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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 31.\" $FreeBSD: src/lib/libc/string/strcasecmp.3,v 1.12 2007/01/09 00:28:12 imp Exp $ 32.\" $DragonFly: src/lib/libc/string/strcasecmp.3,v 1.2 2003/06/17 04:26:46 dillon Exp $ 33.\" 34.Dd June 9, 1993 35.Dt STRCASECMP 3 36.Os 37.Sh NAME 38.Nm strcasecmp , 39.Nm strncasecmp 40.Nd compare strings, ignoring case 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In strings.h 45.Ft int 46.Fn strcasecmp "const char *s1" "const char *s2" 47.Ft int 48.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 49.Sh DESCRIPTION 50The 51.Fn strcasecmp 52and 53.Fn strncasecmp 54functions 55compare the null-terminated strings 56.Fa s1 57and 58.Fa s2 . 59.Pp 60The 61.Fn strncasecmp 62compares at most 63.Fa len 64characters. 65.Sh RETURN VALUES 66The 67.Fn strcasecmp 68and 69.Fn strncasecmp 70return an integer greater than, equal to, or less than 0, 71according as 72.Fa s1 73is lexicographically greater than, equal to, or less than 74.Fa s2 75after translation of each corresponding character to lower-case. 76The strings themselves are not modified. 77The comparison is done using unsigned characters, so that 78.Sq Li \e200 79is greater than 80.Ql \e0 . 81.Sh SEE ALSO 82.Xr bcmp 3 , 83.Xr memcmp 3 , 84.Xr strcmp 3 , 85.Xr strcoll 3 , 86.Xr strxfrm 3 , 87.Xr tolower 3 88.Sh HISTORY 89The 90.Fn strcasecmp 91and 92.Fn strncasecmp 93functions first appeared in 94.Bx 4.4 . 95Their prototypes existed previously in 96.In string.h 97before they were moved to 98.In strings.h 99for 100.St -p1003.1-2001 101compliance. 102