Make busybox an optional applet
If it's disabled, code shrinks by about 900 bytes:
function old new delta
usr_bin 10 - -10
usr_sbin 11 - -11
install_dir 20 - -20
applet_install_loc 184 - -184
run_applet_and_exit 686 21 -665
------------------------------------------------------------------------------
(add/remove: 0/4 grow/shrink: 0/1 up/down: 0/-890) Total: -890 bytes
text data bss dec hex filename
911327 493 7336 919156 e0674 busybox_old
909848 493 7336 917677 e00ad busybox_unstripped
but busybox executable by itself does not say anything useful:
$ busybox
busybox: applet not found
Based on the patch by Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index b682e6b..281123c 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -701,7 +701,7 @@
continue;
}
}
-# else
+# elif ENABLE_BUSYBOX
static void install_links(const char *busybox UNUSED_PARAM,
int use_symbolic_links UNUSED_PARAM,
char *custom_install_dir UNUSED_PARAM)
@@ -709,6 +709,7 @@
}
# endif
+# if ENABLE_BUSYBOX
/* If we were called as "busybox..." */
static int busybox_main(char **argv)
{
@@ -784,10 +785,10 @@
const char *a = applet_names;
dup2(1, 2);
while (*a) {
-# if ENABLE_FEATURE_INSTALLER
+# if ENABLE_FEATURE_INSTALLER
if (argv[1][6]) /* --list-full? */
full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
-# endif
+# endif
full_write2_str(a);
full_write2_str("\n");
i++;
@@ -843,6 +844,7 @@
/* POSIX: "If a command is not found, the exit status shall be 127" */
exit(127);
}
+# endif
void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
{
@@ -886,8 +888,10 @@
{
int applet;
+# if ENABLE_BUSYBOX
if (is_prefixed_with(name, "busybox"))
exit(busybox_main(argv));
+# endif
/* find_applet_by_name() search is more expensive, so goes second */
applet = find_applet_by_name(name);
if (applet >= 0)