From 21fe945ebd7183685bf5bbcd80bf6b1b946eb841 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 13 Oct 2014 14:59:17 -0400
Subject: [PATCH] Define a strnlen replacement on platforms (win32) that lack
 it

Right now this is only needed for test_util_format_time_interval, so
define it as a static function.  We can move it into compat later if
we need to.
---
 configure.ac         |  1 +
 src/test/test_util.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/configure.ac b/configure.ac
index c0523e1082..4c7da5d76a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -365,6 +365,7 @@ AC_CHECK_FUNCS(
         socketpair \
         strlcat \
         strlcpy \
+	strnlen \
         strptime \
         strtok_r \
         strtoull \
diff --git a/src/test/test_util.c b/src/test/test_util.c
index 8855cafc12..eb169f4dd5 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -2072,6 +2072,17 @@ test_util_sscanf(void *arg)
 #define tt_char_op(a,op,b) tt_assert_op_type(a,op,b,char,"%c")
 #define tt_ci_char_op(a,op,b) tt_char_op(tolower(a),op,tolower(b))
 
+#ifndef HAVE_STRNLEN
+static size_t
+strnlen(const char *s, size_t len)
+{
+  const char *p = memchr(s, 0, len);
+  if (!p)
+    return len;
+  return p - s;
+}
+#endif
+
 static void
 test_util_format_time_interval(void *arg)
 {