shell: make standalone shell tab-complete "busybox"

function                                             old     new   delta
busybox_main                                           -     624    +624
packed_usage                                       31758   31777     +19
applet_names                                        2638    2646      +8
applet_main                                         1528    1532      +4
applet_install_loc                                   191     192      +1
run_applet_and_exit                                  681      78    -603
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/1 up/down: 656/-603)           Total: 53 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 21 insertions, 6 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index b9fbbd1f2..7a1a7f005 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -760,11 +760,26 @@ static void install_links(const char *busybox UNUSED_PARAM,
 }
 # endif
 
-# if ENABLE_BUSYBOX
 static void run_applet_and_exit(const char *name, char **argv) NORETURN;
 
-/* If we were called as "busybox..." */
-static int busybox_main(char **argv)
+# if ENABLE_BUSYBOX
+#  if ENABLE_FEATURE_SH_STANDALONE && ENABLE_FEATURE_TAB_COMPLETION
+    /*
+     * Insert "busybox" into applet table as well.
+     * This makes standalone shell tab-complete this name too.
+     * (Otherwise having "busybox" in applet table is not necessary,
+     * there is other code which routes "busyboxANY_SUFFIX" name
+     * to busybox_main()).
+     */
+//usage:#define busybox_trivial_usage NOUSAGE_STR
+//usage:#define busybox_full_usage ""
+//applet:IF_BUSYBOX(IF_FEATURE_SH_STANDALONE(IF_FEATURE_TAB_COMPLETION(APPLET(busybox, BB_DIR_BIN, BB_SUID_MAYBE))))
+int busybox_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
+#  else
+#   define busybox_main(argc,argv) busybox_main(argv)
+static
+#  endif
+int busybox_main(int argc UNUSED_PARAM, char **argv)
 {
         if (!argv[1]) {
                 /* Called without arguments */
@@ -937,7 +952,7 @@ static NORETURN void run_applet_and_exit(const char *name, char **argv)
 {
 #  if ENABLE_BUSYBOX
         if (is_prefixed_with(name, "busybox"))
-                exit(busybox_main(argv));
+                exit(busybox_main(/*unused:*/ 0, argv));
 #  endif
 #  if NUM_APPLETS > 0
         /* find_applet_by_name() search is more expensive, so goes second */
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 2a5d4e704..e5721b063 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -776,7 +776,7 @@ static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
         }
         pf_len = strlen(pfind);
 
-#if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
+# if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
         if (type == FIND_EXE_ONLY && !dirbuf) {
                 const char *p = applet_names;
 
@@ -787,7 +787,7 @@ static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
                                 continue;
                 }
         }
-#endif
+# endif
 
         for (i = 0; i < npaths; i++) {
                 DIR *dir;