osx man page for memcmp

MEMCMP(3)						   BSD Library Functions Manual 						 MEMCMP(3)

NAME
     memcmp -- compare byte string

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <string.h>

     int
     memcmp(const void *s1, const void *s2, size_t n);

DESCRIPTION
     The memcmp() function compares byte string s1 against byte string s2.  Both strings are assumed to be n bytes long.

RETURN VALUES
     The memcmp() function returns zero if the two strings are identical, otherwise returns the difference between the first two differing bytes
     (treated as unsigned char values, so that '200' is greater than '', for example).  Zero-length strings are always identical.

SEE ALSO
     bcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strxfrm(3), wmemcmp(3)

STANDARDS
     The memcmp() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								   June 4, 1993 							       BSD