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NAME

memmem — locate a byte substring in a byte string

LIBRARY

library “libc”

SYNOPSIS

#include <string.h>

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

RETURN VALUES

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.

SEE ALSO

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

CONFORMING TO

memmem() is a GNU extension.

HISTORY

The memmem() function first appeared in FreeBSD 6.0.

AUTHORS

Pascal Gloor <pascal.gloor@spale.com>

BUGS

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.