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

MEMMEM(3)						   BSD Library Functions Manual 						 MEMMEM(3)

NAME
memmem -- locate a byte substring in a byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h> void * memmem(const void *big, size_t big_len, const void *little, size_t little_len);
DESCRIPTION
The memmem() function locates the first occurrence of the byte string little in the byte string big.
RETURN VALUES
If big_len is smaller than little_len, if little_len is 0, if big_len is 0 or if little occurs nowhere in big, NULL is returned; otherwise a pointer to the first character of the first occurrence of little is returned.
SEE ALSO
memchr(3), strchr(3), strstr(3)
CONFORMING TO
memmem() is a GNU extension.
HISTORY
The memmem() function first appeared in FreeBSD 6.0.
AUTHORS
Pascal Gloor <pascal.gloor@spale.com>
BUGS
This function was broken in Linux libc up to and including version 5.0.9 and in GNU libc prior to version 2.1.
BSD
August 24, 2005 BSD