strtoumax: fix typo in previous commit.

[gnulib.git] / tests / test-fwriting.c

diff --git a/tests/test-fwriting.c b/tests/test-fwriting.c
index 00b6870..6e8b094 100644 (file)
--- a/tests/test-fwriting.c
+++ b/tests/test-fwriting.c
@@ -1,10 +1,10 @@
 /* Test of fwriting() function.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2013 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
@@ -12,18 +12,20 @@
    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>
 
+/* 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 "fwriting.h"
 
-#include <stdlib.h>
+#include <stdio.h>
 
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "macros.h"
 
 #define TESTFILE "t-fwriting.tmp"
 
@@ -73,6 +75,7 @@ main ()
      fwriting is only deterministic after input or output, but this
      test case should be portable even on open, after reposition, and
      after fflush.  */
+  /* First a scenario with only fgetc, fseek, fputc.  */
   fp = fopen (TESTFILE, "r+");
   if (fp == NULL)
     goto skip;
@@ -91,12 +94,14 @@ main ()
   if (fseek (fp, 0, SEEK_CUR) != 0)
     goto skip;
   ASSERT (!fwriting (fp));
-  if (fputc ('z', fp) != 'z')
+  if (fputc ('x', fp) != 'x')
     goto skip;
   ASSERT (fwriting (fp));
   if (fseek (fp, 0, SEEK_END))
     goto skip;
-  /* fwriting (fp) is undefined here, but freading (fp) is false.  */
+  /* 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;
 
@@ -105,6 +110,7 @@ main ()
      fwriting is only deterministic after input or output, but this
      test case should be portable even on open, after reposition, and
      after fflush.  */
+  /* Here a scenario that includes fflush.  */
   fp = fopen (TESTFILE, "r+");
   if (fp == NULL)
     goto skip;
@@ -120,7 +126,7 @@ main ()
   ASSERT (!fwriting (fp));
   fflush (fp);
   ASSERT (!fwriting (fp));
-  if (fgetc (fp) != 'a')
+  if (fgetc (fp) != 'x')
     goto skip;
   ASSERT (!fwriting (fp));
   /* This fseek call is necessary when switching from reading to writing.
@@ -133,7 +139,9 @@ main ()
   ASSERT (fwriting (fp));
   if (fseek (fp, 0, SEEK_END))
     goto skip;
-  /* fwriting (fp) is undefined here, but freading (fp) is false.  */
+  /* 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;