libbusybox: move (possibly compressed) help stuff into libbusybox.

Makes individual binaries much smaller.

6 files changed, 25 insertions, 153 deletions

diff --git a/Config.in b/Config.in
index b046812c7..74f8beae9 100644
--- a/Config.in
+++ b/Config.in
@@ -283,14 +283,15 @@ config STATIC
 config BUILD_LIBBUSYBOX
         bool "Build shared libbusybox"
         default n
+        depends on !FEATURE_PREFER_APPLETS
         help
-          Build a shared library libbusybox.so which contains all
-          libraries used inside busybox.
+          Build a shared library libbusybox.so.N.N.N which contains all
+          busybox code.
 
-          This is an experimental feature intended to support the upcoming
-          "make standalone" mode.  Enabling it against the one big busybox
-          binary serves no purpose (and increases the size).  You should
-          almost certainly say "no" to this right now.
+          This feature allows every applet to be built as a tiny
+          separate executable.  Enabling it for "one big busybox binary"
+          approach serves no purpose and increases code size.
+          You should almost certainly say "no" to this.
 
 ### config FEATURE_FULL_LIBBUSYBOX
 ###     bool "Feature-complete libbusybox"
diff --git a/applets/Kbuild b/applets/Kbuild
index cf7d29751..289c5def4 100644
--- a/applets/Kbuild
+++ b/applets/Kbuild
@@ -4,13 +4,13 @@
 #
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
-obj-y:=
-obj-y       += applets.o
+obj-y :=
+obj-y += applets.o
 
 hostprogs-y:=
 hostprogs-y += usage
 
-always:=    $(hostprogs-y)
+always:= $(hostprogs-y)
 
 # Generated files need additional love
 
diff --git a/applets/applets.c b/applets/applets.c
index f91884b13..49ad8599f 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -15,6 +15,7 @@
 #include <assert.h>
 #include "busybox.h"
 
+
 /* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
 #if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
 #warning Static linking against glibc produces buggy executables
@@ -27,32 +28,8 @@
 #endif
 
 
-/* Declare <applet>_main() */
-#define PROTOTYPES
-#include "applets.h"
-#undef PROTOTYPES
-
-#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
-/* Define usage_messages[] */
-static const char usage_messages[] ALIGN1 = ""
-#define MAKE_USAGE
-#include "usage.h"
-#include "applets.h"
-;
-#undef MAKE_USAGE
-#else
-#define usage_messages 0
-#endif /* SHOW_USAGE */
-
-/* Define struct bb_applet applets[] */
-#include "applets.h"
-/* The -1 arises because of the {0,NULL,0,-1} entry. */
-
-#if ENABLE_FEATURE_SH_STANDALONE
-const unsigned short NUM_APPLETS = ARRAY_SIZE(applets);
-#endif
 const struct bb_applet *current_applet;
-const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
+const char *applet_name;
 #if !BB_MMU
 bool re_execed;
 #endif
@@ -419,82 +396,6 @@ static void check_suid(const struct bb_applet *applet)
 #endif /* FEATURE_SUID */
 
 
-#if ENABLE_FEATURE_COMPRESS_USAGE
-
-#include "usage_compressed.h"
-#include "unarchive.h"
-
-static const char *unpack_usage_messages(void)
-{
-        char *outbuf = NULL;
-        bunzip_data *bd;
-        int i;
-
-        i = start_bunzip(&bd,
-                        /* src_fd: */ -1,
-                        /* inbuf:  */ packed_usage,
-                        /* len:    */ sizeof(packed_usage));
-        /* read_bunzip can longjmp to start_bunzip, and ultimately
-         * end up here with i != 0 on read data errors! Not trivial */
-        if (!i) {
-                /* Cannot use xmalloc: will leak bd in NOFORK case! */
-                outbuf = malloc_or_warn(SIZEOF_usage_messages);
-                if (outbuf)
-                        read_bunzip(bd, outbuf, SIZEOF_usage_messages);
-        }
-        dealloc_bunzip(bd);
-        return outbuf;
-}
-#define dealloc_usage_messages(s) free(s)
-
-#else
-
-#define unpack_usage_messages() usage_messages
-#define dealloc_usage_messages(s) ((void)(s))
-
-#endif /* FEATURE_COMPRESS_USAGE */
-
-
-void bb_show_usage(void)
-{
-        if (ENABLE_SHOW_USAGE) {
-                const char *format_string;
-                const char *p;
-                const char *usage_string = p = unpack_usage_messages();
-                int i;
-
-                i = current_applet - applets;
-                while (i) {
-                        while (*p++) continue;
-                        i--;
-                }
-
-                fprintf(stderr, "%s multi-call binary\n", bb_banner);
-                format_string = "\nUsage: %s %s\n\n";
-                if (*p == '\b')
-                        format_string = "\nNo help available.\n\n";
-                fprintf(stderr, format_string, applet_name, p);
-                dealloc_usage_messages((char*)usage_string);
-        }
-        xfunc_die();
-}
-
-
-static int applet_name_compare(const void *name, const void *vapplet)
-{
-        const struct bb_applet *applet = vapplet;
-
-        return strcmp(name, applet->name);
-}
-
-const struct bb_applet *find_applet_by_name(const char *name)
-{
-        /* Do a binary search to find the applet entry given the name. */
-        return bsearch(name, applets, ARRAY_SIZE(applets)-1, sizeof(applets[0]),
-                                applet_name_compare);
-}
-
-
 #if ENABLE_FEATURE_INSTALLER
 /* create (sym)links for each applet */
 static void install_links(const char *busybox, int use_symbolic_links)
@@ -635,16 +536,9 @@ void run_applet_and_exit(const char *name, char **argv)
 }
 
 
-#ifdef __GLIBC__
-/* Make it reside in R/W memory: */
-int *const bb_errno __attribute__ ((section (".data")));
-#endif
-
 int main(int argc, char **argv)
 {
-#ifdef __GLIBC__
-        (*(int **)&bb_errno) = __errno_location();
-#endif
+        bbox_prepare_main();
 
 #if !BB_MMU
         /* NOMMU re-exec trick sets high-order bit in first byte of name */
@@ -660,10 +554,6 @@ int main(int argc, char **argv)
 
         parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
 
-        /* Set locale for everybody except 'init' */
-        if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
-                setlocale(LC_ALL, "");
-
         run_applet_and_exit(applet_name, argv);
         bb_error_msg_and_die("applet not found");
 }
diff --git a/include/busybox.h b/include/busybox.h
index 8b3647f57..3ab90d5c7 100644
--- a/include/busybox.h
+++ b/include/busybox.h
@@ -48,8 +48,9 @@ struct bb_applet {
 #endif
 };
 
-/* Defined in applet.c */
+/* Defined in appletlib.c */
 extern const struct bb_applet applets[];
 extern const unsigned short NUM_APPLETS;
+void bbox_prepare_main(void);
 
 #endif  /* _BB_INTERNAL_H_ */
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 55b3658b4..c6c33bd6b 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -6,6 +6,7 @@
 
 lib-y:=
 
+lib-y += appletlib.o
 lib-y += ask_confirmation.o
 lib-y += bb_askpass.o
 lib-y += bb_basename.o
diff --git a/scripts/trylink b/scripts/trylink
index a87d67225..e756461c8 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -128,6 +128,7 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then
         exit 1
     }
     strip -s --remove-section=.note --remove-section=.comment $EXE -o "$sharedlib_dir/libbusybox.so.$BB_VER"
+    chmod a+x "$sharedlib_dir/libbusybox.so.$BB_VER"
     echo "libbusybox: $sharedlib_dir/libbusybox.so.$BB_VER"
 fi
 
@@ -160,41 +161,15 @@ if test "$CONFIG_FEATURE_INDIVIDUAL" = y; then
         test x"$cname" = "x[[" && cname=test
 
         echo "\
-#include <errno.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include \"../include/autoconf.h\"
-#include \"../include/usage.h\"
-
-#ifdef __GLIBC__
-/* Make it reside in R/W memory: */
-int *const bb_errno __attribute__ ((section (\".data\")));
-#endif
+void bbox_prepare_main(void);
+int $main(int argc, char **argv);
 
 const char *applet_name = \"$name\";
 
-void bb_show_usage(void)
-{
-        fprintf(stderr, \"Usage: $name \"
-#ifdef ${cname}_trivial_usage
-                ${cname}_trivial_usage
-#endif
-#ifdef ${cname}_full_usage
-                \"\\n\\n\" ${cname}_full_usage
-#endif
-                \"\\n\\n\");
-        exit(1);
-}
-
-int $main(int argc, char **argv);
-
 int main(int argc, char **argv)
 {
-#ifdef __GLIBC__
-        (*(int **)&bb_errno) = __errno_location();
-#endif
-        return $main(argc, argv);
+        bbox_prepare_main();
+        return $main(argc, argv);
 }
 " >"$sharedlib_dir/applet.c"
 
@@ -215,3 +190,7 @@ int main(int argc, char **argv)
 
     done <applet.lst
 fi
+
+# libbusybox.so is needed only for -lbusybox at link time,
+# it is not needed at runtime. Deleting to reduce confusion.
+rm "$sharedlib_dir"/libbusybox.so >/dev/null