1.\" $OpenBSD: strcasecmp.3,v 1.12 2013/06/05 03:39:23 tedu Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Chris Torek. 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.\" @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 33.\" 34.Dd $Mdocdate: June 5 2013 $ 35.Dt STRCASECMP 3 36.Os 37.Sh NAME 38.Nm strcasecmp , 39.Nm strncasecmp 40.Nd compare strings, ignoring case 41.Sh SYNOPSIS 42.In string.h 43.Ft int 44.Fn strcasecmp "const char *s1" "const char *s2" 45.Ft int 46.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 47.Sh DESCRIPTION 48The 49.Fn strcasecmp 50and 51.Fn strncasecmp 52functions compare the NUL-terminated strings 53.Fa s1 54and 55.Fa s2 56and return an integer greater than, equal to, or less than 0, 57according to whether 58.Fa s1 59is lexicographically greater than, equal to, or less than 60.Fa s2 61after translation of each corresponding character to lower-case. 62The strings themselves are not modified. 63The comparison is done using unsigned characters, so that 64.Sq Li \e200 65is greater than 66.Ql \e0 . 67.Pp 68.Fn strncasecmp 69compares at most 70.Fa len 71characters. 72.Sh SEE ALSO 73.Xr bcmp 3 , 74.Xr memcmp 3 , 75.Xr strcmp 3 , 76.Xr strcoll 3 , 77.Xr strxfrm 3 , 78.Xr wcscasecmp 3 79.Sh STANDARDS 80The 81.Fn strcasecmp 82and 83.Fn strncasecmp 84functions conform to 85.St -p1003.1-2008 . 86.Sh HISTORY 87The 88.Fn strcasecmp 89and 90.Fn strncasecmp 91functions first appeared in 92.Bx 4.3 Tahoe . 93