obstack-zprintf-gnu: Add tests.

* tests/test-obstack-zprintf-gnu.c: New file, based on
tests/test-vazsprintf-gnu.c.
* modules/obstack-zprintf-gnu-tests: New file.

ChangeLog

@@ -1,5 +1,10 @@
 2024-06-25  Bruno Haible  <bruno@clisp.org>
 
+	obstack-zprintf-gnu: Add tests.
+	* tests/test-obstack-zprintf-gnu.c: New file, based on
+	tests/test-vazsprintf-gnu.c.
+	* modules/obstack-zprintf-gnu-tests: New file.
+
 	obstack-zprintf-gnu: New module.
 	* modules/obstack-zprintf-gnu: New file.
 

modules/obstack-zprintf-gnu-tests

@@ -0,0 +1,12 @@
+Files:
+tests/test-obstack-zprintf-gnu.c
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-obstack-zprintf-gnu
+check_PROGRAMS += test-obstack-zprintf-gnu
+test_obstack_zprintf_gnu_LDADD = $(LDADD) @LIBINTL@

tests/test-obstack-zprintf-gnu.c

@@ -0,0 +1,92 @@
+/* Test of POSIX and GNU compatible obstack_[v]zprintf() functions.
+   Copyright (C) 2007-2024 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2024.  */
+
+/* This test exercises only a few POSIX compliance problems that are still
+   visible on platforms relevant in 2024.  */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "obstack.h"
+
+#include "macros.h"
+
+#define obstack_chunk_alloc malloc
+#define obstack_chunk_free free
+
+static void
+test_function (ptrdiff_t (*my_obstack_zprintf) (struct obstack *, const char *, ...))
+{
+  struct obstack obs;
+  obstack_init (&obs);
+
+  #define RESULT_EQ(expected) \
+    (len == strlen (expected) && memcmp (result, expected, len) == 0)
+
+  /* Test the support of the 'B' conversion specifier for binary output of
+     integers.  */
+
+  { /* This test would fail on all platforms other than glibc ≥ 2.35.  */
+    ptrdiff_t len =
+      my_obstack_zprintf (&obs, "%#B %d", 12345, 33, 44, 55);
+    ASSERT (len >= 0);
+    char *result = obstack_finish (&obs);
+    ASSERT (RESULT_EQ ("0B11000000111001 33"));
+    obstack_free (&obs, result);
+  }
+
+  obstack_free (&obs, NULL);
+}
+
+static ptrdiff_t
+my_obstack_zprintf (struct obstack *obs, const char *format, ...)
+{
+  va_list args;
+  ptrdiff_t ret;
+
+  va_start (args, format);
+  ret = obstack_vzprintf (obs, format, args);
+  va_end (args);
+  return ret;
+}
+
+static void
+test_obstack_vzprintf ()
+{
+  test_function (my_obstack_zprintf);
+}
+
+static void
+test_obstack_zprintf ()
+{
+  test_function (obstack_zprintf);
+}
+
+int
+main (int argc, char *argv[])
+{
+  test_obstack_vzprintf ();
+  test_obstack_zprintf ();
+  return test_exit_status;
+}