MEMMEM
Section: Linux Programmer's Manual (3)
Updated: 2008-12-05
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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.
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 3.35 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://man7.org/linux/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- BUGS
-
- SEE ALSO
-
- COLOPHON
-
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