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[binutils.git] / libiberty / memcmp.c
blob92f2b6e6425726f7e1fd12f26120a4200e62c10b
1 /* memcmp -- compare two memory regions.
2 This function is in the public domain. */
4 /*
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.
14 @end deftypefn
18 #include <ansidecl.h>
19 #ifdef ANSI_PROTOTYPES
20 #include <stddef.h>
21 #else
22 #define size_t unsigned long
23 #endif
25 int
26 memcmp (str1, str2, count)
27 const PTR str1;
28 const PTR str2;
29 size_t count;
31 register const unsigned char *s1 = (const unsigned char*)str1;
32 register const unsigned char *s2 = (const unsigned char*)str2;
34 while (count-- > 0)
36 if (*s1++ != *s2++)
37 return s1[-1] < s2[-1] ? -1 : 1;
39 return 0;