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string.c
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string.c
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#include "types.h"
#include "x86.h"
void *
memset(void *dst, int c, uint n)
{
if ((int)dst % 4 == 0 && n % 4 == 0)
{
c &= 0xFF;
stosl(dst, (c << 24) | (c << 16) | (c << 8) | c, n / 4);
}
else
stosb(dst, c, n);
return dst;
}
int memcmp(const void *v1, const void *v2, uint n)
{
const uchar *s1, *s2;
s1 = v1;
s2 = v2;
while (n-- > 0)
{
if (*s1 != *s2)
return *s1 - *s2;
s1++, s2++;
}
return 0;
}
void *
memmove(void *dst, const void *src, uint n)
{
const char *s;
char *d;
s = src;
d = dst;
if (s < d && s + n > d)
{
s += n;
d += n;
while (n-- > 0)
*--d = *--s;
}
else
while (n-- > 0)
*d++ = *s++;
return dst;
}
// memcpy exists to placate GCC. Use memmove.
void *
memcpy(void *dst, const void *src, uint n)
{
return memmove(dst, src, n);
}
int strncmp(const char *p, const char *q, uint n)
{
while (n > 0 && *p && *p == *q)
n--, p++, q++;
if (n == 0)
return 0;
return (uchar)*p - (uchar)*q;
}
char *
strncpy(char *s, const char *t, int n)
{
char *os;
os = s;
while (n-- > 0 && (*s++ = *t++) != 0)
;
while (n-- > 0)
*s++ = 0;
return os;
}
// Like strncpy but guaranteed to NUL-terminate.
char *
safestrcpy(char *s, const char *t, int n)
{
char *os;
os = s;
if (n <= 0)
return os;
while (--n > 0 && (*s++ = *t++) != 0)
;
*s = 0;
return os;
}
int strlen(const char *s)
{
int n;
for (n = 0; s[n]; n++)
;
return n;
}