Allow use of different charmaps on Atari target

testcode/lib/atari/charmapping.c

@@ -0,0 +1,63 @@
+/*
+** testprogram for includes "atari_screen_charmap.h" and "atari_atascii_charmap.h"
+**
+** 19-Aug-2016, Christian Krueger
+*/
+
+#include <conio.h>
+#include <atari.h>
+#include <peekpoke.h>
+#include <string.h>
+
+
+char pcDefaultMappingString[] = "Hello Atari!";
+
+#include <atari_screen_charmap.h>
+char pcScreenMappingString[] = "Hello Atari!";
+
+#include <atari_atascii_charmap.h>
+char pcAtasciiMappingString[] = "Hello Atari!";
+
+/* THIS WON'T work due to string merging/collection problems!
+char* pcDefaultMappingString = "Hello Atari!";
+
+#include <atari_screen_charmap.h>
+char* pcScreenMappingString = "Hello Atari!";
+
+#include <atari_atascii_charmap.h>
+char* pcAtasciiMappingString = "Hello Atari!";
+*/
+
+int
+main(void)
+{
+    static unsigned char expectedAtasciiValues[] = { 40,101,108,108,111,0,33,116,97,114,105,1};
+
+    int returnValue = 0;
+    unsigned char* screen = (unsigned char*) PEEKW(88);
+
+    // check default (=atascii)
+    clrscr();
+    cputs(pcDefaultMappingString);
+    returnValue |= memcmp(screen, expectedAtasciiValues, sizeof(expectedAtasciiValues));
+
+    clrscr();
+    memcpy(screen, pcScreenMappingString, sizeof(expectedAtasciiValues));
+    returnValue |= memcmp(screen, expectedAtasciiValues, sizeof(expectedAtasciiValues));
+
+    clrscr();
+    cputs(pcAtasciiMappingString);
+    returnValue |= memcmp(screen, expectedAtasciiValues, sizeof(expectedAtasciiValues));
+
+    clrscr();
+    if (returnValue)
+        cputs("Test FAILED!");
+    else
+        cputs("Test passed.");
+
+    cputs("\n\rHit any key to exit...");
+    cgetc();
+
+    return returnValue;
+}
+