From 46f79934b79ef526ed42bbe5a565e6b5d884d24a Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Tue, 4 Jan 2005 21:22:40 +0000
Subject: lib9pclient is the new libfs

---
 src/lib9pclient/read.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/lib9pclient/read.c

(limited to 'src/lib9pclient/read.c')

diff --git a/src/lib9pclient/read.c b/src/lib9pclient/read.c
new file mode 100644
index 00000000..60537288
--- /dev/null
+++ b/src/lib9pclient/read.c
@@ -0,0 +1,72 @@
+/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
+/* See COPYRIGHT */
+
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <9pclient.h>
+#include "fsimpl.h"
+
+long
+fspread(CFid *fid, void *buf, long n, vlong offset)
+{
+	Fcall tx, rx;
+	void *freep;
+	uint msize;
+
+	msize = fid->fs->msize - IOHDRSZ;
+	if(n > msize)
+		n = msize;
+	tx.type = Tread;
+	tx.fid = fid->fid;
+	if(offset == -1){
+		qlock(&fid->lk);
+		tx.offset = fid->offset;
+		qunlock(&fid->lk);
+	}else
+		tx.offset = offset;
+	tx.count = n;
+
+	if(_fsrpc(fid->fs, &tx, &rx, &freep) < 0)
+		return -1;
+	if(rx.type == Rerror){
+		werrstr("%s", rx.ename);
+		free(freep);
+		return -1;
+	}
+	if(rx.count){
+		memmove(buf, rx.data, rx.count);
+		if(offset == -1){
+			qlock(&fid->lk);
+			fid->offset += rx.count;
+			qunlock(&fid->lk);
+		}
+	}
+	free(freep);
+	
+	return rx.count;
+}
+
+long
+fsread(CFid *fid, void *buf, long n)
+{
+	return fspread(fid, buf, n, -1);
+}
+
+long
+fsreadn(CFid *fid, void *buf, long n)
+{
+	long tot, nn;
+
+	for(tot=0; tot<n; tot+=nn){
+		nn = fsread(fid, (char*)buf+tot, n-tot);
+		if(nn <= 0){
+			if(tot == 0)
+				return nn;
+			break;
+		}
+	}
+	return tot;
+}
+			
+
-- 
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