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#include "byte.h"
/* derived from public domain djbdns code */
unsigned int byte_chr(const char* s,unsigned int n,int c)
{
char ch;
const char *t;
ch = (char) c;
t = s;
for (;;) {
if (!n) break; if (*t == ch) break; ++t; --n;
if (!n) break; if (*t == ch) break; ++t; --n;
if (!n) break; if (*t == ch) break; ++t; --n;
if (!n) break; if (*t == ch) break; ++t; --n;
}
return t - s;
}
void byte_copy(void* To, unsigned int n, const void* From)
{
char *to=To;
const char *from=From;
for (;;) {
if (!n) return; *to++ = *from++; --n;
if (!n) return; *to++ = *from++; --n;
if (!n) return; *to++ = *from++; --n;
if (!n) return; *to++ = *from++; --n;
}
}
void byte_copyr(void* To,unsigned int n, const void* From)
{
char *to=(char*)To+n;
const char *from=(char*)From+n;
for (;;) {
if (!n) return; *--to = *--from; --n;
if (!n) return; *--to = *--from; --n;
if (!n) return; *--to = *--from; --n;
if (!n) return; *--to = *--from; --n;
}
}
int byte_diff(const void* S,unsigned int n, const void* T)
{
const char *s=S;
const char *t=T;
for (;;) {
if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
}
return ((int)(unsigned int)(unsigned char) *s)
- ((int)(unsigned int)(unsigned char) *t);
}
void byte_zero(void* S,unsigned int n)
{
char* s=S;
for (;;) {
if (!n) break; *s++ = 0; --n;
if (!n) break; *s++ = 0; --n;
if (!n) break; *s++ = 0; --n;
if (!n) break; *s++ = 0; --n;
}
}
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