bzcat: fix unpacking of more than one file, and unpacking of zero-size bz2. Closes 4393

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 41 insertions, 55 deletions

diff --git a/archival/bbunzip.c b/archival/bbunzip.c
index 9c1a73780..853c653c0 100644
--- a/archival/bbunzip.c
+++ b/archival/bbunzip.c
@@ -103,7 +103,9 @@ int FAST_FUNC bbunpack(char **argv,
                 status = unpacker(&info);
                 if (status < 0)
                         exitcode = 1;
-                xclose(STDOUT_FILENO); /* with error check! */
+
+                if (!(option_mask32 & OPT_STDOUT))
+                        xclose(STDOUT_FILENO); /* with error check! */
 
                 if (filename) {
                         char *del = new_name;
@@ -143,6 +145,9 @@ int FAST_FUNC bbunpack(char **argv,
                 }
         } while (*argv && *++argv);
 
+        if (option_mask32 & OPT_STDOUT)
+                xclose(STDOUT_FILENO); /* with error check! */
+
         return exitcode;
 }
 
diff --git a/archival/libarchive/decompress_bunzip2.c b/archival/libarchive/decompress_bunzip2.c
index cd3144743..c4640d489 100644
--- a/archival/libarchive/decompress_bunzip2.c
+++ b/archival/libarchive/decompress_bunzip2.c
@@ -752,7 +752,14 @@ unpack_bz2_stream(int src_fd, int dst_fd)
                         }
                 }
 
-                if (i != RETVAL_LAST_BLOCK) {
+                if (i != RETVAL_LAST_BLOCK
+                /* Observed case when i == RETVAL_OK:
+                 * "bzcat z.bz2", where "z.bz2" is a bzipped zero-length file
+                 * (to be exact, z.bz2 is exactly these 14 bytes:
+                 * 42 5a 68 39 17 72 45 38  50 90 00 00 00 00).
+                 */
+                 && i != RETVAL_OK
+                ) {
                         bb_error_msg("bunzip error %d", i);
                         break;
                 }
diff --git a/testsuite/bzcat.tests b/testsuite/bzcat.tests
index 5b4f3f4b3..c1d384464 100755
--- a/testsuite/bzcat.tests
+++ b/testsuite/bzcat.tests
@@ -1,54 +1,28 @@
 #!/bin/sh
-
-FAILCOUNT=0
-
-ext=bz2
-
-bb="busybox "
-
-unset LC_ALL
-unset LC_MESSAGES
-unset LANG
-unset LANGUAGE
-
-hello_gz() {
-    # Gzipped "HELLO\n"
-    #_________________________ vvv vvv vvv vvv - mtime
-    $ECHO -ne "\x1f\x8b\x08\x00\x85\x1d\xef\x45\x02\x03\xf3\x70\xf5\xf1\xf1\xe7"
-    $ECHO -ne "\x02\x00\x6e\xd7\xac\xfd\x06\x00\x00\x00"
-}
-
-hello_bz2() {
-    # Bzipped "HELLO\n"
-    $ECHO -ne "\x42\x5a\x68\x39\x31\x41\x59\x26\x53\x59\x5b\xb8\xe8\xa3\x00\x00"
-    $ECHO -ne "\x01\x44\x00\x00\x10\x02\x44\xa0\x00\x30\xcd\x00\xc3\x46\x29\x97"
-    $ECHO -ne "\x17\x72\x45\x38\x50\x90\x5b\xb8\xe8\xa3"
-}
-
-prep() {
-    rm -f t*
-    hello_$ext >t1.$ext
-    hello_$ext >t2.$ext
-}
-
-check() {
-    eval $2 >t_actual 2>&1
-    if $ECHO -ne "$expected" | cmp - t_actual; then
-        echo "PASS: $1"
-    else
-        echo "FAIL: $1"
-        FAILCOUNT=$((FAILCOUNT + 1))
-    fi
-}
-
-mkdir testdir 2>/dev/null
-(
-cd testdir || { echo "cannot cd testdir!"; exit 1; }
-
-expected="HELLO\nok\n"
-prep; check "bzcat: dont delete src" "${bb}bzcat t2.bz2; test -f t2.bz2 && echo ok"
-
-)
-rm -rf testdir
-
-exit $((FAILCOUNT <= 255 ? FAILCOUNT : 255))
+# Copyright 2011 by Denys Vlasenko
+# Licensed under GPLv2, see file LICENSE in this source tree.
+
+. ./testing.sh
+
+# testing "test name" "command" "expected result" "file input" "stdin"
+
+# "input" file is bzipped file with "a\n" data
+testing "bzcat can print many files" \
+"$ECHO -ne '$hexdump' | bzcat input input; echo \$?" \
+"\
+a
+a
+0
+" "\
+\x42\x5a\x68\x39\x31\x41\x59\x26\x53\x59\x63\x3e\xd6\xe2\x00\x00\
+\x00\xc1\x00\x00\x10\x20\x00\x20\x00\x21\x00\x82\xb1\x77\x24\x53\
+\x85\x09\x06\x33\xed\x6e\x20\
+" ""
+
+# "input" file is bzipped zero byte file
+testing "bzcat can handle compressed zero-length bzip2 files" \
+"$ECHO -ne '$hexdump' | bzcat input input; echo \$?" \
+"0\n" \
+"\x42\x5a\x68\x39\x17\x72\x45\x38\x50\x90\x00\x00\x00\x00" ""
+
+exit $FAILCOUNT
diff --git a/testsuite/ls.mk_uni_tests b/testsuite/ls.mk_uni_tests
index da0c29f29..da0c29f29 100644..100755
--- a/testsuite/ls.mk_uni_tests
+++ b/testsuite/ls.mk_uni_tests