// AUTHOR: Rodrigo Frehse Pereira 
// COMPILATION: gcc dot2comma.c -Wall -lm -o dot2comma.x
// USAGE: ./dot2comma.x name_of_file.ps(.eps)

FILE *input;
FILE *output;

int main(int argc, char *argv[])
{
  char get;
  char input_file[200], output_file[200];
  int inside,count_replace;
  void credits(),final_verbose();
  int  validation();

  // Credits on screen and sintax validation.
  credits();
  validation(argc,argv);
  
  // Create filename strings: "input_file" and "output_file" 
  sprintf(input_file, "%s", argv[1]);
  sprintf(output_file, "%s.old", argv[1]);
  
  if( ((input = fopen(input_file, "r"))==NULL) || 
      ((output = fopen(output_file, "w"))==NULL) )
    printf("Unable to read from '%s' or write over '%s' - Aborting...\n", 
      input_file, output_file);
  else
    { // Main code...

      // Backuping to .old file. Copy input file to output file. 
      while(fscanf(input, "%c", &get)!=EOF)
	fprintf(output, "%c", get);
      fclose(input);
      fclose(output);
      
      // Reverse input/output file descriptors. So on, read from backup
 (.old) and       write over original input file
      input = fopen(output_file, "r");
      output = fopen(input_file, "w");
      rewind(input);

      // While block statement: loops over backup (.old) file
 contents, reading it       byte-by-byte
      inside = 0; count_replace=0;
      while(fscanf(input, "%c", &get)!=EOF)
	{
	  // Check if inside parenthesis environment "( )"
	  if( (get=='(') && (inside==0) )
	    inside = 1;
	  else if(get==')')
	    inside = 0;
	  // If dot is found inside parenthesis environment "( )" 
replace it to comma. 
	  // Write over original input file (it's not .old backup file!)
	  if( (inside) && (get=='.') ){
	    fprintf(output, ",");
	    ++count_replace;//  replacement counter
	    }
	  else
	    fprintf(output, "%c", get);
	}
      
      fclose(input);
      fclose(output);
    }

  final_verbose(input_file,output_file, count_replace);  

  return 0;
}

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