memcmp.3 (604B)
1 .TH MEMCMP 3 2 .SH NAME 3 memcmp - compare two memory blocks byte by byte 4 .SH SYNOPSIS 5 #include <string.h> 6 7 int memcmp (const void *s1, const void *s2, size_t n) 8 .SH DESCRIPTION 9 The 10 .BR memcmp () 11 function compares the first 12 .I n 13 bytes of the memory blocks pointed to by 14 .I s1 15 and 16 .IR s2 . 17 The comparison is performed as if each byte were unsigned char. 18 .SH RETURN VALUE 19 A positive integer is returned if 20 .I s1 21 is lexicographically greater than 22 .IR s2 , 23 zero if the two blocks are equal, 24 and a negative integer if 25 .I s1 26 is lexicographically less than 27 .IR s2 . 28 .SH STANDARDS 29 ISO/IEC 9899:1999 Section 7.21.4.1