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. 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. 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.\" @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 35.\" $FreeBSD: src/lib/libc/string/strcasecmp.3,v 1.6.2.3 2001/12/14 18:33:59 ru Exp $ 36.\" $DragonFly: src/lib/libc/string/strcasecmp.3,v 1.2 2003/06/17 04:26:46 dillon Exp $ 37.\" 38.Dd June 9, 1993 39.Dt STRCASECMP 3 40.Os 41.Sh NAME 42.Nm strcasecmp , 43.Nm strncasecmp 44.Nd compare strings, ignoring case 45.Sh LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.In string.h 49.Ft int 50.Fn strcasecmp "const char *s1" "const char *s2" 51.Ft int 52.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 53.Sh DESCRIPTION 54The 55.Fn strcasecmp 56and 57.Fn strncasecmp 58functions 59compare the null-terminated strings 60.Fa s1 61and 62.Fa s2 . 63.Pp 64The 65.Fn strncasecmp 66compares at most 67.Fa len 68characters. 69.Sh RETURN VALUES 70The 71.Fn strcasecmp 72and 73.Fn strncasecmp 74return an integer greater than, equal to, or less than 0, 75according as 76.Fa s1 77is lexicographically greater than, equal to, or less than 78.Fa s2 79after translation of each corresponding character to lower-case. 80The strings themselves are not modified. 81The comparison is done using unsigned characters, so that 82.Sq Li \e200 83is greater than 84.Ql \e0 . 85.Sh SEE ALSO 86.Xr bcmp 3 , 87.Xr memcmp 3 , 88.Xr strcmp 3 , 89.Xr strcoll 3 , 90.Xr strxfrm 3 , 91.Xr tolower 3 92.Sh HISTORY 93The 94.Fn strcasecmp 95and 96.Fn strncasecmp 97functions first appeared in 98.Bx 4.4 . 99