Diff: libs/StreamOutput.h

Revision:

2:1df0b61d3b5a

Parent:

0:31e91bb0ef3c

Child:

3:f151d08d335c

--- a/libs/StreamOutput.h	Sat Mar 01 02:37:29 2014 +0000
+++ b/libs/StreamOutput.h	Fri Feb 28 18:52:52 2014 -0800
@@ -1,22 +1,64 @@
+/*
+      This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl).
+      Smoothie 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.
+      Smoothie 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 Smoothie. If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef STREAMOUTPUT_H
 #define STREAMOUTPUT_H
 
+#include <cstdarg>
+#include <cstring>
+#include <stdio.h>
+
+// This is a base class for all StreamOutput objects.
+// StreamOutputs are basically "things you can sent strings to". They are passed along with gcodes for example so modules can answer to those gcodes.
+// They are usually associated with a command source, but can also be a NullStreamOutput if we just want to ignore whatever is sent
+
+class NullStreamOutput;
+
 class StreamOutput {
     public:
-       StreamOutput(){}
-       virtual int printf(const char* format, ...){return 0;}
+        StreamOutput(){}
+        virtual ~StreamOutput(){}
+
+        virtual int printf(const char* format, ...) __attribute__ ((format(printf, 2, 3))) {
+            char b[64];
+            char *buffer;
+            // Make the message
+            va_list args;
+            va_start(args, format);
+
+            int size = vsnprintf(b, 64, format, args)
+                + 1; // we add one to take into account space for the terminating \0
 
+            if (size < 64)
+                buffer = b;
+            else
+            {
+                buffer = new char[size];
+                vsnprintf(buffer, size, format, args);
+            }
+            va_end(args);
 
+            puts(buffer);
 
+            if (buffer != b)
+                delete[] buffer;
 
+            return size - 1;
+        }
+        virtual int _putc(int c) { return 1; }
+        virtual int _getc(void) { return 0; }
+        virtual int puts(const char* str) = 0;
+
+        static NullStreamOutput NullStream;
 };
 
-
-
-
-
-
-
-
+class NullStreamOutput : public StreamOutput {
+    public:
+        int puts(const char* str) { return strlen(str); }
+};
 
 #endif