Implement rpmatch(), a semi-standard interface (as found on AIX, Tru64,

GNU) for determining whether a string is an affirmative or negative
response to a question according to the current locale. This is done
by matching the response against nl_langinfo(3) items YESEXPR and NOEXPR.

include/stdlib.h

@@ -263,6 +263,7 @@ void	 qsort_r(void *, size_t, size_t, void *,
 int	 radixsort(const unsigned char **, int, const unsigned char *,
 	    unsigned);
 void    *reallocf(void *, size_t);
+int	 rpmatch(const char *);
 void	 setprogname(const char *);
 int	 sradixsort(const unsigned char **, int, const unsigned char *,
 	    unsigned);

lib/libc/locale/Makefile.inc

@@ -10,7 +10,8 @@ SRCS+=	big5.c btowc.c collate.c collcmp.c euc.c fix_grouping.c \
 	mbrlen.c \
 	mbrtowc.c mbsinit.c mbsnrtowcs.c \
 	mbsrtowcs.c mbtowc.c mbstowcs.c \
-	mskanji.c nextwctype.c nl_langinfo.c nomacros.c none.c rune.c \
+	mskanji.c nextwctype.c nl_langinfo.c nomacros.c none.c rpmatch.c \
+	rune.c \
 	runetype.c setlocale.c setrunelocale.c \
 	table.c \
 	tolower.c toupper.c utf8.c wcrtomb.c wcsnrtombs.c \
@@ -29,7 +30,7 @@ MAN+=	btowc.3 \
 	mbrtowc.3 \
 	mbsinit.3 \
 	mbsrtowcs.3 mbstowcs.3 mbtowc.3 multibyte.3 \
-	nextwctype.3 nl_langinfo.3 \
+	nextwctype.3 nl_langinfo.3 rpmatch.3 \
 	setlocale.3 toascii.3 tolower.3 toupper.3 towlower.3 towupper.3 \
 	wcsftime.3 \
 	wcrtomb.3 \

lib/libc/locale/rpmatch.3

@@ -0,0 +1,63 @@
+.\"
+.\" Copyright (c) 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 6, 2005
+.Dt RPMATCH 3
+.Os
+.Sh NAME
+.Nm rpmatch
+.Nd "determine whether the response to a question is affirmative or negative"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft int
+.Fo rpmatch
+.Fa "const char *response"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn rpmatch
+function determines whether the
+.Fa response
+argument is an affirmative or negative response to a question
+according to the current locale.
+.Sh RETURN VALUES
+The
+.Fn rpmatch
+functions returns:
+.Bl -tag -width indent
+.It 1
+The response is affirmative.
+.It 0
+The response is negative.
+.It \&-1
+The response is not recognized.
+.El
+.Sh SEE ALSO
+.Xr nl_langinfo 3 ,
+.Xr setlocale 3

lib/libc/locale/rpmatch.c

@@ -0,0 +1,55 @@
+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#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);
+}