[git commit] sysctl: avoid stat() on every item if in -w mode

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=679c30e73eda275085676f51fc77ee18c84edf21
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
sysctl_act_recursive                                 163     167      +4

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 procps/sysctl.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/procps/sysctl.c b/procps/sysctl.c
index 42de374d2..2ef19c1be 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -205,19 +205,21 @@ static int sysctl_act_on_setting(char *setting)
 
 static int sysctl_act_recursive(const char *path)
 {
-	DIR *dirp;
 	struct stat buf;
-	struct dirent *entry;
-	char *next;
 	int retval = 0;
 
-	stat(path, &buf);
-	if (S_ISDIR(buf.st_mode) && !(option_mask32 & FLAG_WRITE)) {
+	if (!(option_mask32 & FLAG_WRITE)
+	 && stat(path, &buf) == 0
+	 && S_ISDIR(buf.st_mode)
+	) {
+		struct dirent *entry;
+		DIR *dirp;
+
 		dirp = opendir(path);
 		if (dirp == NULL)
 			return -1;
 		while ((entry = readdir(dirp)) != NULL) {
-			next = concat_subpath_file(path, entry->d_name);
+			char *next = concat_subpath_file(path, entry->d_name);
 			if (next == NULL)
 				continue; /* d_name is "." or ".." */
 			/* if path was ".", drop "./" prefix: */
@@ -305,6 +307,8 @@ int sysctl_main(int argc UNUSED_PARAM, char **argv)
 		return sysctl_act_recursive(".");
 	}
 
+//TODO: if(!argv[0]) bb_show_usage() ?
+
 	retval = 0;
 	while (*argv) {
 		sysctl_dots_to_slashes(*argv);