strfmon: Add tests for Austin Group Defect 1199

Add tests for The Open Group Base Specifications Issue 8[1], Austin
Group Defect 1199[2].

Items marked with XXX represent an invalid output.  These items will be
fixed in subsequent commits.

Notice that an existing test is now considered invalid.

Our locale definitions do not include int_p_sep_by_space nor
int_n_sep_by_space[3].  Those will be addressed in a subsequent commit.
However, the CLDR project defines them as "0", which causes the output
to appear as "USD123.45".  If our locale definitions were to set the
international {n,p}_sep_by_space to "1", the output would display as the
expected "USD 123.45".

While here, use the SPDX license identifier and add my name to the
file.

[1]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/strfmon.html
[2]: https://www.austingroupbugs.net/view.php?id=1199
[3]: https://unicode-org.atlassian.net/browse/CLDR-237

Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D53911

1 files changed, 57 insertions, 23 deletions

diff --git a/lib/libc/tests/stdlib/strfmon_test.c b/lib/libc/tests/stdlib/strfmon_test.c
index 86f6256dba0b..3c97d61ba82c 100644
--- a/lib/libc/tests/stdlib/strfmon_test.c
+++ b/lib/libc/tests/stdlib/strfmon_test.c
@@ -1,31 +1,14 @@
-/*-
- * Copyright (C) 2018 Conrad Meyer <cem@FreeBSD.org>
+/*
+ * Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
  * All rights reserved.
+ * Copyright (c) 2022-2025 Jose Luis Duran <jlduran@FreeBSD.org>
  *
- * 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.
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include <sys/param.h>
 
+#include <errno.h>
 #include <locale.h>
 #include <monetary.h>
 #include <stdio.h>
@@ -208,6 +191,56 @@ ATF_TC_BODY(strfmon_international_currency_code, tc)
 	}
 }
 
+ATF_TC_WITHOUT_HEAD(strfmon_plus_or_parenthesis);
+ATF_TC_BODY(strfmon_plus_or_parenthesis, tc)
+{
+	const struct {
+		const char *format;
+		const char *locale;
+		const char *expected;
+	} tests[] = {
+	    { "%+n", "en_US.UTF-8", "[$123.45] [-$123.45]" },
+	    { "%+i", "en_US.UTF-8", "[USD123.45] [-USD123.45]" },
+	    { "%(n", "C", "[123.45] [(123.45)]" },
+	    { "%(i", "C", "[123.45] [(123.45)]" },
+	    { "%(n", "en_US.UTF-8", "[$123.45] [($123.45)]" },
+	    { "%(i", "en_US.UTF-8", "[USD123.45] [(USD123.45)]" },
+	    { "%n", "C", "[123.45] [(123.45)]" }, /* XXX */
+	    { "%i", "C", "[123.45] [(123.45)]" }, /* XXX */
+	    { "%n", "en_US.UTF-8", "[$123.45] [-$123.45]" },
+	    { "%i", "en_US.UTF-8", "[USD123.45] [-USD123.45]" },
+	};
+	size_t i;
+	char actual[100], format[50];
+
+	for (i = 0; i < nitems(tests); ++i) {
+		if (setlocale(LC_MONETARY, tests[i].locale) == NULL)
+			atf_tc_skip("unable to setlocale(): %s",
+			    tests[i].locale);
+
+		snprintf(format, sizeof(format), "[%s] [%s]",
+		    tests[i].format, tests[i].format);
+		strfmon(actual, sizeof(actual) - 1, format,
+		    123.45, -123.45);
+		ATF_CHECK_STREQ_MSG(tests[i].expected, actual,
+		    "[%s] %s", tests[i].format, tests[i].locale);
+	}
+
+	/*
+	 * The '+' flag was included in a conversion specification and
+	 * the locale's positive_sign and negative_sign values would
+	 * both be returned by localeconv() as empty strings.
+	 */
+	if (setlocale(LC_MONETARY, "C") == NULL)
+		atf_tc_skip("unable to setlocale(): %s", tests[i].locale);
+
+	/* ATF_CHECK_ERRNO(EINVAL, strfmon(actual, sizeof(actual) - 1,
+	    "[%+n] [%+n]", 123.45, -123.45)); XXX */
+
+	/* ATF_CHECK_ERRNO(EINVAL, strfmon(actual, sizeof(actual) - 1,
+	    "[%+i] [%+i]", 123.45, -123.45)); XXX */
+}
+
 ATF_TC(strfmon_l);
 ATF_TC_HEAD(strfmon_l, tc)
 {
@@ -220,7 +253,7 @@ ATF_TC_BODY(strfmon_l, tc)
 		const char *locale;
 		const char *expected;
 	} tests[] = {
-	    { "C", "[ **1234.57 ] [ **1234.57 ]" },
+	    { "C", "[ **1234.57 ] [ **1234.57 ]" }, /* XXX */
 	    { "de_DE.UTF-8", "[ **1234,57 €] [ **1.234,57 EUR]" },
 	    { "en_GB.UTF-8", "[ £**1234.57] [ GBP**1,234.57]" },
 	};
@@ -247,6 +280,7 @@ ATF_TP_ADD_TCS(tp)
 	ATF_TP_ADD_TC(tp, strfmon_cs_precedes_0);
 	ATF_TP_ADD_TC(tp, strfmon_cs_precedes_1);
 	ATF_TP_ADD_TC(tp, strfmon_international_currency_code);
+	ATF_TP_ADD_TC(tp, strfmon_plus_or_parenthesis);
 	ATF_TP_ADD_TC(tp, strfmon_l);
 	return (atf_no_error());
 }