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 <lwk/kernel.h>
23 #include <lwk/types.h>
24 #include <lwk/string.h>
25 #include <lwk/ctype.h>
26 #include <lwk/linux_compat.h>
29 #ifndef __HAVE_ARCH_STRNICMP
31 * strnicmp - Case insensitive, length-limited string comparison
33 * @s2: The other string
34 * @len: the maximum number of characters to compare
36 int strnicmp(const char *s1, const char *s2, size_t len)
38 /* Yes, Virginia, it had better be unsigned */
60 return (int)c1 - (int)c2;
62 EXPORT_SYMBOL(strnicmp);
65 #ifndef __HAVE_ARCH_STRCPY
67 * strcpy - Copy a %NUL terminated string
68 * @dest: Where to copy the string to
69 * @src: Where to copy the string from
72 char *strcpy(char *dest, const char *src)
76 while ((*dest++ = *src++) != '\0')
80 EXPORT_SYMBOL(strcpy);
83 #ifndef __HAVE_ARCH_STRNCPY
85 * strncpy - Copy a length-limited, %NUL-terminated string
86 * @dest: Where to copy the string to
87 * @src: Where to copy the string from
88 * @count: The maximum number of bytes to copy
90 * The result is not %NUL-terminated if the source exceeds
93 * In the case where the length of @src is less than that of
94 * count, the remainder of @dest will be padded with %NUL.
97 char *strncpy(char *dest, const char *src, size_t count)
102 if ((*tmp = *src) != 0)
109 EXPORT_SYMBOL(strncpy);
112 #ifndef __HAVE_ARCH_STRLCPY
114 * strlcpy - Copy a %NUL terminated string into a sized buffer
115 * @dest: Where to copy the string to
116 * @src: Where to copy the string from
117 * @size: size of destination buffer
119 * Compatible with *BSD: the result is always a valid
120 * NUL-terminated string that fits in the buffer (unless,
121 * of course, the buffer size is zero). It does not pad
122 * out the result like strncpy() does.
124 size_t strlcpy(char *dest, const char *src, size_t size)
126 size_t ret = strlen(src);
129 size_t len = (ret >= size) ? size - 1 : ret;
130 memcpy(dest, src, len);
135 EXPORT_SYMBOL(strlcpy);
138 #ifndef __HAVE_ARCH_STRCAT
140 * strcat - Append one %NUL-terminated string to another
141 * @dest: The string to be appended to
142 * @src: The string to append to it
145 char *strcat(char *dest, const char *src)
151 while ((*dest++ = *src++) != '\0')
155 EXPORT_SYMBOL(strcat);
158 #ifndef __HAVE_ARCH_STRNCAT
160 * strncat - Append a length-limited, %NUL-terminated string to another
161 * @dest: The string to be appended to
162 * @src: The string to append to it
163 * @count: The maximum numbers of bytes to copy
165 * Note that in contrast to strncpy, strncat ensures the result is
168 char *strncat(char *dest, const char *src, size_t count)
175 while ((*dest++ = *src++) != 0) {
184 EXPORT_SYMBOL(strncat);
187 #ifndef __HAVE_ARCH_STRLCAT
189 * strlcat - Append a length-limited, %NUL-terminated string to another
190 * @dest: The string to be appended to
191 * @src: The string to append to it
192 * @count: The size of the destination buffer.
194 size_t strlcat(char *dest, const char *src, size_t count)
196 size_t dsize = strlen(dest);
197 size_t len = strlen(src);
198 size_t res = dsize + len;
200 /* This would be a bug */
201 BUG_ON(dsize >= count);
207 memcpy(dest, src, len);
211 EXPORT_SYMBOL(strlcat);
214 #ifndef __HAVE_ARCH_STRCMP
216 * strcmp - Compare two strings
218 * @ct: Another string
221 int strcmp(const char *cs, const char *ct)
226 if ((__res = *cs - *ct++) != 0 || !*cs++)
231 EXPORT_SYMBOL(strcmp);
234 #ifndef __HAVE_ARCH_STRNCMP
236 * strncmp - Compare two length-limited strings
238 * @ct: Another string
239 * @count: The maximum number of bytes to compare
241 int strncmp(const char *cs, const char *ct, size_t count)
243 signed char __res = 0;
246 if ((__res = *cs - *ct++) != 0 || !*cs++)
252 EXPORT_SYMBOL(strncmp);
255 #ifndef __HAVE_ARCH_STRCHR
257 * strchr - Find the first occurrence of a character in a string
258 * @s: The string to be searched
259 * @c: The character to search for
261 char *strchr(const char *s, int c)
263 for (; *s != (char)c; ++s)
268 EXPORT_SYMBOL(strchr);
271 #ifndef __HAVE_ARCH_STRRCHR
273 * strrchr - Find the last occurrence of a character in a string
274 * @s: The string to be searched
275 * @c: The character to search for
277 char *strrchr(const char *s, int c)
279 const char *p = s + strlen(s);
286 EXPORT_SYMBOL(strrchr);
289 #ifndef __HAVE_ARCH_STRNCHR
291 * strnchr - Find a character in a length limited string
292 * @s: The string to be searched
293 * @count: The number of characters to be searched
294 * @c: The character to search for
296 char *strnchr(const char *s, size_t count, int c)
298 for (; count-- && *s != '\0'; ++s)
303 EXPORT_SYMBOL(strnchr);
306 #ifndef __HAVE_ARCH_STRLEN
308 * strlen - Find the length of a string
309 * @s: The string to be sized
311 size_t strlen(const char *s)
315 for (sc = s; *sc != '\0'; ++sc)
319 EXPORT_SYMBOL(strlen);
322 #ifndef __HAVE_ARCH_STRNLEN
324 * strnlen - Find the length of a length-limited string
325 * @s: The string to be sized
326 * @count: The maximum number of bytes to search
328 size_t strnlen(const char *s, size_t count)
332 for (sc = s; count-- && *sc != '\0'; ++sc)
336 EXPORT_SYMBOL(strnlen);
339 #ifndef __HAVE_ARCH_STRSPN
341 * strspn - Calculate the length of the initial substring of @s which only
342 * contain letters in @accept
343 * @s: The string to be searched
344 * @accept: The string to search for
346 size_t strspn(const char *s, const char *accept)
352 for (p = s; *p != '\0'; ++p) {
353 for (a = accept; *a != '\0'; ++a) {
364 EXPORT_SYMBOL(strspn);
367 #ifndef __HAVE_ARCH_STRCSPN
369 * strcspn - Calculate the length of the initial substring of @s which does
370 * not contain letters in @reject
371 * @s: The string to be searched
372 * @reject: The string to avoid
374 size_t strcspn(const char *s, const char *reject)
380 for (p = s; *p != '\0'; ++p) {
381 for (r = reject; *r != '\0'; ++r) {
389 EXPORT_SYMBOL(strcspn);
392 #ifndef __HAVE_ARCH_STRPBRK
394 * strpbrk - Find the first occurrence of a set of characters
395 * @cs: The string to be searched
396 * @ct: The characters to search for
398 char *strpbrk(const char *cs, const char *ct)
400 const char *sc1, *sc2;
402 for (sc1 = cs; *sc1 != '\0'; ++sc1) {
403 for (sc2 = ct; *sc2 != '\0'; ++sc2) {
410 EXPORT_SYMBOL(strpbrk);
413 #ifndef __HAVE_ARCH_STRSEP
415 * strsep - Split a string into tokens
416 * @s: The string to be searched
417 * @ct: The characters to search for
419 * strsep() updates @s to point after the token, ready for the next call.
421 * It returns empty tokens, too, behaving exactly like the libc function
422 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
423 * Same semantics, slimmer shape. ;)
425 char *strsep(char **s, const char *ct)
433 end = strpbrk(sbegin, ct);
439 EXPORT_SYMBOL(strsep);
442 #ifndef __HAVE_ARCH_MEMSET
444 * memset - Fill a region of memory with the given value
445 * @s: Pointer to the start of the area.
446 * @c: The byte to fill the area with
447 * @count: The size of the area.
449 * Do not use memset() to access IO space, use memset_io() instead.
451 void *memset(void *s, int c, size_t count)
459 EXPORT_SYMBOL(memset);
462 #ifndef __HAVE_ARCH_MEMCPY
464 * memcpy - Copy one area of memory to another
465 * @dest: Where to copy to
466 * @src: Where to copy from
467 * @count: The size of the area.
469 * You should not use this function to access IO space, use memcpy_toio()
470 * or memcpy_fromio() instead.
472 void *memcpy(void *dest, const void *src, size_t count)
481 EXPORT_SYMBOL(memcpy);
484 #ifndef __HAVE_ARCH_MEMMOVE
486 * memmove - Copy one area of memory to another
487 * @dest: Where to copy to
488 * @src: Where to copy from
489 * @count: The size of the area.
491 * Unlike memcpy(), memmove() copes with overlapping areas.
493 void *memmove(void *dest, const void *src, size_t count)
513 EXPORT_SYMBOL(memmove);
516 #ifndef __HAVE_ARCH_MEMCMP
518 * memcmp - Compare two areas of memory
519 * @cs: One area of memory
520 * @ct: Another area of memory
521 * @count: The size of the area.
524 int memcmp(const void *cs, const void *ct, size_t count)
526 const unsigned char *su1, *su2;
529 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
530 if ((res = *su1 - *su2) != 0)
534 EXPORT_SYMBOL(memcmp);
537 #ifndef __HAVE_ARCH_MEMSCAN
539 * memscan - Find a character in an area of memory.
540 * @addr: The memory area
541 * @c: The byte to search for
542 * @size: The size of the area.
544 * returns the address of the first occurrence of @c, or 1 byte past
545 * the area if @c is not found
547 void *memscan(void *addr, int c, size_t size)
549 unsigned char *p = addr;
559 EXPORT_SYMBOL(memscan);
562 #ifndef __HAVE_ARCH_STRSTR
564 * strstr - Find the first substring in a %NUL terminated string
565 * @s1: The string to be searched
566 * @s2: The string to search for
568 char *strstr(const char *s1, const char *s2)
578 if (!memcmp(s1, s2, l2))
584 EXPORT_SYMBOL(strstr);
587 #ifndef __HAVE_ARCH_MEMCHR
589 * memchr - Find a character in an area of memory.
590 * @s: The memory area
591 * @c: The byte to search for
592 * @n: The size of the area.
594 * returns the address of the first occurrence of @c, or %NULL
597 void *memchr(const void *s, int c, size_t n)
599 const unsigned char *p = s;
601 if ((unsigned char)c == *p++) {
602 return (void *)(p - 1);
607 EXPORT_SYMBOL(memchr);
612 * Converts error code into human readable string.
621 case ENOMEM: return "Out of memory";
622 case EINVAL: return "Invalid argument";