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/* Test of freading() function.
Copyright (C) 2007-2009 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 <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
#include "freading.h"
#include <stdio.h>
#include <stdlib.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. */
#if !GNULIB_FSEEK
# undef fseek
#endif
#define ASSERT(expr) \
do \
{ \
if (!(expr)) \
{ \
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
fflush (stderr); \
abort (); \
} \
} \
while (0)
#define TESTFILE "t-freading.tmp"
int
main (void)
{
FILE *fp;
/* Create a file with some contents. Write-only file is never reading. */
fp = fopen (TESTFILE, "w");
if (fp == NULL)
goto skip;
ASSERT (!freading (fp));
if (fwrite ("foobarsh", 1, 8, fp) < 8)
goto skip;
ASSERT (!freading (fp));
if (fclose (fp))
goto skip;
/* Open it in read-only mode. Read-only file is always reading. */
fp = fopen (TESTFILE, "r");
if (fp == NULL)
goto skip;
ASSERT (freading (fp));
if (fgetc (fp) != 'f')
goto skip;
ASSERT (freading (fp));
if (fseek (fp, 2, SEEK_CUR))
goto skip;
ASSERT (freading (fp));
if (fgetc (fp) != 'b')
goto skip;
ASSERT (freading (fp));
fflush (fp);
ASSERT (freading (fp));
if (fgetc (fp) != 'a')
goto skip;
ASSERT (freading (fp));
if (fseek (fp, 0, SEEK_END))
goto skip;
ASSERT (freading (fp));
if (fclose (fp))
goto skip;
/* Open it in read-write mode. POSIX requires a reposition (fseek,
fsetpos, rewind) or EOF when transitioning from read to write;
freading is only deterministic after input or output, but this
test case should be portable even on open, after reposition, and
at EOF. */
/* First a scenario with only fgetc, fseek, fputc. */
fp = fopen (TESTFILE, "r+");
if (fp == NULL)
goto skip;
ASSERT (!freading (fp));
if (fgetc (fp) != 'f')
goto skip;
ASSERT (freading (fp));
if (fseek (fp, 2, SEEK_CUR))
goto skip;
/* freading (fp) is undefined here, but fwriting (fp) is false. */
if (fgetc (fp) != 'b')
goto skip;
ASSERT (freading (fp));
/* This fseek call is necessary when switching from reading to writing.
See the description of fopen(), ISO C 99 7.19.5.3.(6). */
if (fseek (fp, 0, SEEK_CUR) != 0)
goto skip;
/* freading (fp) is undefined here, but fwriting (fp) is false. */
if (fputc ('x', fp) != 'x')
goto skip;
ASSERT (!freading (fp));
if (fseek (fp, 0, SEEK_END))
goto skip;
/* freading (fp) is undefined here, because on some implementations (e.g.
glibc) fseek causes a buffer to be read.
fwriting (fp) is undefined as well. */
if (fclose (fp))
goto skip;
/* Open it in read-write mode. POSIX requires a reposition (fseek,
fsetpos, rewind) or EOF when transitioning from read to write;
freading is only deterministic after input or output, but this
test case should be portable even on open, after reposition, and
at EOF. */
/* Here a scenario that includes fflush. */
fp = fopen (TESTFILE, "r+");
if (fp == NULL)
goto skip;
ASSERT (!freading (fp));
if (fgetc (fp) != 'f')
goto skip;
ASSERT (freading (fp));
if (fseek (fp, 2, SEEK_CUR))
goto skip;
/* freading (fp) is undefined here, but fwriting (fp) is false. */
if (fgetc (fp) != 'b')
goto skip;
ASSERT (freading (fp));
fflush (fp);
/* freading (fp) is undefined here, but fwriting (fp) is false. */
if (fgetc (fp) != 'x')
goto skip;
ASSERT (freading (fp));
/* This fseek call is necessary when switching from reading to writing.
See the description of fopen(), ISO C 99 7.19.5.3.(6). */
if (fseek (fp, 0, SEEK_CUR) != 0)
goto skip;
/* freading (fp) is undefined here, but fwriting (fp) is false. */
if (fputc ('z', fp) != 'z')
goto skip;
ASSERT (!freading (fp));
if (fseek (fp, 0, SEEK_END))
goto skip;
/* freading (fp) is undefined here, because on some implementations (e.g.
glibc) fseek causes a buffer to be read.
fwriting (fp) is undefined as well. */
if (fclose (fp))
goto skip;
/* Open it in append mode. Write-only file is never reading. */
fp = fopen (TESTFILE, "a");
if (fp == NULL)
goto skip;
ASSERT (!freading (fp));
if (fwrite ("bla", 1, 3, fp) < 3)
goto skip;
ASSERT (!freading (fp));
if (fclose (fp))
goto skip;
return 0;
skip:
fprintf (stderr, "Skipping test: file operations failed.\n");
return 77;
}
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