Implement the --max-turn command line option

src/game.c

@@ -381,7 +381,7 @@ void init_game (void)
 
 	    // Miscellaneous initialisation
 	    interest_rate = INITIAL_INTEREST_RATE;
-	    max_turn = DEFAULT_MAX_TURN;
+	    max_turn = option_max_turn ? option_max_turn : DEFAULT_MAX_TURN;
 	    turn_number = 1;
 
 	    // Select who is to go first

src/globals.c

@@ -86,3 +86,8 @@ bool	quit_selected	= false;	// Is a player trying to quit the game?
 bool	abort_game	= false;	// Abort game without declaring winner?
 
 bool	option_no_color = false;	// True if --no-color was specified
+int	option_max_turn = 0;		// Max. turns if --max-turn was specified
+
+
+/***********************************************************************/
+// End of file

src/globals.h

@@ -45,6 +45,7 @@
 
 #define NUMBER_MOVES		20	// Number of choices on map per turn
 #define DEFAULT_MAX_TURN	50	// Default number of turns per game
+#define MIN_MAX_TURN		10	// Minimum that can be specified for max_turn
 
 #define MAX_PLAYERS		8	// Maximum number of players
 #define INITIAL_CASH		6000.00	// Initial cash per player
@@ -197,6 +198,7 @@ extern bool	quit_selected;		// Is a player trying to quit the game?
 extern bool	abort_game;		// Abort game without declaring winner?
 
 extern bool	option_no_color;	// True if --no-color was specified
+extern int	option_max_turn;	// Max. turns if --max-turn was specified
 
 
 #endif /* included_GLOBALS_H */

src/trader.c

@@ -43,6 +43,7 @@
 
 enum options_char {
     OPTION_NO_COLOR = 1,
+    OPTION_MAX_TURN
 };
 
 static const char options_short[] = "hV";
@@ -54,6 +55,7 @@ static struct option const options_long[] = {
     { "version",   no_argument,       NULL, 'V' },
     { "no-color",  no_argument,       NULL, OPTION_NO_COLOR },
     { "no-colour", no_argument,       NULL, OPTION_NO_COLOR },
+    { "max-turn",  required_argument, NULL, OPTION_MAX_TURN },
     { NULL,        0,                 NULL, 0 }
 };
 
@@ -187,6 +189,8 @@ int main (int argc, char *argv[])
 void process_cmdline (int argc, char *argv[])
 {
     int c;
+    char *p;
+
 
     // Process arguments starting with "-" or "--"
     opterr = true;
@@ -211,6 +215,17 @@ void process_cmdline (int argc, char *argv[])
 	    option_no_color = true;
 	    break;
 
+	case OPTION_MAX_TURN:
+	    // --max-turn: specify the maximum turn number
+	    option_max_turn = strtol(optarg, &p, 10);
+
+	    if (option_max_turn < MIN_MAX_TURN || p == NULL || *p != '\0') {
+		fprintf(stderr, "%s: invalid value for --max-turn: `%s'\n",
+			program_name(), optarg);
+		show_usage(EXIT_FAILURE);
+	    }
+	    break;
+
 	default:
 	    show_usage(EXIT_FAILURE);
 	}