Minimally resurrect doxygen documentation

The documentation was written in the days before doxygen required groups or even
doxygen.cfg, so create doxygen.cfg.in and introduce one \defgroup per source
file, encompassing pretty-much the whole file.

Also add a tiny \mainpage.

Added:

 doxygen.cfg.in: Same as for libmnl except FILE_PATTERNS = *.c libnfnetlink.h

Updated:

 configure.ac: Create doxygen.cfg

 src/iftable.c: Add defgroup

 src/libnfnetlink.c: Add mainpage and defgroup

Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/iftable.c b/src/iftable.c
index 157f97b..6d1d135 100644
--- a/src/iftable.c
+++ b/src/iftable.c
@@ -24,6 +24,11 @@
 #include "rtnl.h"
 #include "linux_list.h"
 
+/**
+ * \defgroup iftable Functions in iftable.c
+ * @{
+ */
+
 struct ifindex_node {
 	struct list_head head;
 
@@ -333,3 +338,7 @@ int nlif_fd(struct nlif_handle *h)
 
 	return -1;
 }
+
+/**
+ * @}
+ */