mirror of
https://github.com/fluencelabs/musl
synced 2025-06-25 20:51:53 +00:00
400c5e5c83
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
30 lines
666 B
C
30 lines
666 B
C
#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)
|
|
|
|
char *__stpcpy(char *restrict d, const char *restrict s)
|
|
{
|
|
size_t *wd;
|
|
const size_t *ws;
|
|
|
|
if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
|
|
for (; (*d=*s) && ((uintptr_t)s & ALIGN); s++, d++);
|
|
if (!*s) return d;
|
|
wd=(void *)d; ws=(const void *)s;
|
|
for (; !HASZERO(*ws); *wd++ = *ws++);
|
|
d=(void *)wd; s=(const void *)ws;
|
|
}
|
|
for (; (*d=*s); s++, d++);
|
|
|
|
return d;
|
|
}
|
|
|
|
weak_alias(__stpcpy, stpcpy);
|