Miscellaneous code cleaning

- add <stdarg.h> or <varargs.h> in snprintf.h
  and remove those inclusions in the other #ifdef NEED_SNPRINTF_H codes

- remove the check of multiple inclusions in source (.c)  code
  (there is a bit loss of _cpp_ performance, but I prefer the gain of
   code reading and maintenance; and nowadays, disk caches and VM are
   correctly optimized ;-).

- protect all (well almost) header files against multiple inclusions

- add header (i.e. GPL license) in some include files

- reorganize a bit the way header files are included:

  First:
  #include <system_include_files>
  #include <external_package_include_files (e.g. gtk, glib etc.)>
  Then
  #include "ethereal_include_files"

  with the correct HAVE_XXX or NEED_XXX protections.

- add some HAVE_XXX checks before including some system header files

- add the same HAVE_XXX in wiretap as in ethereal

Please forgive me, if I break something (I've only compiled and regression
tested on Linux).

svn path=/trunk/; revision=2254

1 files changed, 6 insertions, 1 deletions

diff --git a/wiretap/nettl.h b/wiretap/nettl.h
index 5e9fc469f9..397e544d14 100644
--- a/wiretap/nettl.h
+++ b/wiretap/nettl.h
@@ -1,6 +1,6 @@
 /* nettl.h
  *
- * $Id: nettl.h,v 1.4 2000/02/17 21:08:15 oabad Exp $
+ * $Id: nettl.h,v 1.5 2000/08/11 13:32:34 deniel Exp $
  *
  * Wiretap Library
  * Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
@@ -21,6 +21,9 @@
  *
  */
 
+#ifndef __NETTL_H__
+#define __NETTL_H__
+
 #define NETTL_SUBSYS_NS_LS_LOGGING	0x00
 #define NETTL_SUBSYS_NS_LS_NFT		0x01
 #define NETTL_SUBSYS_NS_LS_LOOPBACK	0x02
@@ -66,3 +69,5 @@
 #define NETTL_SUBSYS_EM			0x7C
 
 int nettl_open(wtap *wth, int *err);
+
+#endif