matrix like message display animation

matrix_msg.c

void scr_about_init(void)
{
	w_about = newwin_title(0, WAV_HEIGHT, "About", false);

	for (i = 0; i < ARRAY_SIZE(about_lines); i++) {
		linecd[i] = malloc(strlen(about_lines[i]) * sizeof(int));
		for (j = 0; j < strlen(about_lines[i]); j++)
			linecd[i][j] = (rand() / (float)RAND_MAX) * 120 + 60;
	}
}

int scr_about_loop(WINDOW *w_menu)
{
	char buf[0x100];

	for (i = 0; i < ARRAY_SIZE(about_lines); i++) {
		for (j = 0; j < strlen(about_lines[i]); j++) {
			if (linecd[i][j] > 60) {
				buf[j] = ' ';
				linecd[i][j]--;
			} else if (linecd[i][j]) {
				buf[j] = (rand() / (float)RAND_MAX) * 54 + 65;
				linecd[i][j]--;
			} else {
				buf[j] = about_lines[i][j];
			}
		}
		buf[j] = '\0';
		waddstr_center(w_about, (WAV_HEIGHT - ARRAY_SIZE(about_lines))/2 + i, buf);
	}
	wrefresh(w_about);
	return wgetch(w_menu);
}

void scr_about_fini(void)
{
	delwin(w_about);
	for (i = 0; i < ARRAY_SIZE(about_lines); i++)
		free(linecd[i]);
}