From f38bac8883ea2e9ed8e2836f97a953efb85e774c Mon Sep 17 00:00:00 2001
From: "Neal H. Walfield" <neal@g10code.com>
Date: Fri, 6 Nov 2015 10:51:35 +0100
Subject: common: Add new function strlist_rev.

* common/strlist.c (strlist_rev): New function.
* common/t-strlist.c: New file.
* common/Makefile.am (common_sources): Add strlist.c and strlist.h.
(module_tests): Add t-strlist.
(t_strlist_LDADD): New variable.

--
Signed-off-by: Neal H. Walfield <neal@g10code.com>
---
 common/strlist.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'common/strlist.c')

diff --git a/common/strlist.c b/common/strlist.c
index 9bd6195f9..760a46040 100644
--- a/common/strlist.c
+++ b/common/strlist.c
@@ -231,3 +231,22 @@ strlist_length (strlist_t list)
 
   return i;
 }
+
+/* Reverse the list *LIST in place.  */
+strlist_t
+strlist_rev (strlist_t *list)
+{
+  strlist_t l = *list;
+  strlist_t lrev = NULL;
+
+  while (l)
+    {
+      strlist_t tail = l->next;
+      l->next = lrev;
+      lrev = l;
+      l = tail;
+    }
+
+  *list = lrev;
+  return lrev;
+}
-- 
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