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authorChris Toshok <toshok@ximian.com>2001-04-23 10:53:27 +0800
committerChris Toshok <toshok@src.gnome.org>2001-04-23 10:53:27 +0800
commitf726a8e69eb490af18825ca2ced6e43b9ba7c8cd (patch)
tree5630a024fdfa1288a5a3f69ddc68bfbac3d75a9a /e-util/e-host-utils.c
parent2439e91a5c2033c26f014c826e99aa44aa80d08e (diff)
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add e-host-utils.[ch]
2001-04-22 Chris Toshok <toshok@ximian.com> * Makefile.am (libeutil_la_SOURCES): add e-host-utils.[ch] * e-host-utils.c: new file, with e_gethostbyname_r. * e-host-utils.h: new file. svn path=/trunk/; revision=9502
Diffstat (limited to 'e-util/e-host-utils.c')
-rw-r--r--e-util/e-host-utils.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/e-util/e-host-utils.c b/e-util/e-host-utils.c
new file mode 100644
index 0000000000..9dfbcc1f59
--- /dev/null
+++ b/e-util/e-host-utils.c
@@ -0,0 +1,139 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+/* e-host-utils.c
+ *
+ * Copyright (C) 2001 Helix Code, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Chris Toshok
+ */
+
+#include <config.h>
+#include "e-msgport.h"
+#include "e-host-utils.h"
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#ifndef HAVE_GETHOSTBYNAME_R
+static EMutex *gethost_mutex = NULL;
+#endif
+
+void
+e_gethostbyname_init ()
+{
+#ifndef HAVE_GETHOSTBYNAME_R
+ if (gethost_mutex)
+ return;
+
+ gethost_mutex = e_mutex_new (E_MUTEX_SIMPLE);
+#endif
+}
+
+int
+e_gethostbyname_r (const char *name, struct hostent *host,
+ char *buf, int buflen, int *herr)
+{
+#ifdef HAVE_GETHOSTBYNAME_R
+#ifdef GETHOSTBYNAME_R_FIVE_ARGS
+ return gethostbyname_r(name, host, buf, buflen, herr);
+#else
+ struct hostent *hp;
+ return gethostbyname_r(name, host, buf, buflen, &hp, herr);
+#endif
+#else
+ int i;
+ char *p;
+ struct hostent *h;
+ int req_length;
+ int num_aliases = 0, num_addrs = 0;
+
+ if (!gethost_mutex) {
+ g_warning ("mutex wasn't initialized - you must call e_gethostbyname_init before e_gethostbyname_r\n");
+ return -1;
+ }
+
+ e_mutex_lock (gethost_mutex);
+
+ h = gethostbyname (name);
+
+ if (!h) {
+ e_mutex_unlock (gethost_mutex);
+ return -1;
+ }
+
+ /* check to make sure we have enough room in our buffer */
+ req_length = 0;
+ if (h->h_aliases) {
+ for (i = 0; h->h_aliases[i]; i ++)
+ req_length += strlen (h->h_aliases[i]) + 1;
+ num_aliases = i + 1;
+ }
+ if (h->h_addr_list) {
+ for (i = 0; h->h_addr_list[i]; i ++)
+ req_length += h->h_length;
+ num_addrs = i + 1;
+ }
+
+ if (buflen < req_length) {
+ *herr = ERANGE;
+ e_mutex_unlock (gethost_mutex);
+ return -1;
+ }
+
+ if (num_aliases)
+ host->h_aliases = malloc (sizeof (char*) * num_aliases);
+ else
+ host->h_aliases = NULL;
+ if (num_addrs)
+ host->h_addr_list = malloc (sizeof (char*) * num_addrs);
+ else
+ host->h_addr_list = NULL;
+
+ host->h_name = strdup (h->h_name);
+ host->h_addrtype = h->h_addrtype;
+ host->h_length = h->h_length;
+
+ /* copy the aliases/addresses into the buffer, and assign the
+ pointers into the hostent */
+ *buf = 0;
+ p = buf;
+ if (num_aliases) {
+ for (i = 0; h->h_aliases[i]; i ++) {
+ strcpy (buf, h->h_aliases[i]);
+ host->h_aliases[i] = p;
+ p += strlen (h->h_aliases[i]);
+ }
+ host->h_aliases[num_aliases - 1] = NULL;
+ }
+
+ if (num_addrs) {
+ for (i = 0; h->h_addr_list[i]; i ++) {
+ memcpy (buf, h->h_addr_list[i], h->h_length);
+ host->h_addr_list[i] = p;
+ p += h->h_length;
+ }
+ host->h_addr_list[num_addrs - 1] = NULL;
+ }
+
+ *herr = h_errno;
+
+ e_mutex_unlock (gethost_mutex);
+
+ return 0;
+#endif
+}