scripts: add a script for checking presence of <endian.h>

Change-Id: I6a1e7fc2e96f42fc596f47b4d7f1ac6c61d834b6

scripts/verify_endian_header.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# Usage: ./verify_endian_header.sh $(find . -name "*.[hc]")
+
+HEADER="osmocom/core/endian.h"
+COUNT=0
+
+for f in $*; do
+	# Obviously, ignore the header file defining the macros
+	if [ $(basename $f) = $(basename $HEADER) ]; then
+		continue
+	fi
+	# Match files using either of OSMO_IS_{LITTLE,BIG}_ENDIAN
+	if grep -q "OSMO_IS_\(LITTLE\|BIG\)_ENDIAN" $f; then
+		# The header file must be included
+		if ! grep -q "#include <$HEADER>" $f; then
+			echo "File '$f' does not #include <$HEADER>"
+			COUNT=$((COUNT + 1))
+		fi
+	fi
+done
+
+exit $COUNT