MEMMEM(3)                           Linux Programmer's Manual                           MEMMEM(3)



NAME
       memmem - locate a substring

SYNOPSIS
       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <string.h>

       void *memmem(const void *haystack, size_t haystacklen,
                    const void *needle, size_t needlelen);

DESCRIPTION
       The  memmem()  function finds the start of the first occurrence of the substring needle of
       length needlelen in the memory area haystack of length haystacklen.

RETURN VALUE
       The memmem() function returns a pointer to the beginning of the substring, or NULL if  the
       substring is not found.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The memmem() function is thread-safe.

CONFORMING TO
       This function is a GNU extension.

BUGS
       In glibc 2.0, if needle is empty, memmem() returns a pointer to the last byte of haystack.
       This is fixed in glibc 2.1.

SEE ALSO
       strstr(3)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2014-08-19                                  MEMMEM(3)