tail head cat sleep
QR code linking to this page

Manual Pages  — MEMMEM

NAME

memmem – locate a byte substring in a byte string

CONTENTS

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <string.h>

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

DESCRIPTION

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

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 . It was replaced with an optimized O(n) implementation from the musl libc project in FreeBSD 12.0 . Pascal Gloor <Mt pascal.gloor@spale.com> provided this man page along with the previous implementation.

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.

MEMMEM (3) March 17, 2017

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

LISP = Lots of Irritating Silly Parentheses