Add option -l, to make output line buffered.

PR:		bin/78692
Submitted by:	Eugene Grosbein
MFC after:	2 weeks

2 files changed, 11 insertions, 5 deletions

diff --git a/usr.bin/sed/main.c b/usr.bin/sed/main.c
index 5528514..5703d20 100644
--- a/usr.bin/sed/main.c
+++ b/usr.bin/sed/main.c
@@ -128,7 +128,7 @@ main(int argc, char *argv[])
 	fflag = 0;
 	inplace = NULL;
 
-	while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1)
+	while ((c = getopt(argc, argv, "Eae:f:i:ln")) != -1)
 		switch (c) {
 		case 'E':
 			rflags = REG_EXTENDED;
@@ -151,6 +151,10 @@ main(int argc, char *argv[])
 		case 'i':
 			inplace = optarg;
 			break;
+		case 'l':
+			if(setlinebuf(stdout) != 0)
+				warnx("setlinebuf() failed");
+			break;
 		case 'n':
 			nflag = 1;
 			break;
@@ -186,8 +190,8 @@ static void
 usage(void)
 {
 	(void)fprintf(stderr, "%s\n%s\n",
-		"usage: sed script [-Ean] [-i extension] [file ...]",
-		"       sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
+		"usage: sed script [-Ealn] [-i extension] [file ...]",
+		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
 	exit(1);
 }
 
diff --git a/usr.bin/sed/sed.1 b/usr.bin/sed/sed.1
index a21248f..de78443 100644
--- a/usr.bin/sed/sed.1
+++ b/usr.bin/sed/sed.1
@@ -39,11 +39,11 @@
 .Nd stream editor
 .Sh SYNOPSIS
 .Nm
-.Op Fl Ean
+.Op Fl Ealn
 .Ar command
 .Op Ar
 .Nm
-.Op Fl Ean
+.Op Fl Ealn
 .Op Fl e Ar command
 .Op Fl f Ar command_file
 .Op Fl i Ar extension
@@ -105,6 +105,8 @@ It is not recommended to give a zero-length
 .Ar extension
 when in-place editing files, as you risk corruption or partial content
 in situations where disk space is exhausted, etc.
+.It Fl l
+Make output line buffered.
 .It Fl n
 By default, each line of input is echoed to the standard output after
 all of the commands have been applied to it.