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[libc] Fix and externalise memswap()

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Make memswap() behave correctly if called with a length of zero.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-11-05 00:58:20 +00:00
parent de20c526e6
commit 53f3deee06
2 changed files with 30 additions and 15 deletions
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17
src/arch/x86/include/bits/string.h
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@@ -213,21 +213,8 @@ static inline void * memset ( void *dest, int fill, size_t len ) {
}
#define __HAVE_ARCH_MEMSWAP
static inline void * memswap(void *dest, void *src, size_t n)
{
long d0, d1, d2, d3;
__asm__ __volatile__(
"\n1:\t"
"movb (%2),%%al\n\t"
"xchgb (%1),%%al\n\t"
"inc %1\n\t"
"stosb\n\t"
"loop 1b"
: "=&c" (d0), "=&S" (d1), "=&D" (d2), "=&a" (d3)
: "0" (n), "1" (src), "2" (dest)
: "memory" );
return dest;
}
extern void * memswap ( void *dest, void *src, size_t len );
#define __HAVE_ARCH_STRNCMP