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/* $OpenBSD: test___fwriting.c,v 1.1 2025/05/25 00:20:54 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 <stdio_ext.h>
#include <stdlib.h>
/* we use assert() */
#undef NDEBUG
#define TMPFILENAME "test___fwriting.tmp"
void test___fwriting0(void);
void test___fwriting1(void);
void
test___fwriting0(void)
{
FILE *fp;
int r;
fp = fopen(TMPFILENAME, "w"); /* write only */
assert(fp != NULL);
assert(__fwriting(fp) != 0); /* writing is true immediately */
r = fputs("Hello world\n", fp);
assert(r >= 0);
r = fclose(fp);
assert(r == 0);
fp = fopen(TMPFILENAME, "a"); /* append only */
assert(fp != NULL);
assert(__fwriting(fp) != 0); /* writing immediately */
r = fclose(fp);
assert(r == 0);
}
void
test___fwriting1(void)
{
FILE *fp;
int r;
fp = fopen(TMPFILENAME, "w+"); /* read / write */
assert(fp != NULL);
r = fputs("Hello world\n", fp);
assert(r >= 0);
assert(__fwriting(fp) != 0);
rewind(fp);
assert(fgetc(fp) == 'H'); /* read */
assert(__fwriting(fp) == 0); /* writing becomes false */
fputc('e', fp);
assert(__fwriting(fp) != 0); /* writing becomes true */
ungetc('e', fp);
assert(__fwriting(fp) == 0); /* ungetc -> writing becomes false */
r = fclose(fp);
assert(r == 0);
}
int
main(int argc, char *argv[])
{
test___fwriting0();
test___fwriting1();
exit(0);
}
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