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.\" 4. 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.\" $FreeBSD$ 32.\" 33.Dd June 9, 1993 34.Dt STRCASECMP 3 35.Os 36.Sh NAME 37.Nm strcasecmp , 38.Nm strncasecmp 39.Nd compare strings, ignoring case 40.Sh LIBRARY 41.Lb libc 42.Sh SYNOPSIS 43.In strings.h 44.Ft int 45.Fn strcasecmp "const char *s1" "const char *s2" 46.Ft int 47.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 48.Sh DESCRIPTION 49The 50.Fn strcasecmp 51and 52.Fn strncasecmp 53functions 54compare the null-terminated strings 55.Fa s1 56and 57.Fa s2 . 58.Pp 59The 60.Fn strncasecmp 61compares at most 62.Fa len 63characters. 64.Sh RETURN VALUES 65The 66.Fn strcasecmp 67and 68.Fn strncasecmp 69return an integer greater than, equal to, or less than 0, 70according as 71.Fa s1 72is lexicographically greater than, equal to, or less than 73.Fa s2 74after translation of each corresponding character to lower-case. 75The strings themselves are not modified. 76The comparison is done using unsigned characters, so that 77.Sq Li \e200 78is greater than 79.Ql \e0 . 80.Sh SEE ALSO 81.Xr bcmp 3 , 82.Xr memcmp 3 , 83.Xr strcmp 3 , 84.Xr strcoll 3 , 85.Xr strxfrm 3 , 86.Xr tolower 3 87.Sh HISTORY 88The 89.Fn strcasecmp 90and 91.Fn strncasecmp 92functions first appeared in 93.Bx 4.4 . 94Their prototypes existed previously in 95.In string.h 96before they were moved to 97.In strings.h 98for 99.St -p1003.1-2001 100compliance. 101