1 files changed, 78 insertions, 0 deletions
diff --git a/lib/lwres/gai_strerror.c b/lib/lwres/gai_strerror.c
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+++ b/lib/lwres/gai_strerror.c
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/* $Id: gai_strerror.c,v 1.22 2007/06/19 23:47:22 tbox Exp $ */
+
+/*! \file gai_strerror.c
+ * lwres_gai_strerror() returns an error message corresponding to an
+ * error code returned by getaddrinfo(). The following error codes and
+ * their meaning are defined in \link netdb.h include/lwres/netdb.h.\endlink
+ *
+ * \li #EAI_ADDRFAMILY address family for hostname not supported
+ * \li #EAI_AGAIN temporary failure in name resolution
+ * \li #EAI_BADFLAGS invalid value for #ai_flags
+ * \li #EAI_FAIL non-recoverable failure in name resolution
+ * \li #EAI_FAMILY ai_family not supported
+ * \li #EAI_MEMORY memory allocation failure
+ * \li #EAI_NODATA no address associated with hostname
+ * \li #EAI_NONAME hostname or servname not provided, or not known
+ * \li #EAI_SERVICE servname not supported for ai_socktype
+ * \li #EAI_SOCKTYPE ai_socktype not supported
+ * \li #EAI_SYSTEM system error returned in errno
+ *
+ * The message invalid error code is returned if ecode is out of range.
+ *
+ * ai_flags, ai_family and ai_socktype are elements of the struct
+ * addrinfo used by lwres_getaddrinfo().
+ *
+ * \section gai_strerror_see See Also
+ *
+ * strerror, lwres_getaddrinfo(), getaddrinfo(), RFC2133.
+ */
+
+#include <config.h>
+
+#include <lwres/netdb.h>
+
+/*% Text of error messages. */
+static const char *gai_messages[] = {
+	"no error",
+	"address family for hostname not supported",
+	"temporary failure in name resolution",
+	"invalid value for ai_flags",
+	"non-recoverable failure in name resolution",
+	"ai_family not supported",
+	"memory allocation failure",
+	"no address associated with hostname",
+	"hostname nor servname provided, or not known",
+	"servname not supported for ai_socktype",
+	"ai_socktype not supported",
+	"system error returned in errno",
+	"bad hints",
+	"bad protocol",
+	"overflow"
+};
+
+/*% Returns an error message corresponding to an error code returned by getaddrinfo() */
+char *
+lwres_gai_strerror(int ecode) {
+	union {
+		const char *const_ptr;
+		char *deconst_ptr;
+	} ptr;
+
+	if ((ecode < 0) ||
+	    (ecode >= (int)(sizeof(gai_messages)/sizeof(*gai_messages))))
+		ptr.const_ptr = "invalid error code";
+	else
+		ptr.const_ptr = gai_messages[ecode];
+	return (ptr.deconst_ptr);
+}