ar71xx: fix wndr3700_board_detect for some NETGEAR WNDR3700v2

patches/openwrt/0015-ar71xx-fix-wndr3700_board_detect-for-some-NETGEAR-WNDR3700v2.patch

@@ -0,0 +1,26 @@
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 23 Jul 2015 01:31:05 +0200
+Subject: ar71xx: fix wndr3700_board_detect for some NETGEAR WNDR3700v2
+
+There are a few NETGEAR devices which don't terminate the model name in the
+ART with a NUL byte, at least some NETGEAR WNDR3700v2. The current awk
+expression doesn't match 0xFF bytes, so AR71XX_MODEL contains lots of
+trailing 0xFF garbage in this case.
+
+Fix this by matching for the first non-printable character and explicitly
+setting LC_CTYPE=C (probably not strictly necessary on OpenWrt, but will
+definitely work like this, even when awk supports locales and LANG is set).
+
+diff --git a/target/linux/ar71xx/base-files/lib/ar71xx.sh b/target/linux/ar71xx/base-files/lib/ar71xx.sh
+index 8f4bb40..392f498 100755
+--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
++++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
+@@ -38,7 +38,7 @@ wndr3700_board_detect() {
+ 		;;
+ 	"33373031")
+ 		# Use awk to remove everything after the first zero byte
+-		model="$(ar71xx_get_mtd_offset_size_format art 41 32 %c | awk 'BEGIN{FS="[[:cntrl:]]"} {print $1; exit}')"
++		model="$(ar71xx_get_mtd_offset_size_format art 41 32 %c | LC_CTYPE=C awk -v 'FS=[^[:print:]]' '{print $1; exit}')"
+ 		case $model in
+ 		$'\xff'*)
+ 			if [ "${model:24:1}" = 'N' ]; then