From 361b515d590f3c2f44c93914f1107b897a05aa3e Mon Sep 17 00:00:00 2001
From: yasuoka <>
Date: Sun, 25 May 2025 05:32:45 +0000
Subject: Add test for ungetwc().

---
 src/regress/lib/libc/stdio/test_ungetwc.c | 90 +++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/regress/lib/libc/stdio/test_ungetwc.c

(limited to 'src/regress/lib/libc/stdio/test_ungetwc.c')

diff --git a/src/regress/lib/libc/stdio/test_ungetwc.c b/src/regress/lib/libc/stdio/test_ungetwc.c
new file mode 100644
index 0000000000..bb4e853020
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test_ungetwc.c
@@ -0,0 +1,90 @@
+/*	$OpenBSD: test_ungetwc.c,v 1.1 2025/05/25 05:32:45 yasuoka Exp $	*/
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <locale.h>
+#include <wchar.h>
+
+/* we use assert() */
+#undef	NDEBUG
+
+#define	TMPFILENAME	"test_ungetwc.tmp"
+
+void setupw(void);
+void test_fflush_ungetwc0(void);
+
+void
+setupw(void)
+{
+	FILE	*fp;
+
+	/* common setup */
+	unlink(TMPFILENAME);
+	fp = fopen(TMPFILENAME, "w+");
+	assert(fp != NULL);
+	/* Konnitiwa Sekai(in Kanji) */
+	fputws(L"\u3053\u3093\u306b\u3061\u308f \u4e16\u754c\n", fp);
+	fclose(fp);
+}
+
+/* fflush work with reading file and seekable + ungetwc */
+void
+test_fflush_ungetwc0(void)
+{
+	int	 r;
+	wchar_t	 buf[80];
+	FILE	*fp;
+
+	setupw();
+
+	fp = fopen(TMPFILENAME, "r");
+
+	assert(fp != NULL);
+	assert(fgetwc(fp) == L'\u3053');	/* Ko */
+	assert(fgetwc(fp) == L'\u3093');	/* N  */
+	assert(fgetwc(fp) == L'\u306b');	/* Ni */
+	assert(fgetwc(fp) == L'\u3061');	/* Ti */
+	assert(fgetwc(fp) == L'\u308f');	/* Wa */
+
+	/* push 263A(smile) back */
+	assert(ungetwc(L'\u263a', fp));
+
+	/* we support 1 push back wchar_t */
+	assert(fgetwc(fp) == L'\u263a');
+
+	/* can read reset of that */
+	fgetws(buf, sizeof(buf), fp);
+	assert(wcscmp(buf, L" \u4e16\u754c\n") == 0);
+
+	r = fclose(fp);
+	assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "C.UTF-8");
+
+	test_fflush_ungetwc0();
+
+	exit(0);
+}
-- 
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