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