Add isnanf module.

[pspp] / lib / fwriteerror.c

diff --git a/lib/fwriteerror.c b/lib/fwriteerror.c
index 6ffdf526d9b112dd67fe85e3f35609f893dc8add..3ea3eccd781c545144239050456f8afc9b0ac9f2 100644 (file)
--- a/lib/fwriteerror.c
+++ b/lib/fwriteerror.c
@@ -1,11 +1,11 @@
 /* Detect write error on a stream.
-   Copyright (C) 2003-2005 Free Software Foundation, Inc.
+   Copyright (C) 2003-2006 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2003.
 
-   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
@@ -13,12 +13,9 @@
    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/>.  */
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 /* Specification.  */
 #include "fwriteerror.h"
@@ -26,14 +23,20 @@
 #include <errno.h>
 #include <stdbool.h>
 
-int
-fwriteerror (FILE *fp)
+static int
+do_fwriteerror (FILE *fp, bool ignore_ebadf)
 {
   /* State to allow multiple calls to fwriteerror (stdout).  */
   static bool stdout_closed = false;
 
-  if (fp == stdout && stdout_closed)
-    return 0;
+  if (fp == stdout)
+    {
+      if (stdout_closed)
+       return 0;
+
+      /* If we are closing stdout, don't attempt to do it later again.  */
+      stdout_closed = true;
+    }
 
   /* Need to
      1. test the error indicator of the stream,
@@ -47,28 +50,58 @@ fwriteerror (FILE *fp)
   if (ferror (fp))
     {
       if (fflush (fp))
-       return -1; /* errno is set here */
+       goto close_preserving_errno; /* errno is set here */
       /* The stream had an error earlier, but its errno was lost.  If the
         error was not temporary, we can get the same errno by writing and
         flushing one more byte.  We can do so because at this point the
         stream's contents is garbage anyway.  */
       if (fputc ('\0', fp) == EOF)
-       return -1; /* errno is set here */
+       goto close_preserving_errno; /* errno is set here */
       if (fflush (fp))
-       return -1; /* errno is set here */
+       goto close_preserving_errno; /* errno is set here */
       /* Give up on errno.  */
       errno = 0;
-      return -1;
+      goto close_preserving_errno;
     }
 
-  /* If we are closing stdout, don't attempt to do it later again.  */
-  if (fp == stdout)
-    stdout_closed = true;
-
-  if (fclose (fp))
-    return -1; /* errno is set here */
+  if (ignore_ebadf)
+    {
+      /* We need an explicit fflush to tell whether some output was already
+        done on FP.  */
+      if (fflush (fp))
+       goto close_preserving_errno; /* errno is set here */
+      if (fclose (fp) && errno != EBADF)
+       return -1; /* errno is set here */
+    }
+  else
+    {
+      if (fclose (fp))
+       return -1; /* errno is set here */
+    }
 
   return 0;
+
+ close_preserving_errno:
+  /* There's an error.  Nevertheless call fclose(fp), for consistency
+     with the other cases.  */
+  {
+    int saved_errno = errno;
+    fclose (fp);
+    errno = saved_errno;
+    return -1;
+  }
+}
+
+int
+fwriteerror (FILE *fp)
+{
+  return do_fwriteerror (fp, false);
+}
+
+int
+fwriteerror_no_ebadf (FILE *fp)
+{
+  return do_fwriteerror (fp, true);
 }