MEMMEM(3)              FreeBSD 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 little_len is zero big is returned (that is, an empty little is deemed
     to match at the beginning of big); 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.  It was replaced
     with an optimized O(n) implementation from the musl libc project in
     FreeBSD 12.0.  Pascal Gloor <pascal.gloor@spale.com> provided this man
     page along with the previous implementation.

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.  Prior to FreeBSD 11.0 memmem
     returned NULL when little_len equals 0.

FreeBSD 13.1-RELEASE-p6         March 17, 2017         FreeBSD 13.1-RELEASE-p6