File system stuff.

src/libfs/read.c

@@ -0,0 +1,48 @@
+/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
+/* See COPYRIGHT */
+
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <fs.h>
+#include "fsimpl.h"
+
+long
+fspread(Fid *fid, void *buf, long n, vlong offset)
+{
+	Fcall tx, rx;
+	void *freep;
+
+	tx.type = Tread;
+	if(offset == -1){
+		qlock(&fid->lk);
+		tx.offset = fid->offset;
+		qunlock(&fid->lk);
+	}else
+		tx.offset = offset;
+	tx.count = n;
+
+	fsrpc(fid->fs, &tx, &rx, &freep);
+	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);
+			tx.offset += n;
+			qunlock(&fid->lk);
+		}
+	}
+	free(freep);
+	
+	return rx.count;
+}
+
+long
+fsread(Fid *fid, void *buf, long n)
+{
+	return fspread(fid, buf, n, -1);
+}