commands take buf, bad commmands dont segfault

c_quit.c

@@ -1,4 +1,5 @@
 void
-c_quit() {
+c_quit(char *b) {
 	exit(0);
 }
+

commands.c

@@ -1,3 +1,3 @@
-void (*commands[256])() = {
+void (*commands[256])(char *) = {
 NULL,
 ['q'] = c_quit,

efn.h

@@ -1,4 +1,7 @@
-extern void (*commands[256])();
+#include <stdlib.h>
+#include "globals.h"
 
-void c_quit();
+extern void (*commands[256])(char *);
+
+void c_quit(char *);
 

main.c

@@ -1,10 +1,11 @@
 int
 main(int argc, char **argv) {
 	static char buf[256];
-	while (1) {
+	while(1) {
 		char *com = fgets(buf, sizeof(buf), stdin);
 		if (com != NULL) {
-			commands[com[0]]();
+			if (commands[com[0]] != NULL) commands[com[0]](buf);
+			else puts("invalid command.");
 		}
 	}
 	return 0;