memmem - locate a substring
SYNOPSIS
#define _GNU_SOURCE
#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 occur
rence 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)
Man(1) output converted with
man2html