From dfe57535afa96031add209ab71ef052178951aec Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Thu, 19 Jun 2008 23:07:48 -0400
Subject: 9p: fix writen (sqweek)

---
 src/cmd/9p.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

(limited to 'src/cmd/9p.c')

diff --git a/src/cmd/9p.c b/src/cmd/9p.c
index 689e00ee..135d9c50 100644
--- a/src/cmd/9p.c
+++ b/src/cmd/9p.c
@@ -28,16 +28,21 @@ usage(void)
 int
 writen(int fd, void *buf, int n)
 {
-	long m, tot;
+	int m, tot;
 
-	for(tot=0; tot<n; tot+=m){
-		m = n - tot;
-		if(m > 8192)
-			m = 8192;
-		if(write(fd, (uchar*)buf+tot, m) != m)
-			break;
+	if(n < 0){
+		werrstr("bad count");
+		return -1;
 	}
-	return tot;
+	if(n == 0)
+		return 0;
+	
+	tot = 0;
+	while((m = write(fd, (char*)buf+tot, n-tot)) > 0)
+		tot += m;
+	if(tot < n)
+		return -1;
+	return n;
 }
 
 CFsys *(*nsmnt)(char*, char*) = nsamount;
-- 
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