From 67d36f44364dda3d5ac60d4f8bc31df7aeaa23d2 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Thu, 15 Jan 2009 16:08:31 -0800
Subject: [PATCH] New function svec_sort_unique(), svec_is_unique(),
 svec_get_duplicate().

---
 lib/svec.c | 30 +++++++++++++++++++++++++++++-
 lib/svec.h |  5 ++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/lib/svec.c b/lib/svec.c
index f0066392..728866b6 100644
--- a/lib/svec.c
+++ b/lib/svec.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+/* Copyright (c) 2008, 2009 The Board of Trustees of The Leland Stanford
  * Junior University
  *
  * We are making the OpenFlow specification and associated documentation
@@ -121,6 +121,13 @@ svec_sort(struct svec *svec)
     qsort(svec->names, svec->n, sizeof *svec->names, compare_strings);
 }
 
+void
+svec_sort_unique(struct svec *svec)
+{
+    svec_sort(svec);
+    svec_unique(svec);
+}
+
 void
 svec_unique(struct svec *svec)
 {
@@ -213,6 +220,27 @@ svec_is_sorted(const struct svec *svec)
     return true;
 }
 
+bool
+svec_is_unique(const struct svec *svec)
+{
+    return svec_get_duplicate(svec) == NULL;
+}
+
+const char *
+svec_get_duplicate(const struct svec *svec)
+{
+    assert(svec_is_sorted(svec));
+    if (svec->n > 1) {
+        size_t i;
+        for (i = 1; i < svec->n; i++) {
+            if (!strcmp(svec->names[i - 1], svec->names[i])) {
+                return svec->names[i];
+            }
+        }
+    }
+    return NULL;
+}
+
 void
 svec_swap(struct svec *a, struct svec *b)
 {
diff --git a/lib/svec.h b/lib/svec.h
index 2ee275de..084d2e85 100644
--- a/lib/svec.h
+++ b/lib/svec.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+/* Copyright (c) 2008, 2009 The Board of Trustees of The Leland Stanford
  * Junior University
  *
  * We are making the OpenFlow specification and associated documentation
@@ -53,11 +53,14 @@ void svec_add_nocopy(struct svec *, char *);
 void svec_append(struct svec *, const struct svec *);
 void svec_terminate(struct svec *);
 void svec_sort(struct svec *);
+void svec_sort_unique(struct svec *);
 void svec_unique(struct svec *);
 void svec_diff(const struct svec *a, const struct svec *b,
                struct svec *a_only, struct svec *both, struct svec *b_only);
 bool svec_contains(const struct svec *, const char *);
 bool svec_is_sorted(const struct svec *);
+bool svec_is_unique(const struct svec *);
+const char *svec_get_duplicate(const struct svec *);
 void svec_swap(struct svec *a, struct svec *b);
 void svec_print(const struct svec *svec, const char *title);
 void svec_parse_words(struct svec *svec, const char *words);
-- 
2.30.2