Added debug.c

1 files changed, 45 insertions, 0 deletions

diff --git a/debug.c b/debug.c
new file mode 100644
index 0000000..ec6a75a
--- /dev/null
+++ b/debug.c
@@ -0,0 +1,45 @@
+/*	
+ *	debug.c is a tool which can be used to interpret 6502 machine code inline.
+ *	Machine code is expected as hexadecimal of length 2 or 6, depending on the instruction.
+ *	Note that zero-page addressing is not fully emulated yet; it will still address the zero-page
+ 	section of memory but the instructions still take an address of length 4.
+	This will be fixed later when the whole system is functional.
+ *	
+ */
+
+#include"include.h"
+
+int charToNum (char c, int mul) {
+	if (c != 0x20 && (c >= 0x30 && c <= 0x39)){
+		a = (mul * (c - 0x30));
+	}else if (c != 0x20 && (c >= 0x41 && c <= 0x46)){
+		a = (mul * (c - 0x31));
+	}
+}
+
+int main(){
+	char c;
+	unsigned char a, b;
+	while(true){
+		// Pass 1
+		c = getchar(); if (c == EOF) break;
+		a += charToNum(c, 0x10);
+		// Pass 2
+		c = getchar(); if (c == EOF) break;
+		a += charToNum(c, 0x01);
+		//Check for next value
+		c = getchar();
+		if (!(c == EOF || c == ' ')) {
+			// Four passes
+			b += charToNum(c, 0x1000);
+			c = getchar(); if (c == EOF) break;
+			b += charToNum(c, 0x0100);
+			c = getchar(); if (c == EOF) break;
+			b += charToNum(c, 0x0010);
+			c = getchar(); if (c == EOF) break;
+			b += charToNum(c, 0x0001);
+		}
+		runInstruction(a, b);
+		c = getchar(); if (c == EOF) break;
+	}
+}
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