1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libc/uuid/uuid_compare.c b/lib/libc/uuid/uuid_compare.c
new file mode 100644
index 0000000..8b6d218
--- /dev/null
+++ b/lib/libc/uuid/uuid_compare.c
@@ -0,0 +1,76 @@
+/*-
+ * Copyright (c) 2002 Marcel Moolenaar
+ * Copyright (c) 2002 Hiten Mahesh Pandya
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <string.h>
+#include <uuid.h>
+
+/*
+ * uuid_compare() - compare two UUIDs.
+ * See also:
+ *	http://www.opengroup.org/onlinepubs/009629399/uuid_compare.htm
+ *	http://www.transarc.ibm.com/Library/documentation/dce/1.1/uuid_compare.html
+ *
+ * NOTE: Either UUID can be NULL, meaning a nil UUID. nil UUIDs are smaller
+ *	 than any non-nil UUID.
+ */
+int32_t
+uuid_compare(uuid_t *a, uuid_t *b, uint32_t *status)
+{
+	int res;
+
+	if (status != NULL)
+		*status = uuid_s_ok;
+
+	/* Deal with NULL or equal pointers. */
+	if (a == b)
+		return (0);
+	if (a == NULL)
+		return ((uuid_is_nil(b, NULL)) ? 0 : -1);
+	if (b == NULL)
+		return ((uuid_is_nil(a, NULL)) ? 0 : 1);
+
+	/* We have to compare the hard way. */
+	res = (int)((int64_t)a->time_low - (int64_t)b->time_low);
+	if (res)
+		return ((res < 0) ? -1 : 1);
+	res = (int)a->time_mid - (int)b->time_mid;
+	if (res)
+		return ((res < 0) ? -1 : 1);
+	res = (int)a->time_hi_and_version - (int)b->time_hi_and_version;
+	if (res)
+		return ((res < 0) ? -1 : 1);
+	res = (int)a->clock_seq_hi_and_reserved -
+	    (int)b->clock_seq_hi_and_reserved;
+	if (res)
+		return ((res < 0) ? -1 : 1);
+	res = (int)a->clock_seq_low - (int)b->clock_seq_low;
+	if (res)
+		return ((res < 0) ? -1 : 1);
+	return (memcmp(a->node, b->node, sizeof(uuid_t)));
+}