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MEMMEM(3) Library Functions Manual MEMMEM(3)

memmemlocate a byte substring in a byte string

library “libc”

#include <string.h>

void *
memmem(const void *big, size_t big_len, const void *little, size_t little_len);

The () function locates the first occurrence of the byte string little in the byte string big.

If little_len is zero big is returned (that is, an empty little is deemed to match at the beginning of big); if little occurs nowhere in big, NULL is returned; otherwise a pointer to the first character of the first occurrence of little is returned.

memchr(3), strchr(3), strstr(3)

memmem() is a GNU extension.

The memmem() function first appeared in FreeBSD 6.0.

Pascal Gloor <pascal.gloor@spale.com>

This function was broken in Linux libc up to and including version 5.0.9 and in GNU libc prior to version 2.1. Prior to FreeBSD 11.0 memmem returned NULL when little_len equals 0.

May 26, 2015 FreeBSD-11.1