Fix data loss when acting as filter

This bug was introduced by the recent lseek-related changes.
* src/delete.c (delete_archive_members):
* src/update.c (update_archive):
Copy the member if acting as a filter, rather than lseeking over
it, which is possible if stdin is a regular file.
* src/list.c (skim_file, skim_member):
* src/sparse.c (sparse_skim_file):
New functions, for copying when a filter.
* src/list.c (skip_file): Remove; replaced with skim_file.
All callers changed.
(skip_member): Reimplement in terms of skim_member.
* src/sparse.c (sparse_skip_file):
Remove; replaced with sparse_skim_file.  All callers changed.
* src/update.c (acting_as_filter): New static var.
(update_archive): Set it; this is like delete.c.
* tests/delete01.at (deleting a member after a big one):
* tests/delete02.at (deleting a member from stdin archive):
Also test filter case.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/extract.c b/src/extract.c
index 7696d5e4..78de47f5 100644
--- a/src/extract.c
+++ b/src/extract.c
@@ -1320,7 +1320,7 @@ extract_file (char *file_name, int typeflag)
 	  }
       }
 
-  skip_file (size);
+  skim_file (size, false);
 
   mv_end ();