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>

3 files changed, 14 insertions, 15 deletions

diff --git a/modutils/depmod.c b/modutils/depmod.c
index 318e7cd..bb42bbe 100644
--- a/modutils/depmod.c
+++ b/modutils/depmod.c
@@ -32,10 +32,11 @@
  *   for each depends, look through our list of full paths and emit if found
  */
 
-static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
-				void *data, int depth UNUSED_PARAM)
+static int FAST_FUNC parse_module(struct recursive_state *state,
+		const char *fname,
+		struct stat *sb UNUSED_PARAM)
 {
-	module_db *modules = data;
+	module_db *modules = state->userData;
 	char *image, *ptr;
 	module_entry *e;
 
@@ -201,11 +202,12 @@ int depmod_main(int argc UNUSED_PARAM, char **argv)
 	memset(&modules, 0, sizeof(modules));
 	if (*argv) {
 		do {
-			parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
+			recursive_action(*argv, 0 /* no ACTION_RECURSE! */,
+				parse_module, NULL, &modules);
 		} while (*++argv);
 	} else {
 		recursive_action(".", ACTION_RECURSE,
-				parse_module, NULL, &modules, 0);
+				parse_module, NULL, &modules);
 	}
 
 	/* Generate dependency and alias files */
diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
index a94b0b9..18cfac4 100644
--- a/modutils/modprobe-small.c
+++ b/modutils/modprobe-small.c
@@ -751,8 +751,7 @@ static int process_module(char *name, const char *cmdline_options)
 			ACTION_RECURSE, /* flags */
 			fileAction, /* file action */
 			NULL, /* dir action */
-			name, /* user data */
-			0 /* depth */
+			name /* user data */
 		);
 		dbg1_error_msg("dirscan complete");
 		/* Module was not found, or load failed, or is_remove */
diff --git a/modutils/modprobe.c b/modutils/modprobe.c
index 70c4590..eeeff76 100644
--- a/modutils/modprobe.c
+++ b/modutils/modprobe.c
@@ -235,10 +235,9 @@ static void add_probe(const char *name)
 	}
 }
 
-static int FAST_FUNC config_file_action(const char *filename,
-					struct stat *statbuf UNUSED_PARAM,
-					void *userdata UNUSED_PARAM,
-					int depth)
+static int FAST_FUNC config_file_action(struct recursive_state *state,
+		const char *filename,
+		struct stat *statbuf UNUSED_PARAM)
 {
 	char *tokens[3];
 	parser_t *p;
@@ -255,7 +254,7 @@ static int FAST_FUNC config_file_action(const char *filename,
 	 * that we shouldn't recurse into /etc/modprobe.d/dir/
 	 * _subdirectories_:
 	 */
-	if (depth > 1)
+	if (state->depth > 1)
 		return SKIP; /* stop recursing */
 //TODO: instead, can use dirAction in recursive_action() to SKIP dirs
 //on depth == 1 level. But that's more code...
@@ -264,7 +263,7 @@ static int FAST_FUNC config_file_action(const char *filename,
 	 * depth==0: read_config("modules.{symbols,alias}") must work,
 	 * "include FILE_NOT_ENDING_IN_CONF" must work too.
 	 */
-	if (depth != 0) {
+	if (state->depth != 0) {
 		if (!is_suffixed_with(base, ".conf"))
 			goto error;
 	}
@@ -329,8 +328,7 @@ static int FAST_FUNC config_file_action(const char *filename,
 static int read_config(const char *path)
 {
 	return recursive_action(path, ACTION_RECURSE | ACTION_QUIET,
-				config_file_action, NULL, NULL,
-				/*depth:*/ 0);
+				config_file_action, NULL, NULL);
 }
 
 static const char *humanly_readable_name(struct module_entry *m)