main.c

gameboy 模拟器的源代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *strdup();

#include <stdarg.h>
#include <signal.h>

#include "input.h"
#include "rc.h"
#include "hw.h"

#include "Version"

static char *defaultconfig[] =
{
	"bind esc quit",
	"bind up +up",
	"bind down +down",
	"bind left +left",
	"bind right +right",
	"bind d +a",
	"bind s +b",
	"bind enter +start",
	"bind space +select",
	"bind tab +select",
	"bind joyup +up",
	"bind joydown +down",
	"bind joyleft +left",
	"bind joyright +right",
	"bind joy0 +b",
	"bind joy1 +a",
	"bind joy2 +select",
	"bind joy3 +start",
	"bind 1 \"set saveslot 1\"",
	"bind 2 \"set saveslot 2\"",
	"bind 3 \"set saveslot 3\"",
	"bind 4 \"set saveslot 4\"",
	"bind 5 \"set saveslot 5\"",
	"bind 6 \"set saveslot 6\"",
	"bind 7 \"set saveslot 7\"",
	"bind 8 \"set saveslot 8\"",
	"bind 9 \"set saveslot 9\"",
	"bind 0 \"set saveslot 0\"",
	"bind ins savestate",
	"bind del loadstate",
	"source gnuboy.rc",
	NULL
};


static void banner()
{
	printf("\ngnuboy " VERSION "\n");
}

static void copyright()
{
	banner();
	printf(
"Copyright (C) 2000-2001 Laguna and Gilgamesh\n"
"Portions contributed by other authors; see CREDITS for details.\n"
"\n"
"This program is free software; you can redistribute it and/or modify\n"
"it under the terms of the GNU General Public License as published by\n"
"the Free Software Foundation; either version 2 of the License, or\n"
"(at your option) any later version.\n"
"\n"
"This program is distributed in the hope that it will be useful,\n"
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
"GNU General Public License for more details.\n"
"\n"
"You should have received a copy of the GNU General Public License\n"
"along with this program; if not, write to the Free Software\n"
"Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\n"
"\n");
}

static void usage(char *name)
{
	copyright();
	printf("Type %s --help for detailed help.\n\n", name);
	exit(1);
}

static void copying()
{
	copyright();
	exit(0);
}

static void help(char *name)
{
	banner();
	printf("Usage: %s [options] romfile\n", name);
	printf("\n"
"      --source FILE             read rc commands from FILE\n"
"      --bind KEY COMMAND        bind KEY to perform COMMAND\n"
"      --VAR=VALUE               set rc variable VAR to VALUE\n"
"      --VAR                     set VAR to 1 (turn on boolean options)\n"
"      --no-VAR                  set VAR to 0 (turn off boolean options)\n"
"      --showvars                list all available rc variables\n"
"      --help                    display this help and exit\n"
"      --version                 output version information and exit\n"
"      --copying                 show copying permissions\n"
"");
	exit(0);
}


static void version(char *name)
{
	printf("%s-" VERSION "\n", name);
	exit(0);
}


void doevents()
{
	event_t ev;
	int st;

	ev_poll();
	while (ev_getevent(&ev))
	{
		if (ev.type != EV_PRESS && ev.type != EV_RELEASE)
			continue;
		st = (ev.type != EV_RELEASE);

		switch (ev.code)
			{
			case K_UP:
			pad_set(PAD_UP, st); break;
			case K_DOWN:
			pad_set(PAD_DOWN, st); break;
			case K_LEFT:
			pad_set(PAD_LEFT, st); break;
			case K_RIGHT:
			pad_set(PAD_RIGHT, st); break;
			case 's':
			pad_set(PAD_A, st); break;
			case 'd':
			pad_set(PAD_B, st); break;
			case K_ENTER:
			pad_set(PAD_START, st); break;
			case K_SPACE:
			pad_set(PAD_SELECT, st); break;
			case K_ESC:
				exit_emulator();
			case K_CTRL:
				if (st)						
					set_paused(1);
				break;
			};
	}
}


void doevents_paused()
	{
	ev_poll_paused();
	}


static void shutdown()
{
	vid_close();
	pcm_close();
}

void die(char *fmt, ...)
{

	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	exit(1);

}

static int bad_signals[] =
{
	/* These are all standard, so no need to #ifdef them... */
	SIGINT, SIGSEGV, SIGTERM, SIGFPE, SIGABRT, SIGILL,
#ifdef SIGQUIT
	SIGQUIT,
#endif
#ifdef SIGPIPE
	SIGPIPE,
#endif
	0
};

static void fatalsignal(int s)
{
	gb_leave(-2);
//	die("Signal %d\n", s);
}

static void catch_signals()
{
	int i;
	for (i = 0; bad_signals[i]; i++)
		signal(bad_signals[i], fatalsignal);
}



static char *base(char *s)
{
	char *p;
	p = strrchr(s, '/');
	if (p) return p+1;
	return s;
}


int gb_main(int argc, char *argv[])
{
	int i;
	char *opt, *arg, *cmd, *s, *rom = 0;

	/* Avoid initializing video if we don't have to */
	
	/* If we have special perms, drop them ASAP! */
	vid_preinit();

	/* FIXME - make interface modules responsible for atexit() */
	atexit(shutdown);
	catch_signals();
	vid_init();
	pcm_init();

	
	loader_init(rom);
	

	emu_reset();
	emu_run();

	/* never reached */
	return 0;
}