1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" 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.\" $OpenBSD: strchr.3,v 1.9 2007/05/31 19:19:32 jmc Exp $ 33.\" 34.Dd $Mdocdate: May 31 2007 $ 35.Dt STRCHR 3 36.Os 37.Sh NAME 38.Nm strchr , 39.Nm index 40.Nd locate first occurrence of a character in a string 41.Sh SYNOPSIS 42.Fd #include <string.h> 43.Ft char * 44.Fn strchr "const char *s" "int c" 45.Ft char * 46.Fn index "const char *s" "int c" 47.Sh DESCRIPTION 48The 49.Fn strchr 50function locates the first occurrence of the character 51.Fa c 52in the string 53.Fa s . 54The terminating NUL character is considered part of the string. 55If 56.Fa c 57is 58.Ql \e0 , 59.Fn strchr 60locates the terminating 61.Ql \e0 . 62.Pp 63The 64.Fn index 65function is an old synonym for 66.Fn strchr . 67.Sh RETURN VALUES 68The 69.Fn strchr 70function returns a pointer to the located character or 71.Dv NULL 72if the character does not appear in the string. 73.Sh EXAMPLES 74After the following call to 75.Fn strchr , 76.Va p 77will point to the string 78.Qq oobar : 79.Bd -literal -offset indent 80char *p; 81char *s = "foobar"; 82 83p = strchr(s, 'o'); 84.Ed 85.Sh SEE ALSO 86.Xr memchr 3 , 87.Xr strcspn 3 , 88.Xr strpbrk 3 , 89.Xr strrchr 3 , 90.Xr strsep 3 , 91.Xr strspn 3 , 92.Xr strstr 3 , 93.Xr strtok 3 94.Sh STANDARDS 95The 96.Fn strchr 97function conforms to 98.St -ansiC . 99.Pp 100The 101.Fn index 102function is deprecated and shouldn't be used in new code. 103