Imported Upstream version 2.5.0

[debian/amanda] / common-src / writev.c

diff --git a/common-src/writev.c b/common-src/writev.c
new file mode 100644 (file)
index 0000000..2d5317b
--- /dev/null
+++ b/common-src/writev.c
@@ -0,0 +1,69 @@
+/*
+ * Amanda, The Advanced Maryland Automatic Network Disk Archiver
+ * Copyright (c) 1991-1998 University of Maryland at College Park
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, 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 U.M. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  U.M. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ *
+ * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
+ * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Authors: the Amanda Development Team.  Its members are listed in a
+ * file named AUTHORS, in the root directory of this distribution.
+ */
+/*
+ * $Id: writev.c,v 1.2 1999/03/04 22:40:08 kashmir Exp $
+ *
+ * emulation of writev that simply copies all iovecs into a contiguous
+ * buffer and writes that out in one write.
+ */
+
+#include "amanda.h"
+#ifndef HAVE_WRITEV
+
+ssize_t
+writev(fd, iov, iovcnt)
+    int fd;
+    const struct iovec *iov;
+    int iovcnt;
+{
+    size_t bufsize;
+    int i;
+    ssize_t ret;
+    char *buf, *writeptr;
+
+    /*
+     * Get the sum of the iovecs, and allocate a suitably sized buffer
+     */
+    for (bufsize = 0, i = 0; i < iovcnt; i++)
+       bufsize += iov[i].iov_len;
+    buf = alloc(bufsize);
+
+    /*
+     * Copy each iovec back to back into the buffer
+     */
+    for (writeptr = buf, i = 0; i < iovcnt; i++) {
+       memcpy(writeptr, iov[i].iov_base, iov[i].iov_len);
+       writeptr += iov[i].iov_len;
+    }
+
+    /*
+     * Write the buffer, free it, and return write's result
+     */
+    ret = write(fd, buf, bufsize);
+    amfree(buf);
+    return (ret);
+}
+#endif /* HAVE_WRITEV */