/*
* 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>
#ifndef __HAVE_ARCH_STRNICMP
23 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;
29 if (len) {
30 do {
c1 = *s1; c2 = *s2;
s1++; s2++;
33 if (!c1)
34 break;
35 if (!c2)
36 break;
37 if (c1 == c2)
38 continue;
c1 = tolower(c1);
c2 = tolower(c2);
41 if (c1 != c2)
42 break;
43 } while (--len);
}
45 return (int)c1 - (int)c2;
}
#endif
char * ___strtok;
#ifndef __HAVE_ARCH_STRCPY
char * strcpy(char * dest,const char *src)
{
char *tmp = dest;
while ((*dest++ = *src++) != '\0')
/* nothing */;
return tmp;
}
#endif
#ifndef __HAVE_ARCH_STRNCPY
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
char * strcat(char * dest, const char * src)
{
char *tmp = dest;
while (*dest)
dest++;
while ((*dest++ = *src++) != '\0')
;
return tmp;
}
#endif
#ifndef __HAVE_ARCH_STRNCAT
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
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
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
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
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
size_t strlen(const char * s)
{
const char *sc;
for (sc = s; *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
#endif
#ifndef __HAVE_ARCH_STRNLEN
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_STRSPN
182 size_t strspn(const char *s, const char *accept)
{
const char *p;
const char *a;
size_t count = 0;
188 for (p = s; *p != '\0'; ++p) {
189 for (a = accept; *a != '\0'; ++a) {
190 if (*p == *a)
191 break;
}
193 if (*a == '\0')
194 return count;
++count;
}
198 return count;
}
#endif
#ifndef __HAVE_ARCH_STRPBRK
203 char * strpbrk(const char * cs,const char * ct)
{
const char *sc1,*sc2;
207 for( sc1 = cs; *sc1 != '\0'; ++sc1) {
208 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
209 if (*sc1 == *sc2)
210 return (char *) sc1;
}
}
213 return NULL;
}
#endif
#ifndef __HAVE_ARCH_STRTOK
218 char * strtok(char * s,const char * ct)
{
char *sbegin, *send;
sbegin = s ? s : ___strtok;
223 if (!sbegin) {
224 return NULL;
}
sbegin += strspn(sbegin,ct);
227 if (*sbegin == '\0') {
___strtok = NULL;
229 return( NULL );
}
send = strpbrk( sbegin, ct);
232 if (send && *send != '\0')
*send++ = '\0';
___strtok = send;
235 return (sbegin);
}
#endif
#ifndef __HAVE_ARCH_STRSEP
241 char * strsep(char **s, const char * ct)
{
char *sbegin=*s;
244 if (!sbegin)
245 return NULL;
sbegin += strspn(sbegin,ct);
248 if (*sbegin == '\0')
249 return NULL;
*s = strpbrk( sbegin, ct);
252 if (*s && **s != '\0')
*(*s)++ = '\0';
254 return (sbegin);
}
#endif
#ifndef __HAVE_ARCH_MEMSET
void * memset(void * s,int c,size_t count)
{
char *xs = (char *) s;
while (count--)
*xs++ = c;
return s;
}
#endif
#ifndef __HAVE_ARCH_BCOPY
271 char * bcopy(const char * src, char * dest, int count)
{
char *tmp = dest;
275 while (count--)
*tmp++ = *src++;
278 return dest;
}
#endif
#ifndef __HAVE_ARCH_MEMCPY
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
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
317 int memcmp(const void * cs,const void * ct,size_t count)
{
const unsigned char *su1, *su2;
signed char res = 0;
322 for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
323 if ((res = *su1 - *su2) != 0)
324 break;
325 return res;
}
#endif
/*
* find the first occurrence of byte 'c', or 1 past the area if none
*/
#ifndef __HAVE_ARCH_MEMSCAN
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
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
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