/* Simple program:  Loop, watching keystrokes

   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to 

   pump the event loop and catch keystrokes.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL.h"

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */

static void quit(int rc)

{

	SDL_Quit();

	exit(rc);

}

static void print_modifiers(void)

{

	int mod;

	printf(" modifiers:");

	mod = SDL_GetModState();

	if(!mod) {

		printf(" (none)");

		return;

	}

	if(mod & KMOD_LSHIFT)

		printf(" LSHIFT");

	if(mod & KMOD_RSHIFT)

		printf(" RSHIFT");

	if(mod & KMOD_LCTRL)

		printf(" LCTRL");

	if(mod & KMOD_RCTRL)

		printf(" RCTRL");

	if(mod & KMOD_LALT)

		printf(" LALT");

	if(mod & KMOD_RALT)

		printf(" RALT");

	if(mod & KMOD_LMETA)

		printf(" LMETA");

	if(mod & KMOD_RMETA)

		printf(" RMETA");

	if(mod & KMOD_NUM)

		printf(" NUM");

	if(mod & KMOD_CAPS)

		printf(" CAPS");

	if(mod & KMOD_MODE)

		printf(" MODE");

}

static void PrintKey(SDL_keysym *sym, int pressed)

{

	/* Print the keycode, name and state */

	if ( sym->sym ) {

		printf("Key %s:  %d-%s ", pressed ?  "pressed" : "released",

					sym->sym, SDL_GetKeyName(sym->sym));

	} else {

		printf("Unknown Key (scancode = %d) %s ", sym->scancode,

					pressed ?  "pressed" : "released");

	}

	/* Print the translated character, if one exists */

	if ( sym->unicode ) {

		/* Is it a control-character? */

		if ( sym->unicode < ' ' ) {

			printf(" (^%c)", sym->unicode+'@');

		} else {

#ifdef UNICODE

			printf(" (%c)", sym->unicode);

#else

			/* This is a Latin-1 program, so only show 8-bits */

			if ( !(sym->unicode & 0xFF00) )

				printf(" (%c)", sym->unicode);

			else

				printf(" (0x%X)", sym->unicode);

#endif

		}

	}

	print_modifiers();

	printf("\n");

}

int main(int argc, char *argv[])

{

	SDL_Event event;

	int done;

	Uint32 videoflags;

	/* Initialize SDL */

	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {

		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());

		return(1);

	}

	videoflags = SDL_SWSURFACE;

	while( argc > 1 ) {

		--argc;

		if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {

			videoflags |= SDL_FULLSCREEN;

		} else {

			fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);

			quit(1);

		}

	}

	/* Set 640x480 video mode */

	if ( SDL_SetVideoMode(640, 480, 0, videoflags) == NULL ) {

		fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",

							SDL_GetError());

		quit(2);

	}

	/* Enable UNICODE translation for keyboard input */

	SDL_EnableUNICODE(1);

	/* Enable auto repeat for keyboard input */

	SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,

	                    SDL_DEFAULT_REPEAT_INTERVAL);

	/* Watch keystrokes */

	done = 0;

	while ( !done ) {

		/* Check for events */

		SDL_WaitEvent(&event);

		switch (event.type) {

			case SDL_KEYDOWN:

				PrintKey(&event.key.keysym, 1);

				break;

			case SDL_KEYUP:

				PrintKey(&event.key.keysym, 0);

				break;

			case SDL_MOUSEBUTTONDOWN:

				/* Any button press quits the app... */

			case SDL_QUIT:

				done = 1;

				break;

			default:

				break;

		}

	}

	SDL_Quit();

	return(0);

}