1 files changed, 117 insertions, 0 deletions
diff --git a/lib/util/sys_rw_data.c b/lib/util/sys_rw_data.c
new file mode 100644
index 0000000..a0d69f7
--- /dev/null
+++ b/lib/util/sys_rw_data.c
@@ -0,0 +1,117 @@
+/*
+ * 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;
+}