From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Thu, 27 Mar 2003 17:02:43 +0000 (+0000)
Subject: added comedi_get_buffer_offset() to kcomedilib
X-Git-Tag: r0_7_67x~55
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=4a776de504184fdbd3e2b1bca8129f2d1f7f50ac;p=comedi.git

added comedi_get_buffer_offset() to kcomedilib
---

diff --git a/comedi/kcomedilib/get.c b/comedi/kcomedilib/get.c
index 5a2aed51..3146b5b2 100644
--- a/comedi/kcomedilib/get.c
+++ b/comedi/kcomedilib/get.c
@@ -187,7 +187,7 @@ int comedi_get_buffer_contents( comedi_t *d, unsigned int subdevice )
 	comedi_subdevice *s = dev->subdevices + subdevice;
 	comedi_async *async;
 
-	if( subdevice > dev->n_subdevices ) return -1;
+	if( subdevice >= dev->n_subdevices ) return -1;
 	async = s->async;
 	if(async == NULL) return 0;
 
@@ -221,7 +221,7 @@ int comedi_mark_buffer_read( comedi_t *d, unsigned int subdevice,
 	comedi_subdevice *s = dev->subdevices + subdevice;
 	comedi_async *async;
 
-	if( subdevice > dev->n_subdevices ) return -1;
+	if( subdevice >= dev->n_subdevices ) return -1;
 	async = s->async;
 	if( async == NULL ) return -1;
 
@@ -244,3 +244,15 @@ int comedi_get_buffer_size(comedi_t *d,unsigned int subdev)
 	return async->prealloc_bufsz;
 }
 
+int comedi_get_buffer_offset( comedi_t *d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *)d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+
+	if( subdevice >= dev->n_subdevices ) return -1;
+	async = s->async;
+	if(async == NULL) return 0;
+
+	return async->buf_read_ptr;
+}
diff --git a/comedi/kcomedilib/ksyms.c b/comedi/kcomedilib/ksyms.c
index 9ce57014..fcbc783e 100644
--- a/comedi/kcomedilib/ksyms.c
+++ b/comedi/kcomedilib/ksyms.c
@@ -90,6 +90,7 @@ EXPORT_SYMBOL(comedi_get_buffer_size);
 //EXPORT_SYMBOL(comedi_get_max_buffer_size);
 //EXPORT_SYMBOL(comedi_set_buffer_size);
 EXPORT_SYMBOL(comedi_get_buffer_contents);
+EXPORT_SYMBOL(comedi_get_buffer_offset);
 
 /* low-level stuff */
 //EXPORT_SYMBOL(comedi_trigger);
diff --git a/include/linux/comedilib.h b/include/linux/comedilib.h
index 8cc52e65..7b07eedf 100644
--- a/include/linux/comedilib.h
+++ b/include/linux/comedilib.h
@@ -118,7 +118,7 @@ int comedi_get_buffer_size(comedi_t *dev,unsigned int subdev);
 int comedi_mark_buffer_read( comedi_t *dev, unsigned int subdevice,
 	unsigned int num_bytes );
 int comedi_get_buffer_contents( comedi_t *dev, unsigned int subdevice );
-
+int comedi_get_buffer_offset( comedi_t *dev, unsigned int subdevice );
 
 
 #else