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MEMMEM

Linux Programmer's Manual (3)
2014-03-17
 

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

 

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 3.66 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/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
Multithreading (see pthreads(7))
CONFORMING TO
BUGS
SEE ALSO
COLOPHON

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Time: 21:43:01 GMT, July 12, 2014