View Source: memmem(3) - Waikato Linux Users Group

Edit PageHistory Diff Info LikePages

MEMMEM
!!!MEMMEM
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
BUGS
SEE ALSO
----
!!NAME


memmem - locate a substring
!!SYNOPSIS


__#define _GNU_SOURCE
#include
__''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. Since libc
5.0.9 is still widely used, this is a dangerous function to
use.
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, and returns a
pointer to the last byte of `haystack'. This is fixed in
glibc 2.1.
!!SEE ALSO


strstr(3)
----

2 pages link to memmem(3):

This page is a man page (or other imported legacy content). We are unable to automatically determine the license status of this page.

Last edited on Tuesday, June 4, 2002 12:24:28 am by "perry"

Edit PageHistory Diff Info LikePages