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gcc.gnu.org Git - gcc.git/blob - libiberty/memcmp.c
1 /* memcmp -- compare two memory regions.
2 This function is in the public domain. */
6 @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, size_t @var{count})
8 Compares the first @var{count} bytes of two areas of memory. Returns
9 zero if they are the same, a value less than zero if @var{x} is
10 lexically less than @var{y}, or a value greater than zero if @var{x}
11 is lexically greater than @var{y}. Note that lexical order is determined
12 as if comparing unsigned char arrays.
22 #define size_t unsigned long
26 DEFUN(memcmp
, (str1
, str2
, count
),
27 const PTR str1 AND
const PTR str2 AND
size_t count
)
29 register const unsigned char *s1
= (const unsigned char*)str1
;
30 register const unsigned char *s2
= (const unsigned char*)str2
;
35 return s1
[-1] < s2
[-1] ? -1 : 1;
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