mixer

commit 4c0451536786ca83488c268aeacb0c1299f1d128
parent 8b62568de30fb40da917397286e55f03037700bd
Author: Christos Margiolis <christos@margiolis.net>
Date:   Sun, 17 Oct 2021 15:17:58 +0300

mixer(8): add -h option

Diffstat:
M
usr.sbin/mixer/mixer.8
 | 
6
+++++-
M
usr.sbin/mixer/mixer.c
 | 
9
+++++----

2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/usr.sbin/mixer/mixer.8 b/usr.sbin/mixer/mixer.8
@@ -22,7 +22,7 @@
 .\" $FreeBSD$
 .\"
 
-.Dd September 22, 2021
+.Dd October 17, 2021
 .Dt mixer 8
 .Os
 .Sh NAME
@@ -39,6 +39,8 @@
 .Op Fl d Ar unit
 .Op Fl os
 .Fl a
+.Nm
+.Fl h
 .Sh DESCRIPTION
 The
 .Nm
@@ -58,6 +60,8 @@ at the number each mixer device has by running
 Open
 .Ar device
 as the mixer device (see FILES).
+.It Fl h
+Print a help message to stderr.
 .It Fl o
 Print mixer values in a format suitable for use inside scripts. The
 mixer's header (name, audio card name, ...) will not be printed.
diff --git a/usr.sbin/mixer/mixer.c b/usr.sbin/mixer/mixer.c
@@ -64,7 +64,7 @@ main(int argc, char *argv[])
 	int aflag = 0, dflag = 0, oflag = 0, sflag = 0;
 	int ch;
 
-	while ((ch = getopt(argc, argv, "ad:f:os")) != -1) {
+	while ((ch = getopt(argc, argv, "ad:f:hos")) != -1) {
 		switch (ch) {
 		case 'a':
 			aflag = 1;
@@ -84,6 +84,7 @@ main(int argc, char *argv[])
 		case 's':
 			sflag = 1;
 			break;
+		case 'h': /* FALLTHROUGH */
 		case '?':
 		default:
 			usage();
@@ -173,9 +174,9 @@ next:
 static void __dead2
 usage(void)
 {
-	printf("usage: %1$s [-f device] [-d unit] [-os] [dev[.control[=value]]] ...\n"
-	    "       %1$s [-d unit] [-os] -a\n",
-	    getprogname());
+	fprintf(stderr, "usage: %1$s [-f device] [-d unit] [-os] [dev[.control[=value]]] ...\n"
+	    "       %1$s [-d unit] [-os] -a\n"
+	    "       %1$s -h\n", getprogname());
 	exit(1);
 }