hbc/wiipax/stub/string.c
2016-11-23 14:35:12 +09:00

95 lines
1.3 KiB
C

/*
* linux/lib/string.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include "string.h"
size_t strnlen(const char *s, size_t count)
{
const char *sc;
for (sc = s; count-- && *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
size_t strlen(const char *s)
{
const char *sc;
for (sc = s; *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
char *strncpy(char *dst, const char *src, size_t n)
{
char *ret = dst;
while (n && (*dst++ = *src++))
n--;
while (n--)
*dst++ = 0;
return ret;
}
char *strcpy(char *dst, const char *src)
{
char *ret = dst;
while ((*dst++ = *src++))
;
return ret;
}
int strcmp(const char *p, const char *q)
{
for (;;) {
unsigned char a, b;
a = *p++;
b = *q++;
if (a == 0 || a != b)
return a - b;
}
}
void *memset(void *dst, int x, size_t n)
{
unsigned char *p;
for (p = dst; n; n--)
*p++ = x;
return dst;
}
void *memcpy(void *dst, const void *src, size_t n)
{
unsigned char *p;
const unsigned char *q;
for (p = dst, q = src; n; n--)
*p++ = *q++;
return dst;
}
int memcmp(const void *s1, const void *s2, size_t n)
{
unsigned char *us1 = (unsigned char *) s1;
unsigned char *us2 = (unsigned char *) s2;
while (n-- != 0) {
if (*us1 != *us2)
return (*us1 < *us2) ? -1 : +1;
us1++;
us2++;
}
return 0;
}