1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)memchr.3 8.1 (Berkeley) 6/4/93 33.\" $NetBSD: memchr.3,v 1.11 2009/04/10 23:24:35 wiz Exp $ 34.\" 35.Dd April 10, 2009 36.Dt MEMCHR 3 37.Os 38.Sh NAME 39.Nm memchr , 40.Nm memrchr 41.Nd locate byte in byte string 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In string.h 46.Ft void * 47.Fn memchr "const void *b" "int c" "size_t len" 48.Ft void * 49.Fn memrchr "const void *b" "int c" "size_t len" 50.Sh DESCRIPTION 51The 52.Fn memchr 53function 54locates the first occurrence of 55.Fa c 56(converted to an unsigned char) 57in string 58.Fa b . 59The 60.Fn memrchr 61function 62locates the last occurrence of 63.Fa c 64(converted to an unsigned char) 65in string 66.Fa b . 67.Sh RETURN VALUES 68The 69.Fn memchr 70and 71.Fn memrchr 72functions 73return a pointer to the byte located, or 74.Dv NULL 75if no such byte exists within 76.Fa len 77bytes. 78.Sh SEE ALSO 79.Xr index 3 , 80.Xr rindex 3 , 81.Xr strchr 3 , 82.Xr strcspn 3 , 83.Xr strpbrk 3 , 84.Xr strrchr 3 , 85.Xr strsep 3 , 86.Xr strspn 3 , 87.Xr strstr 3 , 88.Xr strtok 3 89.Sh STANDARDS 90The 91.Fn memchr 92function 93conforms to 94.St -ansiC . 95