1.\" $OpenBSD: strrchr.3,v 1.12 2018/10/01 06:37:37 martijn Exp $ 2.\" 3.\" Copyright (c) 1990, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Chris Torek and the American National Standards Committee X3, 8.\" on Information Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: October 1 2018 $ 35.Dt STRRCHR 3 36.Os 37.Sh NAME 38.Nm strrchr , 39.Nm rindex 40.Nd locate last occurrence of a character in a string 41.Sh SYNOPSIS 42.In string.h 43.Ft char * 44.Fn strrchr "const char *s" "int c" 45.In strings.h 46.Ft char * 47.Fn rindex "const char *s" "int c" 48.Sh DESCRIPTION 49The 50.Fn strrchr 51function locates the last occurrence of the character 52.Fa c 53.Pq converted to a char 54in the string 55.Fa s . 56The terminating 57.Tn NUL 58character is considered part of the string. 59If 60.Fa c 61is 62.Ql \e0 , 63.Fn strrchr 64locates the terminating 65.Ql \e0 . 66.Pp 67The 68.Fn rindex 69function is an old synonym for 70.Fn strrchr . 71.Sh RETURN VALUES 72The 73.Fn strrchr 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 strrchr , 80.Va p 81will point to the string 82.Qq obar : 83.Bd -literal -offset indent 84char *p; 85char *s = "foobar"; 86 87p = strrchr(s, 'o'); 88.Ed 89.Sh SEE ALSO 90.Xr memchr 3 , 91.Xr strchr 3 , 92.Xr strcspn 3 , 93.Xr strpbrk 3 , 94.Xr strsep 3 , 95.Xr strspn 3 , 96.Xr strstr 3 , 97.Xr strtok 3 , 98.Xr wcsrchr 3 99.Sh STANDARDS 100The 101.Fn strrchr 102function conforms to 103.St -ansiC . 104.Pp 105The 106.Fn rindex 107function is deprecated and shouldn't be used in new code. 108.Sh HISTORY 109The 110.Fn rindex 111function first appeared in 112.At v7 . 113The 114.Fn strrchr 115function first appeared in 116.At III 117and was reimplemented for 118.Bx 4.3 Tahoe . 119