Enable ether name resolution for packet summary lines of IPX packets

(in the src/dst of the CList). In order to do this, I had to:

1. Add a new function, ether_to_str_punct(const guint8*, char) which
	turns a 6-byt ether address into a string, using whatever punctuation
	is passed as the char. If a null char is passed, no separator
	is put between the hex digits. Unresolved IPX addresses look better
	with the ether portion having no punctuation (IMHO)

2. Changed ether_to_str() to call ether_to_str_punct with ':' as the char
	argument. That is, code abstraction.

3. MAXNAMELEN was moved from resolv.c to resolv.h so that packet-ipx.c
	could see it.

4. A new resolve function, get_ether_name_if_known(), returns the resolved name
	of an ether address, or NULL if there is none.  This differs
	from get_ether_name() by returning NULL rather than a text version
	of the ether address.

svn path=/trunk/; revision=1076

1 files changed, 17 insertions, 3 deletions

diff --git a/packet.c b/packet.c
index 48f158cd73..fa9ee0ea5b 100644
--- a/packet.c
+++ b/packet.c
@@ -1,7 +1,7 @@
 /* packet.c
  * Routines for packet disassembly
  *
- * $Id: packet.c,v 1.55 1999/11/17 21:58:32 guy Exp $
+ * $Id: packet.c,v 1.56 1999/11/20 05:35:14 gram Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -76,8 +76,21 @@ static int hf_frame_capture_len = -1;
 
 static gint ett_frame = -1;
 
+/* Wrapper for the most common case of asking
+ * for a string using a colon as the hex-digit separator.
+ */
+gchar *
+ether_to_str(const guint8 *ad)
+{
+	return ether_to_str_punct(ad, ':');
+}
+
+/* Places char punct in the string as the hex-digit separator.
+ * If punct is '\0', no punctuation is applied (and thus
+ * the resulting string is 5 bytes shorter)
+ */
 gchar *
-ether_to_str(const guint8 *ad) {
+ether_to_str_punct(const guint8 *ad, char punct) {
   static gchar  str[3][18];
   static gchar *cur;
   gchar        *p;
@@ -102,7 +115,8 @@ ether_to_str(const guint8 *ad) {
     *--p = hex_digits[octet&0xF];
     if (i == 0)
       break;
-    *--p = ':';
+    if (punct)
+      *--p = punct;
     i--;
   }
   return p;