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