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Man Pages
MEMCMP(3) FreeBSD Library Functions Manual MEMCMP(3)

memcmp
compare byte string

Standard C Library (libc, -lc)

#include <string.h>
int
memcmp(const void *b1, const void *b2, size_t len);

The memcmp() function compares byte string b1 against byte string b2. Both strings are assumed to be len bytes long.

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.

bcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strxfrm(3), timingsafe_memcmp(3), wmemcmp(3)

The memcmp() function conforms to ISO/IEC 9899:1990 (“ISO C90”).
August 15, 2016 FreeBSD 12.0-RELEASE

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