void
print_with_fixed_tabs(Row *row) {
for (int i = 0; i < ROW_SIZE; i++) {
if(row->text[i] == 0) break;
if (row->text[i] == '\t') printf("    ");
else printf("%c", row->text[i]);
}
}

void
c_print(char *c, char **argv) {
       Row *row = buffer;
        int line = 1;
	if (atoi(c + 2) != 0) line = atoi(c + 2);
	row = b_getline(buffer, line);
	if (row == NULL) {puts("invalid line."); return;}
        for (;; line++) {
		printf("%3.i| ", line);
		print_with_fixed_tabs(row);
		puts("");
                if (row->n == NULL) break;
                row = row -> n;
        }
}