From bd63af1c8459d1fdd5e8aa5f596a86dec5539e93 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <miklos@szeredi.hu>
Date: Wed, 23 May 2007 15:21:55 +0000
Subject: [PATCH] lowlevel lib: add fuse_reply_iov function...

---
 ChangeLog               |  6 ++++++
 include/fuse_lowlevel.h | 13 ++++++++++++
 lib/fuse_lowlevel.c     | 46 +++++++++++++++++++++++++++++++----------
 3 files changed, 54 insertions(+), 11 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 284b797..a65048d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-05-23  Miklos Szeredi <miklos@szeredi.hu>
+
+	* lowlevel lib: add fuse_reply_iov function, which is similar to
+	fuse_reply_buf, but accepts a vector of buffers.  Patch by Roger
+	Willcocks
+
 2007-05-21  Miklos Szeredi <miklos@szeredi.hu>
 
 	* Fix Oops or error if a regular file is created with mknod(2) on
diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h
index 8b0e3ee..b55eeb2 100644
--- a/include/fuse_lowlevel.h
+++ b/include/fuse_lowlevel.h
@@ -912,6 +912,19 @@ int fuse_reply_write(fuse_req_t req, size_t count);
  */
 int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size);
 
+/**
+ * Reply with data vector
+ *
+ * Possible requests:
+ *   read, readdir, getxattr, listxattr
+ *
+ * @param req request handle
+ * @param iov the vector containing the data
+ * @param count the size of vector
+ * @return zero for success, -errno for failure to send reply
+ */
+int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count);
+
 /**
  * Reply with filesystem statistics
  *
diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
index f6342b2..43b0364 100644
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -149,12 +149,10 @@ static void free_req(fuse_req_t req)
         destroy_req(req);
 }
 
-static int send_reply(fuse_req_t req, int error, const void *arg,
-                      size_t argsize)
+static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
+                          int count)
 {
     struct fuse_out_header out;
-    struct iovec iov[2];
-    size_t count;
     int res;
 
     if (error <= -1000 || error > 0) {
@@ -164,19 +162,14 @@ static int send_reply(fuse_req_t req, int error, const void *arg,
 
     out.unique = req->unique;
     out.error = error;
-    count = 1;
     iov[0].iov_base = &out;
     iov[0].iov_len = sizeof(struct fuse_out_header);
-    if (argsize && !error) {
-        count++;
-        iov[1].iov_base = (void *) arg;
-        iov[1].iov_len = argsize;
-    }
     out.len = iov_length(iov, count);
 
     if (req->f->debug) {
         printf("   unique: %llu, error: %i (%s), outsize: %i\n",
-               out.unique, out.error, strerror(-out.error), out.len);
+               (unsigned long long) out.unique, out.error,
+               strerror(-out.error), out.len);
         fflush(stdout);
     }
     res = fuse_chan_send(req->ch, iov, count);
@@ -185,6 +178,37 @@ static int send_reply(fuse_req_t req, int error, const void *arg,
     return res;
 }
 
+static int send_reply(fuse_req_t req, int error, const void *arg,
+                      size_t argsize)
+{
+    struct iovec iov[2];
+    int count = 1;
+    if (argsize) {
+        iov[1].iov_base = (void *) arg;
+        iov[1].iov_len = argsize;
+        count++;
+    }
+    return send_reply_iov(req, error, iov, count);
+}
+
+int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
+{
+    int res;
+    struct iovec *padded_iov;
+
+    padded_iov = malloc((count + 1) * sizeof(struct iovec));
+    if (padded_iov == NULL)
+        return fuse_reply_err(req, -ENOMEM);
+
+    memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
+    count++;
+
+    res = send_reply_iov(req, 0, padded_iov, count);
+    free(padded_iov);
+
+    return res;
+}
+
 size_t fuse_dirent_size(size_t namelen)
 {
     return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen);
-- 
2.30.2