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/* $OpenBSD: test___freadahead.c,v 1.2 2025/06/03 14:35:27 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 <errno.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
/* we use assert() */
#undef NDEBUG
#define TMPFILENAME "test___freadahead.tmp"
void test___freadahead0(void);
void
test___freadahead0(void)
{
FILE *fp;
int r;
size_t s;
fp = fopen(TMPFILENAME, "w");
assert(fp != NULL);
r = fputs("Hello world", fp);
assert(r >= 0);
r = fclose(fp);
fp = fopen(TMPFILENAME, "r");
s = __freadahead(fp);
assert(s == 0);
assert(fgetc(fp) == 'H');
s = __freadahead(fp);
assert(s == 10);
r = fflush(fp);
#if 0
/* fflush() to reading file is not supported (yet) */
assert(errno == EBADF);
#else
assert(r == 0);
s = __freadahead(fp);
assert(s == 0);
#endif
r = fclose(fp);
assert(r == 0);
}
int
main(int argc, char *argv[])
{
test___freadahead0();
exit(0);
}
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