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. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" $OpenBSD: strchr.3,v 1.7 2000/04/21 15:24:19 aaron Exp $ 37.\" 38.Dd June 29, 1991 39.Dt STRCHR 3 40.Os 41.Sh NAME 42.Nm strchr , 43.Nm index 44.Nd locate first occurrence of a character in a string 45.Sh SYNOPSIS 46.Fd #include <string.h> 47.Ft char * 48.Fn strchr "const char *s" "int c" 49.Ft char * 50.Fn index "const char *s" "int c" 51.Sh DESCRIPTION 52The 53.Fn strchr 54function locates the first occurrence of the character 55.Fa c 56in the string 57.Fa s . 58The terminating NUL character is considered part of the string. 59If 60.Fa c 61is 62.Ql \e0 , 63.Fn strchr 64locates the terminating 65.Ql \e0 . 66.Pp 67The 68.Fn index 69function is an old synonym for 70.Fn strchr . 71.Sh RETURN VALUES 72The 73.Fn strchr 74function returns a pointer to the located character or 75.Dv NULL 76if the character does not appear in the string. 77.Sh EXAMPLES 78After the following call to 79.Fn strchr , 80.Va p 81will point to the string 82.Qq oobar : 83.Bd -literal -offset indent 84char *p; 85char *s = "foobar"; 86 87p = strchr(s, 'o'); 88.Ed 89.Sh SEE ALSO 90.Xr memchr 3 , 91.Xr strcspn 3 , 92.Xr strpbrk 3 , 93.Xr strrchr 3 , 94.Xr strsep 3 , 95.Xr strspn 3 , 96.Xr strstr 3 , 97.Xr strtok 3 98.Sh STANDARDS 99The 100.Fn strchr 101function conforms to 102.St -ansiC . 103.Pp 104The 105.Fn index 106function is deprecated and shouldn't be used in new code. 107