1 files changed, 154 insertions, 0 deletions
diff --git a/libmount/src/version.c b/libmount/src/version.c
new file mode 100644
index 0000000..b69b09a
--- /dev/null
+++ b/libmount/src/version.c
@@ -0,0 +1,154 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * This file is part of libmount from util-linux project.
+ *
+ * Copyright (C) 2008-2018 Karel Zak <kzak@redhat.com>
+ *
+ * libmount is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * SECTION: version-utils
+ * @title: Version functions
+ * @short_description: functions to get the library version.
+ */
+
+#include <ctype.h>
+
+#include "mountP.h"
+
+static const char *lib_version = LIBMOUNT_VERSION;
+static const char *lib_features[] = {
+#ifdef HAVE_LIBSELINUX
+	"selinux",
+#endif
+#ifdef HAVE_SMACK
+	"smack",
+#endif
+#ifdef HAVE_BTRFS_SUPPORT
+	"btrfs",
+#endif
+#ifdef HAVE_CRYPTSETUP
+	"verity",
+#endif
+#ifdef USE_LIBMOUNT_SUPPORT_MTAB
+	"mtab",
+#endif
+#ifdef USE_LIBMOUNT_SUPPORT_NAMESPACES
+	"namespaces",
+#endif
+#if !defined(NDEBUG)
+	"assert",	/* libc assert.h stuff */
+#endif
+	"debug",	/* always enabled */
+	NULL
+};
+
+/**
+ * mnt_parse_version_string:
+ * @ver_string: version string (e.g "2.18.0")
+ *
+ * Returns: release version code.
+ */
+int mnt_parse_version_string(const char *ver_string)
+{
+	const char *cp;
+	int version = 0;
+
+	assert(ver_string);
+
+	for (cp = ver_string; *cp; cp++) {
+		if (*cp == '.')
+			continue;
+		if (!isdigit(*cp))
+			break;
+		version = (version * 10) + (*cp - '0');
+	}
+	return version;
+}
+
+/**
+ * mnt_get_library_version:
+ * @ver_string: return pointer to the static library version string if not NULL
+ *
+ * Returns: release version number.
+ */
+int mnt_get_library_version(const char **ver_string)
+{
+	if (ver_string)
+		*ver_string = lib_version;
+
+	return mnt_parse_version_string(lib_version);
+}
+
+/**
+ * mnt_get_library_features:
+ * @features: returns a pointer to the static array of strings, the array is
+ *            terminated by NULL.
+ *
+ * Returns: number of items in the features array not including the last NULL,
+ *          or less than zero in case of error
+ *
+ * Example:
+ * <informalexample>
+ *   <programlisting>
+ *	const char **features;
+ *
+ *	mnt_get_library_features(&features);
+ *	while (features && *features)
+ *		printf("%s\n", *features++);
+ *   </programlisting>
+ * </informalexample>
+ *
+ */
+int mnt_get_library_features(const char ***features)
+{
+	if (!features)
+		return -EINVAL;
+
+	*features = lib_features;
+	return ARRAY_SIZE(lib_features) - 1;
+}
+
+#ifdef TEST_PROGRAM
+static int test_version(struct libmnt_test *ts, int argc, char *argv[])
+{
+	const char *ver;
+	const char **features;
+
+	if (argc == 2)
+		printf("Your version: %d\n",
+				mnt_parse_version_string(argv[1]));
+
+	mnt_get_library_version(&ver);
+
+	printf("Library version: %s\n", ver);
+	printf("Library API version: " LIBMOUNT_VERSION "\n");
+	printf("Library features:");
+
+	mnt_get_library_features(&features);
+	while (features && *features)
+		printf(" %s", *features++);
+
+	printf("\n");
+
+	if (mnt_get_library_version(NULL) ==
+			mnt_parse_version_string(LIBMOUNT_VERSION))
+		return 0;
+
+	return -1;
+}
+
+int main(int argc, char *argv[])
+{
+	struct libmnt_test ts[] = {
+		{ "--print", test_version, "print versions" },
+		{ NULL }
+	};
+
+	return mnt_run_test(ts, argc, argv);
+}
+#endif