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

bcmp
compare byte string

Standard C Library (libc, -lc)

#include <strings.h>

int
bcmp(const void *b1, const void *b2, size_t len);

The bcmp() function compares byte string b1 against byte string b2, returning zero if they are identical, non-zero otherwise. Both strings are assumed to be len bytes long. Zero-length strings are always identical.

The strings may overlap.

memcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strxfrm(3), timingsafe_bcmp(3)

A bcmp() function first appeared in 4.2BSD. Its prototype existed previously in <string.h> before it was moved to <strings.h> for IEEE Std 1003.1-2001 (“POSIX.1”) compliance.
August 15, 2016 FreeBSD 13.1-RELEASE

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