From 9590e781c0ed2ea8a792327fc17d6bb122a92b04 Mon Sep 17 00:00:00 2001
From: Sergey Poznyakoff <gray@gnu.org.ua>
Date: Sat, 26 Nov 2005 19:31:02 +0000
Subject: [PATCH] (xheader_format_name): Fix memory leak.

---
 src/xheader.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 69 insertions(+), 2 deletions(-)

diff --git a/src/xheader.c b/src/xheader.c
index 8f727a9..d880bd5 100644
--- a/src/xheader.c
+++ b/src/xheader.c
@@ -235,6 +235,7 @@ xheader_format_name (struct tar_stat_info *st, const char *fmt, size_t n)
   size_t len = strlen (fmt);
   char *q;
   const char *p;
+  char *dirp = NULL;
   char *dir = NULL;
   char *base = NULL;
   char pidbuf[UINTMAX_STRSIZE_BOUND];
@@ -253,8 +254,9 @@ xheader_format_name (struct tar_stat_info *st, const char *fmt, size_t n)
 	case 'd':
 	  if (st)
 	    {
-	      dir = safer_name_suffix (dir_name (st->orig_file_name),
-	                               false, absolute_names_option);
+	      if (!dirp)
+		dirp = dir_name (st->orig_file_name);
+	      dir = safer_name_suffix (dirp, false, absolute_names_option);
 	      len += strlen (dir) - 2;
 	    }
 	  break;
@@ -328,6 +330,8 @@ xheader_format_name (struct tar_stat_info *st, const char *fmt, size_t n)
 	*q++ = *p++;
     }
 
+  free (dirp);
+  
   /* Do not allow it to end in a slash */
   while (q > buf && ISSLASH (q[-1]))
     q--;
@@ -370,6 +374,17 @@ xheader_write (char type, char *name, struct xheader *xhdr)
   size_t size;
   char *p;
 
+  if (multi_volume_option)
+    {
+      /* Estimate the total size of the extended header and, in case
+	 if XHDTYPE, the ustar header following it, and make sure that
+	 these fit into the current volume */
+      size_t hblocks = 1 + (extended_header.size + BLOCKSIZE - 1) / BLOCKSIZE;
+      if (type == XHDTYPE)
+	hblocks++;
+      multi_volume_fixup (hblocks);
+    }
+  
   size = xhdr->size;
   header = start_private_header (name, size);
   header->header.typeflag = type;
@@ -400,6 +415,44 @@ xheader_write (char type, char *name, struct xheader *xhdr)
     global_header_count++;
 }
 
+/* SIZE is guaranteed to be divisible by BLOCKSIZE */
+void
+xheader_eof (size_t size)
+{
+  union block *header;
+  char *name;
+  int first_block = 1;
+  int nl = 0;
+  
+  size -= BLOCKSIZE;
+  name = xheader_ghdr_name ();
+  header = start_private_header (name, size);
+  header->header.typeflag = XGLTYPE;
+  free (name);
+  simple_finish_header (header);
+  if (size)
+    nl = 1;
+  while (size > 0)
+    {
+      size_t len;
+
+      header = find_next_block ();
+      len = BLOCKSIZE;
+      if (len > size)
+	len = size;
+      memset (header->buffer, 0, len);
+      if (first_block)
+	{
+	  first_block = 0;
+	  sprintf (header->buffer, "%d GNU.volume.eof=", size);
+	}
+      size -= len;
+      set_next_block_after (header);
+    }
+  if (nl)
+    header->buffer[BLOCKSIZE-1] = '\n';
+}
+
 void
 xheader_write_global (void)
 {
@@ -615,6 +668,20 @@ extended_header_init (void)
     }
 }
 
+void
+xheader_save (struct xheader *xhdr)
+{
+  *xhdr = extended_header;
+  memset (&extended_header, 0, sizeof extended_header);
+}
+
+void
+xheader_restore (struct xheader *xhdr)
+{
+  xheader_destroy (&extended_header);
+  extended_header = *xhdr;
+}
+
 void
 xheader_store (char const *keyword, struct tar_stat_info const *st,
 	       void const *data)
-- 
2.44.0