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#include "byte.h"
/**
@file byte.c
@author djb
@brief byte manipulation functions
*/
unsigned int byte_chr(char *s,register unsigned int n,int c)
{
register char ch;
register char *t;
ch = 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(register char *to,register unsigned int n,register char *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(register char *to,register unsigned int n,register char *from)
{
to += n;
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(register char *s,register unsigned int n,register char *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);
}
unsigned int byte_rchr(char *s,register unsigned int n,int c)
{
register char ch;
register char *t;
register char *u;
ch = c;
t = s;
u = 0;
for (;;) {
if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
}
if (!u) { u = t; }
return u - s;
}
void byte_zero(char *s,register unsigned int n)
{
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;
}
}
void byte_fill(char *s,register unsigned int n,const int c)
{
register char ch;
ch = c;
for (;;) {
if (!n) { break; } *s++ = ch; --n;
if (!n) { break; } *s++ = ch; --n;
if (!n) { break; } *s++ = ch; --n;
if (!n) { break; } *s++ = ch; --n;
}
}
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