bug#18750: --line-buffered option doesn't work with --files-with-matches

[Norihiro Tanaka]

If remove fflush() as the previous patch, unexpected result will be
caused in grep -Z.  I fixed it.

From c3ec282f95b5b1f0efe18fe7030c4a9c7486db00 Mon Sep 17 00:00:00 2001
From: Norihiro Tanaka <nori...@kcn.ne.jp>
Date: Fri, 17 Oct 2014 21:52:29 +0900
Subject: [PATCH] grep: line buffered for output of file names in grep
 --line-buffered

Now grep --line-buffered sets not only matched lines but file names to
line buffered.

* src/grep.c (static bool line_buffered): Remove var.
(prline): Remove it.
(main): Remove it, and use setbuf().
---
 src/grep.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/grep.c b/src/grep.c
index a0f2620..64a5fa5 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -835,7 +835,6 @@ static int list_files;              /* List matching files. 
 */
 static bool no_filenames;      /* Suppress file names.  */
 static intmax_t max_count;     /* Stop after outputting this many
                                    lines from an input file.  */
-static bool line_buffered;     /* Use line buffering.  */
 static char *label = NULL;      /* Fake filename for stdin */
 
 
@@ -2408,7 +2407,7 @@ main (int argc, char **argv)
         break;
 
       case LINE_BUFFERED_OPTION:
-        line_buffered = true;
+        setvbuf (stdout, NULL, _IOLBF, 0);
         break;
 
       case LABEL_OPTION:
-- 
2.1.1