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/* Test of fwritable() function.
Copyright (C) 2007-2023 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 of the License, 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/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
/* None of the files accessed by this test are large, so disable the
fseek link warning if we are not using the gnulib fseek module. */
#define _GL_NO_LARGE_FILES
#include "fwritable.h"
#include <stdio.h>
#include "macros.h"
#define TESTFILE "t-fwritable.tmp"
int
main ()
{
FILE *fp;
/* Create a file with some contents. */
fp = fopen (TESTFILE, "w");
if (fp == NULL)
goto skip;
ASSERT (fwritable (fp));
if (fwrite ("foobarsh", 1, 8, fp) < 8)
goto skip;
ASSERT (fwritable (fp));
if (fclose (fp))
goto skip;
/* Open it in read-only mode. */
fp = fopen (TESTFILE, "r");
if (fp == NULL)
goto skip;
ASSERT (!fwritable (fp));
if (fgetc (fp) != 'f')
goto skip;
ASSERT (!fwritable (fp));
if (fseek (fp, 2, SEEK_CUR))
goto skip;
ASSERT (!fwritable (fp));
if (fgetc (fp) != 'b')
goto skip;
ASSERT (!fwritable (fp));
fflush (fp);
ASSERT (!fwritable (fp));
if (fgetc (fp) != 'a')
goto skip;
ASSERT (!fwritable (fp));
if (fseek (fp, 0, SEEK_END))
goto skip;
ASSERT (!fwritable (fp));
if (fclose (fp))
goto skip;
/* Open it in read-write mode. */
fp = fopen (TESTFILE, "r+");
if (fp == NULL)
goto skip;
ASSERT (fwritable (fp));
if (fgetc (fp) != 'f')
goto skip;
ASSERT (fwritable (fp));
if (fseek (fp, 2, SEEK_CUR))
goto skip;
ASSERT (fwritable (fp));
if (fgetc (fp) != 'b')
goto skip;
ASSERT (fwritable (fp));
fflush (fp);
ASSERT (fwritable (fp));
if (fgetc (fp) != 'a')
goto skip;
ASSERT (fwritable (fp));
if (fputc ('z', fp) != 'z')
goto skip;
ASSERT (fwritable (fp));
if (fseek (fp, 0, SEEK_END))
goto skip;
ASSERT (fwritable (fp));
if (fclose (fp))
goto skip;
/* Open it in append mode. */
fp = fopen (TESTFILE, "a");
if (fp == NULL)
goto skip;
ASSERT (fwritable (fp));
if (fwrite ("bla", 1, 3, fp) < 3)
goto skip;
ASSERT (fwritable (fp));
if (fclose (fp))
goto skip;
return 0;
skip:
fprintf (stderr, "Skipping test: file operations failed.\n");
return 77;
}
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