From 37da2899f40661e3e9631e497da8dc59b971cbd0 Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 17:07:39 +0000
Subject: 20060303a

---
 libbio/bread.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 libbio/bread.c

(limited to 'libbio/bread.c')

diff --git a/libbio/bread.c b/libbio/bread.c
new file mode 100644
index 00000000..c92482ca
--- /dev/null
+++ b/libbio/bread.c
@@ -0,0 +1,47 @@
+#include	"lib9.h"
+#include	<bio.h>
+
+long
+Bread(Biobuf *bp, void *ap, long count)
+{
+	long c;
+	uchar *p;
+	int i, n, ic;
+
+	p = ap;
+	c = count;
+	ic = bp->icount;
+
+	while(c > 0) {
+		n = -ic;
+		if(n > c)
+			n = c;
+		if(n == 0) {
+			if(bp->state != Bractive)
+				break;
+			i = read(bp->fid, bp->bbuf, bp->bsize);
+			if(i <= 0) {
+				bp->state = Bracteof;
+				if(i < 0)
+					bp->state = Binactive;
+				break;
+			}
+			bp->gbuf = bp->bbuf;
+			bp->offset += i;
+			if(i < bp->bsize) {
+				memmove(bp->ebuf-i, bp->bbuf, i);
+				bp->gbuf = bp->ebuf-i;
+			}
+			ic = -i;
+			continue;
+		}
+		memmove(p, bp->ebuf+ic, n);
+		c -= n;
+		ic += n;
+		p += n;
+	}
+	bp->icount = ic;
+	if(count == c && bp->state == Binactive)
+		return -1;
+	return count-c;
+}
-- 
cgit v1.2.3