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.\" @(#)strcasecmp.3 8.1 (Berkeley) 6/9/93 35.\" 36.Dd June 9, 1993 37.Dt STRCASECMP 3 38.Os 39.Sh NAME 40.Nm strcasecmp , 41.Nm strncasecmp 42.Nd compare strings, ignoring case 43.Sh SYNOPSIS 44.Fd #include <string.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 59and return an integer greater than, equal to, or less than 0, 60according as 61.Fa s1 62is lexicographically greater than, equal to, or less than 63.Fa s2 64after translation of each corresponding character to lower-case. 65The strings themselves are not modified. 66The comparison is done using unsigned characters, so that 67.Sq Li \e200 68is greater than 69.Ql \e0 . 70.Pp 71The 72.Fn strncasecmp 73compares at most 74.Fa len 75characters. 76.Sh SEE ALSO 77.Xr bcmp 3 , 78.Xr memcmp 3 , 79.Xr strcmp 3 , 80.Xr strcoll 3 , 81.Xr strxfrm 3 82.Sh HISTORY 83The 84.Fn strcasecmp 85and 86.Fn strncasecmp 87functions first appeared in 88.Bx 4.4 . 89