From df566a054e6ee4b567bb1635073448ffc599a982 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Thu, 27 Apr 2023 21:12:58 +1000
Subject: interpreter.c is mostly complete

---
 headers/apple.h |  4 ++-
 interpreter.c   | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++-------
 makefile        |  2 +-
 3 files changed, 86 insertions(+), 13 deletions(-)

diff --git a/headers/apple.h b/headers/apple.h
index cfcc879..b17124b 100644
--- a/headers/apple.h
+++ b/headers/apple.h
@@ -5,7 +5,9 @@ void AppleOn(){
 	initInstructionTable();
 }
 
-void AppleReset(){	//Firt few Zp addresses have gibberish, need to fix
+void AppleReset(){
+	acc = 0; X = 0; Y = 0; P = 0; S = 0;
+	idata.cycles = 0; idata.length = 0; idata.add = 0; idata.value = 0;
 	free(Memory);
 	Memory = calloc(MEMORY_SIZE, sizeof(byte));
 }
\ No newline at end of file
diff --git a/interpreter.c b/interpreter.c
index fece473..331da43 100644
--- a/interpreter.c
+++ b/interpreter.c
@@ -1,9 +1,41 @@
-//  test.c
-//  Temporary .c file where arbitrary tests are carried out.
+//  interpreter.c
+//  Useful for carrying out tests of the CPU instructions.
 
-#include"headers/include.h" //LOOK INTO PTHREADS
+/*  interpreter.c manual
+
+This program contains many functions which make it easy to write tests for the 6502 CPU.
+
+The expected input is machine code written in plaintext.
+
+The program accepts stdin, so it can be used in two ways.
+    - Typing instructions inline.
+    - Piping a file in with cat.
+I didn't implement arguments because this is only a debug program.
+
+Here are some valid ways to write an LDA with immediate addressing:
+    a901
+    A901
+    A9 01
+
+The interpreter comes with multiple statements for the purpose of debugging the emulator.
+    Qq  Quits the program.
+        Should be put at the end of a textfile, or the program will segfault (inconsequentially).
+    Rr  Resets the virtual computer.
+    Pp  Dumps processor state.
+    Mm  Dumps a specified page of memory.
+        Takes an argument only of the form XX.
+        Be aware that unallocated memory is permitted to be dumped.
+    /   Prints until newline.
+    #   Ignores until newline.
+*/
+
+
+#include"headers/include.h"
 #include"headers/debug.h"
 
+//Write a custom getc function here which ignores spaces
+
+
 int main(int argc, char *argv[]){
     AppleOn();
     
@@ -12,34 +44,73 @@ int main(int argc, char *argv[]){
 
     // Interpreter loop
     while(1){
+
+        //  Retrieve first character of a line
         do {
             c = getc(stdin);
-        } while (c == '\n' || c == ' ');
+        } while (c == '\n' || c == ' ' || c == '\t');
+
+        //  The following are special debug commands.
 
+        //  Quit program
+        if (c == 'Q' || c == 'q'){
+            break;
+        }
+
+        if (c == 'R' || c == 'r'){
+            AppleReset(); //need to flesh out this function
+            continue;
+        }
+
+        //  Dump processor status
         if (c == 'P' || c == 'p'){
             dStatusDump();
             continue;
         }
 
-        if (c == 'M' || c == 'm'){
-            c = dCharToNum(getc(stdin)) << 4;
+        //  Dump a page of memory
+        if (c == 'M' || c == 'm'){  
+            do {
+                c = getc(stdin);
+            } while(c == ' ' || c == '\n');
+            c = dCharToNum(c) << 4;
             c += dCharToNum(getc(stdin));
             dPageDump(c);
             continue;
         }
 
+        //  Print out a statement
+        if (c == '/'){  
+            do {
+                c = getc(stdin);
+                printf("%c", c);
+            } while(c != '\n');
+            continue;
+        }
+
+        //  Comment, so ignores until newline.
+        if (c == '#'){
+            do {
+                c = getc(stdin);
+            } while(c != '\n');
+            continue;
+        }
+
         //  From here on it is expected input will be mostly correct
         c = dCharToNum(c) << 4;
         c += dCharToNum(getc(stdin));
         address x = 0x0000;
         char z;
         for(int i = ((fAddressGetLengthPrempt(c) * 2) - 2); i > 0; i--) {
-            z = getc(stdin);
-            if (z != '\n'){
-                x += dCharToNum(z) << ((4 * (i - 1)));
-            }else{
+            do {
+                z = getc(stdin);
+            } while (z == ' ' || z == '\t');
+
+            //if (z != '\n'){
+            x += dCharToNum(z) << ((4 * (i - 1)));
+            /*}else{
                 i++;
-            }
+            }*/
         }
         callInstructionTable(c, x);
     }
diff --git a/makefile b/makefile
index 7fe60de..44bb2c1 100644
--- a/makefile
+++ b/makefile
@@ -1,2 +1,2 @@
 main:
-	gcc interpreter.c -o a
+	gcc interpreter.c -o interpreter
\ No newline at end of file
-- 
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