Apply the first step of the new way to update the link-layer header length

Currently the return value of link-layer dissectors is supposed to be
the length of the link-layer header, so that it can be skipped for -x
and -X.

If a link-layer dissector or a called function throws an exception, it
returns no value, so that length isn't available.

The goal is to change all the link-layer dissectors to be void functions
and dissectors should update a new field of the netdissect_options
structure "link-layer header length" rather than returning it as a value.

In this transition process, the link-layer dissectors will be moved, when
updated, from the uint_printers[] array (named before printers[]) to the
void_printers[] array.

In this transition process, a new field of the netdissect_options
structure, ndo_void_printer (TRUE/FALSE), set in the updated function
lookup_printer(), will permit to choose between the old and new way to
update the link-layer header length.

1 files changed, 1 insertions, 1 deletions

diff --git a/print.h b/print.h
index 70ea9f8e..5e67b33a 100644
--- a/print.h
+++ b/print.h
@@ -32,7 +32,7 @@ void	init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask);
 
 int	has_printer(int type);
 
-if_printer get_if_printer(netdissect_options *ndo, int type);
+if_printer_t get_if_printer(netdissect_options *ndo, int type);
 
 void	pretty_print_packet(netdissect_options *ndo,
 	    const struct pcap_pkthdr *h, const u_char *sp,