1.\" $OpenBSD: strcasecmp.3,v 1.3 1997/08/20 04:13:56 millert 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. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 37.\" 38.Dd June 9, 1993 39.Dt STRCASECMP 3 40.Os 41.Sh NAME 42.Nm strcasecmp 43.Nd compare strings, ignoring case 44.Sh SYNOPSIS 45.Fd #include <string.h> 46.Ft int 47.Fn strcasecmp "const char *s1" "const char *s2" 48.Ft int 49.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 50.Sh DESCRIPTION 51The 52.Fn strcasecmp 53and 54.Fn strncasecmp 55functions 56compare the null-terminated strings 57.Fa s1 58and 59.Fa s2 60and return an integer greater than, equal to, or less than 0, 61according as 62.Fa s1 63is lexicographically greater than, equal to, or less than 64.Fa s2 65after translation of each corresponding character to lower-case. 66The strings themselves are not modified. 67The comparison is done using unsigned characters, so that 68.Sq Li \e200 69is greater than 70.Ql \e0 . 71.Pp 72The 73.Fn strncasecmp 74compares at most 75.Fa len 76characters. 77.Sh SEE ALSO 78.Xr bcmp 3 , 79.Xr memcmp 3 , 80.Xr strcmp 3 , 81.Xr strcoll 3 , 82.Xr strxfrm 3 83.Sh HISTORY 84The 85.Fn strcasecmp 86and 87.Fn strncasecmp 88functions first appeared in 4.4BSD. 89