Add the process_cmdline(), show_version() and show_usage() functions

src/trader.c

@@ -34,6 +34,16 @@
 #include "trader.h"
 
 
+/************************************************************************
+*                    Internal function declarations                     *
+************************************************************************/
+
+int main (int argc, char *argv[]);
+static void process_cmdline (int argc, char *argv[]);
+static void show_version (void);
+static void show_usage (int status);
+
+
 /************************************************************************
 *                             Main program                              *
 ************************************************************************/
@@ -42,10 +52,150 @@ int main (int argc, char *argv[])
 {
     init_program_name(argv);
 
+    // Process command line arguments
+    process_cmdline(argc, argv);
+
+
     // Testing...
-    printf("program_name:   %s\n", program_name());
-    printf("home_directory: %s\n", home_directory());
-    printf("data_directory: %s\n", data_directory());
+    printf(_("Program name:   %s\n"), program_name());
+    printf(_("Home directory: %s\n"), home_directory());
+    printf(_("Data directory: %s\n"), data_directory());
 
     return EXIT_SUCCESS;
 }
+
+
+/************************************************************************
+*                        Command line processing                        *
+************************************************************************/
+
+/* Constants for command line options */
+
+static const char options_short[] = "hV?";
+    /* -h, -?   --help
+       -V       --version
+    */
+
+static struct option const options_long[] = {
+    { "help",    no_argument, NULL, 'h' },
+    { "version", no_argument, NULL, 'V' },
+    { NULL,      0,           NULL, 0 }
+};
+
+
+/*-----------------------------------------------------------------------
+  Function:   process_cmdline  - Process command line arguments
+  Arguments:  argc             - Same as passed to main()
+              argv             - Same as passed to main()
+  Returns:    (nothing)
+
+  This function processes the command line arguments passed through argc
+  and argv, setting global variables as appropriate.
+*/
+
+static void process_cmdline (int argc, char *argv[])
+{
+    int c;
+
+    // Process arguments starting with "-" or "--"
+    opterr = TRUE;
+    while (TRUE) {
+	c = getopt_long(argc, argv, options_short, options_long, NULL);
+	if (c == EOF)
+	    break;
+
+	switch (c) {
+	case 'h':
+	case '?':
+	    /* -h, -?, --help: show help */
+	    show_usage(EXIT_SUCCESS);
+
+	case 'V':
+	    /* -V, --version: show version information */
+	    show_version();
+
+	default:
+	    show_usage(EXIT_FAILURE);
+	}
+    }
+
+    // Process remaining arguments
+
+    if ((optind < argc) && (argv[optind] != NULL)) {
+    }
+}
+
+
+/*-----------------------------------------------------------------------
+  Function:   show_version  - Show program version information
+  Arguments:  (none)
+  Returns:    (nothing)
+
+  This function displays version information about this program, then
+  terminates.
+*/
+
+static void show_version (void)
+{
+    printf(_("\
+" PACKAGE_NAME " (%s) %s\n\
+Copyright (C) %s, John Zaitseff.\n\
+\n\
+Star Traders is a simple game of interstellar trading, where the object\n\
+of the game is to create companies, buy and sell shares, borrow and repay\n\
+money, in order to become the wealthiest player (the winner).\n\
+\n\
+This program is free software that is distributed under the terms of the\n\
+GNU General Public License, version 3 or later.  You are welcome to\n\
+modify and/or distribute it under certain conditions.  This program has\n\
+NO WARRANTY, to the extent permitted by law; see the License for details.\n\
+"), program_name(), PACKAGE_VERSION, "1990-2011");
+
+    exit(EXIT_SUCCESS);
+}
+
+
+/*-----------------------------------------------------------------------
+  Function:   show_usage  - Show command line usage information
+  Arguments:  status      - Exit status
+  Returns:    (nothing)
+
+  This function displays usage information to standard output or standard
+  error, then terminates.
+*/
+
+static void show_usage (int status)
+{
+    if (status != EXIT_SUCCESS) {
+	fprintf(stderr, _("Try `%s --help' for more information.\n"),
+		program_name());
+    } else {
+	printf(_("Usage: %s [OPTION ...] [GAME]\n"), program_name());
+	printf(_("\
+Play Star Traders, a simple game of interstellar trading.\n\n\
+"));
+	printf(_("\
+Options:\n\
+  -V, --version   output version information and exit\n\
+  -h, --help      display this help and exit\n\n\
+"));
+	printf(_("\
+If GAME is specified as a number between 1 and 9, load and continue\n\
+playing that game.  If GAME is not specified, start a new game.\n\n\
+"));
+
+#ifdef PACKAGE_AUTHOR
+	printf(_("Report bugs to %s <%s>.\n"), PACKAGE_AUTHOR, PACKAGE_BUGREPORT);
+#else
+	printf(_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+#endif
+#ifdef PACKAGE_PACKAGER_BUG_REPORTS
+	printf(_("Report %s bugs to <%s>.\n"), PACKAGE_PACKAGER, PACKAGE_PACKAGER_BUG_REPORTS);
+#endif
+#ifdef PACKAGE_URL
+	printf(_("Star Traders home page: <%s>.\n"), PACKAGE_URL);
+#endif
+    }
+
+    exit(status);
+}