freebsd-dev/contrib/binutils/libiberty/memcmp.c
David E. O'Brien da03bc7002 Import of Binutils from the FSF 2.15 branch (just post-.0 release).
These bits are taken from the FSF anoncvs repo on 23-May-2004 04:41:00 UTC.
2004-06-16 05:45:41 +00:00

42 lines
971 B
C

/* memcmp -- compare two memory regions.
This function is in the public domain. */
/*
@deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, size_t @var{count})
Compares the first @var{count} bytes of two areas of memory. Returns
zero if they are the same, a value less than zero if @var{x} is
lexically less than @var{y}, or a value greater than zero if @var{x}
is lexically greater than @var{y}. Note that lexical order is determined
as if comparing unsigned char arrays.
@end deftypefn
*/
#include <ansidecl.h>
#ifdef ANSI_PROTOTYPES
#include <stddef.h>
#else
#define size_t unsigned long
#endif
int
memcmp (str1, str2, count)
const PTR str1;
const PTR str2;
size_t count;
{
register const unsigned char *s1 = (const unsigned char*)str1;
register const unsigned char *s2 = (const unsigned char*)str2;
while (count-- > 0)
{
if (*s1++ != *s2++)
return s1[-1] < s2[-1] ? -1 : 1;
}
return 0;
}