char *s)
343 for (sc = s; *sc != '\0'; ++sc)
347 EXPORT_SYMBOL(strlen);
350 #ifndef __HAVE_ARCH_STRNLEN
352 * strnlen - Find the length of a length-limited string
353 * @s: The string to be sized
354 * @count: The maximum number of bytes to search
356 size_t strnlen(const char *s, size_t count)
360 for (sc = s; count-- && *sc != '\0'; ++sc)
364 EXPORT_SYMBOL(strnlen);
367 #ifndef __HAVE_ARCH_STRSPN
369 * strspn - Calculate the length of the initial substring of @s which only
370 * contain letters in @accept
371 * @s: The string to be searched
372 * @accept: The string to search for
374 size_t strspn(const char *s, const char *accept)
380 for (p = s; *p != '\0'; ++p) {
381 for (a = accept; *a != '\0'; ++a) {
392 EXPORT_SYMBOL(strspn);
395 #ifndef __HAVE_ARCH_STRCSPN
397 * strcspn - Calculate the length of the initial substring of @s which does
398 * not contain letters in @reject
399 * @s: The string to be searched
400 * @reject: The string to avoid
402 size_t strcspn(const char *s, const char *reject)
408 for (p = s; *p != '\0'; ++p) {
409 for (r = reject; *r != '\0'; ++r) {
417 EXPORT_SYMBOL(strcspn);
420 #ifndef __HAVE_ARCH_STRPBRK
422 * strpbrk - Find the first occurrence of a set of characters
423 * @cs: The string to be searched
424 * @ct: The characters to search for
426 char *strpbrk(const char *cs, const char *ct)
428 const char *sc1, *sc2;
430 for (sc1 = cs; *sc1 != '\0'; ++sc1) {
431 for (sc2 = ct; *sc2 != '\0'; ++sc2) {
438 EXPORT_SYMBOL(strpbrk);
441 #ifndef __HAVE_ARCH_STRSEP
443 * strsep - Split a string into tokens
444 * @s: The string to be searched
445 * @ct: The characters to search for
447 * strsep() updates @s to point after the token, ready for the next call.
449 * It returns empty tokens, too, behaving exactly like the libc function
450 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
451 * Same semantics, slimmer shape. ;)
453 char *strsep(char **s, const char *ct)
461 end = strpbrk(sbegin, ct);
467 EXPORT_SYMBOL(strsep);
470 #ifndef __HAVE_ARCH_MEMSET
472 * memset - Fill a region of memory with the given value
473 * @s: Pointer to the start of the area.
474 * @c: The byte to fill the area with
475 * @count: The size of the area.
477 * Do not use memset() to access IO space, use memset_io() instead.
479 void *memset(void *s, int c, size_t count)
487 EXPORT_SYMBOL(memset);
490 #ifndef __HAVE_ARCH_MEMCPY
492 * memcpy - Copy one area of memory to another
493 * @dest: Where to copy to
494 * @src: Where to copy from
495 * @count: The size of the area.
497 * You should not use this function to access IO space, use memcpy_toio()
498 * or memcpy_fromio() instead.
500 void *memcpy(void *dest, const void *src, size_t count)
509 EXPORT_SYMBOL(memcpy);
512 #ifndef __HAVE_ARCH_MEMMOVE
514 * memmove - Copy one area of memory to another
515 * @dest: Where to copy to
516 * @src: Where to copy from
517 * @count: The size of the area.
519 * Unlike memcpy(), memmove() copes with overlapping areas.
521 void *memmove(void *dest, const void *src, size_t count)
541 EXPORT_SYMBOL(memmove);
544 #ifndef __HAVE_ARCH_MEMCMP
546 * memcmp - Compare two areas of memory
547 * @cs: One area of memory
548 * @ct: Another area of memory
549 * @count: The size of the area.
552 int memcmp(const void *cs, const void *ct, size_t count)
554 const unsigned char *su1, *su2;
557 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
558 if ((res = *su1 - *su2) != 0)
562 EXPORT_SYMBOL(memcmp);
565 #ifndef __HAVE_ARCH_MEMSCAN
567 * memscan - Find a character in an area of memory.
568 * @addr: The memory area
569 * @c: The byte to search for
570 * @size: The size of the area.
572 * returns the address of the first occurrence of @c, or 1 byte past
573 * the area if @c is not found
575 void *memscan(void *addr, int c, size_t size)
577 unsigned char *p = addr;
587 EXPORT_SYMBOL(memscan);
590 #ifndef __HAVE_ARCH_STRSTR
592 * strstr - Find the first substring in a %NUL terminated string
593 * @s1: The string to be searched
594 * @s2: The string to search for
596 char *strstr(const char *s1, const char *s2)
606 if (!memcmp(s1, s2, l2))
612 EXPORT_SYMBOL(strstr);
615 #ifndef __HAVE_ARCH_MEMCHR
617 * memchr - Find a character in an area of memory.
618 * @s: The memory area
619 * @c: The byte to search for
620 * @n: The size of the area.
622 * returns the address of the first occurrence of @c, or %NULL
625 void *memchr(const void *s, int c, size_t n)
627 const unsigned char *p = s;
629 if ((unsigned char)c == *p++) {
630 return (void *)(p - 1);
635 EXPORT_SYMBOL(memchr);