From: Willy Tarreau <w@1wt.eu>
Date: Fri, 2 Mar 2012 09:38:01 +0000 (+0100)
Subject: MINOR: buffers: provide simple pointer normalization functions
X-Git-Tag: v1.5-dev9~92
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7fd758bbcf7c9589e725fcaf032cf276c3242b61;p=thirdparty%2Fhaproxy.git

MINOR: buffers: provide simple pointer normalization functions

Add buffer_wrap_sub() and buffer_wrap_add() to normalize buffer pointers
after an addition or subtract.
---

diff --git a/include/proto/buffers.h b/include/proto/buffers.h
index bb2dd45ee4..ec8eaab2ba 100644
--- a/include/proto/buffers.h
+++ b/include/proto/buffers.h
@@ -87,6 +87,22 @@ static inline int buffer_empty(const struct buffer *buf)
 	return !buffer_not_empty(buf);
 }
 
+/* Normalizes a pointer after a subtract */
+static inline char *buffer_wrap_sub(const struct buffer *buf, char *ptr)
+{
+	if (ptr < buf->data)
+		ptr += buf->size;
+	return ptr;
+}
+
+/* Normalizes a pointer after an addition */
+static inline char *buffer_wrap_add(const struct buffer *buf, char *ptr)
+{
+	if (ptr - buf->size >= buf->data)
+		ptr -= buf->size;
+	return ptr;
+}
+
 /* Return the number of reserved bytes in the buffer, which ensures that once
  * all pending data are forwarded, the buffer still has global.tune.maxrewrite
  * bytes free. The result is between 0 and global.maxrewrite, which is itself