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libc.c
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libc.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int extcmp(const char *s1, const char *s2, size_t n);
int extcasecmp(const char *s1, const char *s2, size_t n);
char *strcasestr(const char *s1, const char *s2);
void *memset(void *m, int c, size_t n)
{
char *s = (char *) m;
while (n-- != 0)
{
*s++ = (char) c;
}
return m;
}
void *memcpy(void *dst0, const void *src0, size_t n)
{
char *dst = (char *)dst0;
char *src = (char *)src0;
void *save = dst0;
while (n--)
*dst++ = *src++;
return save;
}
int memcmp(const void* s1, const void* s2, size_t n)
{
const unsigned char *p1 = s1, *p2 = s2;
while(n--)
if( *p1 != *p2 )
return *p1 - *p2;
else
*p1++,*p2++;
return 0;
}
size_t strlen(const char *s)
{
const char *p = s;
while (*s) ++s;
return s - p;
}
char *strchr(const char *s, int c)
{
while (*s != (char)c)
if (!*s++)
return 0;
return (char *)s;
}
char *strrchr(const char *s, int c)
{
char* ret=0;
do {
if( *s == (char)c )
ret=s;
} while(*s++);
return ret;
}
char *strstr(const char *s1, const char *s2)
{
size_t n = strlen(s2);
while(*s1)
if(!memcmp(s1++,s2,n))
return s1-1;
return 0;
}
int strncasecmp (__const char *s1, __const char *s2, size_t n)
{
int c1, c2;
while(n--)
{
c1 = *((unsigned char *)(s1++));
c2 = *((unsigned char *)(s2++));
if (c1 >= 'A' && c1 <= 'Z') c1 = c1 + ('a' - 'A');
if (c2 >= 'A' && c2 <= 'Z') c2 = c2 + ('a' - 'A');
if (c1 != c2) return (c1 - c2);
if (c1 == '\0') return 0;
}
return 0;
}
int strcasecmp (__const char *s1, __const char *s2)
{
int c1, c2, n;
n=strlen(s1);
while(n--)
{
c1 = *((unsigned char *)(s1++));
c2 = *((unsigned char *)(s2++));
if (c1 >= 'A' && c1 <= 'Z') c1 = c1 + ('a' - 'A');
if (c2 >= 'A' && c2 <= 'Z') c2 = c2 + ('a' - 'A');
if (c1 != c2) return (c1 - c2);
if (c1 == '\0') return 0;
}
return 0;
}
char *strcasestr(const char *s1, const char *s2)
{
size_t n = strlen(s2);
while(*s1)
if(!strncasecmp(s1++,s2,n))
return s1-1;
return 0;
}
int strncmp(const char* s1, const char* s2, size_t n)
{
if(n==0) return 0;
while(*s1 && (*s1==*s2))
{
s1++,s2++;
n--;
if(n==0) break;
}
return *(const unsigned char*)s1-*(const unsigned char*)s2;
}
int strcmp(const char* s1, const char* s2)
{
while(*s1 && (*s1==*s2))
s1++,s2++;
return *(const unsigned char*)s1-*(const unsigned char*)s2;
}
char *strcpy(char *dest, const char* src)
{
char *ret = dest;
while (*dest++ = *src++)
;
return ret;
}
char *strncpy(char *dest, const char *src, size_t n)
{
char *ret = dest;
do {
if (!n--)
return ret;
} while (*dest++ = *src++);
while (n--)
*dest++ = 0;
return ret;
}
char *strcat(char *dest, const char *src)
{
char *ret = dest;
while (*dest)
dest++;
while (*dest++ = *src++)
;
return ret;
}
char *strtok(char * str, const char * delim)
{
static char* p=0;
if(str)
p=str;
else if(!p)
return 0;
str=p+strspn(p,delim);
p=str+strcspn(str,delim);
if(p==str)
return p=0;
p = *p ? *p=0,p+1 : 0;
return str;
}
size_t strcspn(const char *s1, const char *s2)
{
size_t ret=0;
while(*s1)
if(strchr(s2,*s1))
return ret;
else
s1++,ret++;
return ret;
}
size_t strspn(const char *s1, const char *s2)
{
size_t ret=0;
while(*s1 && strchr(s2,*s1++))
ret++;
return ret;
}
int extcmp(const char *s1, const char *s2, size_t n)
{
size_t s=strlen(s1);
if(n>s) return -1;
return memcmp(s1+(s-n), s2, n);
}
int extcasecmp(const char *s1, const char *s2, size_t n)
{
size_t s=strlen(s1);
if(n>s) return -1;
return strncasecmp(s1+(s-n), s2, n);
}