/usr/share/calc/help/strncasecmp is in apcalc-common 2.12.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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strncasecmp - compare two strings up to n characters, case independent
SYNOPSIS
strncasecmp(s1, s2, n)
TYPES
s1 string
s2 string
n nonnegative integer
return integer (1, 0 or -1)
DESCRIPTION
Let n1 = size(s1), n2 = size(s2) and m = min(n1, n2, n).
This function compares up to m values of consecutive characters
in the strings s1 and s2. If an inequality is encountered, the
function returns 1 or -1 according as the greater character is
in s1 or s2. If there has been no inequality, the function
returns 1, 0, or -1 according as min(n1, n) is greater than, equal
to, or less than min(n2, n); in particular, if n1 and n2 are
both greater than equal to n, 0 is returned.
This function is case independent.
EXAMPLE
strncasecmp("abc", "xyz", 0) == 0
strncasecmp("abc", "xyz", 1) == -1
strncasecmp("abc", "", 1) == 1
strncasecmp("a", "b", 2) == -1
strncasecmp("ab", "Ac", 2) == -1
strncasecmp("\0ac", "\0b", 2) == -1
strncasecmp("ab", "aBc", 2) == 0
strncasecmp("abc", "abd", 2) == 0
LIMITS
none
LINK LIBRARY
This function uses FLAG stringcaserel(STRING *s1, STRING *s2),
temporarily replacing the string sizes by min(n1,n) and min(n2,n).
SEE ALSO
strcat, strcpy, strerror, strlen, strncpy, strpos, strcasecmp
strprintf, strscan, strscanf, substr
## Copyright (C) 2013 Christoph Zurnieden
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.3 $
## @(#) $Id: strncasecmp,v 30.3 2013/09/01 20:08:38 chongo Exp $
## @(#) $Source: /usr/local/src/bin/calc/help/RCS/strncasecmp,v $
##
## Under source code control: 2013/09/01 20:04:02
## File existed as early as: 2013
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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