chore: Add course material

397/DOS_Unix/Screen_Unix.cpp

@@ -0,0 +1,66 @@
+#include "Screen.h"
+#include "CursesObj.h"
+#include "curses.h"
+#include <stdio.h>
+#include <string.h>
+
+//  Forward declarations
+int ConvertColour(int);
+
+void Screen::write(std::string s, int x, int y, int color) {
+    CursesObj::Instance(); // Force initialization
+
+    if (color >= 128)
+        color -= 128; // Remove gray background  - does not work on Linux
+
+    std::string blank_str(s.length(), ' ');
+
+    mvaddstr(y, x, blank_str.c_str()); // Always draw a black
+    refresh();
+
+    if (color != Screen::BLACK) //  If colour is not black, also draw the color
+    {
+        printf("\e[%i;3%im", 0, ConvertColour(color));
+
+        fflush(stdout);
+
+        mvaddstr(y, x, s.c_str());
+        refresh();
+    }
+}
+
+typedef struct {
+    int pelio_colour;
+    int curses_color_pair;
+} Entry;
+
+// Entry null pointer
+const Entry *ENTRY_NP = (Entry *)0;
+
+typedef Entry Table[];
+
+Table ColourTable = {{Screen::GRAY, 8}, //  Display as white
+                     {Screen::BLUE, 4}, {Screen::GREEN, 2}, {Screen::RED, 1}, {Screen::YELLOW, 3}, {Screen::WHITE, 7}};
+
+const int LEN_TAB = sizeof ColourTable / sizeof ColourTable[0];
+
+const Entry *TabSearch(Table t, int nEntries, int colour) {
+    Entry *p;
+
+    for (p = t; p < t + nEntries && p->pelio_colour != colour; p++)
+        ; //  EMPTY BODY
+
+    return (p < t + nEntries) ? p : ENTRY_NP;
+}
+
+int ConvertColour(int colour) {
+    int result = 0;
+    const Entry *p;
+
+    p = TabSearch(ColourTable, LEN_TAB, colour); //  Search the table for the colour specified
+
+    if (p != ENTRY_NP)                 //  If the colour is in the table ...
+        result = p->curses_color_pair; //  ... return the 'int' for the associated
+                                       //  curses colour pair
+    return result;
+}