From b0e2dda829db4560e2c0ed7556803124a396b89f Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Mon, 07 Mar 2005 21:04:49 +0000
Subject: prebuffering of output is controllable now.

---
diff --git a/include/sitecing/sitecing_interface_cgi.h b/include/sitecing/sitecing_interface_cgi.h
index cab947c..da538d6 100644
--- a/include/sitecing/sitecing_interface_cgi.h
+++ b/include/sitecing/sitecing_interface_cgi.h
@@ -36,7 +36,15 @@ namespace sitecing {
 	    /**
 	     * Here is where we prebuffer output.
 	     */
-	    ostringstream prebuffer;
+	    stringbuf prebuffer;
+	    /**
+	     * Output stream, initially going to prebuffer.
+	     */
+	    ostream outs;
+	    /**
+	     * Have headers been sent yet?
+	     */
+	    bool headers_flushed;
 	    /**
 	     * Pointer to the sitespace object.
 	     */
@@ -48,13 +56,26 @@ namespace sitecing {
 	    sitecing_interface_cgi(sitespace *s);
 
 	    /**
-	     * @todo TODO: wish I could remember -- document me.
+	     * Set up interface for the (possibly, new) cgi gateway object,
+	     * reset headers, empty buffer, etc.
 	     */
 	    void prepare(kingate::cgi_gateway *cg);
 	    /**
-	     * @todo TODO: wish I could remember -- document me.
+	     * Flush output stream.
+	     */
+	    void flush(bool keep_buffering=false);
+	    /**
+	     * Send headers to the output stream, if we haven't yet.
+	     */
+	    void flush_headers();
+	    /**
+	     * Are we buffering now?
+	     */
+	    bool is_buffering();
+	    /**
+	     * Control output buffering.
 	     */
-	    void flush();
+	    void set_buffering(bool do_buffer);
 
     };
 }
diff --git a/lib/sitecing_interface_cgi.cc b/lib/sitecing_interface_cgi.cc
index 5c3d295..f2bd093 100644
--- a/lib/sitecing_interface_cgi.cc
+++ b/lib/sitecing_interface_cgi.cc
@@ -4,7 +4,7 @@
 namespace sitecing {
 
     sitecing_interface_cgi::sitecing_interface_cgi(sitespace *s)
-	: sitecing_interface(&prebuffer), ss(s), cgigw(NULL) {
+	: outs(&prebuffer), sitecing_interface(&outs), ss(s), cgigw(NULL), headers_flushed(false) {
 	}
 
     void sitecing_interface_cgi::prepare(kingate::cgi_gateway *cg) {
@@ -12,14 +12,40 @@ namespace sitecing {
 	headers.clear();
 	headers["Content-Type"] = "text/html";
 	prebuffer.str("");
+	headers_flushed = false;
+	set_buffering(true);
     }
 
-    void sitecing_interface_cgi::flush() {
+    void sitecing_interface_cgi::flush(bool keep_buffering) {
 	assert(cgigw);
+	flush_headers();
+	if(is_buffering()) {
+	    streampos count = prebuffer.pubseekoff(0,ios_base::cur,ios_base::out);
+	    cgigw->out().write(prebuffer.str().c_str(),count);
+	    prebuffer.str("");
+	}
+	cgigw->out().flush();
+	set_buffering(keep_buffering);
+    }
+
+    void sitecing_interface_cgi::set_buffering(bool do_buffer) {
+	if(!do_buffer)
+	    flush_headers();
+	outs.rdbuf(do_buffer?&prebuffer:cgigw->out().rdbuf());
+    }
+
+    bool sitecing_interface_cgi::is_buffering() {
+	return outs.rdbuf()==&prebuffer;
+    }
+
+    void sitecing_interface_cgi::flush_headers() {
+	assert(cgigw);
+	if(headers_flushed)
+	    return;
 	for(headers_t::const_iterator i=headers.begin();i!=headers.end();i++)
 	    cgigw->out() << i->first << ": " << i->second << "\n";
-	(cgigw->out() << "\n").write(prebuffer.str().c_str(),prebuffer.tellp());
-	cgigw->out().flush();
+	cgigw->out() << "\n";
+	headers_flushed = true;
     }
 
 }
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