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forgot to add buffer.c file containing definitions for new functions

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This commit is contained in:
Frank Mori Hess 2001-04-08 18:02:20 +00:00
parent fc62ecb25e
commit dc518f11e7
1 changed files with 64 additions and 0 deletions
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64
lib/buffer.c Normal file
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#include <comedi.h>
#include <libinternal.h>
int comedi_buf_resize(comedi_t *it, unsigned int subdev, unsigned int size)
{
int ret;
comedi_bufconfig bc;
memset(&bc, 0, sizeof(bc));
bc.subdevice = subdev;
bc.size = size;
ret = ioctl_bufconfig(it->fd, &bc);
if(ret < 0) return ret;
return bc.size;
}
int comedi_buf_resize_max(comedi_t *it, unsigned int subdev, unsigned int max_size)
{
int ret;
comedi_bufconfig bc;
memset(&bc, 0, sizeof(bc));
bc.subdevice = subdev;
bc.maximum_size = max_size;
ret = ioctl_bufconfig(it->fd, &bc);
if(ret < 0) return ret;
return bc.maximum_size;
}
int comedi_buf_size(comedi_t *it, unsigned int subdev)
{
return comedi_buf_resize(it, subdev, 0);
}
int comedi_buf_contents(comedi_t *it, unsigned int subdev)
{
return comedi_buf_mark_read(it, subdev, 0);
}
int comedi_buf_mark_read(comedi_t *it, unsigned int subdev, unsigned int bytes)
{
int ret;
comedi_bufinfo bi;
memset(&bi, 0, sizeof(bi));
bi.bytes_read = bytes;
ret = ioctl_bufinfo(it->fd, &bi);
if(ret < 0) return ret;
return bi.buf_int_count - bi.buf_user_count;
}
int comedi_buf_offset(comedi_t *it, unsigned int subdev)
{
int ret;
comedi_bufinfo bi;
memset(&bi, 0, sizeof(bi));
ret = ioctl_bufinfo(it->fd, &bi);
if(ret < 0) return ret;
return bi.buf_user_ptr;
}