Add ldap_pvt_gai_strerror().

Calls to gai_strerror() should be replaced with calls AC_GAI_STRERROR().

include/ac/socket.h

@@ -193,4 +193,13 @@ LDAP_F (int) ldap_pvt_inet_aton LDAP_P(( const char *, struct in_addr * ));
 #	define INET6_ADDRSTRLEN 46
 #endif
 
+#ifdef HAVE_GETADDRINFO
+#	ifdef HAVE_GAI_STRERROR
+#		define AC_GAI_STRERROR(x)	(gai_strerror((x)))
+#	else
+#		define AC_GAI_STRERROR(x)	(ldap_pvt_gai_strerror((x)))
+		char * ldap_pvt_gai_strerror( int );
+#	endif
+#endif
+
 #endif /* _AC_SOCKET_H_ */

libraries/libldap/util-int.c

@@ -413,3 +413,39 @@ char * ldap_pvt_get_fqdn( char *name )
 	LDAP_FREE( ha_buf );
 	return fqdn;
 }
+
+#if defined( HAVE_GETADDRINFO ) && !defined( HAVE_GAI_STRERROR )
+char *ldap_pvt_gai_strerror (int code) {
+	static struct {
+		int code;
+		const char *msg;
+	} values[] = {
+#ifdef EAI_ADDRFAMILY
+		{ EAI_ADDRFAMILY, "Address family for hostname not supported" },
+#endif
+		{ EAI_AGAIN, "Temporary failure in name resolution" },
+		{ EAI_BADFLAGS, "Bad value for ai_flags" },
+		{ EAI_FAIL, "Non-recoverable failure in name resolution" },
+		{ EAI_FAMILY, "ai_family not supported" },
+		{ EAI_MEMORY, "Memory allocation failure" },
+#ifdef EAI_NODATA
+		{ EAI_NODATA, "No address associated with hostname" },
+#endif    
+		{ EAI_NONAME, "Name or service not known" },
+		{ EAI_SERVICE, "Servname not supported for ai_socktype" },
+		{ EAI_SOCKTYPE, "ai_socktype not supported" },
+		{ EAI_SYSTEM, "System error" },
+		{ 0, NULL }
+	};
+
+	int i;
+
+	for ( i = 0; values[i].msg != NULL; i++ ) {
+		if ( values[i].code == code ) {
+			return (char *) values[i].msg;
+		}
+	}
+	
+	return "Unknown error";
+}
+#endif