Simple wrapping of mvwprintw-like using va_list in ncurses

va_list_ncurses.c

/*
 * This is a simple example of va_list function in ncurses.
 * I use it to wrap mvwprintw() and print something in a footer.
 *
 * How to run:
 *	gcc -o test va_list_ncurses.c -lncurses
 */
#include <ncurses.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>

static WINDOW *win;

void print_in_footer(bool is_error, const char *fmt, ...)
{
	va_list args;

	mvwprintw(win, 22, 1, (is_error ? "[ERROR] " : "[INFO] "));
	va_start(args, fmt);
	assert(fmt != NULL);
	assert(args != NULL);
	vwprintw(win, fmt, args);
	va_end(args);
	wprintw(win, "\n");
	wrefresh(win);
}

int main()
{
	int ch;
	bool err = false;

	initscr();
	noecho();
	cbreak();
	win = newwin(24, 80, 0, 0);
	box(win, 0, 0);
	refresh();
	print_in_footer(false, "Press q to exit and any other key to print"
			" something in the footer.");

	while ((ch = getch()) != 'q')
		print_in_footer((err = !err), "hello %d, %s" , 23, "hey");

	endwin();
	return 0;
}