MFC r310367:

pax(1):	Fix a bug with archives smaller than 512 bytes.

The problem here is that the archive is too short (< 512 bytes). The
buffer routines, try to read at least 512 bytes, even when we try to
determine what format file we have, which is wrong.

Obtained from:	NetBSD (CVS rev 1.26)

1 files changed, 4 insertions, 1 deletions

diff --git a/bin/pax/buf_subs.c b/bin/pax/buf_subs.c
index 4922fc8..40affa5 100644
--- a/bin/pax/buf_subs.c
+++ b/bin/pax/buf_subs.c
@@ -852,10 +852,13 @@ buf_fill(void)
 
 		/*
 		 * errors require resync, EOF goes to next archive
+		 * but in case we have not determined yet the format,
+		 * this means that we have a very short file, so we
+		 * are done again.
 		 */
 		if (cnt < 0)
 			break;
-		if (ar_next() < 0) {
+		if (frmt == NULL || ar_next() < 0) {
 			fini = 1;
 			return(0);
 		}