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: @(#)strchr.3 8.2 (Berkeley) 4/19/94 33.\" $NetBSD: strchr.3,v 1.15 2023/01/31 01:42:32 simonb Exp $ 34.\" 35.Dd November 27, 2020 36.Dt STRCHR 3 37.Os 38.Sh NAME 39.Nm strchr, strchrnul 40.Nd locate character in string 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In string.h 45.Ft char * 46.Fn strchr "const char *s" "int c" 47.Ft char * 48.Fn strchrnul "const char *s" "int c" 49.Sh DESCRIPTION 50The 51.Fn strchr 52and 53.Fn strchrnul 54functions locate the first occurrence of 55.Ar c 56in the string pointed to by 57.Ar s . 58The terminating 59.Dv NUL 60character is considered part of the string. 61If 62.Fa c 63is 64.Ql \e0 , 65.Fn strchr 66and 67.Fn strchrnul 68locate the terminating 69.Ql \e0 . 70.Sh RETURN VALUES 71The function 72.Fn strchr 73returns a pointer to the located character, or 74.Dv NULL 75if the character does not appear in the string. 76The function 77.Fn strchrnul 78returns a pointer to the located character, or 79a pointer to the 80.Dv NUL 81terminating character of the string if the character does not appear 82in the string. 83.Sh EXAMPLES 84After the following call to 85.Fn strchr , 86.Va p 87will point to the string 88.Qq oobar : 89.Bd -literal -offset indent 90char *p; 91char *s = "foobar"; 92 93p = strchr(s, 'o'); 94.Ed 95.Sh SEE ALSO 96.Xr index 3 , 97.Xr memchr 3 , 98.Xr rindex 3 , 99.Xr strcspn 3 , 100.Xr strpbrk 3 , 101.Xr strrchr 3 , 102.Xr strsep 3 , 103.Xr strspn 3 , 104.Xr strstr 3 , 105.Xr strtok 3 106.Sh STANDARDS 107The 108.Fn strchr 109function 110conforms to 111.St -ansiC . 112.Sh HISTORY 113The 114.Fn strchrnul 115first appeared in glibc 2.1.1 and was added to 116.Fx 10 117and 118.Nx 8 . 119