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¶
For an explanation of the terms used in this section, see attributes(7).
| Interface |
Attribute |
Value |
| memmem () |
Thread safety |
MT-Safe |
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.
COLOPHON¶
This page is part of release 5.04 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/.
