console.h

// requires windows.h

#define console_print_const(c, msg) \
	console_write(c, msg, sizeof(msg))

typedef struct {
	HANDLE stdout;
} Console;

static void console_init(Console *c)
{
	AllocConsole();
	c->stdout = GetStdHandle(STD_OUTPUT_HANDLE);
}

static void console_deinit(Console *c)
{
	FreeConsole();
}

static unsigned long console_write(Console *c, void *msg, size_t len)
{
	unsigned long n;
	WriteConsoleA(c->stdout, msg, len, &n, NULL);
	return n;
}

static unsigned long console_print(Console *c, void *msg)
{
	return console_write(c, msg, lstrlen(msg));
}

static unsigned long console_put(Console *c, char b)
{
	char msg[1] = {b};
	return console_write(c, msg, sizeof(msg));
}

static unsigned long console_println(Console *c, void *msg)
{
	unsigned long n;
	n = console_write(c, msg, lstrlen(msg));
	return n + console_put(c, '\n');
}

static unsigned long console_printu(Console *c, unsigned v)
{
	char *tp, *rtp;
	char t[11];
	size_t n;
	char x;
	if(v < 10) {
		return console_put(c, v+'0');
	}
	tp = rtp = t;
	while(v) {
		*tp++ = (v%10)+'0';
		v = v/10;
	}
	n = tp-t;
	tp--;
	while(tp > rtp) {
		x = *tp;
		*tp = *rtp;
		*rtp = x;
		tp--;
		rtp++;
	}
	return console_write(c, t, n);
}