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FreeBSD 11.0 - man page for memcmp (freebsd section 3)

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 *b1, const void *b2, size_t len);
DESCRIPTION
The memcmp() function compares byte string b1 against byte string b2. Both strings are assumed to be len 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 '\0', 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

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