From 7a7b0bd1a4182201a5006c31ab5f1a4ef5849ee6 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Wed, 21 Aug 2013 14:37:10 +0200
Subject: configure: check for strlcpy

---
 configure     | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
 pingu_iface.c |  8 ++++++++
 2 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index b0ea1cb..f78da45 100755
--- a/configure
+++ b/configure
@@ -121,7 +121,52 @@ if $enable_werror; then
 	CFLAGS="$CFLAGS -Werror"
 fi
 
-config_vars="
+cc=${CC:-gcc}
+
+cat > $TMPC << EOF
+#include <string.h>
+int main(void) {
+	char src[4] = "asdf";
+	char dst[4];
+	return strlcpy(dst, src, sizeof(dst));
+}
+EOF
+
+echo -n "Checking for strlcpy: "
+if compile_prog "" ""; then
+	HAVE_STRLCPY=1
+	echo yes
+else
+	echo no
+fi
+
+# generate config.h
+config_h_vars="
+PACKAGE
+HAVE_STRLCPY
+"
+
+cat >config.h <<EOF
+/* this file is generated by $0 */
+#ifndef CONFIG_H
+#define CONFIG_H
+
+EOF
+for var in $config_h_vars; do
+	eval "value=\$$var"
+	case "$value" in
+	[0-9]) echo "#define $var $value" >> config.h;;
+	"") echo "/* $var is unset */" >> config.h;;
+	*) echo "#define $var \"$value\"" >> config.h;;
+	esac
+done
+echo "" >> config.h
+echo '#endif /* CONFIG_H */' >> config.h
+
+CFLAGS="$CFLAGS -DHAVE_CONFIG_H"
+
+# generate config.mk
+config_mk_vars="
 prefix
 exec_prefix
 bindir
@@ -137,7 +182,7 @@ LDFLAGS
 "
 
 echo "# this file is generated by $0" >config.mk
-for var in $config_vars; do
+for var in $config_mk_vars; do
 	eval "value=\$$var"
 	if [ -n "$value" ]; then
 		echo "$var = $value" >> config.mk
diff --git a/pingu_iface.c b/pingu_iface.c
index ec35628..815b1e9 100644
--- a/pingu_iface.c
+++ b/pingu_iface.c
@@ -20,6 +20,14 @@
 #include "pingu_netlink.h"
 #include "sockaddr_util.h"
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef HAVE_STRLCPY
+#define	strlcpy(dst, src, dstsize)	snprintf(dst, dstsize, "%s", src)
+#endif
+
 static struct list_head iface_list = LIST_INITIALIZER(iface_list);
 
 #define PINGU_ROUTE_TABLE_MIN 1
-- 
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