General cleanup of command line parsing to allow "busybox" to work as a prefix.

(I.E. any argv[0] that starts with "busybox" winds up in busybox_main().)

Added testing/busybox.tests which tests the following permutations:

./busybox
./busybox-suffix
./busybox cat
./busybox-suffix cat
./busybox --help
./busybox-suffix --help
./busybox --help cat
./busybox-suffix --help cat
./busybox --help unknown
./busybox-suffix --help unknown
./unknown

Also repair the test suite so ./runtest calls the ".tests" scripts properly.

Note: you can now go "busybox busybox busbox ls -l" and it'll take it.  The
new code is pretty generic.  I can block that if anybody can come up with a
good reason to...

2 files changed, 58 insertions, 123 deletions

diff --git a/applets/applets.c b/applets/applets.c
index ce9ecbbc5..21b0c3dbc 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -90,8 +90,7 @@ static int suid_cfg_readable;
 
 
 
-extern void
-bb_show_usage (void)
+extern void bb_show_usage (void)
 {
   const char *format_string;
   const char *usage_string = usage_messages;
@@ -112,8 +111,7 @@ bb_show_usage (void)
   exit (EXIT_FAILURE);
 }
 
-static int
-applet_name_compare (const void *x, const void *y)
+static int applet_name_compare (const void *x, const void *y)
 {
   const char *name = x;
   const struct BB_applet *applet = y;
@@ -123,47 +121,25 @@ applet_name_compare (const void *x, const void *y)
 
 extern const size_t NUM_APPLETS;
 
-struct BB_applet *
-find_applet_by_name (const char *name)
+struct BB_applet *find_applet_by_name (const char *name)
 {
   return bsearch (name, applets, NUM_APPLETS, sizeof (struct BB_applet),
 				  applet_name_compare);
 }
 
-void
-run_applet_by_name (const char *name, int argc, char **argv)
+void run_applet_by_name (const char *name, int argc, char **argv)
 {
-  static int recurse_level = 0;
-  extern int been_there_done_that;      /* From busybox.c */
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-  if (recurse_level == 0)
-	parse_config_file ();
-#endif
-
-  recurse_level++;
-  /* Do a binary search to find the applet entry given the name. */
-  if ((applet_using = find_applet_by_name (name)) != NULL) {
-	bb_applet_name = applet_using->name;
-	if (argv[1] && strcmp (argv[1], "--help") == 0) {
-	  if (strcmp (applet_using->name, "busybox") == 0) {
-		if (argv[2])
-		  applet_using = find_applet_by_name (argv[2]);
-		else
-		  applet_using = NULL;
-	  }
-	  if (applet_using)
-		bb_show_usage ();
-	  been_there_done_that = 1;
-	  busybox_main (0, NULL);
+	if(ENABLE_FEATURE_SUID_CONFIG) parse_config_file ();
+
+	if(!strncmp(name, "busybox", 7)) busybox_main(argc, argv);
+	/* Do a binary search to find the applet entry given the name. */
+	applet_using = find_applet_by_name(name);
+	if(applet_using) {
+		bb_applet_name = applet_using->name;
+		if(argc==2 && !strcmp(argv[1], "--help")) bb_show_usage ();
+		if(ENABLE_FEATURE_SUID) check_suid (applet_using);
+		exit ((*(applet_using->main)) (argc, argv));
 	}
-#ifdef CONFIG_FEATURE_SUID
-	check_suid (applet_using);
-#endif
-
-	exit ((*(applet_using->main)) (argc, argv));
-  }
-  recurse_level--;
 }
 
 
diff --git a/applets/busybox.c b/applets/busybox.c
index ee74b4c18..420c9c0e5 100644
--- a/applets/busybox.c
+++ b/applets/busybox.c
@@ -9,7 +9,6 @@
 #include <locale.h>
 #endif
 
-int been_there_done_that = 0; /* Also used in applets.c */
 const char *bb_applet_name;
 
 #ifdef CONFIG_FEATURE_INSTALLER
@@ -32,17 +31,6 @@ static const char* const install_dir[] = {
 /* abstract link() */
 typedef int (*__link_f)(const char *, const char *);
 
-/*
- * Where in the filesystem is this busybox?
- * [return]
- *		malloc'd string w/ full pathname of busybox's location
- *		NULL on failure
- */
-static inline char *busybox_fullpath(void)
-{
-	return xreadlink("/proc/self/exe");
-}
-
 /* create (sym)links for each applet */
 static void install_links(const char *busybox, int use_symbolic_links)
 {
@@ -72,41 +60,27 @@ int main(int argc, char **argv)
 {
 	const char *s;
 
-	bb_applet_name = argv[0];
-
-	if (bb_applet_name[0] == '-')
-		bb_applet_name++;
+	bb_applet_name=argv[0];
+	if (*bb_applet_name == '-') bb_applet_name++;
+	for (s = bb_applet_name; *s ;)
+		if (*(s++) == '/') bb_applet_name = s;
 
-	for (s = bb_applet_name; *s != '\0';) {
-		if (*s++ == '/')
-			bb_applet_name = s;
-	}
-
-#ifdef CONFIG_LOCALE_SUPPORT
-#ifdef CONFIG_INIT
-	if(getpid()!=1)	/* Do not set locale for `init' */
-#endif
-	{
+	/* Set locale for everybody except `init' */
+	if(ENABLE_LOCALE_SUPPORT && (!ENABLE_INIT || getpid()==1))
 		setlocale(LC_ALL, "");
-	}
-#endif
 
 	run_applet_by_name(bb_applet_name, argc, argv);
 	bb_error_msg_and_die("applet not found");
 }
 
-
 int busybox_main(int argc, char **argv)
 {
-	int col = 0, len, i;
-
-#ifdef CONFIG_FEATURE_INSTALLER
 	/*
 	 * This style of argument parsing doesn't scale well
 	 * in the event that busybox starts wanting more --options.
 	 * If someone has a cleaner approach, by all means implement it.
 	 */
-	if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
+	if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
 		int use_symbolic_links = 0;
 		int rc = 0;
 		char *busybox;
@@ -119,7 +93,7 @@ int busybox_main(int argc, char **argv)
 		}
 
 		/* link */
-		busybox = busybox_fullpath();
+		busybox = xreadlink("/proc/self/exe");
 		if (busybox) {
 			install_links(busybox, use_symbolic_links);
 			free(busybox);
@@ -128,60 +102,45 @@ int busybox_main(int argc, char **argv)
 		}
 		return rc;
 	}
-#endif /* CONFIG_FEATURE_INSTALLER */
-
-	argc--;
-
-	/* If we've already been here once, exit now */
-	if (been_there_done_that == 1 || argc < 1) {
-		const struct BB_applet *a = applets;
-		int output_width = 60;
-
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-		/* Obtain the terminal width.  */
-		get_terminal_width_height(0, &output_width, NULL);
-		/* leading tab and room to wrap */
-		output_width -= 20;
-#endif
 
-		printf("%s\n\n"
-		       "Usage: busybox [function] [arguments]...\n"
-		       "   or: [function] [arguments]...\n\n"
-		       "\tBusyBox is a multi-call binary that combines many common Unix\n"
-		       "\tutilities into a single executable.  Most people will create a\n"
-		       "\tlink to busybox for each function they wish to use and BusyBox\n"
-		       "\twill act like whatever it was invoked as!\n"
-		       "\nCurrently defined functions:\n", bb_msg_full_version);
-
-		while (a->name != 0) {
-			col +=
-				printf("%s%s", ((col == 0) ? "\t" : ", "),
-				       (a++)->name);
-			if (col > output_width && a->name != 0) {
-				printf(",\n");
-				col = 0;
+	/* Deal with --help.  (Also print help when called with no arguments) */
+	
+	if (argc==1 || !strcmp(argv[1],"--help") ) {
+		if (argc>2) run_applet_by_name(bb_applet_name=argv[2], argc, argv);
+		else {
+			const struct BB_applet *a;
+			int col, output_width;
+
+			if (ENABLE_FEATURE_AUTOWIDTH) {
+				/* Obtain the terminal width.  */
+				get_terminal_width_height(0, &output_width, NULL);
+				/* leading tab and room to wrap */
+				output_width -= 20;
+			} else output_width = 60;
+
+			printf("%s\n\n"
+			       "Usage: busybox [function] [arguments]...\n"
+			       "   or: [function] [arguments]...\n\n"
+			       "\tBusyBox is a multi-call binary that combines many common Unix\n"
+			       "\tutilities into a single executable.  Most people will create a\n"
+			       "\tlink to busybox for each function they wish to use and BusyBox\n"
+			       "\twill act like whatever it was invoked as!\n"
+			       "\nCurrently defined functions:\n", bb_msg_full_version);
+
+			col=0;
+			for(a = applets; a->name;) {
+				col += printf("%s%s", (col ? ", " : "\t"), (a++)->name);
+				if (col > output_width && a->name) {
+					printf(",\n");
+					col = 0;
+				}
 			}
+			printf("\n\n");
+			exit(0);
 		}
-		printf("\n\n");
-		exit(0);
-	}
-
-	/* Flag that we've been here already */
-	been_there_done_that = 1;
-
-	/* Move the command line down a notch */
-	/* Preserve pointers so setproctitle() works consistently */
-	len = argv[argc] + strlen(argv[argc]) - argv[1];
-	memmove(argv[0], argv[1], len);
-	memset(argv[0] + len, 0, argv[1] - argv[0]);
-
-	/* Fix up the argv pointers */
-	len = argv[1] - argv[0];
-	memmove(argv, argv + 1, sizeof(char *) * (argc + 1));
-	for (i = 0; i < argc; i++)
-		argv[i] -= len;
-
-	return (main(argc, argv));
+	} else run_applet_by_name(bb_applet_name=argv[1], argc-1, argv+1);
+	
+	bb_error_msg_and_die("applet not found");
 }
 
 /*