Better error handling when writing configuration files

HISTORY

@@ -750,3 +750,4 @@ Video Disk Recorder Revision History
 - Changed obsolete macro VIDEO_WINDOW_CHROMAKEY to VID_TYPE_CHROMAKEY (thanks
   to Guido Fiala).
 - New version of the "Master-Timer" tool (thanks to Matthias Schniedermeyer).
+- Better error handling when writing configuration files.

config.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: config.c 1.70 2001/09/14 14:35:30 kls Exp $
+ * $Id: config.c 1.71 2001/09/16 08:57:58 kls Exp $
  */
 
 #include "config.h"
@@ -122,24 +122,14 @@ bool cKeys::Load(const char *FileName)
 
 bool cKeys::Save(void)
 {
-  bool result = true;
   cSafeFile f(fileName);
   if (f.Open()) {
-     if (fprintf(f, "Code\t%c\nAddress\t%04X\n", code, address) > 0) {
+     fprintf(f, "Code\t%c\nAddress\t%04X\n", code, address);
-        for (tKey *k = keys; k->type != kNone; k++) {
+     for (tKey *k = keys; k->type != kNone; k++)
-            if (fprintf(f, "%s\t%08X\n", k->name, k->code) <= 0) {
+         fprintf(f, "%s\t%08X\n", k->name, k->code);
-               result = false;
+     return f.Close();
-               break;
      }
-            }
+  return false;
-         }
-     else
-        result = false;
-     f.Close();
-     }
-  else
-     result = false;
-  return result;
 }
 
 eKeys cKeys::Get(unsigned int Code)
@@ -928,12 +918,11 @@ bool cSetup::Save(const char *FileName)
         fprintf(f, "MultiSpeedMode     = %d\n", MultiSpeedMode);
         fprintf(f, "ShowReplayMode     = %d\n", ShowReplayMode);
         fprintf(f, "CurrentChannel     = %d\n", CurrentChannel);
-        f.Close();
+        if (f.Close()) {
            isyslog(LOG_INFO, "saved setup to %s", FileName);
            return true;
            }
-     else
+        }
-        LOG_ERROR_STR(FileName);
      }
   else
      esyslog(LOG_ERR, "attempt to save setup without file name");

config.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: config.h 1.77 2001/09/14 14:35:32 kls Exp $
+ * $Id: config.h 1.78 2001/09/15 15:38:40 kls Exp $
  */
 
 #ifndef __CONFIG_H
@@ -226,7 +226,8 @@ public:
                 }
              l = (T *)l->Next();
              }
-       f.Close();
+       if (!f.Close())
+          result = false;
        }
     else
        result = false;

tools.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.c 1.44 2001/09/14 14:35:37 kls Exp $
+ * $Id: tools.c 1.45 2001/09/15 15:41:16 kls Exp $
  */
 
 #define _GNU_SOURCE
@@ -554,13 +554,27 @@ bool cSafeFile::Open(void)
   return f != NULL;
 }
 
-void cSafeFile::Close(void)
+bool cSafeFile::Close(void)
 {
+  bool result = true;
   if (f) {
-     fclose(f);
+     if (ferror(f) != 0) {
-     f = NULL;
+        LOG_ERROR_STR(tempName);
-     rename(tempName, fileName);
+        result = false;
         }
+     if (fclose(f) < 0) {
+        LOG_ERROR_STR(tempName);
+        result = false;
+        }
+     f = NULL;
+     if (result && rename(tempName, fileName) < 0) {
+        LOG_ERROR_STR(fileName);
+        result = false;
+        }
+     }
+  else
+     result = false;
+  return result;
 }
 
 // --- cListObject -----------------------------------------------------------

tools.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.h 1.33 2001/09/14 14:35:40 kls Exp $
+ * $Id: tools.h 1.34 2001/09/15 15:22:57 kls Exp $
  */
 
 #ifndef __TOOLS_H
@@ -93,7 +93,7 @@ public:
   ~cSafeFile();
   operator FILE* () { return f; }
   bool Open(void);
-  void Close(void);
+  bool Close(void);
   };
 
 class cListObject {