From acf448d4f67f997828b72699ae9d56279dbea896 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sun, 9 Jul 2006 17:03:07 +0000
Subject: [PATCH] Bugfix from Shaun Jackman (check that argv[optind] isn't null
 before dereferencing it) plus a bunch of tweaks from me.

---
 shell/lash.c | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/shell/lash.c b/shell/lash.c
index 83baee29d..c5aaf1d1f 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -1498,6 +1498,8 @@ static void free_memory(void)
 		remove_job(&job_list, job_list.fg);
 	}
 }
+#else
+void free_memory(void);
 #endif
 
 #ifdef CONFIG_LASH_JOB_CONTROL
@@ -1528,7 +1530,7 @@ static void setup_job_control(void)
 	/* Put ourselves in our own process group.  */
 	setsid();
 	shell_pgrp = getpid ();
-	setpgid (shell_pgrp, shell_pgrp);
+	setpgid(shell_pgrp, shell_pgrp);
 
 	/* Grab control of the terminal.  */
 	tcsetpgrp(shell_terminal, shell_pgrp);
@@ -1577,7 +1579,7 @@ int lash_main(int argc_l, char **argv_l)
 				argv = argv+optind;
 				break;
 			case 'i':
-				interactive = TRUE;
+				interactive++;
 				break;
 			default:
 				bb_show_usage();
@@ -1591,18 +1593,18 @@ int lash_main(int argc_l, char **argv_l)
 	 *    standard output is a terminal
 	 *    Refer to Posix.2, the description of the `sh' utility. */
 	if (argv[optind]==NULL && input==stdin &&
-			isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
-		interactive=TRUE;
+			isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))
+	{
+		interactive++;
 	}
 	setup_job_control();
-	if (interactive==TRUE) {
-		//printf( "optind=%d  argv[optind]='%s'\n", optind, argv[optind]);
+	if (interactive) {
 		/* Looks like they want an interactive shell */
-#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
-		printf( "\n\n%s Built-in shell (lash)\n", BB_BANNER);
-		printf( "Enter 'help' for a list of built-in commands.\n\n");
-#endif
-	} else if (local_pending_command==NULL) {
+		if (!ENABLE_FEATURE_SH_EXTRA_QUIET) {
+			printf( "\n\n%s Built-in shell (lash)\n", BB_BANNER);
+			printf( "Enter 'help' for a list of built-in commands.\n\n");
+		}
+	} else if (!local_pending_command && argv[optind]) {
 		//printf( "optind=%d  argv[optind]='%s'\n", optind, argv[optind]);
 		input = bb_xfopen(argv[optind], "r");
 		/* be lazy, never mark this closed */
@@ -1614,15 +1616,10 @@ int lash_main(int argc_l, char **argv_l)
 	if (!cwd)
 		cwd = bb_msg_unknown;
 
-#ifdef CONFIG_FEATURE_CLEAN_UP
-	atexit(free_memory);
-#endif
+	if (ENABLE_FEATURE_CLEAN_UP) atexit(free_memory);
 
-#ifdef CONFIG_FEATURE_COMMAND_EDITING
-	cmdedit_set_initial_prompt();
-#else
-	PS1 = NULL;
-#endif
+	if (ENABLE_FEATURE_COMMAND_EDITING) cmdedit_set_initial_prompt();
+	else PS1 = NULL;
 
 	return (busy_loop(input));
 }