C

int add_input_file(char *path)
{
 int  i;
 FILE  *f;

 if (in_files_count >= MAX_IN_FILES) return(-1);
 i = access(path, R_OK | F_OK);
 if (i != 0) {
  printf("Can not access file: %s\n", path);
  return(HPI_SHELL_PARM_ERROR);
 };
 f = fopen(path, "r");
 if (f == (FILE *)NULL) {
  printf("Can not open file: %s\n", path);
  return(HPI_SHELL_PARM_ERROR);
 };
 input_files[in_files_count] = f;
 in_files_count++;
 input_file = f;
 return(0);
}