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/* Copyright (C) 1998 Jim Hall <jhall1@isd.net>
* Copyright (C) 2008 Bradley Smith <brad@brad-smith.co.uk>
*
* GNU Robots game engine. This is the main() program, using GNU
* Guile as the backend to handle the language.
*
* GNU Robots is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNU Robots is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Robots. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h> /* for getopt */
#include <string.h> /* for strdup */
#include <glib.h>
#include <glib/gprintf.h>
#include <libguile.h>
#include <getopt.h> /* for GNU getopt_long */
#include "grobot.h" /* the robot structure, and robot manipulation
routines */
#include "api.h" /* robot API, as Scheme functions */
#include "ui-cmdwin.h"
#include "ui-arena.h"
#include "ui-window.h"
#include "ui-window-private.h"
#include "config.h"
#include "configs.h"
#include "map.h" /* Game Map */
#include "main.h" /* for this source file */
#define BUFF_LEN 1024
/* Globals (share with api.c) */
GList *robots = NULL;
GRobot *robot = NULL; /* The current robot */
UIWindow *ui;
UIArena *arena;
Map *map;
gpointer callback(gpointer data);
SCM catch_handler(void *data, SCM tag, SCM throw_args);
gint is_file_readable(const gchar * filename);
/************************************************************************
* gint main(gint argc, gchar *argv[]) *
* *
* Entry point *
************************************************************************/
gint main(gint argc, gchar *argv[])
{
gint opt; /* the option read from getopt */
gint flag; /* flag passed back from getopt - NOT USED */
gchar maps_path[MAX_PATH], scripts_path[MAX_PATH];
gchar *main_argv[5] = { "GNU Robots",
NULL,
NULL,
NULL,
NULL
};
struct option long_opts[] = {
{"version", 0, NULL, 'V'},
{"help", 0, NULL, 'h'},
{"map-file", 1, NULL, 'f'},
{"shields", 1, NULL, 's'},
{"energy", 1, NULL, 'e'},
{NULL, 0, NULL, 0}
};
/* Initialize the GType system first */
g_type_init();
/* Check command line */
/* Create a robot Object */
robot = g_robot_new(1, 1, 1, 0, DEFAULT_ENERGY, DEFAULT_SHIELDS, 0, 0,
NULL, NULL);
g_assert(robot != NULL);
/* And add to to the list of robots */
robots = g_list_append(robots, robot);
while ((opt = getopt_long(argc, argv, "Vhf:s:e:p:", long_opts,
&flag)) != EOF)
{
switch (opt)
{
case 'V':
/* Display version, then quit */
g_printf("%s\n\n", PKGINFO);
g_printf("%s\n\n", COPYRIGHT);
g_printf
("GNU Robots 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 3 of the License, or\n"
"(at your option) any later version.\n");
g_printf
("\nGNU Robots 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");
g_printf
("\nYou should have received a copy of the GNU General Public License\n"
"along with GNU Robots. If not, see <http://www.gnu.org/licenses/>.\n");
exit(0);
break;
case 'h':
/* Display help, then quit. */
usage(argv[0]);
exit(0);
break;
case 'f':
/* Set map file */
main_argv[1] = optarg; /* pointer assignment */
break;
case 's':
/* Set shields */
robot->shields = (glong) atol(optarg);
break;
case 'e':
/* Set energy */
robot->energy = (glong) atol(optarg);
break;
default:
/* invalid option */
usage(argv[0]);
exit(1);
break;
} /* switch */
} /* while */
/* Extra arg is the Scheme file */
if (optind < argc)
{
/* Set Scheme file */
main_argv[2] = argv[optind]; /* pointer assignment */
}
/* Check that files have been given */
if (main_argv[1] == NULL)
{
main_argv[1] = g_malloc(MAX_PATH);
g_strlcpy(main_argv[1], DEFAULT_MAP, MAX_PATH);
g_fprintf(stderr, "map file not specified, trying default: %s\n",
main_argv[1]);
}
/* Check that files exist */
g_strlcpy(maps_path, main_argv[1], MAX_PATH);
if (!is_file_readable(maps_path))
{
g_strlcpy(maps_path, MAPS_PATH, MAX_PATH);
g_strlcat(maps_path, "/", MAX_PATH);
g_strlcat(maps_path, main_argv[1], MAX_PATH);
if (!is_file_readable(maps_path))
{
gchar *env = getenv(MAPS_PATH_ENV);
if (env != NULL)
{
g_strlcpy(maps_path, env, MAX_PATH);
g_strlcat(maps_path, "/", MAX_PATH);
g_strlcat(maps_path, main_argv[1], MAX_PATH);
if (!is_file_readable(maps_path))
{
g_fprintf(stderr,
"%s: %s: game map file does not exist or is not readable\n",
argv[0], main_argv[1]);
exit(1);
}
}
else
{
g_fprintf(stderr,
"%s: %s: game map file does not exist or is not readable\n",
argv[0], main_argv[1]);
exit(1);
}
}
}
main_argv[1] = maps_path;
/* Now the Scheme file */
if (main_argv[2] != NULL)
{
g_strlcpy(scripts_path, main_argv[2], MAX_PATH);
if (!is_file_readable(scripts_path))
{
g_strlcpy(scripts_path, SCRIPTS_PATH, MAX_PATH);
g_strlcat(scripts_path, "/", MAX_PATH);
g_strlcat(scripts_path, main_argv[2], MAX_PATH);
if (!is_file_readable(scripts_path))
{
gchar *env = getenv(SCRIPTS_PATH_ENV);
if (env != NULL)
{
g_strlcpy(scripts_path, env, MAX_PATH);
g_strlcat(scripts_path, "/", MAX_PATH);
g_strlcat(scripts_path, main_argv[2], MAX_PATH);
if (!is_file_readable(scripts_path))
{
g_fprintf(stderr,
"%s: %s: Scheme file does not exist or is not readable\n",
argv[0], main_argv[2]);
exit(1);
}
}
else
{
g_fprintf(stderr,
"%s: %s: Scheme file does not exist or is not readable\n",
argv[0], main_argv[2]);
exit(1);
}
}
}
main_argv[2] = scripts_path;
}
else
{
/* argv[2] can't be NULL as argv[3] may also be NULL */
main_argv[2] = "";
}
/* Start Guile environment. Does not exit */
g_printf("%s\n", PKGINFO);
g_printf("%s\n", COPYRIGHT);
g_printf("GNU Robots comes with ABSOLUTELY NO WARRANTY\n");
g_printf
("This is free software, and you are welcome to redistribute it\n");
g_printf
("under certain conditions; see the file `COPYING' for details.\n");
g_printf("Loading Guile ... Please wait\n\n");
scm_boot_guile(3, main_argv, main_prog, NULL);
return 0; /* never gets here, but keeps compiler happy */
}
/************************************************************************
* void main_prog(void *closure, gint argc, gchar *argv[]) *
* *
* The main program code that is executed after Guile starts up. Pass *
* the Scheme program as argv[1] and the map file as argv[2]. The *
* program name is still argv[0]. *
************************************************************************/
void main_prog(void *closure, gint argc, gchar *argv[])
{
gchar *map_file = argv[1];
gchar *robot_program = argv[2];
gboolean loading = TRUE;
api_init();
g_printf("Map file: %s\n", map_file);
map = map_new_from_file(map_file, DEFAULT_MAP_ROWS,
DEFAULT_MAP_COLUMNS);
if (map == NULL)
{
exit_nicely();
}
g_thread_init(NULL);
gdk_threads_init();
g_thread_create(callback, &loading, FALSE, NULL);
/* ensure the robot is placed properly */
MAP_SET_OBJECT(map, G_ROBOT_POSITION_Y(robot),
G_ROBOT_POSITION_X(robot), ROBOT);
g_printf("Loading GTK Interface ... Please wait\n\n");
while(loading);
/* Now initialize the rest of the Robot properties */
g_object_set(G_OBJECT(robot),
"user-interface", G_OBJECT(arena), "map", G_OBJECT(map), NULL);
g_signal_connect(G_OBJECT(robot), "death", G_CALLBACK(death), NULL);
if (strlen(robot_program) != 0)
{
/* execute a Scheme file */
g_printf("Robot program: %s\n", robot_program);
scm_c_primitive_load(robot_program);
}
else
{
gchar buf[BUFF_LEN];
g_printf
("Robot program not specified. Entering interactive mode..\n");
while (1)
{
memset(&buf, 0, BUFF_LEN);
ui_cmdwin_get_string(UI_CMDWIN(ui->priv->cmdwin), "guile> ",
buf, BUFF_LEN);
scm_internal_catch(SCM_BOOL_T,
(scm_t_catch_body) scm_c_eval_string, buf,
catch_handler, NULL);
}
}
/* done */
exit_nicely();
}
gpointer callback(gpointer data)
{
gtk_init(0, NULL);
ui = UI_WINDOW(ui_window_new());
ui_window_postinit(ui, map);
arena = UI_ARENA(ui->priv->arena);
/* draw the map */
ui_arena_draw(arena);
ui_arena_update_status(arena, "Welcome to GNU Robots", -1, -1, -1);
*(gboolean*)data = FALSE;
gdk_threads_enter();
gtk_main();
gdk_threads_leave();
return NULL;
}
/************************************************************************
* SCM catch_handler (void *data, SCM tag, SCM throw_args); *
* *
* Responsible for handling errors *
************************************************************************/
SCM catch_handler(void *data, SCM tag, SCM throw_args)
{
/*
gchar *message = "Couldn't get error message\n";
if (scm_ilength (throw_args) > 1
&& SCM_NFALSEP (scm_string_p (SCM_CADR (throw_args))))
{
message = SCM_STRING_CHARS (SCM_CADR (throw_args));
}
else if (SCM_NFALSEP (scm_symbol_p (tag)))
{
message = SCM_SYMBOL_CHARS (tag);
}
user_interface_update_status (ui, message, -1, -1, -1);
*/
g_printf("Invalid Instruction\n");
return SCM_BOOL_F;
}
void death(GRobot *robot)
{
/* We get a ref increment on a signal */
g_object_unref(G_OBJECT(robot));
exit_nicely();
}
/************************************************************************
* void exit_nicely() *
* *
* A function that allows the program to exit nicely, after freeing all *
* memory pointers, etc. *
************************************************************************/
void exit_nicely()
{
glong score, energy, shields, shots, units;
/* Stop the UI */
if (ui != NULL)
{
g_object_unref(G_OBJECT(ui));
}
/* Get rid of the map object */
if (map != NULL)
{
g_object_unref(G_OBJECT(map));
}
/* Show statistics */
g_object_get(G_OBJECT(robot),
"shields", &shields,
"energy", &energy,
"units", &units, "shots", &shots, "score", &score, NULL);
g_list_foreach(robots, (GFunc) g_object_unref, NULL);
g_list_free(robots);
g_printf(
"\n-----------------------STATISTICS-----------------------\n");
g_printf("Shields: %ld\n", (shields < 0 ? 0 : shields));
g_printf("Energy: %ld\n", (energy < 0 ? 0 : energy));
g_printf("Units walked: %ld\n", (units < 0 ? 0 : units));
g_printf("Shots: %ld\n", (shots < 0 ? 0 : shots));
g_printf("Score: %ld\n", score);
/* Show results, if any */
if (shields < 1)
{
g_printf("** Robot took too much damage, and died.\n");
}
else if (energy < 1)
{
g_printf("** Robot ran out of energy.\n");
}
/* Quit program */
exit(0);
}
/************************************************************************
* void usage(const gchar *argv0) *
* *
* A function that prints the usage of GNU Robots to the user. Assume *
* text mode for this function. We have not initialized X Windows yet. *
************************************************************************/
void usage(const gchar *argv0)
{
g_printf("%s\n", PKGINFO);
g_printf("%s\n", COPYRIGHT);
g_printf
("Game/diversion where you construct a program for a little robot\n");
g_printf
("then set him loose and watch him explore a world on his own.\n\n");
g_printf("Usage: %s [OPTION]... [FILE]\n\n", argv0);
g_printf(" -f, --map-file=FILE Load map file\n");
g_printf(" -s, --shields=N Set initial shields to N\n");
g_printf(" -e, --energy=N Set initial energy to N\n");
g_printf
(" -V, --version Output version information and exit\n");
g_printf(" -h, --help Display this help and exit\n");
g_printf("\nNote: FILE refers to a scheme file and %s enters into \n",
argv0);
g_printf(" interactive mode if it is not specified.\n");
g_printf("\nReport bugs to <%s>.\n", PACKAGE_BUGREPORT);
}
/************************************************************************
* gint is_file_readable (const gchar *filename) *
* *
* Checks if a file is a readable file. We will use this function as *
* part of a sanity check, before we get anywhere near having to open *
* files. This will save on error checking later on, when we may have *
* already initialized another environment (Curses, X Windows, ...) *
************************************************************************/
gint is_file_readable(const gchar *filename)
{
FILE *stream;
stream = fopen(filename, "r");
if (stream == NULL)
{
/* Failed */
return (0);
}
/* Success */
fclose(stream);
return (1);
}
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