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.\" @(#)strchr.3 8.2 (Berkeley) 4/19/94 33.\" 34.Dd February 13, 2013 35.Dt STRCHR 3 36.Os 37.Sh NAME 38.Nm strchr , strrchr , strchrnul 39.Nd locate character in string 40.Sh LIBRARY 41.Lb libc 42.Sh SYNOPSIS 43.In string.h 44.Ft "char *" 45.Fn strchr "const char *s" "int c" 46.Ft "char *" 47.Fn strrchr "const char *s" "int c" 48.Ft "char *" 49.Fn strchrnul "const char *s" "int c" 50.Sh DESCRIPTION 51The 52.Fn strchr 53function locates the first occurrence of 54.Fa c 55(converted to a 56.Vt char ) 57in the string pointed to by 58.Fa s . 59The terminating null character is considered part of the string; 60therefore if 61.Fa c 62is 63.Ql \e0 , 64the functions locate the terminating 65.Ql \e0 . 66.Pp 67The 68.Fn strrchr 69function is identical to 70.Fn strchr 71except it locates the last occurrence of 72.Fa c . 73.Pp 74The 75.Fn strchrnul 76function is identical to 77.Fn strchr 78except that if 79.Fa c 80is not found in 81.Fa s 82a pointer to the terminating 83.Ql \e0 84is returned. 85.Sh RETURN VALUES 86The functions 87.Fn strchr 88and 89.Fn strrchr 90return a pointer to the located character, or 91.Dv NULL 92if the character does not appear in the string. 93.Pp 94.Fn strchrnul 95returns a pointer to the terminating 96.Ql \e0 97if the character does not appear in the string. 98.Sh SEE ALSO 99.Xr memchr 3 , 100.Xr memmem 3 , 101.Xr strcspn 3 , 102.Xr strpbrk 3 , 103.Xr strsep 3 , 104.Xr strspn 3 , 105.Xr strstr 3 , 106.Xr strtok 3 , 107.Xr wcschr 3 108.Sh STANDARDS 109The functions 110.Fn strchr 111and 112.Fn strrchr 113conform to 114.St -isoC . 115The function 116.Fn strchrnul 117is a 118.Tn GNU 119extension. 120.Sh HISTORY 121The 122.Fn strchrnul 123function first appeared in glibc 2.1.1 and was added in 124.Fx 10.0 . 125