line_info.c

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/******************************************************************/
/******************************************************************/
int line_info(
  char file_format,
  int *linepos,
  char c,
  //HEXDUMP:
  struct tag_hexdumpline *hexdumpline,
  //MOT, MOTBIN:
  struct tag_motline *motline,
  int hexmode
  )
{
  int r = 0;
 
  /*
   * NOTE
   * *linepos == -1:  This function has no effect, return value is zero.
   * *linepos == 0:   Is not used.
   * *linepos == 1:   Points to first byte of line.
   */
 
  if(*linepos > -1) {     //is line scanner active?
    if(*linepos == 0) {   //initialize
      //clear structs for line_info()
      if(motline != NULL) {
        motline->linelen = 0;
        motline->addrlen = 0;
        motline->pos_addrlsb = 0;
        motline->payload_orig = 0;
        motline->payload = 0;
        motline->length = 0;
        motline->checksum = 0;
        motline->chksum_rx = 0;
      }
      if(hexdumpline != NULL) {
        hexdumpline->is_charset_print = OFF;
        hexdumpline->is_comment_line = OFF;
        hexdumpline->is_first = '-';
      }
    }
    *linepos += 1;  //let's start with value 1, which is easier to understand
    switch(file_format) {
      case MOTBIN:
        switch(*linepos) {
          case 0:   //not used
            break;
 
          case 1:   //'S' character
            break;
 
          case 2:
            motline->addrlen = MOT_addrlen(c);
            motline->pos_addrlsb = 4 + motline->addrlen * 2;
            break;
 
          case 3:
            motline->linelen = hexdigit2bin(c) << 4;
            break;
 
          case 4:
            motline->linelen |= hexdigit2bin(c);
            motline->checksum = motline->linelen;   //start summing checksum
            //payload_orig: don't count address bytes and checksum
            motline->payload_orig = (motline->linelen - motline->addrlen - 1) << (hexmode ? 1 : 0);
            motline->length = motline->linelen + motline->addrlen + 8;
            break;
 
          default:
            if(*linepos <= motline->pos_addrlsb)
              motline->checksum += (*linepos % 2) ? hexdigit2bin(c) << 4 : hexdigit2bin(c);
            if(*linepos == motline->pos_addrlsb)
              motline->payload = motline->payload_orig;
            else if(motline->payload) {
              motline->checksum += c;
              motline->payload--;
              r = 1;
            }
            if(*linepos == motline->pos_addrlsb + motline->payload_orig + 1)
              motline->chksum_rx = hexdigit2bin(c) << 4;
            if(*linepos == motline->pos_addrlsb + motline->payload_orig + 2) {
              motline->chksum_rx |= hexdigit2bin(c);
              motline->checksum = ~motline->checksum;
            }
            break;
        }
        break;
 
      case HEXDUMP:
        if(*linepos == 1)
          hexdumpline->is_first = c;
        if(c == '#') {
          hexdumpline->is_charset_print = ON;
          if(*linepos == 1)
            hexdumpline->is_comment_line = ON;
        }
        break;
    }
  }
  return r;
}