[PATCH] compat_sendfile: ensure this works without an offset

[Eric Wong <e@80x24.org>]

While we never call sendfile without an offset, some projects
may copy our code and want to use it without an offset.
---
 compat_sendfile.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/compat_sendfile.h b/compat_sendfile.h
index 8413891..c1cc9e4 100644
--- a/compat_sendfile.h
+++ b/compat_sendfile.h
@@ -12,14 +12,15 @@ static ssize_t compat_sendfile(int sockfd, int filefd, off_t *off, size_t count)
 
 	max_pread = MIN(max_pread, count);
 	do {
-		r = pread(filefd, buf, max_pread, *off);
+		r = off ? pread(filefd, buf, max_pread, *off) :
+			read(filefd, buf, max_pread);
 	} while (r < 0 && errno == EINTR);
 
 	if (r <= 0)
 		return r;
 
 	w = write(sockfd, buf, r);
-	if (w > 0)
+	if (w > 0 && off)
 		*off += w;
 	return w;
 }
-- 
EW