TextDisplay.cpp

00001 /* mbed TextDisplay Display Library Base Class
00002  * Copyright (c) 2007-2009 sford
00003  * Released under the MIT License: http://mbed.org/license/mit
00004  */
00005 
00006 #include "TextDisplay.h"
00007 
00008 #define DEBUG "Text"
00009 // ...
00010 // INFO("Stuff to show %d", var); // new-line is automatically appended
00011 //
00012 #if (defined(DEBUG) && !defined(TARGET_LPC11U24))
00013 #define INFO(x, ...) std::printf("[INF %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00014 #define WARN(x, ...) std::printf("[WRN %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00015 #define ERR(x, ...)  std::printf("[ERR %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00016 #else
00017 #define INFO(x, ...)
00018 #define WARN(x, ...)
00019 #define ERR(x, ...)
00020 #endif
00021 
00022 TextDisplay::TextDisplay(const char *name) : Stream(name)
00023 {
00024     _row = 0;
00025     _column = 0;
00026     if (name == NULL) {
00027         _path = NULL;
00028     } else {
00029         _path = new char[strlen(name) + 2];
00030         sprintf(_path, "/%s", name);
00031     }
00032 }
00033 
00034 int TextDisplay::_putc(int value)
00035 {
00036     INFO("_putc(%d)", value);
00037     if(value == '\n') {
00038         _column = 0;
00039         _row++;
00040         if(_row >= rows() ) {             // #### hb. Fix missing 18th row issue.
00041             _row = 0;
00042         }
00043     } else {
00044         character(_column, _row, value);
00045         _column++;
00046         if(_column >= columns()) {
00047             _column = 0;
00048             _row++;
00049             if(_row >= rows() ) {        // #### hb. Fix missing 18th row issue.
00050                 _row = 0;
00051             }
00052         }
00053     }
00054     return value;
00055 }
00056 
00057 // crude cls implementation, should generally be overwritten in derived class
00058 RetCode_t TextDisplay::cls()
00059 {
00060     INFO("cls()");
00061     locate(0, 0);
00062     for(int i=0; i<columns()*rows(); i++) {
00063         putc(' ');
00064     }
00065     return noerror;
00066 }
00067 
00068 RetCode_t TextDisplay::locate(textloc_t column, textloc_t row)
00069 {
00070     INFO("locate(%d,%d)", column, row);
00071     _column = column;
00072     _row = row;
00073     return noerror;
00074 }
00075 
00076 int TextDisplay::_getc()
00077 {
00078     return -1;
00079 }
00080 
00081 RetCode_t TextDisplay::foreground(uint16_t color)
00082 {
00083     //INFO("foreground(%4X)", color);
00084     _foreground = color;
00085     return noerror;
00086 }
00087 
00088 RetCode_t TextDisplay::background(uint16_t color)
00089 {
00090     //INFO("background(%4X)", color);
00091     _background = color;
00092     return noerror;
00093 }
00094 
00095 bool TextDisplay::claim(FILE *stream)
00096 {
00097     if ( _path == NULL) {
00098         fprintf(stderr, "claim requires a name to be given in the instantiator of the TextDisplay instance!\r\n");
00099         return false;
00100     }
00101     if (freopen(_path, "w", stream) == NULL) {
00102         return false;       // Failed, should not happen
00103     }
00104     // make sure we use line buffering
00105     setvbuf(stdout, NULL, _IOLBF, columns());
00106     return true;
00107 }
00108