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include: simplify strlcpy()

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-10-18 12:50:13 +02:00
parent a542f5a713
commit 27bd77920d
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 7 additions and 33 deletions
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40
src/include/strlcpy.c
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@ -19,43 +19,17 @@
* This function has been copied from musl.
*/
#include <limits.h>
#include <stdint.h>
#include <string.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)
size_t strlcpy(char *dest, const char *src, size_t size)
{
char *d0 = d;
size_t *wd;
const size_t *ws;
size_t ret = strlen(src);
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;
}
if (size) {
size_t len = (ret >= size) ? size - 1 : ret;
memcpy(dest, src, len);
dest[len] = '\0';
}
for (; n && (*d = *s); n--, s++, d++)
;
*d = 0;
finish:
return d - d0 + strlen(s);
return ret;
}