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.\" 32.Dd May 29, 2014 33.Dt STRCASECMP 3 34.Os 35.Sh NAME 36.Nm strcasecmp , 37.Nm strncasecmp 38.Nd compare strings, ignoring case 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In strings.h 43.Ft int 44.Fn strcasecmp "const char *s1" "const char *s2" 45.Ft int 46.Fn strncasecmp "const char *s1" "const char *s2" "size_t len" 47.In strings.h 48.In xlocale.h 49.Ft int 50.Fn strcasecmp_l "const char *s1" "const char *s2" "locale_t loc" 51.Ft int 52.Fn strncasecmp_l "const char *s1" "const char *s2" "size_t len" "locale_t loc" 53.Sh DESCRIPTION 54The 55.Fn strcasecmp 56and 57.Fn strncasecmp 58functions 59compare the null-terminated strings 60.Fa s1 61and 62.Fa s2 . 63.Pp 64The 65.Fn strncasecmp 66function compares at most 67.Fa len 68characters. 69The 70.Fn strcasecmp_l 71and 72.Fn strncasecmp_l 73functions do the same as their non-locale versions above, but take an 74explicit locale rather than using the current locale. 75.Sh RETURN VALUES 76The functions 77.Fn strcasecmp 78and 79.Fn strncasecmp 80return an integer greater than, equal to, or less than 0, 81depending on whether 82.Fa s1 83is lexicographically greater than, equal to, or less than 84.Fa s2 85after translation of each corresponding character to lower-case. 86The strings themselves are not modified. 87The comparison is done using unsigned characters, so that 88.Sq Li \e200 89is greater than 90.Ql \e0 . 91The functions 92.Fn strcasecmp_l 93and 94.Fn strncasecmp_l 95do the same but take explicit locales. 96.Sh SEE ALSO 97.Xr bcmp 3 , 98.Xr memcmp 3 , 99.Xr strcmp 3 , 100.Xr strcoll 3 , 101.Xr strxfrm 3 , 102.Xr tolower 3 , 103.Xr wcscasecmp 3 104.Sh HISTORY 105The 106.Fn strcasecmp 107and 108.Fn strncasecmp 109functions first appeared in 110.Bx 4.4 . 111Their prototypes existed previously in 112.In string.h 113before they were moved to 114.In strings.h 115for 116.St -p1003.1-2001 117compliance. 118