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/*
FUNCTION
<<rpmatch>>---determine whether response to question is affirmative or negative
INDEX
rpmatch
SYNOPSIS
#include <stdlib.h>
int rpmatch(const char *<[response]>);
DESCRIPTION
The <<rpmatch>> function determines whether <[response]> is an affirmative
or negative response to a question according to the current locale.
RETURNS
<<rpmatch>> returns 1 if <[response]> is affirmative, 0 if negative, or -1
if not recognized as either.
PORTABILITY
<<rpmatch>> is a BSD extension also found in glibc.
NOTES
No supporting OS subroutines are required.
*/
/* This code is originally taken from FreeBSD. */
/*-
* Copyright (c) 2004-2005 Tim J. Robbins.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <langinfo.h>
#include <regex.h>
#include <stdlib.h>
int
rpmatch (const char *response)
{
regex_t yes, no;
int ret;
if (regcomp(&yes, nl_langinfo(YESEXPR), REG_EXTENDED|REG_NOSUB) != 0)
return (-1);
if (regcomp(&no, nl_langinfo(NOEXPR), REG_EXTENDED|REG_NOSUB) != 0) {
regfree(&yes);
return (-1);
}
if (regexec(&yes, response, 0, NULL, 0) == 0)
ret = 1;
else if (regexec(&no, response, 0, NULL, 0) == 0)
ret = 0;
else
ret = -1;
regfree(&yes);
regfree(&no);
return (ret);
}
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