netdev - [PATCH iproute2 v4 1/5] configure: fix parsing issue on include

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Date:   Thu,  7 Oct 2021 15:40:01 +0200
From:   Andrea Claudi <aclaudi@...hat.com>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com, bluca@...ian.org,
        phil@....cc, haliu@...hat.com
Subject: [PATCH iproute2 v4 1/5] configure: fix parsing issue on include_dir option

configure is stuck in an endless loop if '--include_dir' option is used
without a value:

$ ./configure --include_dir
./configure: line 506: shift: 2: shift count out of range
./configure: line 506: shift: 2: shift count out of range
[...]

Fix it checking that a value is provided with the option.
A dedicated function is used to avoid code duplication, as this check will
be needed for further options that may be introduced in the future.

Fixes: a9c3d70d902a ("configure: add options ability")
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
---
 configure | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 7f4f3bd9..05f75437 100755
--- a/configure
+++ b/configure
@@ -485,7 +485,7 @@ usage()
 {
 	cat <<EOF
 Usage: $0 [OPTIONS]
-	--include_dir		Path to iproute2 include dir
+	--include_dir <dir>	Path to iproute2 include dir
 	--libbpf_dir		Path to libbpf DESTDIR
 	--libbpf_force		Enable/disable libbpf by force. Available options:
 				  on: require link against libbpf, quit config if no libbpf support
@@ -495,6 +495,11 @@ EOF
 	exit $1
 }
 
+check_value()
+{
+	[ -z "$1" ] && usage 1
+}
+
 # Compat with the old INCLUDE path setting method.
 if [ $# -eq 1 ] && [ "$(echo $1 | cut -c 1)" != '-' ]; then
 	INCLUDE="$1"
@@ -503,6 +508,7 @@ else
 		case "$1" in
 			--include_dir)
 				INCLUDE=$2
+				check_value "$INCLUDE"
 				shift 2 ;;
 			--libbpf_dir)
 				LIBBPF_DIR="$2"
-- 
2.31.1