From b4e4bdcda9484d6a65213b79d6b30520d2c44338 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@musicpd.org>
Date: Wed, 29 Mar 2017 20:29:02 +0200
Subject: [PATCH] lib/alsa/Version: wrapper for snd_asoundlib_version()
---
Makefile.am | 1 +
src/lib/alsa/Version.cxx | 52 ++++++++++++++++++++++++++++++++++++++++
src/lib/alsa/Version.hxx | 42 ++++++++++++++++++++++++++++++++
3 files changed, 95 insertions(+)
create mode 100644 src/lib/alsa/Version.cxx
create mode 100644 src/lib/alsa/Version.hxx
diff --git a/Makefile.am b/Makefile.am
index 5a1e7738d..f150b9375 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -257,6 +257,7 @@ UPNP_SOURCES = \
src/lib/upnp/Action.hxx
ALSA_SOURCES = \
+ src/lib/alsa/Version.cxx src/lib/alsa/Version.hxx \
src/lib/alsa/NonBlock.cxx src/lib/alsa/NonBlock.hxx
#
diff --git a/src/lib/alsa/Version.cxx b/src/lib/alsa/Version.cxx
new file mode 100644
index 000000000..b24ded778
--- /dev/null
+++ b/src/lib/alsa/Version.cxx
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "Version.hxx"
+
+#include <alsa/asoundlib.h>
+
+gcc_pure
+static uint_least32_t
+ParseAlsaVersion(const char *p)
+{
+ char *endptr;
+ unsigned long major, minor = 0, subminor = 0;
+
+ major = strtoul(p, &endptr, 10);
+ if (*endptr == '.') {
+ p = endptr + 1;
+ minor = strtoul(p, &endptr, 10);
+ if (*endptr == '.') {
+ p = endptr + 1;
+ subminor = strtoul(p, nullptr, 10);
+ }
+ }
+
+ return MakeAlsaVersion(major, minor, subminor);
+}
+
+uint_least32_t
+GetRuntimeAlsaVersion()
+{
+ const char *version = snd_asoundlib_version();
+ if (version == nullptr)
+ return 0;
+
+ return ParseAlsaVersion(version);
+}
diff --git a/src/lib/alsa/Version.hxx b/src/lib/alsa/Version.hxx
new file mode 100644
index 000000000..4a595ca28
--- /dev/null
+++ b/src/lib/alsa/Version.hxx
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_ALSA_VERSION_HXX
+#define MPD_ALSA_VERSION_HXX
+
+#include "Compiler.h"
+
+#include <stdint.h>
+
+static constexpr uint_least32_t
+MakeAlsaVersion(uint_least32_t major, uint_least32_t minor,
+ uint_least32_t subminor)
+{
+ return (major << 16) | (minor << 8) | subminor;
+}
+
+/**
+ * Wrapper for snd_asoundlib_version() which translates the resulting
+ * string to an integer constructed with MakeAlsaVersion().
+ */
+gcc_const
+uint_least32_t
+GetRuntimeAlsaVersion();
+
+#endif