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.\" 4. 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.\" @(#)strchr.3 8.2 (Berkeley) 4/19/94 33.\" $FreeBSD$ 34.\" 35.Dd February 13, 2013 36.Dt STRCHR 3 37.Os 38.Sh NAME 39.Nm strchr , strrchr , 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 strrchr "const char *s" "int c" 49.Ft "char *" 50.Fn strchrnul "const char *s" "int c" 51.Sh DESCRIPTION 52The 53.Fn strchr 54function locates the first occurrence of 55.Fa c 56(converted to a 57.Vt char ) 58in the string pointed to by 59.Fa s . 60The terminating null character is considered part of the string; 61therefore if 62.Fa c 63is 64.Ql \e0 , 65the functions locate the terminating 66.Ql \e0 . 67.Pp 68The 69.Fn strrchr 70function is identical to 71.Fn strchr 72except it locates the last occurrence of 73.Fa c . 74.Pp 75The 76.Fn strchrnul 77function is identical to 78.Fn strchr 79except that if 80.Fa c 81is not found in 82.Fa s 83a pointer to the terminating 84.Ql \e0 85is returned. 86.Sh RETURN VALUES 87The functions 88.Fn strchr 89and 90.Fn strrchr 91return a pointer to the located character, or 92.Dv NULL 93if the character does not appear in the string. 94.Pp 95.Fn strchrnul 96returns a pointer to the terminating 97.Ql \e0 98if the character does not appear in the string. 99.Sh SEE ALSO 100.Xr memchr 3 , 101.Xr memmem 3 , 102.Xr strcspn 3 , 103.Xr strpbrk 3 , 104.Xr strsep 3 , 105.Xr strspn 3 , 106.Xr strstr 3 , 107.Xr strtok 3 , 108.Xr wcschr 3 109.Sh STANDARDS 110The functions 111.Fn strchr 112and 113.Fn strrchr 114conform to 115.St -isoC . 116The 117.Fn strchrnul 118is a GNU extension . 119.Sh History 120The 121.Fn strchrnul 122function first appeared in glibc 2.1.1 and was added in 123.Fx 10.0 . 124