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/*

 * bin2exo.c -- convert binary data to Motorola S-records

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

void error(char *fmt, ...) {

  va_list ap;

  va_start(ap, fmt);

  printf("Error: ");

  vprintf(fmt, ap);

  printf("\n");

  va_end(ap);

  exit(1);

}

int main(int argc, char *argv[]) {

  char *endptr;

  unsigned int loadAddr;

  FILE *infile;

  FILE *outfile;

  int numBytes, i;

  int c;

  unsigned char lineData[16];

  unsigned int chksum;

  if (argc != 4) {

    printf("Usage: %s <load addr, hex> <input file> <output file>\n",

           argv[0]);

    exit(1);

  }

  loadAddr = strtoul(argv[1], &endptr, 16);

  if (*endptr != '\0') {

    error("illegal load address %s", argv[1]);

  }

  infile = fopen(argv[2], "rb");

  if (infile == NULL) {

    error("cannot open input file %s", argv[2]);

  }

  outfile = fopen(argv[3], "wt");

  if (outfile == NULL) {

    error("cannot open output file %s", argv[3]);

  }

  while (1) {

    chksum = 0;

    for (numBytes = 0; numBytes < 16; numBytes++) {

      c = fgetc(infile);

      if (c == EOF) {

        break;

      }

      lineData[numBytes] = c;

      chksum += c;

    }

    if (numBytes == 0) {

      break;

    }

    fprintf(outfile, "S2%02X%06X", numBytes + 4, loadAddr);

    for (i = 0; i < numBytes; i++) {

      fprintf(outfile, "%02X", lineData[i]);

    }

    chksum += numBytes + 4;

    chksum += ((loadAddr >>  0) & 0xFF) +

              ((loadAddr >>  8) & 0xFF) +

              ((loadAddr >> 16) & 0xFF);

    fprintf(outfile, "%02X\n", 0xFF - (chksum & 0xFF));

    loadAddr += numBytes;

    if (c == EOF) {

      break;

    }

  }

  fprintf(outfile, "S804000000FB\n");

  fclose(infile);

  fclose(outfile);

  return 0;

}