MEMMEM(3)                 (2017-03-13)                  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 occur-
          rence 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
          For an explanation of the terms used in this section, see
          attributes(7).  allbox; lb lb lb l l l.
          Interface Attribute Value T{ memmem() T}   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 5.10 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/.

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