+++ /dev/null
-/*
- * linux/lib/string.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- */
-
-/*
- * stupid library routines.. The optimized versions should generally be found
- * as inline code in <asm-xx/string.h>
- *
- * These are buggy as well..
- *
- * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
- * - Added strsep() which will replace strtok() soon (because strsep() is
- * reentrant and should be faster). Use only strsep() in new code, please.
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-#include <malloc.h>
-
-
-#if 0 /* not used - was: #ifndef __HAVE_ARCH_STRNICMP */
-/**
- * strnicmp - Case insensitive, length-limited string comparison
- * @s1: One string
- * @s2: The other string
- * @len: the maximum number of characters to compare
- */
-int strnicmp(const char *s1, const char *s2, size_t len)
-{
- /* Yes, Virginia, it had better be unsigned */
- unsigned char c1, c2;
-
- c1 = 0; c2 = 0;
- if (len) {
- do {
- c1 = *s1; c2 = *s2;
- s1++; s2++;
- if (!c1)
- break;
- if (!c2)
- break;
- if (c1 == c2)
- continue;
- c1 = tolower(c1);
- c2 = tolower(c2);
- if (c1 != c2)
- break;
- } while (--len);
- }
- return (int)c1 - (int)c2;
-}
-#endif
-
-char * ___strtok;
-
-#ifndef __HAVE_ARCH_STRCPY
-/**
- * strcpy - Copy a %NUL terminated string
- * @dest: Where to copy the string to
- * @src: Where to copy the string from
- */
-char * strcpy(char * dest,const char *src)
-{
- char *tmp = dest;
-
- while ((*dest++ = *src++) != '\0')
- /* nothing */;
- return tmp;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRNCPY
-/**
- * strncpy - Copy a length-limited, %NUL-terminated string
- * @dest: Where to copy the string to
- * @src: Where to copy the string from
- * @count: The maximum number of bytes to copy
- *
- * Note that unlike userspace strncpy, this does not %NUL-pad the buffer.
- * However, the result is not %NUL-terminated if the source exceeds
- * @count bytes.
- */
-char * strncpy(char * dest,const char *src,size_t count)
-{
- char *tmp = dest;
-
- while (count-- && (*dest++ = *src++) != '\0')
- /* nothing */;
-
- return tmp;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRCAT
-/**
- * strcat - Append one %NUL-terminated string to another
- * @dest: The string to be appended to
- * @src: The string to append to it
- */
-char * strcat(char * dest, const char * src)
-{
- char *tmp = dest;
-
- while (*dest)
- dest++;
- while ((*dest++ = *src++) != '\0')
- ;
-
- return tmp;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRNCAT
-/**
- * strncat - Append a length-limited, %NUL-terminated string to another
- * @dest: The string to be appended to
- * @src: The string to append to it
- * @count: The maximum numbers of bytes to copy
- *
- * Note that in contrast to strncpy, strncat ensures the result is
- * terminated.
- */
-char * strncat(char *dest, const char *src, size_t count)
-{
- char *tmp = dest;
-
- if (count) {
- while (*dest)
- dest++;
- while ((*dest++ = *src++)) {
- if (--count == 0) {
- *dest = '\0';
- break;
- }
- }
- }
-
- return tmp;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRCMP
-/**
- * strcmp - Compare two strings
- * @cs: One string
- * @ct: Another string
- */
-int strcmp(const char * cs,const char * ct)
-{
- register signed char __res;
-
- while (1) {
- if ((__res = *cs - *ct++) != 0 || !*cs++)
- break;
- }
-
- return __res;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRNCMP
-/**
- * strncmp - Compare two length-limited strings
- * @cs: One string
- * @ct: Another string
- * @count: The maximum number of bytes to compare
- */
-int strncmp(const char * cs,const char * ct,size_t count)
-{
- register signed char __res = 0;
-
- while (count) {
- if ((__res = *cs - *ct++) != 0 || !*cs++)
- break;
- count--;
- }
-
- return __res;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRCHR
-/**
- * strchr - Find the first occurrence of a character in a string
- * @s: The string to be searched
- * @c: The character to search for
- */
-char * strchr(const char * s, int c)
-{
- for(; *s != (char) c; ++s)
- if (*s == '\0')
- return NULL;
- return (char *) s;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRRCHR
-/**
- * strrchr - Find the last occurrence of a character in a string
- * @s: The string to be searched
- * @c: The character to search for
- */
-char * strrchr(const char * s, int c)
-{
- const char *p = s + strlen(s);
- do {
- if (*p == (char)c)
- return (char *)p;
- } while (--p >= s);
- return NULL;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRLEN
-/**
- * strlen - Find the length of a string
- * @s: The string to be sized
- */
-size_t strlen(const char * s)
-{
- const char *sc;
-
- for (sc = s; *sc != '\0'; ++sc)
- /* nothing */;
- return sc - s;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRNLEN
-/**
- * strnlen - Find the length of a length-limited string
- * @s: The string to be sized
- * @count: The maximum number of bytes to search
- */
-size_t strnlen(const char * s, size_t count)
-{
- const char *sc;
-
- for (sc = s; count-- && *sc != '\0'; ++sc)
- /* nothing */;
- return sc - s;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRDUP
-char * strdup(const char *s)
-{
- char *new;
-
- if ((s == NULL) ||
- ((new = malloc (strlen(s) + 1)) == NULL) ) {
- return NULL;
- }
-
- strcpy (new, s);
- return new;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRSPN
-/**
- * strspn - Calculate the length of the initial substring of @s which only
- * contain letters in @accept
- * @s: The string to be searched
- * @accept: The string to search for
- */
-size_t strspn(const char *s, const char *accept)
-{
- const char *p;
- const char *a;
- size_t count = 0;
-
- for (p = s; *p != '\0'; ++p) {
- for (a = accept; *a != '\0'; ++a) {
- if (*p == *a)
- break;
- }
- if (*a == '\0')
- return count;
- ++count;
- }
-
- return count;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRPBRK
-/**
- * strpbrk - Find the first occurrence of a set of characters
- * @cs: The string to be searched
- * @ct: The characters to search for
- */
-char * strpbrk(const char * cs,const char * ct)
-{
- const char *sc1,*sc2;
-
- for( sc1 = cs; *sc1 != '\0'; ++sc1) {
- for( sc2 = ct; *sc2 != '\0'; ++sc2) {
- if (*sc1 == *sc2)
- return (char *) sc1;
- }
- }
- return NULL;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRTOK
-/**
- * strtok - Split a string into tokens
- * @s: The string to be searched
- * @ct: The characters to search for
- *
- * WARNING: strtok is deprecated, use strsep instead.
- */
-char * strtok(char * s,const char * ct)
-{
- char *sbegin, *send;
-
- sbegin = s ? s : ___strtok;
- if (!sbegin) {
- return NULL;
- }
- sbegin += strspn(sbegin,ct);
- if (*sbegin == '\0') {
- ___strtok = NULL;
- return( NULL );
- }
- send = strpbrk( sbegin, ct);
- if (send && *send != '\0')
- *send++ = '\0';
- ___strtok = send;
- return (sbegin);
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRSEP
-/**
- * strsep - Split a string into tokens
- * @s: The string to be searched
- * @ct: The characters to search for
- *
- * strsep() updates @s to point after the token, ready for the next call.
- *
- * It returns empty tokens, too, behaving exactly like the libc function
- * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
- * Same semantics, slimmer shape. ;)
- */
-char * strsep(char **s, const char *ct)
-{
- char *sbegin = *s, *end;
-
- if (sbegin == NULL)
- return NULL;
-
- end = strpbrk(sbegin, ct);
- if (end)
- *end++ = '\0';
- *s = end;
-
- return sbegin;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRSWAB
-/**
- * strswab - swap adjacent even and odd bytes in %NUL-terminated string
- * s: address of the string
- *
- * returns the address of the swapped string or NULL on error. If
- * string length is odd, last byte is untouched.
- */
-char *strswab(const char *s)
-{
- char *p, *q;
-
- if ((NULL == s) || ('\0' == *s)) {
- return (NULL);
- }
-
- for (p=(char *)s, q=p+1; (*p != '\0') && (*q != '\0'); p+=2, q+=2) {
- char tmp;
-
- tmp = *p;
- *p = *q;
- *q = tmp;
- }
-
- return (char *) s;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMSET
-/**
- * memset - Fill a region of memory with the given value
- * @s: Pointer to the start of the area.
- * @c: The byte to fill the area with
- * @count: The size of the area.
- *
- * Do not use memset() to access IO space, use memset_io() instead.
- */
-void * memset(void * s,int c,size_t count)
-{
- char *xs = (char *) s;
-
- while (count--)
- *xs++ = c;
-
- return s;
-}
-#endif
-
-#ifndef __HAVE_ARCH_BCOPY
-/**
- * bcopy - Copy one area of memory to another
- * @src: Where to copy from
- * @dest: Where to copy to
- * @count: The size of the area.
- *
- * Note that this is the same as memcpy(), with the arguments reversed.
- * memcpy() is the standard, bcopy() is a legacy BSD function.
- *
- * You should not use this function to access IO space, use memcpy_toio()
- * or memcpy_fromio() instead.
- */
-char * bcopy(const char * src, char * dest, int count)
-{
- char *tmp = dest;
-
- while (count--)
- *tmp++ = *src++;
-
- return dest;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMCPY
-/**
- * memcpy - Copy one area of memory to another
- * @dest: Where to copy to
- * @src: Where to copy from
- * @count: The size of the area.
- *
- * You should not use this function to access IO space, use memcpy_toio()
- * or memcpy_fromio() instead.
- */
-void * memcpy(void * dest,const void *src,size_t count)
-{
- char *tmp = (char *) dest, *s = (char *) src;
-
- while (count--)
- *tmp++ = *s++;
-
- return dest;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMMOVE
-/**
- * memmove - Copy one area of memory to another
- * @dest: Where to copy to
- * @src: Where to copy from
- * @count: The size of the area.
- *
- * Unlike memcpy(), memmove() copes with overlapping areas.
- */
-void * memmove(void * dest,const void *src,size_t count)
-{
- char *tmp, *s;
-
- if (dest <= src) {
- tmp = (char *) dest;
- s = (char *) src;
- while (count--)
- *tmp++ = *s++;
- }
- else {
- tmp = (char *) dest + count;
- s = (char *) src + count;
- while (count--)
- *--tmp = *--s;
- }
-
- return dest;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMCMP
-/**
- * memcmp - Compare two areas of memory
- * @cs: One area of memory
- * @ct: Another area of memory
- * @count: The size of the area.
- */
-int memcmp(const void * cs,const void * ct,size_t count)
-{
- const unsigned char *su1, *su2;
- int res = 0;
-
- for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
- if ((res = *su1 - *su2) != 0)
- break;
- return res;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMSCAN
-/**
- * memscan - Find a character in an area of memory.
- * @addr: The memory area
- * @c: The byte to search for
- * @size: The size of the area.
- *
- * returns the address of the first occurrence of @c, or 1 byte past
- * the area if @c is not found
- */
-void * memscan(void * addr, int c, size_t size)
-{
- unsigned char * p = (unsigned char *) addr;
-
- while (size) {
- if (*p == c)
- return (void *) p;
- p++;
- size--;
- }
- return (void *) p;
-}
-#endif
-
-#ifndef __HAVE_ARCH_STRSTR
-/**
- * strstr - Find the first substring in a %NUL terminated string
- * @s1: The string to be searched
- * @s2: The string to search for
- */
-char * strstr(const char * s1,const char * s2)
-{
- int l1, l2;
-
- l2 = strlen(s2);
- if (!l2)
- return (char *) s1;
- l1 = strlen(s1);
- while (l1 >= l2) {
- l1--;
- if (!memcmp(s1,s2,l2))
- return (char *) s1;
- s1++;
- }
- return NULL;
-}
-#endif
-
-#ifndef __HAVE_ARCH_MEMCHR
-/**
- * memchr - Find a character in an area of memory.
- * @s: The memory area
- * @c: The byte to search for
- * @n: The size of the area.
- *
- * returns the address of the first occurrence of @c, or %NULL
- * if @c is not found
- */
-void *memchr(const void *s, int c, size_t n)
-{
- const unsigned char *p = s;
- while (n-- != 0) {
- if ((unsigned char)c == *p++) {
- return (void *)(p-1);
- }
- }
- return NULL;
-}
-
-#endif
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