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BCMP(3) Library Functions Manual BCMP(3)

compare byte string

#include <strings.h>
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)

The bcmp() function first appeared in 4.2BSD.
November 24, 2015 OpenBSD-current