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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 sub-
       string, or NULL if the substring is not found.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +----------+---------------+---------+
       |Interface | Attribute     | Value   |
       +----------+---------------+---------+
       |memmem()  | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       This  function  is not specified in POSIX.1, but is present on a number
       of other systems.
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
       bstring(3), strstr(3)
COLOPHON
       This  page  is  part of release 4.15 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
       https://www.kernel.org/doc/man-pages/.
GNU                               2017-03-13                         MEMMEM(3)