Merge branch 'main' of https://next.forgejo.org/Turingon/QBoy

disassembler.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// How to compile? Like this!
+// gcc disassembler.c -o disassembler
+
+// Large chunks of the code are from my Intel 8080 emulator
+
+typedef struct buffer {
+    unsigned char* buffer;
+    int length;
+} buffer;
+
+buffer* read_file(char** argv) {
+    FILE* file = fopen(argv[1], "rb");
+    if (file == NULL) {
+        printf("Issue opening the file.\n");
+        return NULL;
+    }
+    fseek(file, 0L, SEEK_END);
+    int fsize = ftell(file);
+    fseek(file, 0L, SEEK_SET);
+
+    buffer *b = malloc(sizeof(buffer));
+    b->buffer = malloc(fsize);
+    b->length = fsize;
+
+    fread(b->buffer, fsize, 1, file);
+    fclose(file);
+
+    return b;
+}
+
+void print_buffer(buffer* b) {
+    for (int i = 0; i < 40; i++) {
+        printf("%02x \n", b->buffer[i]);
+    }
+}
+
+int disassemble8080(buffer* b, int pc) {
+    unsigned char *code = &(b->buffer[pc]);
+    int opbytes = 1;
+    printf("%04x ", pc);
+
+    // Will parse the opcodes.json for this
+    // To be done after the MMT blog post
+    printf("\n");
+    return opbytes;
+}
+
+
+
+int main (int argc, char** argv)  {
+    int pc = 0; //Program Counter
+
+    buffer* buff = read_file(argv);
+    if (buff == NULL) {
+        printf("Fatal error.\n");
+        return 1;
+    }
+    print_buffer(buff);
+    while (pc < 400) {//buff->length) {
+        pc += disassemble8080(buff, pc);
+    }
+    free(buff);
+    return 0;
+
+}