libbb: shrink recursive_action() by reducing memory pressure

function                                             old     new   delta
recursive_action1                                      -     316    +316
file_action_grep                                     161     164      +3
add_to_prg_cache_if_socket                           202     205      +3
depmod_main                                          509     511      +2
writeFileToTarball                                   488     489      +1
parse_module                                         281     282      +1
fileAction                                           207     208      +1
act                                                  189     190      +1
add_to_dirlist                                        65      64      -1
writeTarFile                                         196     194      -2
uuidcache_init                                        47      45      -2
uuidcache_check_device                               109     107      -2
true_action                                            8       6      -2
run_parts_main                                       310     308      -2
netstat_main                                         534     532      -2
lsusb_main                                            29      27      -2
lspci_main                                            45      43      -2
initial_scan                                         138     136      -2
grep_main                                            845     843      -2
find_main                                            482     480      -2
config_file_action                                   437     435      -2
chmod_main                                           142     140      -2
dirAction                                             14      10      -4
diff_main                                           1544    1540      -4
chown_main                                           154     148      -6
skip_dir                                             136     129      -7
dir_act                                              191     184      -7
recursive_action                                     453      69    -384
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 7/20 up/down: 328/-439)        Total: -111 bytes

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

1 files changed, 12 insertions, 4 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 8b84d13a0..1b7c0b83a 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -441,10 +441,18 @@ enum {
         ACTION_DANGLING_OK    = (1 << 5),
 };
 typedef uint8_t recurse_flags_t;
-extern int recursive_action(const char *fileName, unsigned flags,
-        int FAST_FUNC (*fileAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
-        int FAST_FUNC (*dirAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
-        void* userData, unsigned depth) FAST_FUNC;
+typedef struct recursive_state {
+        unsigned flags;
+        unsigned depth;
+        void *userData;
+        int FAST_FUNC (*fileAction)(struct recursive_state *state, const char *fileName, struct stat* statbuf);
+        int FAST_FUNC  (*dirAction)(struct recursive_state *state, const char *fileName, struct stat* statbuf);
+} recursive_state_t;
+int recursive_action(const char *fileName, unsigned flags,
+        int FAST_FUNC (*fileAction)(struct recursive_state *state, const char *fileName, struct stat* statbuf),
+        int FAST_FUNC  (*dirAction)(struct recursive_state *state, const char *fileName, struct stat* statbuf),
+        void *userData
+) FAST_FUNC;
 
 extern int device_open(const char *device, int mode) FAST_FUNC;
 enum { GETPTY_BUFSIZE = 16 }; /* more than enough for "/dev/ttyXXX" */