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: head/lib/libc/string/strcasecmp.3 251069 2013-05-28 20:57:40Z emaste $ 32.\" 33.Dd December 25, 2013 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.Ft int 49.Fn strcasecmp_l "const char *s1" "const char *s2" "locale_t locale" 50.Ft int 51.Fn strncasecmp_l "const char *s1" "const char *s2" "size_t len" "locale_t locale" 52.Sh DESCRIPTION 53The 54.Fn strcasecmp , 55.Fn strcasecmp_l , 56.Fn strncasecmp , 57and 58.Fn strncasecmp_l 59functions 60compare the null-terminated strings 61.Fa s1 62and 63.Fa s2 . 64.Pp 65The 66.Fn strncasecmp 67function compares at most 68.Fa len 69characters. 70The 71.Fn strcasecmp_l 72and 73.Fn strncasecmp_l 74functions do the same as their non-locale versions above, but take an 75explicit 76.Fa locale 77rather than using the current locale. 78.Sh RETURN VALUES 79The functions 80.Fn strcasecmp 81and 82.Fn strncasecmp 83return an integer greater than, equal to, or less than 0, 84depending on whether 85.Fa s1 86is lexicographically greater than, equal to, or less than 87.Fa s2 88after translation of each corresponding character to lower-case. 89The strings themselves are not modified. 90The comparison is done using unsigned characters, so that 91.Sq Li \e200 92is greater than 93.Ql \e0 . 94The functions 95.Fn strcasecmp_l 96and 97.Fn strncasecmp_l 98do the same but take explicit locales. 99.Sh SEE ALSO 100.Xr bcmp 3 , 101.Xr memcmp 3 , 102.Xr strcmp 3 , 103.Xr strcoll 3 , 104.Xr strxfrm 3 , 105.Xr tolower 3 , 106.Xr wcscasecmp 3 107.Sh HISTORY 108The 109.Fn strcasecmp 110and 111.Fn strncasecmp 112functions first appeared in 113.Bx 4.4 . 114Their prototypes existed previously in 115.In string.h 116before they were moved to 117.In strings.h 118for 119.St -p1003.1-2001 120compliance. 121.Pp 122The 123.Fn strcasecmp_l 124and 125.Fn strncasecmp_l 126functions conform to 127.St -p1003.1-2008 . 128