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.\" from: @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 35.\" $NetBSD: strcasecmp.3,v 1.13 2002/02/07 07:00:32 ross Exp $ 36.\" 37.Dd June 9, 1993 38.Dt STRCASECMP 3 39.Os 40.Sh NAME 41.Nm strcasecmp , 42.Nm strncasecmp 43.Nd compare strings, ignoring case 44.Sh LIBRARY 45.Lb libc 46.Sh SYNOPSIS 47.Fd #include \*[Lt]strings.h\*[Gt] 48.Ft int 49.Fn strcasecmp "const char *s1" "const char *s2" 50.Ft int 51.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 52.Sh DESCRIPTION 53The 54.Fn strcasecmp 55and 56.Fn strncasecmp 57functions 58compare the null-terminated strings 59.Fa s1 60and 61.Fa s2 62and return an integer greater than, equal to, or less than 0, 63according as 64.Fa s1 65is lexicographically greater than, equal to, or less than 66.Fa s2 67after translation of each corresponding character to lower-case. 68The strings themselves are not modified. 69The comparison is done using unsigned characters, so that 70.Sq Li \e200 71is greater than 72.Ql \e0 . 73.Pp 74The 75.Fn strncasecmp 76compares at most 77.Fa len 78characters. 79.Sh SEE ALSO 80.Xr bcmp 3 , 81.Xr memcmp 3 , 82.Xr strcmp 3 , 83.Xr strcoll 3 , 84.Xr strxfrm 3 85.Sh HISTORY 86The 87.Fn strcasecmp 88and 89.Fn strncasecmp 90functions first appeared in 91.Bx 4.4 . 92.Sh NOTES 93If 94.Fa len 95is zero 96.Fn strncasecmp 97returns always 0. 98