source: vital-to8-sdk/tools/bin2to8bin.c @ 1

// taken from somewhere
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>


unsigned char fill=0x00; 
 
static int
LoadBinFile(char *fname,char *binFname,int start,int exec)
{
   unsigned char mem[0x10000];
   int i;
   int size;
   FILE *f;

   // clears mem
   for (i=0;i<0x10000;i++) mem[i]=fill;
   
   f=fopen(fname,"rb");
   size=fread(mem,1,0x10000,f);
   fprintf(stderr,"Size : 0x%x start:0x%x exec:0x%x\n",size,start,exec);
   fclose(f);
   // we now have bin in mem from low to high... that is basiicaly what an stobin is supposed to do...
   f=fopen(binFname,"wb");
   

   fputc(0x00,f);
   // size 16bit big endian
   fputc((((size)&0xFF00)>>8),f);
   fputc(((size)&0xFF),f);
   // begin address
   fputc(((start&0xFF00)>>8),f);
   fputc((start&0xFF),f);
   // data
   for (i=0;i<size;i++)
       fputc(mem[i],f);
   fputc(0xFF,f);
   fputc(0x00,f);
   fputc(0x00,f);
   // run address (ie begin address here)
   fputc(((exec&0xFF00)>>8),f);
   fputc((exec&0xFF),f);           
   fclose(f);
   return 0;
}

int 
main(int argc, char *argv[]) {
        char *file_in=NULL;
        char *file_out=NULL;
        
        int start=-1;
        int exec=-1;
        
        int argnum;
        
        for (argnum=1;argnum<argc;argnum++) {
                if (strncmp(argv[argnum],"-o",2)==0) file_out=&argv[argnum][2];
                if (strncmp(argv[argnum],"-i",2)==0) file_in=&argv[argnum][2];
                if (strncmp(argv[argnum],"-start",6)==0) 
                        sscanf(&argv[argnum][6],"%x",&start);
                if (strncmp(argv[argnum],"-exec",5)==0) 
                        sscanf(&argv[argnum][5],"%x",&exec);
        }
        
        if (file_in==NULL) { fprintf(stderr,"No input file");exit(-1);};
        if (file_out==NULL) { fprintf(stderr,"No output file");exit(-1);};

        LoadBinFile(file_in,file_out,start,exec);
        return 0;
        
}