From d3df308747ee4d1fcc063a348dcf1146b390bda7 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Sat, 6 Dec 2003 18:08:52 +0000
Subject: File system stuff.

---
 src/lib9/read9pmsg.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/lib9/read9pmsg.c

(limited to 'src/lib9/read9pmsg.c')

diff --git a/src/lib9/read9pmsg.c b/src/lib9/read9pmsg.c
new file mode 100644
index 00000000..9e90ec5d
--- /dev/null
+++ b/src/lib9/read9pmsg.c
@@ -0,0 +1,31 @@
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+
+int
+read9pmsg(int fd, void *abuf, uint n)
+{
+	int m, len;
+	uchar *buf;
+
+	buf = abuf;
+
+	/* read count */
+	m = readn(fd, buf, BIT32SZ);
+	if(m != BIT32SZ){
+		if(m < 0)
+			return -1;
+		return 0;
+	}
+
+	len = GBIT32(buf);
+	if(len <= BIT32SZ || len > n){
+		werrstr("bad length in 9P2000 message header");
+		return -1;
+	}
+	len -= BIT32SZ;
+	m = readn(fd, buf+BIT32SZ, len);
+	if(m < len)
+		return 0;
+	return BIT32SZ+m;
+}
-- 
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