Diff: DebugTrace.cpp

Revision:

0:21c0c97a5d7c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebugTrace.cpp	Thu Feb 03 12:10:20 2011 +0000
@@ -0,0 +1,143 @@
+/*
+* DebugTrace. Allows dumping debug messages/values to serial or
+* to file.
+*
+* Copyright (C) <2009> Petras Saduikis <petras@petras.co.uk>
+*
+* This file is part of DebugTrace.
+*
+* DebugTrace 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 3 of the License, or
+* (at your option) any later version.
+* 
+* DebugTrace is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with DebugTrace.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "DebugTrace.h"
+#include <mbed.h>
+#include <stdarg.h>
+#include <string.h>
+
+Serial logSerial(USBTX, USBRX);
+LocalFileSystem local("local");
+
+const char* FILE_PATH = "/local/";
+const char* EXTN = ".bak";
+
+DebugTrace::DebugTrace(eLog on, eLogTarget mode, const char* fileName, int maxSize) :
+    enabled(on), logMode(mode), maxFileSize(maxSize), currentFileSize(0),
+    logFileStatus(0)
+{
+    // allocate memory for file name strings
+    int str_size = (strlen(fileName) + strlen(FILE_PATH) + strlen(EXTN) + 1) * sizeof(char); 
+    logFile = (char*)malloc(str_size);
+    logFileBackup = (char*)malloc(str_size);
+    
+    // add path to log file name
+    strcpy(logFile, FILE_PATH);
+    strcat(logFile, fileName);
+    
+    // create backup file name
+    strcpy(logFileBackup, logFile);
+    strcpy(logFileBackup, strtok(logFileBackup, "."));
+    strcat(logFileBackup, EXTN);
+}
+
+DebugTrace::~DebugTrace()
+{
+    // dust to dust, ashes to ashes
+    if (logFile != NULL) free(logFile);
+    if (logFileBackup != NULL) free(logFileBackup);
+}
+
+void DebugTrace::clear()
+{
+    // don't care about whether these fail
+    remove(logFile);    
+    remove(logFileBackup);
+}
+
+void DebugTrace::backupLog()
+{
+    // delete previous backup file
+    if (remove(logFileBackup))
+    {
+        // standard copy stuff
+        char ch;
+        FILE* to = fopen(logFileBackup, "wb");
+        if (NULL != to)
+        {
+            FILE* from = fopen(logFile, "rb");   
+            if (NULL != from)
+            {
+                while(!feof(from))
+                {
+                    ch = fgetc(from);
+                    if (ferror(from)) break;
+                    
+                    if(!feof(from)) fputc(ch, to);
+                    if (ferror(to)) break;
+                }
+            }
+            
+            if (NULL != from) fclose(from);
+            if (NULL != to) fclose(to);
+        }
+    }
+
+    // now delete the log file, so we are ready to start again
+    // even if backup creation failed - the show must go on!
+    logFileStatus = remove(logFile);
+}
+
+void DebugTrace::traceOut(const char* fmt, ...)
+{
+    if (enabled)
+    {
+        va_list ap;            // argument list pointer
+        va_start(ap, fmt);
+        
+        if (TO_SERIAL == logMode)
+        {
+            vfprintf(logSerial, fmt, ap);
+        }
+        else    // TO_FILE
+        {
+            if (0 == logFileStatus)    // otherwise we failed to remove a full log file
+            {
+                // Write data to file. Note the file size may go over limit
+                // as we check total size afterwards, using the size written to file.
+                // This is not a big issue, as this mechanism is only here
+                // to stop the file growing unchecked. Just remember log file sizes may
+                // be some what over (as apposed to some what under), so don't push it 
+                // with the max file size.
+                FILE* fp = fopen(logFile, "a");
+                if (NULL == fp)
+                {
+                    va_end(ap);
+                    return;
+                }
+                int size_written = vfprintf(fp, fmt, ap);
+                fclose(fp);
+                
+                // check if we are over the max file size
+                // if so backup file and start again
+                currentFileSize += size_written;
+                if (currentFileSize >= maxFileSize)
+                {
+                    backupLog();
+                    currentFileSize = 0;
+                }
+            }
+        }
+        
+        va_end(ap);
+    }
+}