lib: Simplify iov_buf[len]

This makes iov_buf independent of talloc

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

3 files changed, 30 insertions, 31 deletions

diff --git a/source3/lib/iov_buf.c b/source3/lib/iov_buf.c
index dd99da3625..e05dfc9524 100644
--- a/source3/lib/iov_buf.c
+++ b/source3/lib/iov_buf.c
@@ -23,43 +23,33 @@
 
 ssize_t iov_buflen(const struct iovec *iov, int iovcnt)
 {
-	size_t buflen = 0;
+	return iov_buf(iov, iovcnt, NULL, 0);
+}
+
+ssize_t iov_buf(const struct iovec *iov, int iovcnt,
+		uint8_t *buf, size_t buflen)
+{
+	size_t needed = 0;
+	uint8_t *p = buf;
 	int i;
 
 	for (i=0; i<iovcnt; i++) {
 		size_t thislen = iov[i].iov_len;
-		size_t tmp = buflen + thislen;
+		size_t tmp;
+
+		tmp = needed + thislen;
 
-		if ((tmp < buflen) || (tmp < thislen)) {
+		if ((tmp < needed) || (tmp < thislen)) {
 			/* overflow */
 			return -1;
 		}
-		buflen = tmp;
-	}
-	return buflen;
-}
-
-uint8_t *iov_buf(TALLOC_CTX *mem_ctx, const struct iovec *iov, int iovcnt)
-{
-	int i;
-	ssize_t buflen;
-	uint8_t *buf, *p;
+		needed = tmp;
 
-	buflen = iov_buflen(iov, iovcnt);
-	if (buflen == -1) {
-		return NULL;
-	}
-	buf = talloc_array(mem_ctx, uint8_t, buflen);
-	if (buf == NULL) {
-		return NULL;
+		if (needed <= buflen) {
+			memcpy(p, iov[i].iov_base, thislen);
+			p += thislen;
+		}
 	}
 
-	p = buf;
-	for (i=0; i<iovcnt; i++) {
-		size_t len = iov[i].iov_len;
-
-		memcpy(p, iov[i].iov_base, len);
-		p += len;
-	}
-	return buf;
+	return needed;
 }
diff --git a/source3/lib/iov_buf.h b/source3/lib/iov_buf.h
index a884bdbe0e..ec8290989a 100644
--- a/source3/lib/iov_buf.h
+++ b/source3/lib/iov_buf.h
@@ -22,8 +22,10 @@
 
 #include <unistd.h>
 #include <talloc.h>
+#include <stdint.h>
 
 ssize_t iov_buflen(const struct iovec *iov, int iovlen);
-uint8_t *iov_buf(TALLOC_CTX *mem_ctx, const struct iovec *iov, int iovcnt);
+ssize_t iov_buf(const struct iovec *iov, int iovcnt,
+		uint8_t *buf, size_t buflen);
 
 #endif
diff --git a/source3/lib/messages_ctdbd.c b/source3/lib/messages_ctdbd.c
index 59f5976da0..53aeb1fd05 100644
--- a/source3/lib/messages_ctdbd.c
+++ b/source3/lib/messages_ctdbd.c
@@ -100,16 +100,23 @@ static int messaging_ctdb_send(struct server_id src,
 		backend->private_data, struct messaging_ctdbd_context);
 	struct messaging_rec msg;
 	uint8_t *buf;
+	ssize_t buflen;
 	NTSTATUS status;
 
 	if (num_fds > 0) {
 		return ENOSYS;
 	}
 
-	buf = iov_buf(talloc_tos(), iov, iovlen);
-	if (buf == NULL) {
+	buflen = iov_buflen(iov, iovlen);
+	if (buflen == -1) {
+		return EMSGSIZE;
+	}
+
+	buf = talloc_array(talloc_tos(), uint8_t, buflen);
+	if (buflen == NULL) {
 		return ENOMEM;
 	}
+	iov_buf(iov, iovlen, buf, buflen);
 
 	msg = (struct messaging_rec) {
 		.msg_version	= MESSAGE_VERSION,