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-rw-r--r--ares/ares_writev.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/ares/ares_writev.c b/ares/ares_writev.c
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+
+/* $Id$ */
+
+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "setup.h"
+
+#include <limits.h>
+#include "ares.h"
+#include "ares_private.h"
+
+#ifndef HAVE_WRITEV
+ssize_t ares_writev(ares_socket_t s, const struct iovec *iov, int iovcnt)
+{
+ char *buffer, *bp;
+ int i;
+ size_t bytes = 0;
+ ssize_t result;
+
+ /* Validate iovcnt */
+ if (iovcnt <= 0)
+ {
+ SET_ERRNO(EINVAL);
+ return (-1);
+ }
+
+ /* Validate and find the sum of the iov_len values in the iov array */
+ for (i = 0; i < iovcnt; i++)
+ {
+ if (iov[i].iov_len > INT_MAX - bytes)
+ {
+ SET_ERRNO(EINVAL);
+ return (-1);
+ }
+ bytes += iov[i].iov_len;
+ }
+
+ if (bytes == 0)
+ return (0);
+
+ /* Allocate a temporary buffer to hold the data */
+ buffer = malloc(bytes);
+ if (!buffer)
+ {
+ SET_ERRNO(ENOMEM);
+ return (-1);
+ }
+
+ /* Copy the data into buffer */
+ for (bp = buffer, i = 0; i < iovcnt; ++i)
+ {
+ memcpy (bp, iov[i].iov_base, iov[i].iov_len);
+ bp += iov[i].iov_len;
+ }
+
+ /* Send buffer contents */
+ result = swrite(s, buffer, bytes);
+
+ free(buffer);
+
+ return (result);
+}
+#endif
+