Improve STANDALONE_SHELL. "safe" applets are renamed NOEXEC applets

and now this fact is recorded in applets.h, not ash.c.

Several fixes to "--help + STANDALONE_SHELL" scenarios.

function                                             old     new   delta
run_current_applet_and_exit                            -     355    +355
arith                                               2064    2073      +9
refresh                                             1148    1156      +8
getopt32                                            1068    1073      +5
telnet_main                                         1510    1514      +4
md5_sha1_sum_main                                    565     566      +1
xstrtoul_range_sfx                                   255     251      -4
packed_usage                                       22523   22514      -9
tryexec                                              255     203     -52
static.safe_applets                                  152       -    -152
.rodata                                           131320  131128    -192
run_applet_by_name                                   869     506    -363
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 5/5 up/down: 382/-772)         Total: -390 bytes

./busybox ash -c 'i=20000; while test $i != 0; do touch z; i=$((i-1)); done'
runs more than twice as fast with STANDALONE_SHELL versus without.

1 files changed, 4 insertions, 1 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 8f43aeafc..4fc5d183f 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -662,9 +662,11 @@ const struct hwtype *get_hwntype(int type);
 
 
 #ifndef BUILD_INDIVIDUAL
-extern struct BB_applet *find_applet_by_name(const char *name);
+struct BB_applet;
+extern const struct BB_applet *find_applet_by_name(const char *name);
 /* Returns only if applet is not found. */
 extern void run_applet_by_name(const char *name, int argc, char **argv);
+extern void run_current_applet_and_exit(int argc, char **argv) ATTRIBUTE_NORETURN;
 #endif
 
 extern int match_fstype(const struct mntent *mt, const char *fstypes);
@@ -870,6 +872,7 @@ enum {	/* DO NOT CHANGE THESE VALUES!  cp.c, mv.c, install.c depend on them. */
 };
 
 #define FILEUTILS_CP_OPTSTR "pdRfils" USE_SELINUX("c")
+extern const struct BB_applet *current_applet;
 extern const char *applet_name;
 extern const char BB_BANNER[];