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: head/lib/libc/string/memmem.3 152746 2005-11-24 06:56:21Z ru $ 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.Fo memmem 41.Fa "const void *big" "size_t big_len" 42.Fa "const void *little" "size_t little_len" 43.Fc 44.Sh DESCRIPTION 45The 46.Fn memmem 47function 48locates the first occurrence of the byte string 49.Fa little 50in the byte string 51.Fa big . 52.Sh RETURN VALUES 53If 54.Fa big_len 55is smaller than 56.Fa little_len , 57if 58.Fa little_len 59is 0, if 60.Fa big_len 61is 0 or if 62.Fa little 63occurs nowhere in 64.Fa big , 65.Dv NULL 66is returned; 67otherwise a pointer to the first character of the first occurrence of 68.Fa little 69is returned. 70.Sh SEE ALSO 71.Xr memchr 3 , 72.Xr strchr 3 , 73.Xr strstr 3 74.Sh CONFORMING TO 75.Fn memmem 76is a GNU extension. 77.Sh HISTORY 78The 79.Fn memmem 80function first appeared in 81.Fx 6.0 . 82.Sh AUTHORS 83.An Pascal Gloor Aq Mt pascal.gloor@spale.com 84.Sh BUGS 85This function was broken in Linux libc up to and including version 5.0.9 86and in GNU libc prior to version 2.1. 87