Add native OpenBSD support for mute/volume

Based on functionality in dstat by Joerg Jung.

LICENSE

@@ -18,6 +18,8 @@ Copyright 2018 Tobias Tschinkowitz <tobias@he4d.net>
 Copyright 2018 David Demelier <markand@malikania.fr>
 Copyright 2018-2019 Michael Buch <michaelbuch12@gmail.com>
 Copyright 2018 Ian Remmler <ian@remmler.org>
+Copyright 2016-2019 Joerg Jung <jung@openbsd.org>
+Copyright 2019 Ingo Feinerer <feinerer@logic.at>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted, provided that the above

README

@@ -38,7 +38,7 @@ In order to build slstatus you need the Xlib header files.
 Installation
 ------------
 Edit config.mk to match your local setup (slstatus is installed into the
-/usr/local namespace by default). Uncomment OSSLIBS on OpenBSD.
+/usr/local namespace by default).
 
 Afterwards enter the following command to build and install slstatus (if
 necessary as root):

components/volume.c

@@ -2,19 +2,82 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
-#if defined(__OpenBSD__)
-	#include <soundcard.h>
-#else
-	#include <sys/soundcard.h>
-#endif
 #include <sys/ioctl.h>
 #include <unistd.h>
 
 #include "../util.h"
 
-const char *
-vol_perc(const char *card)
-{
+#if defined(__OpenBSD__)
+	#include <sys/audioio.h>
+
+	const char *
+	vol_perc(const char *card)
+	{
+		static int cls = -1;
+		mixer_devinfo_t mdi;
+		mixer_ctrl_t mc;
+		int afd = -1, m = -1, v = -1;
+
+		if ((afd = open(card, O_RDONLY)) < 0) {
+			warn("open '%s':", card);
+			return NULL;
+		}
+
+		for (mdi.index = 0; cls == -1; mdi.index++) {
+			if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
+				warn("ioctl 'AUDIO_MIXER_DEVINFO':");
+				close(afd);
+				return NULL;
+			}
+			if (mdi.type == AUDIO_MIXER_CLASS &&
+			    !strncmp(mdi.label.name,
+				     AudioCoutputs,
+				     MAX_AUDIO_DEV_LEN))
+				cls = mdi.index;
+			}
+		for (mdi.index = 0; v == -1 || m == -1; mdi.index++) {
+			if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
+				warn("ioctl 'AUDIO_MIXER_DEVINFO':");
+				close(afd);
+				return NULL;
+			}
+			if (mdi.mixer_class == cls &&
+			    ((mdi.type == AUDIO_MIXER_VALUE &&
+			      !strncmp(mdi.label.name,
+				       AudioNmaster,
+				       MAX_AUDIO_DEV_LEN)) ||
+			     (mdi.type == AUDIO_MIXER_ENUM &&
+			      !strncmp(mdi.label.name,
+				      AudioNmute,
+				      MAX_AUDIO_DEV_LEN)))) {
+				mc.dev = mdi.index, mc.type = mdi.type;
+				if (ioctl(afd, AUDIO_MIXER_READ, &mc) < 0) {
+					warn("ioctl 'AUDIO_MIXER_READ':");
+					close(afd);
+					return NULL;
+				}
+				if (mc.type == AUDIO_MIXER_VALUE)
+					v = mc.un.value.num_channels == 1 ?
+					    mc.un.value.level[AUDIO_MIXER_LEVEL_MONO] :
+					    (mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] >
+					     mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT] ?
+					     mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] :
+					     mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
+				else if (mc.type == AUDIO_MIXER_ENUM)
+					m = mc.un.ord;
+			}
+		}
+
+		close(afd);
+
+		return bprintf("%d", m ? 0 : v * 100 / 255);
+	}
+#else
+	#include <sys/soundcard.h>
+
+	const char *
+	vol_perc(const char *card)
+	{
 		size_t i;
 		int v, afd, devmask;
 		char *vnames[] = SOUND_DEVICE_NAMES;
@@ -42,4 +105,5 @@ vol_perc(const char *card)
 		close(afd);
 
 		return bprintf("%d", v & 0xff);
-}
+	}
+#endif

config.mk

@@ -14,7 +14,6 @@ X11LIB = /usr/X11R6/lib
 CPPFLAGS = -I$(X11INC) -D_DEFAULT_SOURCE
 CFLAGS   = -std=c99 -pedantic -Wall -Wextra -Os
 LDFLAGS  = -L$(X11LIB) -s
-# OpenBSD: add -lossaudio
 LDLIBS   = -lX11
 
 # compiler and linker