X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fmakepath.c;h=7631c48329f67c69ff7fbbc77b7485ef4ce77b93;hb=1cc4ba44c23782d32d4d2986b355e336f5e21335;hp=460129477b81bb3e210433a2721bb779d1e7ce60;hpb=0bd4ecccc6c6547b998b029445c9d9ba36f5f73a;p=gnulib.git

diff --git a/lib/makepath.c b/lib/makepath.c
index 460129477..7631c4832 100644
--- a/lib/makepath.c
+++ b/lib/makepath.c
@@ -87,7 +87,7 @@ void strip_trailing_slashes ();
     {							\
       /* We're done operating on basename_dir.		\
 	 Restore working directory.  */			\
-      if (saved_cwd)					\
+      if (do_chdir)					\
 	{						\
 	  int fail = restore_cwd (&cwd, NULL, NULL);	\
 	  free_cwd (&cwd);				\
@@ -159,10 +159,9 @@ make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
 	struct ptr_list *next;
       };
       struct ptr_list *p, *leading_dirs = NULL;
-      int saved_cwd = 0;
+      int do_chdir;		/* Whether to chdir before each mkdir.  */
       struct saved_cwd cwd;
       char *basename_dir;
-      int first_subdir = 1;
       char *dirpath;
 
       /* Temporarily relax umask in case it's overly restrictive.  */
@@ -189,6 +188,16 @@ make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
 	  re_protect = 0;
 	}
 
+      /* If we can record the current working directory, we may be able
+	 to do the chdir optimization.  */
+      do_chdir = !save_cwd (&cwd);
+
+      /* If we've saved the cwd and DIRPATH is an absolute pathname,
+	 we must chdir to `/' in order to enable the chdir optimization.
+         So if chdir ("/") fails, turn off the optimization.  */
+      if (do_chdir && *dirpath == '/' && chdir ("/") < 0)
+	do_chdir = 0;
+
       slash = dirpath;
 
       /* Skip over leading slashes.  */
@@ -197,6 +206,8 @@ make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
 
       while (1)
 	{
+	  int newly_created_dir = 1;
+
 	  /* slash points to the leftmost unprocessed component of dirpath.  */
 	  basename_dir = slash;
 
@@ -204,59 +215,62 @@ make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
 	  if (slash == NULL)
 	    break;
 
-	  if (first_subdir)
-	    {
-	      first_subdir = 0;
-	      saved_cwd = !save_cwd (&cwd);
-	    }
-
-	  if (!saved_cwd)
+	  /* If we're *not* doing chdir before each mkdir, then we have to refer
+	     to the target using the full (multi-component) directory name.  */
+	  if (!do_chdir)
 	    basename_dir = dirpath;
 
 	  *slash = '\0';
-	  if (stat (basename_dir, &stats))
+	  if (mkdir (basename_dir, tmp_mode))
 	    {
-	      if (mkdir (basename_dir, tmp_mode))
+	      if (stat (basename_dir, &stats))
 		{
 		  error (0, errno, "cannot create directory `%s'", dirpath);
 		  CLEANUP;
 		  return 1;
 		}
+	      else if (!S_ISDIR (stats.st_mode))
+		{
+		  error (0, 0, "`%s' exists but is not a directory", dirpath);
+		  CLEANUP;
+		  return 1;
+		}
 	      else
 		{
-		  if (verbose_fmt_string != NULL)
-		    error (0, 0, verbose_fmt_string, dirpath);
+		  /* DIRPATH already exists and is a directory. */
+		  newly_created_dir = 0;
+		}
+	    }
+
+	  if (newly_created_dir && verbose_fmt_string != NULL)
+	    fprintf (stderr, verbose_fmt_string, dirpath);
 
-		  if (owner != (uid_t) -1 && group != (gid_t) -1
-		      && chown (basename_dir, owner, group)
+	  if (owner != (uid_t) -1 && group != (gid_t) -1
+	      && chown (basename_dir, owner, group)
 #if defined(AFS) && defined (EPERM)
-		      && errno != EPERM
+	      && errno != EPERM
 #endif
-		      )
-		    {
-		      error (0, errno, "%s", dirpath);
-		      CLEANUP;
-		      return 1;
-		    }
-
-		  if (re_protect)
-		    {
-		      struct ptr_list *new = (struct ptr_list *)
-			alloca (sizeof (struct ptr_list));
-		      new->dirname_end = slash;
-		      new->next = leading_dirs;
-		      leading_dirs = new;
-		    }
-		}
-	    }
-	  else if (!S_ISDIR (stats.st_mode))
+	      )
 	    {
-	      error (0, 0, "`%s' exists but is not a directory", dirpath);
+	      error (0, errno, "%s", dirpath);
 	      CLEANUP;
 	      return 1;
 	    }
 
-	  if (saved_cwd && chdir (basename_dir) < 0)
+	  if (re_protect)
+	    {
+	      struct ptr_list *new = (struct ptr_list *)
+		alloca (sizeof (struct ptr_list));
+	      new->dirname_end = slash;
+	      new->next = leading_dirs;
+	      leading_dirs = new;
+	    }
+
+	  /* If we were able to save the initial working directory,
+	     then we can use chdir to change into each directory before
+	     creating an entry in that directory.  This avoids making
+	     stat and mkdir process O(n^2) file name components.  */
+	  if (do_chdir && chdir (basename_dir) < 0)
 	    {
 	      error (0, errno, "cannot chdir to directory, %s", dirpath);
 	      CLEANUP;
@@ -271,7 +285,7 @@ make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
 	    slash++;
 	}
 
-      if (!saved_cwd)
+      if (!do_chdir)
 	basename_dir = dirpath;
 
       /* We're done making leading directories.