x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
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
Multithreading (see pthreads(7))
The memmem() function is thread-safe.
CONFORMING TO
This function is a GNU extension.
BUGS
This function was broken in Linux libraries up to and including libc
5.0.9; there the needle and haystack arguments were interchanged, and a
pointer to the end of the first occurrence of needle was returned.
Both old and new libc's have the bug that if needle is empty,
haystack-1 (instead of haystack) is returned. And glibc 2.0 makes it
worse, returning 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 3.69 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 2014-03-17 MEMMEM(3)
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