1 files changed, 35 insertions, 18 deletions

diff --git a/2ls10.c b/2ls10.c
index c3b0d70..118423f 100644
--- a/2ls10.c
+++ b/2ls10.c
@@ -1,18 +1,25 @@
+/**
+*
+* 2ls10: a clone of the popular 2048 game
+*
+* (c) 2019 - Vincenzo "KatolaZ" Nicosia <katolaz@freaknet.org>
+*
+* See COPYING for terms and conditions
+*
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
 #include <termios.h>
 #include <unistd.h>
 
-int st[1<<7], lo, li, ls;
-int m, pt, n, pl, t;
+#define cond(x) ((t) ? (x)/n : (x)%n)
+
+int st[1<<7], lo, li, ls, m, pt, n, pl, t;
 char nf;
 struct termios t1, t2;
 
-int cond (int j){
-	return t? j/n : j%n;
-}
-
 void clean(char *str){
 	if (str) printf("%s\n", str);
 	tcsetattr(0, TCSANOW, &t1);
@@ -108,21 +115,11 @@ void update(){
 	}
 }
 
-int main(int argc, char *argv[]){
- 	srand(time(NULL));	
- 	//srand(12345);
-	n = 4;
-	if (argc > 1) n = atoi(argv[1]);
-	nf = n * n;	
-	tcgetattr(0, &t1);
-	t2 = t1;
-	t2.c_lflag &= ~(ICANON | ECHO);
-	tcsetattr(0, TCSANOW, &t2);
+void play(){
 	set_rnd();
 	pt = 0;
 	pl = 1;
 	while(pl){
-		//pr_st();
 		set_rnd();
 		print_state();
 		switch(getchar()){
@@ -156,8 +153,28 @@ int main(int argc, char *argv[]){
 
 		}
 		update();
-
 	}
 	print_state();
 	clean("you won!");
 }
+
+
+int main(int argc, char *argv[]){
+ 	srand(time(NULL));	
+ 	//srand(12345);
+	n = 4;
+	if (argc > 1) {
+		n = atoi(argv[1]);
+		if (n< 2 || n > 16){
+			fprintf(stderr, "Usage: 2ls10 [2-16]\n");	
+			exit(1);
+		}
+	}
+	nf = n * n;	
+	tcgetattr(0, &t1);
+	t2 = t1;
+	t2.c_lflag &= ~(ICANON | ECHO);
+	tcsetattr(0, TCSANOW, &t2);
+
+	play();
+}