disasm.c

/* Quick and dity 6502 disassembler. */

#include <stdio.h>
#include <stdlib.h>
#include "M6502.h"

byte mem[0x10000];


int main (int argc, char **argv)
{
    FILE *in;
    long pc;
    long limit;
    size_t size;
    byte *base;


    if (argc!=3) {
        printf("Usage: dis6502 ORG INFILE\n(ORG is in hex)\n");
        return 0;
    }

    in=fopen(argv[2],"rb");
    if (!in) {
        fprintf(stderr,"Could not open \"%s\"\n",argv[2]);
        return 1;
    }

    pc=strtol(argv[1],NULL,16);
    fprintf(stderr,"Disassembly starting at $%04X\n",(unsigned int)pc);

    size=fread(mem,1,0x10000,in);
    limit=pc+size;
    base=mem-pc;
    fclose(in);

    fprintf(stderr,"Disassembling $%04X bytes (%i kilobytes)\n",size,size>>10);

    while (pc<limit) {
        char txt[256]="";
        pc+=DAsm(txt,base+pc,pc);
        printf("%04X %s\n",(unsigned)pc,txt);
    }

    return 0;
}