sed: fix "sed n (flushes pattern space, terminates early)" testcase failure

Patch based on work by Dengke Du <dengke.du@windriver.com>

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

2 files changed, 11 insertions, 14 deletions

diff --git a/editors/sed.c b/editors/sed.c
index c0d79cc..b7add1f 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -1300,16 +1300,17 @@ static void process_files(void)
 		case 'n':
 			if (!G.be_quiet)
 				sed_puts(pattern_space, last_gets_char);
-			if (next_line) {
-				free(pattern_space);
-				pattern_space = next_line;
-				last_gets_char = next_gets_char;
-				next_line = get_next_line(&next_gets_char, &last_puts_char);
-				substituted = 0;
-				linenum++;
-				break;
+			if (next_line == NULL) {
+				/* If no next line, jump to end of script and exit. */
+				goto discard_line;
 			}
-			/* fall through */
+			free(pattern_space);
+			pattern_space = next_line;
+			last_gets_char = next_gets_char;
+			next_line = get_next_line(&next_gets_char, &last_puts_char);
+			substituted = 0;
+			linenum++;
+			break;
 
 		/* Quit.  End of script, end of input. */
 		case 'q':
diff --git a/testsuite/sed.tests b/testsuite/sed.tests
index a71f8b1..05c00a9 100755
--- a/testsuite/sed.tests
+++ b/testsuite/sed.tests
@@ -73,13 +73,9 @@ testing "sed t (test/branch clears test bit)" "sed -e 's/a/b/;:loop;t loop'" \
 testing "sed T (!test/branch)" "sed -e 's/a/1/;T notone;p;: notone;p'" \
 	"1\n1\n1\nb\nb\nc\nc\n" "" "a\nb\nc\n"
 
-test x"$SKIP_KNOWN_BUGS" = x"" && {
-# Normal sed end-of-script doesn't print "c" because n flushed the pattern
-# space.  If n hits EOF, pattern space is empty when script ends.
-# Query: how does this interact with no newline at EOF?
 testing "sed n (flushes pattern space, terminates early)" "sed -e 'n;p'" \
 	"a\nb\nb\nc\n" "" "a\nb\nc\n"
-}
+
 # non-GNU sed: N does _not_ flush pattern space, therefore c is eaten @ script end
 # GNU sed: N flushes pattern space, therefore c is printed too @ script end
 testing "sed N (flushes pattern space (GNU behavior))" "sed -e 'N;p'" \