resolver:

res_query: do not unconditionally set h_errno to TRY_AGAIN (closes bug 173).
cleanups: s/__dn_expand/dn_expand/, remove superfluous dn_expand declaration,
remove libc_hidden_proto junk

libc/inet/resolv.c

@@ -1,3 +1,4 @@
+/* vi: set sw=4 ts=4: */
 /* resolv.c: DNS Resolver
  *
  * Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>,
@@ -173,61 +174,6 @@
 # define USE_SELECT
 #endif
 
-/* Experimentally off - libc_hidden_proto(memcpy) */
-/* Experimentally off - libc_hidden_proto(memset) */
-/* Experimentally off - libc_hidden_proto(memmove) */
-/* Experimentally off - libc_hidden_proto(strchr) */
-/* Experimentally off - libc_hidden_proto(strcmp) */
-/* Experimentally off - libc_hidden_proto(strcpy) */
-/* Experimentally off - libc_hidden_proto(strdup) */
-/* Experimentally off - libc_hidden_proto(strlen) */
-/* Experimentally off - libc_hidden_proto(strncat) */
-/* Experimentally off - libc_hidden_proto(strncpy) */
-/* libc_hidden_proto(strnlen) */
-/* Experimentally off - libc_hidden_proto(strstr) */
-/* Experimentally off - libc_hidden_proto(strcasecmp) */
-/* libc_hidden_proto(socket) */
-/* libc_hidden_proto(close) */
-/* libc_hidden_proto(fopen) */
-/* libc_hidden_proto(fclose) */
-/* libc_hidden_proto(random) */
-/* libc_hidden_proto(getservbyport) */
-/* libc_hidden_proto(gethostname) */
-/* libc_hidden_proto(uname) */
-/* libc_hidden_proto(inet_addr) */
-/* libc_hidden_proto(inet_aton) */
-/* libc_hidden_proto(inet_pton) */
-/* libc_hidden_proto(inet_ntop) */
-/* libc_hidden_proto(connect) */
-/* libc_hidden_proto(poll) */
-/* libc_hidden_proto(select) */
-/* libc_hidden_proto(recv) */
-/* libc_hidden_proto(send) */
-/* libc_hidden_proto(printf) */
-/* libc_hidden_proto(sprintf) */
-/* libc_hidden_proto(snprintf) */
-/* libc_hidden_proto(fgets) */
-/* libc_hidden_proto(getnameinfo) */
-/* libc_hidden_proto(gethostbyname) */
-/* libc_hidden_proto(gethostbyname_r) */
-/* libc_hidden_proto(gethostbyname2_r) */
-/* libc_hidden_proto(gethostbyaddr) */
-/* libc_hidden_proto(gethostbyaddr_r) */
-/* libc_hidden_proto(ns_name_uncompress) */
-/* libc_hidden_proto(ns_name_unpack) */
-/* libc_hidden_proto(ns_name_ntop) */
-/* libc_hidden_proto(res_init) */
-/* libc_hidden_proto(res_query) */
-/* libc_hidden_proto(res_querydomain) */
-/* libc_hidden_proto(gethostent_r) */
-/* libc_hidden_proto(fprintf) */
-/* libc_hidden_proto(__h_errno_location) */
-#ifdef __UCLIBC_HAS_XLOCALE__
-/* libc_hidden_proto(__ctype_b_loc) */
-#elif defined __UCLIBC_HAS_CTYPE_TABLES__
-/* libc_hidden_proto(__ctype_b) */
-#endif
-
 #if defined __UCLIBC_HAS_IPV4__ && defined __UCLIBC_HAS_IPV6__
 #define IF_HAS_BOTH(...) __VA_ARGS__
 #else
@@ -364,8 +310,6 @@ extern int __decode_answer(const unsigned char * message, int offset,
 extern int __length_question(const unsigned char * const message, int offset) attribute_hidden;
 extern void __open_nameservers(void) attribute_hidden;
 extern void __close_nameservers(void) attribute_hidden;
-extern int __dn_expand(const u_char *, const u_char *, const u_char *,
-			char *, int);
 
 /*
  * Theory of operation.
@@ -2485,7 +2429,7 @@ libc_hidden_def(gethostbyaddr)
  * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
  * Return size of compressed name or -1 if there was an error.
  */
-int __dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
+int dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
 				char *dst, int dstsiz)
 {
 	int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
@@ -2875,7 +2819,8 @@ int res_query(const char *dname, int class, int type,
 	i = __dns_lookup(dname, type, &packet, &a);
 
 	if (i < 0) {
-		h_errno = TRY_AGAIN;
+		if (!h_errno) /* TODO: can this ever happen? */
+			h_errno = TRY_AGAIN;
 		return -1;
 	}
 
@@ -3107,10 +3052,9 @@ int res_querydomain(const char *name, const char *domain, int class, int type,
 	return res_query(longname, class, type, answer, anslen);
 }
 libc_hidden_def(res_querydomain)
+#endif
+
+/* Unimplemented: */
 /* res_mkquery */
 /* res_send */
 /* dn_comp */
-/* dn_expand */
-#endif
-
-/* vi: set sw=4 ts=4: */