1 files changed, 111 insertions, 0 deletions
diff --git a/src/spdk/lib/util/iov.c b/src/spdk/lib/util/iov.c
new file mode 100644
index 000000000..e89ef9d21
--- /dev/null
+++ b/src/spdk/lib/util/iov.c
@@ -0,0 +1,111 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "spdk/util.h"
+
+size_t
+spdk_iovcpy(struct iovec *siov, size_t siovcnt, struct iovec *diov, size_t diovcnt)
+{
+	size_t total_sz;
+	size_t sidx;
+	size_t didx;
+	int siov_len;
+	uint8_t *siov_base;
+	int diov_len;
+	uint8_t *diov_base;
+
+	/* d prefix = destination. s prefix = source. */
+
+	assert(diovcnt > 0);
+	assert(siovcnt > 0);
+
+	total_sz = 0;
+	sidx = 0;
+	didx = 0;
+	siov_len = siov[0].iov_len;
+	siov_base = siov[0].iov_base;
+	diov_len = diov[0].iov_len;
+	diov_base = diov[0].iov_base;
+	while (siov_len > 0 && diov_len > 0) {
+		if (siov_len == diov_len) {
+			memcpy(diov_base, siov_base, siov_len);
+			total_sz += siov_len;
+
+			/* Advance both iovs to the next element */
+			sidx++;
+			if (sidx == siovcnt) {
+				break;
+			}
+
+			didx++;
+			if (didx == diovcnt) {
+				break;
+			}
+
+			siov_len = siov[sidx].iov_len;
+			siov_base = siov[sidx].iov_base;
+			diov_len = diov[didx].iov_len;
+			diov_base = diov[didx].iov_base;
+		} else if (siov_len < diov_len) {
+			memcpy(diov_base, siov_base, siov_len);
+			total_sz += siov_len;
+
+			/* Advance only the source to the next element */
+			sidx++;
+			if (sidx == siovcnt) {
+				break;
+			}
+
+			diov_base += siov_len;
+			diov_len -= siov_len;
+			siov_len = siov[sidx].iov_len;
+			siov_base = siov[sidx].iov_base;
+		} else {
+			memcpy(diov_base, siov_base, diov_len);
+			total_sz += diov_len;
+
+			/* Advance only the destination to the next element */
+			didx++;
+			if (didx == diovcnt) {
+				break;
+			}
+
+			siov_base += diov_len;
+			siov_len -= diov_len;
+			diov_len = diov[didx].iov_len;
+			diov_base = diov[didx].iov_base;
+		}
+	}
+
+	return total_sz;
+}