Bug fix for sending partial files using ne_set_request_body_fd()

[Joe Orton]

On Wed, Mar 10, 2010 at 05:22:22PM -0800, Lou Montulli wrote:
> The bug is caused by "body_fd_send()" not decrementing
> "req->body.file.remain" after reading from the file.    Eventually "read()"
> returns "0" when it reaches the end of the file, so this bug doesn't effect
> a full file send.

Ouch!  Good catch.  Thanks for the report and patch.  I'm going to 
commit something slightly more complex, which also adds handling of 
read() errors:

Index: src/ne_request.c
===================================================================
--- src/ne_request.c	(revision 1792)
+++ src/ne_request.c	(working copy)
@@ -1,6 +1,6 @@
 /* 
    HTTP request/response handling
-   Copyright (C) 1999-2009, Joe Orton <joe at manyfish.co.uk>
+   Copyright (C) 1999-2010, Joe Orton <joe at manyfish.co.uk>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ -284,6 +284,8 @@
     ne_request *req = userdata;
 
     if (count) {
+        ssize_t ret;
+
         if (req->body.file.remain == 0)
             return 0;
 
@@ -292,7 +294,26 @@
          * and 64-bit off64_t: */
         if ((ne_off_t)count > req->body.file.remain)
             count = (size_t)req->body.file.remain;
-	return read(req->body.file.fd, buffer, count);
+        
+        ret = read(req->body.file.fd, buffer, count);
+        if (ret > 0) {
+            req->body.file.remain -= ret;
+            return ret;
+        }
+        else if (ret == 0) {
+            ne_set_error(req->session, 
+                         _("Premature EOF in request body file"));
+        }
+        else if (ret < 0) {
+            char err[200];
+            int errnum = errno;
+
+            ne_set_error(req->session, 
+                         _("Failed reading request body file: %s"),
+                         ne_strerror(errnum, err, sizeof err));
+        }
+
+        return -1;
     } else {
         ne_off_t newoff;