X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fmisc.c;h=343d5f9ffdf3bf9e84b51c2295e4e92562ba2e6a;hb=f7077dd38b018f19d3a5c7df6accc6b07b8a2356;hp=1b78b69ea199cdc09e29a1c769eef595a4165594;hpb=20dcc4d1226a4c170b56c1f2472a66bc67fd1f1d;p=chaz%2Ftar

diff --git a/src/misc.c b/src/misc.c
index 1b78b69..343d5f9 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -229,11 +229,12 @@ zap_slashes (char *name)
 }
 
 /* Normalize FILE_NAME by removing redundant slashes and "."
-   components, including redundant trailing slashes.  Leave ".."
-   alone, as it may be significant in the presence of symlinks and on
-   platforms where "/.." != "/".  Destructive version: modifies its
-   argument. */
-static void
+   components, including redundant trailing slashes.
+   Leave ".." alone, as it may be significant in the presence 
+   of symlinks and on platforms where "/.." != "/".
+
+   Destructive version: modifies its argument. */
+void
 normalize_filename_x (char *file_name)
 {
   char *name = file_name + FILE_SYSTEM_PREFIX_LEN (file_name);
@@ -267,8 +268,9 @@ normalize_filename_x (char *file_name)
 }
 
 /* Normalize NAME by removing redundant slashes and "." components,
-   including redundant trailing slashes.  Return a normalized
-   newly-allocated copy.  */
+   including redundant trailing slashes.
+
+   Return a normalized newly-allocated copy.  */
 
 char *
 normalize_filename (const char *name)
@@ -283,21 +285,20 @@ normalize_filename (const char *name)
          getcwd is slow, it might fail, and it does not necessarily
          return a canonical name even when it succeeds.  Perhaps we
          can use dev+ino pairs instead of names?  */
-      copy = xgetcwd ();
-      if (copy)
-        {
-          size_t copylen = strlen (copy);
-          bool need_separator = ! (DOUBLE_SLASH_IS_DISTINCT_ROOT
-                                   && copylen == 2 && ISSLASH (copy[1]));
-          copy = xrealloc (copy, copylen + need_separator + strlen (name) + 1);
-          copy[copylen] = DIRECTORY_SEPARATOR;
-          strcpy (copy + copylen + need_separator, name);
-        }
-      else
-        WARN ((0, errno, _("Cannot get working directory")));
+      const char *cwd = tar_getcwd ();
+      size_t copylen;
+      bool need_separator;
+      
+      copylen = strlen (cwd);
+      need_separator = ! (DOUBLE_SLASH_IS_DISTINCT_ROOT
+			  && copylen == 2 && ISSLASH (cwd[1]));
+      copy = xmalloc (copylen + need_separator + strlen (name) + 1);
+      strcpy (copy, cwd);
+      copy[copylen] = DIRECTORY_SEPARATOR;
+      strcpy (copy + copylen + need_separator, name);
     }
 
-  if (! copy)
+  if (!copy)
     copy = xstrdup (name);
   normalize_filename_x (copy);
   return copy;
@@ -631,7 +632,7 @@ remove_any_file (const char *file_name, enum remove_option option)
 
 	case RECURSIVE_REMOVE_OPTION:
 	  {
-	    char *directory = savedir (file_name);
+	    char *directory = tar_savedir (file_name, 0);
 	    char const *entry;
 	    size_t entrylen;
 
@@ -831,7 +832,8 @@ struct wd
 {
   /* The directory's name.  */
   char const *name;
-
+  /* Current working directory; initialized by tar_getcwd */
+  char *cwd; 
   /* If nonzero, the file descriptor of the directory, or AT_FDCWD if
      the working directory.  If zero, the directory needs to be opened
      to be used.  */
@@ -886,6 +888,7 @@ chdir_arg (char const *dir)
       if (! wd_count)
 	{
 	  wd[wd_count].name = ".";
+	  wd[wd_count].cwd = NULL;
 	  wd[wd_count].fd = AT_FDCWD;
 	  wd_count++;
 	}
@@ -903,6 +906,7 @@ chdir_arg (char const *dir)
     }
 
   wd[wd_count].name = dir;
+  wd[wd_count].cwd = NULL;
   wd[wd_count].fd = 0;
   return wd_count++;
 }
@@ -976,6 +980,46 @@ chdir_do (int i)
     }
 }
 
+const char *
+tar_dirname (void)
+{
+  return wd[chdir_current].name;
+}
+
+const char *
+tar_getcwd (void)
+{
+  static char *cwd;
+  namebuf_t nbuf;
+  int i;
+
+  if (!cwd)
+    cwd = xgetcwd ();
+  if (!wd)
+    return cwd;
+  
+  if (0 == chdir_current || !wd[chdir_current].cwd)
+    {
+      if (IS_ABSOLUTE_FILE_NAME (wd[chdir_current].name))
+	{
+	  wd[chdir_current].cwd = xstrdup (wd[chdir_current].name);
+	  return wd[chdir_current].cwd;
+	}
+      if (!wd[0].cwd)
+	wd[0].cwd = cwd;
+
+      for (i = chdir_current - 1; i > 0; i--)
+	if (wd[i].cwd)
+	  break;
+      
+      nbuf = namebuf_create (wd[i].cwd);
+      for (i++; i <= chdir_current; i++)
+	namebuf_add_dir (nbuf, wd[i].name);
+      wd[chdir_current].cwd = namebuf_finish (nbuf);
+    }
+  return wd[chdir_current].cwd;
+}
+
 void
 close_diag (char const *name)
 {
@@ -1144,3 +1188,55 @@ namebuf_name (namebuf_t buf, const char *name)
   strcpy (buf->buffer + buf->dir_length, name);
   return buf->buffer;
 }
+
+void
+namebuf_add_dir (namebuf_t buf, const char *name)
+{
+  static char dirsep[] = { DIRECTORY_SEPARATOR, 0 };
+  if (!ISSLASH (buf->buffer[buf->dir_length - 1]))
+    {
+      namebuf_name (buf, dirsep);
+      buf->dir_length++;
+    }
+  namebuf_name (buf, name);
+  buf->dir_length += strlen (name);
+}
+
+char *
+namebuf_finish (namebuf_t buf)
+{
+  char *res = buf->buffer;
+  
+  if (ISSLASH (buf->buffer[buf->dir_length - 1]))
+    buf->buffer[buf->dir_length] = 0;
+  free (buf);
+  return res;
+}
+
+/* Return the filenames in directory NAME, relative to the chdir_fd.
+   If the directory does not exist, report error if MUST_EXIST is
+   true.
+
+   Return NULL on errors.
+*/
+char *
+tar_savedir (const char *name, int must_exist)
+{
+  char *ret = NULL;
+  DIR *dir = NULL;
+  int fd = openat (chdir_fd, name, open_read_flags | O_DIRECTORY);
+  if (fd < 0)
+    {
+      if (!must_exist && errno == ENOENT)
+	return NULL;
+      open_error (name);
+    }
+  else if (! ((dir = fdopendir (fd))
+	      && (ret = streamsavedir (dir))))
+    savedir_error (name);
+
+  if (dir ? closedir (dir) != 0 : 0 <= fd && close (fd) != 0)
+    savedir_error (name);
+
+  return ret;
+}