diff --git a/src/libbio/brdstr.c b/src/libbio/brdstr.c
new file mode 100644
index 0000000..0398ab0
--- /dev/null
+++ b/src/libbio/brdstr.c
@@ -0,0 +1,60 @@
+/*
+	Copyright © 2009 The Go Authors.  All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include	<u.h>
+#include	<libc.h>
+#include	<bio.h>
+
+char*
+Brdstr(Biobuf *bp, int delim, int nulldelim)
+{
+	char *p, *q, *nq;
+	int n, linelen;
+
+	q = nil;
+	n = 0;
+	for(;;) {
+		p = Brdline(bp, delim);
+		linelen = Blinelen(bp);
+		if(n == 0 && linelen == 0)
+			return nil;
+		nq = realloc(q, n+linelen+1);
+		if(nq == nil) {
+			free(q);
+			return nil;
+		}
+		q = nq;
+		if(p != nil) {
+			memmove(q+n, p, linelen);
+			n += linelen;
+			if(nulldelim)
+				q[n-1] = '\0';
+			break;
+		}
+		if(linelen == 0)
+			break;
+		Bread(bp, q+n, linelen);
+		n += linelen;
+	}
+	q[n] = '\0';
+	return q;
+}