From 0868a7d0bd4402321cf683f6acecc264fd8f8040 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Wed, 15 Jan 1997 04:35:01 +0000
Subject: [PATCH] Add struct dir_list and is_ancestor.

---
 src/copy.c | 44 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/src/copy.c b/src/copy.c
index b984df4..529bc71 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -98,12 +98,31 @@ struct flag
   int (*xstat) ();
 };
 
+struct dir_list
+{
+  struct dir_list *parent;
+  ino_t ino;
+  dev_t dev;
+};
+
 int full_write ();
 int euidaccess ();
 
 /* The invocation name of this program.  */
 extern char *program_name;
 
+static int
+is_ancestor (const struct stat *sb, const struct dir_list *ancestors)
+{
+  while (ancestors != 0)
+    {
+      if (ancestors->ino == sb->st_ino && ancestors->dev == sb->st_dev)
+	return 1;
+      ancestors = ancestors->parent;
+    }
+  return 0;
+}
+
 /* Read the contents of the directory SRC_PATH_IN, and recursively
    copy the contents to DST_PATH_IN.  NEW_DST is nonzero if
    DST_PATH_IN is a directory that was created previously in the
@@ -113,7 +132,7 @@ extern char *program_name;
 static int
 copy_dir (const char *src_path_in, const char *dst_path_in, int new_dst,
 	  const struct stat *src_sb, struct dir_list *ancestors,
-	  struct flag *x)
+	  const struct flag *x)
 {
   char *name_space;
   char *namep;
@@ -349,9 +368,10 @@ ret2:
    devices and inodes of parent directories of SRC_PATH.
    Return 0 if successful, 1 if an error occurs. */
 
-int
-copy (const char *src_path, const char *dst_path, int new_dst, dev_t device,
-      struct dir_list *ancestors, struct flag *x)
+static int
+copy_internal (const char *src_path, const char *dst_path,
+	       int new_dst, dev_t device, struct dir_list *ancestors,
+	       const struct flag *x)
 {
   struct stat src_sb;
   struct stat dst_sb;
@@ -765,3 +785,19 @@ un_backup:
     }
   return 1;
 }
+
+/* Copy the file SRC_PATH to the file DST_PATH.  The files may be of
+   any type.  NONEXISTENT_DST should be nonzero if the file DST_PATH is
+   not to exist (e.g., because its parent directory was just created);
+   NONEXISTENT_DST should be zero if DST_PATH might already exist.
+   DEVICE is the device number of the parent directory, or 0 if the
+   parent of this file is not known.  ANCESTORS points to a linked, null
+   terminated list of devices and inodes of parent directories of SRC_PATH.
+   Return 0 if successful, 1 if an error occurs. */
+
+int
+copy (const char *src_path, const char *dst_path, int nonexistent_dst,
+      const struct flag *x)
+{
+  copy_internal (src_path, dst_path, ... , x);
+}
-- 
2.7.4