From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/libc/9sys/read9pmsg.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100755 sys/src/libc/9sys/read9pmsg.c

(limited to 'sys/src/libc/9sys/read9pmsg.c')

diff --git a/sys/src/libc/9sys/read9pmsg.c b/sys/src/libc/9sys/read9pmsg.c
new file mode 100755
index 000000000..9e90ec5d6
--- /dev/null
+++ b/sys/src/libc/9sys/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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