From c0c9a9927f413e70f59158a10c460b1927985f44 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@centraldogma>
Date: Thu, 6 Oct 2011 00:39:05 +0200
Subject: libbio: add Breadn

---
 sys/src/libbio/breadn.c | 26 ++++++++++++++++++++++++++
 sys/src/libbio/mkfile   |  1 +
 2 files changed, 27 insertions(+)
 create mode 100644 sys/src/libbio/breadn.c

(limited to 'sys/src')

diff --git a/sys/src/libbio/breadn.c b/sys/src/libbio/breadn.c
new file mode 100644
index 000000000..fa335873f
--- /dev/null
+++ b/sys/src/libbio/breadn.c
@@ -0,0 +1,26 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+long
+Breadn(Biobufhdr *bp, void *data, long len)
+{
+	char *e, *p;
+	int n;
+
+	p = data;
+	e = p + len;
+	if(e < p){
+		Berror(bp, "invalid read length");
+		return -1;
+	}
+	while(p < e){
+		if((n = Bread(bp, p, e - p)) <= 0){
+			if(n < 0 && p == data)
+				return -1;
+			break;
+		}
+		p += n;
+	}
+	return p - (char*)data;
+}
diff --git a/sys/src/libbio/mkfile b/sys/src/libbio/mkfile
index 3b40fd25c..cae6e4850 100644
--- a/sys/src/libbio/mkfile
+++ b/sys/src/libbio/mkfile
@@ -17,6 +17,7 @@ OFILES=\
 	brdline.$O\
 	brdstr.$O\
 	bread.$O\
+	breadn.$O\
 	bseek.$O\
 	bwrite.$O\
 	bvprint.$O\
-- 
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