From 8c35d65c43216bb840326ac7476a180e2ae36fe9 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Fri, 27 Oct 2006 23:42:25 +0000
Subject: recursive_action: add depth param chmod: match coreutils versus
 following links

---
 libbb/recursive_action.c | 40 ++++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 16 deletions(-)

(limited to 'libbb/recursive_action.c')

diff --git a/libbb/recursive_action.c b/libbb/recursive_action.c
index 0d6567dda..ddaf9b896 100644
--- a/libbb/recursive_action.c
+++ b/libbb/recursive_action.c
@@ -11,7 +11,6 @@
 
 #undef DEBUG_RECURS_ACTION
 
-
 /*
  * Walk down all the directories under the specified
  * location, and do something (something specified
@@ -23,16 +22,23 @@
  * is so stinking huge.
  */
 
-static int true_action(const char *fileName, struct stat *statbuf, void* userData)
+static int true_action(const char *fileName, struct stat *statbuf, void* userData, int depth)
 {
 	return TRUE;
 }
 
+/*
+ * followLinks=0/1 differs mainly in handling of links to dirs.
+ * 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
+ * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
+ */
+
 int recursive_action(const char *fileName,
 		int recurse, int followLinks, int depthFirst,
-		int (*fileAction) (const char *fileName, struct stat * statbuf, void* userData),
-		int (*dirAction) (const char *fileName, struct stat * statbuf, void* userData),
-		void* userData)
+		int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
+		int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
+		void* userData,
+		int depth)
 {
 	struct stat statbuf;
 	int status;
@@ -53,21 +59,23 @@ int recursive_action(const char *fileName,
 		return FALSE;
 	}
 
-	if (!followLinks && (S_ISLNK(statbuf.st_mode))) {
-		return fileAction(fileName, &statbuf, userData);
+	/* If S_ISLNK(m), then we know that !S_ISDIR(m).
+	 * Then we can skip checking first part: if it is true, then
+	 * (!dir) is also true! */
+	if ( /* (!followLinks && S_ISLNK(statbuf.st_mode)) || */
+	 !S_ISDIR(statbuf.st_mode)
+	) {
+		return fileAction(fileName, &statbuf, userData, depth);
 	}
 
+	/* It's a directory (or a link to one, and followLinks is set) */
+
 	if (!recurse) {
-		if (S_ISDIR(statbuf.st_mode)) {
-			return dirAction(fileName, &statbuf, userData);
-		}
+		return dirAction(fileName, &statbuf, userData, depth);
 	}
 
-	if (!S_ISDIR(statbuf.st_mode))
-		return fileAction(fileName, &statbuf, userData);
-
 	if (!depthFirst) {
-		status = dirAction(fileName, &statbuf, userData);
+		status = dirAction(fileName, &statbuf, userData, depth);
 		if (!status) {
 			bb_perror_msg("%s", fileName);
 			return FALSE;
@@ -88,14 +96,14 @@ int recursive_action(const char *fileName,
 		if (nextFile == NULL)
 			continue;
 		if (!recursive_action(nextFile, TRUE, followLinks, depthFirst,
-					fileAction, dirAction, userData)) {
+				fileAction, dirAction, userData, depth+1)) {
 			status = FALSE;
 		}
 		free(nextFile);
 	}
 	closedir(dir);
 	if (depthFirst) {
-		if (!dirAction(fileName, &statbuf, userData)) {
+		if (!dirAction(fileName, &statbuf, userData, depth)) {
 			bb_perror_msg("%s", fileName);
 			return FALSE;
 		}
-- 
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