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/*
* Unix SMB/CIFS implementation.
* Samba system utilities
* Copyright (C) Andrew Tridgell 1992-1998
* Copyright (C) Jeremy Allison 1998-2005
* Copyright (C) Timur Bakeyev 2005
* Copyright (C) Bjoern Jacke 2006-2007
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "lib/util/sys_rw_data.h"
#include "lib/util/sys_rw.h"
#include "lib/util/iov_buf.h"
/****************************************************************************
Write all data from an iov array
NB. This can be called with a non-socket fd, don't add dependencies
on socket calls.
****************************************************************************/
ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
{
ssize_t to_send;
ssize_t thistime;
size_t sent;
struct iovec iov_copy[iovcnt];
struct iovec *iov;
to_send = iov_buflen(orig_iov, iovcnt);
if (to_send == -1) {
errno = EINVAL;
return -1;
}
thistime = sys_writev(fd, orig_iov, iovcnt);
if ((thistime <= 0) || (thistime == to_send)) {
return thistime;
}
sent = thistime;
/*
* We could not send everything in one call. Make a copy of iov that
* we can mess with.
*/
memcpy(iov_copy, orig_iov, sizeof(struct iovec) * iovcnt);
iov = iov_copy;
while (sent < (size_t)to_send) {
bool ok;
ok = iov_advance(&iov, &iovcnt, thistime);
if (!ok) {
errno = EIO;
return -1;
}
thistime = sys_writev(fd, iov, iovcnt);
if (thistime <= 0) {
break;
}
sent += thistime;
}
return sent;
}
/****************************************************************************
Write data to a fd.
NB. This can be called with a non-socket fd, don't add dependencies
on socket calls.
****************************************************************************/
ssize_t write_data(int fd, const void *buffer, size_t n)
{
struct iovec iov;
iov.iov_base = discard_const_p(void, buffer);
iov.iov_len = n;
return write_data_iov(fd, &iov, 1);
}
/*
* Blocking read n bytes from a fd
*/
ssize_t read_data(int fd, void *buffer, size_t n)
{
ssize_t nread;
nread = 0;
while ((size_t)nread < n) {
ssize_t ret;
ret = sys_read(fd, ((char *)buffer) + nread, n - nread);
if (ret <= 0) {
return ret;
}
nread += ret;
}
return nread;
}
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