Linux 2.6 - man page for memmem (linux section 3)
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MEMMEM(3) Linux Programmer's Manual MEMMEM(3)
memmem - locate a substring
#define _GNU_SOURCE /* See feature_test_macros(7) */
void *memmem(const void *haystack, size_t haystacklen,
const void *needle, size_t needlelen);
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.
The memmem() function returns a pointer to the beginning of the substring, or NULL if the
substring is not found.
This function is a GNU extension.
This function was broken in Linux libraries up to and including libc 5.0.9; there the nee-
dle and haystack arguments were interchanged, and a pointer to the end of the first occur-
rence 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.
This page is part of release 3.55 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
GNU 2008-12-05 MEMMEM(3)
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