1.\" Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com> 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 3. The name of the author may not be used to endorse or promote 12.\" products derived from this software without specific prior written 13.\" permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27\" $FreeBSD$ 28.\" 29.Dd August 24, 2005 30.Dt MEMMEM 3 31.Os 32.Sh NAME 33.Nm memmem 34.Nd locate a byte substring in a byte string 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In string.h 39.Ft void * 40.Fn memmem "const char *big" "size_t big_len" \ 41"const char *little" "size_t little_len" 42.Sh DESCRIPTION 43The 44.Fn memmem 45function 46locates the first occurrence of the byte string 47.Fa little 48in the byte string 49.Fa big . 50.Sh RETURN VALUES 51If 52.Fa big_len 53is smaller than 54.Fa little_len , 55if 56.Fa little_len 57is 0, if 58.Fa big_len 59is 0 or if 60.Fa little 61occurs nowhere in 62.Fa big , 63.Dv NULL 64is returned; 65otherwise a pointer to the first character of the first occurrence of 66.Fa little 67is returned. 68.Sh SEE ALSO 69.Xr memchr 3 , 70.Xr strchr 3 , 71.Xr strstr 3 72.Sh CONFORMING TO 73.Fn memmem 74is a GNU extension. 75.Sh HISTORY 76The 77.Fn memmem 78function first appeared in 79.Fx 6.0 . 80.Sh AUTHOR 81Pascal Gloor <pascal.gloor@spale.com> 82.Sh BUGS 83This function was broken in Linux libc up to and including version 5.0.9 84and in GNU libc prior to version 2.1. 85