Page History

enum { NO_FILE_POS_VALUES = 3 };

errno_tint opener(
  FILE* file, 
  unsigned int *width, 
  unsigned int *height, 
  unsigned int *data_offset
) {
  unsigned int file_w;
  unsigned int file_h;
  unsigned int file_o;
  int rc;
  fpos_t offset;

  memset(&offset, 0, sizeof(offset));

  if (file == NULL) { return EINVAL; }

  if (fscanf(file, "%u %u %u", &file_w, &file_h, &file_o)  
      != NO_FILE_POS_VALUES) { return EIO; }

  rc = fsetpos(file, &offset);
  if (rc != 0 ) { return rc; }

  *width = file_w;
  *height = file_h;
  *data_offset = file_o;

  return 0;
}

enum { NO_FILE_POS_VALUES = 3 };

errno_tint opener(
  FILE* file, 
  unsigned int *width, 
  unsigned int *height, 
  unsigned int *data_offset
) {
  unsigned int file_w;
  unsigned int file_h;
  unsigned int file_o;
  int rc;
  fpos_t offset;

  if (file == NULL) { return EINVAL; }

  rc = fgetpos(file, &offset);
  if (rc != 0 ) { return rc; }

  if (fscanf(file, "%u %u %u", &file_w, &file_h, &file_o)  
      != NO_FILE_POS_VALUES) { return EIO; }

  rc = fsetpos(file, &offset);
  if (rc != 0 ) { return rc; }

  *width = file_w;
  *height = file_h;
  *data_offset = file_o;

  return 0;
}