Add reformat target for consistent code formatting.

Signed-off-by: Victor Toni <[email protected]>

Author: ViToni

.clang-format

@@ -0,0 +1,12 @@
+BasedOnStyle: LLVM
+Language: Cpp
+
+IndentWidth: 4
+ContinuationIndentWidth: 8
+
+ColumnLimit: 120
+
+MaxEmptyLinesToKeep: 2
+
+AllowShortFunctionsOnASingleLine: Empty
+AlwaysBreakBeforeMultilineStrings: true

Makefile.am

@@ -8,3 +8,15 @@ ChangeLog:
 AUTHORS: ChangeLog
 	( echo "Authors and contributors, in alphabetical order: "; echo; \
 	sed -r "s/^Author: (.*)/\1/;t;d" $< | sort -u ) > $@
+
+if HAVE_CLANG_FORMAT
+
+.PHONY: reformat
+
+reformat:
+	@echo "Reformatting header files..."
+	@CLANG_FORMAT@ -style=file -i `find . -name "*.h"`
+	@echo "Reformatting C files..."
+	@CLANG_FORMAT@ -style=file -i `find . -name "*.c"`
+
+endif

configure.ac

@@ -5,6 +5,12 @@ AC_CONFIG_SRCDIR([src/igmpproxy.c])
 AC_CONFIG_HEADERS([config.h])
 AC_PROG_CC_C99
 
+AC_CHECK_PROGS(
+    [CLANG_FORMAT], [clang-format clang-format-4.0 clang-format-3.9],
+    [AC_MSG_ERROR([clang-format was not not found during configure.])]
+)
+AM_CONDITIONAL([HAVE_CLANG_FORMAT], [test -n "$CLANG_FORMAT"])
+
 AC_CANONICAL_HOST
 case $host_os in
 	linux*|uclinux*) os=linux;;