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/* Test of fgetc() function.
Copyright (C) 2011-2022 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, 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/>. */
#include <config.h>
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (fgetc, int, (FILE *));
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
# include "msvc-inval.h"
#endif
#include "macros.h"
int
main (int argc, char **argv)
{
const char *filename = "test-fgetc.txt";
/* We don't have an fgetc() function that installs an invalid parameter
handler so far. So install that handler here, explicitly. */
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
&& MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
gl_msvc_inval_ensure_handler ();
#endif
/* Prepare a file. */
{
const char text[] = "hello world";
int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
ASSERT (fd >= 0);
ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
ASSERT (close (fd) == 0);
}
/* Test that fgetc() sets errno if someone else closes the stream
fd behind the back of stdio. */
{
FILE *fp = fopen (filename, "r");
ASSERT (fp != NULL);
ASSERT (close (fileno (fp)) == 0);
errno = 0;
ASSERT (fgetc (fp) == EOF);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
/* Test that fgetc() sets errno if the stream was constructed with
an invalid file descriptor. */
{
FILE *fp = fdopen (-1, "r");
if (fp != NULL)
{
errno = 0;
ASSERT (fgetc (fp) == EOF);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
}
{
FILE *fp;
close (99);
fp = fdopen (99, "r");
if (fp != NULL)
{
errno = 0;
ASSERT (fgetc (fp) == EOF);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
}
/* Clean up. */
unlink (filename);
return 0;
}
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