1.\" $OpenBSD: strchr.3,v 1.12 2015/11/24 09:14:35 daniel Exp $ 2.\" 3.\" Copyright (c) 1990, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Chris Torek and the American National Standards Committee X3, 8.\" on Information Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: November 24 2015 $ 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.In string.h 43.Ft char * 44.Fn strchr "const char *s" "int c" 45.In strings.h 46.Ft char * 47.Fn index "const char *s" "int c" 48.Sh DESCRIPTION 49The 50.Fn strchr 51function locates the first occurrence of the character 52.Fa c 53in the string 54.Fa s . 55The terminating NUL character is considered part of the string. 56If 57.Fa c 58is 59.Ql \e0 , 60.Fn strchr 61locates the terminating 62.Ql \e0 . 63.Pp 64The 65.Fn index 66function is an old synonym for 67.Fn strchr . 68.Sh RETURN VALUES 69The 70.Fn strchr 71function returns a pointer to the located character or 72.Dv NULL 73if the character does not appear in the string. 74.Sh EXAMPLES 75After the following call to 76.Fn strchr , 77.Va p 78will point to the string 79.Qq oobar : 80.Bd -literal -offset indent 81char *p; 82char *s = "foobar"; 83 84p = strchr(s, 'o'); 85.Ed 86.Sh SEE ALSO 87.Xr memchr 3 , 88.Xr strcspn 3 , 89.Xr strpbrk 3 , 90.Xr strrchr 3 , 91.Xr strsep 3 , 92.Xr strspn 3 , 93.Xr strstr 3 , 94.Xr strtok 3 , 95.Xr wcschr 3 96.Sh STANDARDS 97The 98.Fn strchr 99function conforms to 100.St -ansiC . 101.Pp 102The 103.Fn index 104function is deprecated and shouldn't be used in new code. 105.Sh HISTORY 106The 107.Fn index 108function first appeared in 109.At v7 . 110The 111.Fn strchr 112function first appeared in 113.At III 114and was reimplemented for 115.Bx 4.3 Tahoe . 116