shell: add functionality to exit

source/shell/cmd.c

@@ -4,13 +4,25 @@
 
 #include <shell.h>
 
+static int should_exit = 0;
+static void do_exit(const char *s);
+
 struct cmd main_cmds[] = {
+	{ "exit", do_exit },
+	{ "quit", do_exit },
 	{ "flash", do_flash_cmd },
 	{ "ftl", do_ftl_cmd },
 	{ "mufs", do_mufs_cmd },
 	{ NULL, NULL },
 };
 
+static void do_exit(const char *s)
+{
+	(void)s;
+
+	should_exit = 1;
+}
+
 static char *prompt(const char *prefix)
 {
 	char *alloc, *line;
@@ -69,7 +81,9 @@ void cmd_loop(const char *show)
 {
 	char *line;
 
-	while (1) {
+	should_exit = 0;
+
+	while (!should_exit) {
 		line = prompt(show);
 		cmd_exec(main_cmds, line);
 		free(line);