resolv: Move ns_name_compress into its own file and into libc

And reformat to GNU style.

The symbol was moved using scripts/move-symbol-to-libc.py.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

resolv/Makefile

@@ -32,6 +32,7 @@ routines := \
   inet_addr \
   inet_ntop \
   inet_pton \
+  ns_name_compress \
   ns_name_ntop \
   ns_name_pack \
   ns_name_pton \

resolv/Versions

@@ -25,6 +25,7 @@ libc {
 %endif
   }
   GLIBC_2.9 {
+    ns_name_compress;
     ns_name_ntop;
     ns_name_pack;
     ns_name_pton;
@@ -39,6 +40,7 @@ libc {
     gai_suspend;
     getaddrinfo_a;
 %endif
+    ns_name_compress;
     ns_name_ntop;
     ns_name_pack;
     ns_name_pton;
@@ -53,6 +55,7 @@ libc {
     __h_errno;
     __inet_aton_exact;
     __inet_pton_length;
+    __ns_name_compress;
     __ns_name_ntop;
     __ns_name_pack;
     __ns_name_pton;
@@ -155,7 +158,6 @@ libresolv {
     ns_initparse;
     ns_makecanon;
     ns_msg_getflag;
-    ns_name_compress;
     ns_name_ntol;
     ns_name_pton;
     ns_name_rollback;

resolv/ns_name.c

@@ -89,33 +89,6 @@ ns_name_ntol(const u_char *src, u_char *dst, size_t dstsiz)
 	return (dn - dst);
 }
 
-/*%
- *	Compress a domain name into wire format, using compression pointers.
- *
- * return:
- *\li	Number of bytes consumed in `dst' or -1 (with errno set).
- *
- * notes:
- *\li	'dnptrs' is an array of pointers to previous compressed names.
- *\li	dnptrs[0] is a pointer to the beginning of the message.
- *\li	The list ends with NULL.  'lastdnptr' is a pointer to the end of the
- *	array pointed to by 'dnptrs'. Side effect is to update the list of
- *	pointers for labels inserted into the message as we compress the name.
- *\li	If 'dnptr' is NULL, we don't try to compress names. If 'lastdnptr'
- *	is NULL, we don't update the list.
- */
-int
-ns_name_compress(const char *src, u_char *dst, size_t dstsiz,
-		 const u_char **dnptrs, const u_char **lastdnptr)
-{
-	u_char tmp[NS_MAXCDNAME];
-
-	if (ns_name_pton(src, tmp, sizeof tmp) == -1)
-		return (-1);
-	return (ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr));
-}
-libresolv_hidden_def (ns_name_compress)
-
 /*%
  * Reset dnptrs so that there are no active references to pointers at or
  * after src.

resolv/ns_name_compress.c

@@ -0,0 +1,50 @@
+/* Compress a DNS domain name in presentation format.
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <arpa/nameser.h>
+#include <shlib-compat.h>
+
+/* Compresses a domain name into wire format, using compression pointers.
+   Returns the number of bytes consumed in DST or -1 (with errno set).
+
+   DNPTRS is an array of pointers to previous compressed names.
+   DNPTRS[0] is a pointer to the beginning of the message.
+
+   The list ends with NULL.  LASTDNPTR is a pointer to the end of the
+   array pointed to by DNPTRS.  Side effect is to update the list of
+   pointers for labels inserted into the message as we compress the
+   name.  If DNPTRS is NULL, we don't try to compress names.  If
+   LASTDNPTR * is NULL, we don't update the list.  */
+int
+___ns_name_compress (const char *src, unsigned char *dst, size_t dstsiz,
+                     const unsigned char **dnptrs,
+                     const unsigned char **lastdnptr)
+{
+  unsigned char tmp[NS_MAXCDNAME];
+
+  if (__ns_name_pton (src, tmp, sizeof tmp) < 0)
+    return -1;
+  return __ns_name_pack (tmp, dst, dstsiz, dnptrs, lastdnptr);
+}
+versioned_symbol (libc, ___ns_name_compress, ns_name_compress, GLIBC_2_34);
+versioned_symbol (libc, ___ns_name_compress, __ns_name_compress,
+                  GLIBC_PRIVATE);
+libc_hidden_ver (___ns_name_compress, __ns_name_compress)
+
+#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
+compat_symbol (libresolv, ___ns_name_compress, ns_name_compress, GLIBC_2_9);
+#endif