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.
SEE ALSO¶
bstring(3),
strstr(3)
COLOPHON¶
This page is part of release 4.10 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/.