Don't add new message to logf when we dump it to file

Fix log file corruption if we have new messages at dumping log to file. Comment
removed as it incorrect. We store all messages in direct order (last message at
end of file).

Change-Id: I4acfa8a0935cc41a889e08f6bc42974fefd1ade2

apps/logfdisp.c

@@ -218,42 +218,44 @@ bool logfdisplay(void)
 }
 #endif /* HAVE_LCD_BITMAP */
 
-/* Store the logf log to logf.txt in the .rockbox directory. The order of the
- * entries will be "reversed" so that the most recently logged entry is on the
- * top of the file */
 bool logfdump(void)
 {
     int fd;
 
     splashf(HZ, "Log File Dumped");
-    
+
     /* nothing to print ? */
     if(logfindex == 0 && !logfwrap)
         /* nothing is logged just yet */
         return false;
-    
+
+    logfenabled = false;
+
     fd = open(ROCKBOX_DIR "/logf.txt", O_CREAT|O_WRONLY|O_TRUNC, 0666);
     if(-1 != fd) {
         int i;
-        
+
         if(logfwrap)
             i = logfindex;
         else
             i = 0;
-        
+
         do {
             if(logfbuffer[i]=='\0')
                 fdprintf(fd, "\n");
             else
                 fdprintf(fd, "%c", logfbuffer[i]);
-                
+
             i++;
             if(i >= MAX_LOGF_SIZE)
                 i = 0;
         } while(i != logfindex);
-        
+
         close(fd);
     }
+
+    logfenabled = true;
+
     return false;
 }
 

firmware/export/logf.h

@@ -34,6 +34,7 @@
 extern unsigned char logfbuffer[MAX_LOGF_SIZE];
 extern int logfindex;
 extern bool logfwrap;
+extern bool logfenabled;
 #endif /* __PCTOOL__ */
 
 #define logf _logf

firmware/logf.c

@@ -62,6 +62,7 @@ static int logdiskfindex;
 unsigned char logfbuffer[MAX_LOGF_SIZE];
 int logfindex;
 bool logfwrap;
+bool logfenabled = true;
 #endif
 
 #ifdef HAVE_REMOTE_LCD
@@ -214,6 +215,9 @@ static int logf_push(void *userp, unsigned char c)
 
 void _logf(const char *fmt, ...)
 {
+    if (!logfenabled)
+        return;
+
     #ifdef USB_ENABLE_SERIAL
     int old_logfindex = logfindex;
     #endif