initial files checked in

libraries/Misc/circular_log.h

@@ -0,0 +1,96 @@
+#ifndef circ_log_h
+#define circ_log_h
+
+#include <TimeLib.h> //https://github.com/PaulStoffregen/Time
+#include <stdlib.h>
+
+template <int elementCnt> class circular_log
+{
+private:
+  char m_log[elementCnt];
+  
+  bool removeLastFromLog()
+  {
+    char* nextLine = strstr(m_log+1, "<BR>");
+    if(nextLine == NULL)
+    {
+      return false;
+    }
+
+    int newLineLen = strlen(nextLine);
+    memmove(m_log, nextLine, newLineLen);
+    m_log[newLineLen] = '\0';
+
+    return true;
+  }
+  
+public:
+  circular_log()
+  {
+    memset(m_log, 0, sizeof(m_log));
+  }
+  
+  const char* c_str() const { return m_log; }
+  int freeSpace() const { return elementCnt - strlen(m_log) - 1; }
+
+  void LogXml(const char* msg)
+  {
+    char szNew[256] = "";
+    snprintf(szNew, sizeof(szNew)-1, "<BR>%02d - %02d:%02d | ", day(), hour(), minute());
+
+    int ix = strlen(szNew);
+    while(*msg != '\0' && ix < 250)
+    {
+      if(*msg == '<')
+      {
+        szNew[ix++] = '&';
+        szNew[ix++] = 'l';
+        szNew[ix++] = 't';
+        szNew[ix++] = ';';
+      }
+      else if(*msg == '>')
+      {
+        szNew[ix++] = '&';
+        szNew[ix++] = 'g';
+        szNew[ix++] = 't';
+        szNew[ix++] = ';';
+      }
+      else
+      {
+        szNew[ix++] = *msg;
+      }
+      
+      msg++;
+    }
+    
+    const int newLen = strlen(szNew);
+    while(freeSpace() < newLen)
+    {
+      if(removeLastFromLog() == false)
+      {
+        return;
+      }
+    }
+
+    strcat(m_log, szNew);
+  }
+  
+  void Log(const char* msg)
+  {
+    char szNew[256] = "";
+    snprintf(szNew, sizeof(szNew)-1, "<BR>%02d - %02d:%02d | %s", day(), hour(), minute(), msg);
+
+    const int newLen = strlen(szNew);
+    while(freeSpace() < newLen)
+    {
+      if(removeLastFromLog() == false)
+      {
+        return;
+      }
+    }
+
+    strcat(m_log, szNew);
+  }
+};
+
+#endif //circular_log_h