Move components into dedicated subdirectory

[slstatus.git] / components / volume.c

diff --git a/components/volume.c b/components/volume.c
new file mode 100644 (file)
index 0000000..f5aa18d
--- /dev/null
+++ b/components/volume.c
@@ -0,0 +1,43 @@
+/* See LICENSE file for copyright and license details. */
+#include <err.h>
+#include <fcntl.h>
+#include <sys/soundcard.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../util.h"
+
+const char *
+vol_perc(const char *card)
+{
+       unsigned int i;
+       int v, afd, devmask;
+       char *vnames[] = SOUND_DEVICE_NAMES;
+
+       afd = open(card, O_RDONLY | O_NONBLOCK);
+       if (afd == -1) {
+               warn("Cannot open %s", card);
+               return NULL;
+       }
+
+       if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
+               warn("Cannot get volume for %s", card);
+               close(afd);
+               return NULL;
+       }
+       for (i = 0; i < LEN(vnames); i++) {
+               if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
+                       if (ioctl(afd, MIXER_READ(i), &v) == -1) {
+                               warn("vol_perc: ioctl");
+                               close(afd);
+                               return NULL;
+                       }
+               }
+       }
+
+       close(afd);
+
+       return bprintf("%d", v & 0xff);
+}