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initial check-in, version 0.5.0

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This commit is contained in:
Rich Felker
2011-02-12 00:22:29 -05:00
commit 0b44a0315b
1021 changed files with 45711 additions and 0 deletions
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32
src/string/strlcpy.c Normal file
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#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include "libc.h"
#define ALIGN (sizeof(size_t)-1)
#define ONES ((size_t)-1/UCHAR_MAX)
#define HIGHS (ONES * (UCHAR_MAX/2+1))
#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
size_t strlcpy(char *d, const char *s, size_t n)
{
char *d0 = d;
size_t *wd;
const size_t *ws;
if (!n--) goto finish;
if (((uintptr_t)s & ALIGN) != ((uintptr_t)d & ALIGN)) {
for (; ((uintptr_t)s & ALIGN) && n && (*d=*s); n--, s++, d++);
if (n && *s) {
wd=(void *)d; ws=(const void *)s;
for (; n>=sizeof(size_t) && !HASZERO(*ws);
n-=sizeof(size_t), ws++, *wd++) *wd = *ws;
d=(void *)wd; s=(const void *)ws;
}
}
for (; n && (*d=*s); n--, s++, d++);
*d = 0;
finish:
return d-d0 + strlen(s);
}