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#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
The memmem() function returns a pointer to the beginning of the sub-
string, or NULL if the substring is not found.
Multithreading (see pthreads(7))
The memmem() function is thread-safe.
This function is a GNU extension.
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.
GNU 2014-03-17 MEMMEM(3)