/* Test of fpurge() function.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2010 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
-#include "fpurge.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 <stdio.h>
-#include <stdlib.h>
+
#include <string.h>
-#define ASSERT(expr) \
- do \
- { \
- if (!(expr)) \
- { \
- fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
- abort (); \
- } \
- } \
- while (0)
+#include "macros.h"
#define TESTFILE "t-fpurge.tmp"
int
-main ()
+main (void)
{
- FILE *fp;
-
- /* Create a file with some contents. */
- fp = fopen (TESTFILE, "w");
- if (fp == NULL)
- goto skip;
- if (fwrite ("foobarsh", 1, 8, fp) < 8)
- goto skip;
- if (fclose (fp))
- goto skip;
-
- /* Open it in read-write mode. */
- fp = fopen (TESTFILE, "r+");
- if (fp == NULL)
- goto skip;
- if (fseek (fp, 3, SEEK_CUR))
- goto skip;
- if (fwrite ("g", 1, 1, fp) < 1)
- goto skip;
- if (fflush (fp))
- goto skip;
- if (fwrite ("az", 1, 2, fp) < 2)
- goto skip;
- ASSERT (fpurge (fp) == 0);
- ASSERT (fclose (fp) == 0);
-
- /* Open it in read-only mode. */
- fp = fopen (TESTFILE, "r");
- if (fp == NULL)
- goto skip;
- {
- char buf[8];
- if (fread (buf, 1, 8, fp) < 8)
- goto skip;
- ASSERT (memcmp (buf, "foogarsh", 8) == 0);
- }
- ASSERT (fpurge (fp) == 0);
- ASSERT (fclose (fp) == 0);
+ int check_filepos;
+
+ for (check_filepos = 0; check_filepos <= 1; check_filepos++)
+ {
+ FILE *fp;
+
+ /* Create a file with some contents. */
+ fp = fopen (TESTFILE, "w");
+ if (fp == NULL)
+ goto skip;
+ if (fwrite ("foobarsh", 1, 8, fp) < 8)
+ goto skip;
+ if (fclose (fp))
+ goto skip;
+
+ /* The file's contents is now "foobarsh". */
+
+ /* Open it in read-write mode. */
+ fp = fopen (TESTFILE, "r+");
+ if (fp == NULL)
+ goto skip;
+ if (fseek (fp, 3, SEEK_CUR))
+ goto skip;
+ if (fwrite ("g", 1, 1, fp) < 1)
+ goto skip;
+ if (fflush (fp))
+ goto skip;
+ if (fwrite ("bz", 1, 2, fp) < 2)
+ goto skip;
+ /* Discard pending write. */
+ ASSERT (fpurge (fp) == 0);
+ /* Verify that when discarding pending output, the file position is set
+ back to where it was before the write calls. */
+ if (check_filepos)
+ ASSERT (ftell (fp) == 4);
+ ASSERT (fclose (fp) == 0);
+
+ /* Open it in read-only mode. */
+ fp = fopen (TESTFILE, "r");
+ if (fp == NULL)
+ goto skip;
+ /* Verify that the pending writes before the fpurge were really
+ discarded. */
+ {
+ char buf[8];
+ if (fread (buf, 1, 7, fp) < 7)
+ goto skip;
+ ASSERT (memcmp (buf, "foogars", 7) == 0);
+ }
+ /* Discard the buffered 'h'. */
+ if (check_filepos)
+ ASSERT (ftell (fp) == 7);
+ ASSERT (fpurge (fp) == 0);
+ /* Verify that when discarding pending input, the file position is
+ advanced to match the end of the previously read input. */
+ if (check_filepos)
+ ASSERT (ftell (fp) == 8);
+ ASSERT (getc (fp) == EOF);
+ ASSERT (fclose (fp) == 0);
+
+ /* The file's contents is now "foogarsh". */
+
+ /* Ensure that purging a read does not corrupt subsequent writes. */
+ fp = fopen (TESTFILE, "r+");
+ if (fp == NULL)
+ goto skip;
+ if (fseek (fp, -1, SEEK_END))
+ goto skip;
+ ASSERT (getc (fp) == 'h');
+ ASSERT (getc (fp) == EOF);
+ if (check_filepos)
+ ASSERT (ftell (fp) == 8);
+ ASSERT (fpurge (fp) == 0);
+ if (check_filepos)
+ ASSERT (ftell (fp) == 8);
+ ASSERT (putc ('!', fp) == '!');
+ if (check_filepos)
+ ASSERT (ftell (fp) == 9);
+ ASSERT (fclose (fp) == 0);
+ fp = fopen (TESTFILE, "r");
+ if (fp == NULL)
+ goto skip;
+ {
+ char buf[10];
+ ASSERT (fread (buf, 1, 10, fp) == 9);
+ ASSERT (memcmp (buf, "foogarsh!", 9) == 0);
+ }
+ ASSERT (fclose (fp) == 0);
+
+ /* The file's contents is now "foogarsh!". */
+ }
+ remove (TESTFILE);
return 0;
skip:
- fprintf (stderr, "Skipping test: file operations failed.\n");
+ fprintf (stderr, "Skipping test: prerequisite file operations failed.\n");
+ remove (TESTFILE);
return 77;
}