memmem (3)

#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);

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.

Multithreading (see pthreads(7))

The memmem() function is thread-safe.

This function is a GNU extension.

In glibc 2.0, if needle is empty, memmem() returns a pointer to the last byte of haystack. This is fixed in glibc 2.1.

strstr(3)

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