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/* $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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