[Libguestfs] [PATCH v3 3/4] common: Add isaligned helper module

[Nir Soffer]

On Sun, Aug 19, 2018 at 2:39 PM Richard W.M. Jones <rjones at redhat.com>
wrote:

> On Sun, Aug 19, 2018 at 01:13:07AM +0300, Nir Soffer wrote:
> > is_aligned (size, align) returns true if size is aligned to align,
> > assuming that align is power of 2.
> >
> > Suggested by Eric Blake in
> > https://www.redhat.com/archives/libguestfs/2018-August/msg00036.html
> > ---
> >  common/include/isaligned.h | 51 ++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 51 insertions(+)
> >  create mode 100644 common/include/isaligned.h
> >
> > diff --git a/common/include/isaligned.h b/common/include/isaligned.h
>
> You have to add this file to common/include/Makefile.am otherwise
> it will never be distributed.
>

Right, missed this, will be in v4.


>
> Rich.
>
> > new file mode 100644
> > index 0000000..e693820
> > --- /dev/null
> > +++ b/common/include/isaligned.h
> > @@ -0,0 +1,51 @@
> > +/* nbdkit
> > + * Copyright (C) 2018 Red Hat Inc.
> > + * All rights reserved.
> > + *
> > + * Redistribution and use in source and binary forms, with or without
> > + * modification, are permitted provided that the following conditions
> are
> > + * met:
> > + *
> > + * * Redistributions of source code must retain the above copyright
> > + * notice, this list of conditions and the following disclaimer.
> > + *
> > + * * Redistributions in binary form must reproduce the above copyright
> > + * notice, this list of conditions and the following disclaimer in the
> > + * documentation and/or other materials provided with the distribution.
> > + *
> > + * * Neither the name of Red Hat nor the names of its contributors may
> be
> > + * used to endorse or promote products derived from this software
> without
> > + * specific prior written permission.
> > + *
> > + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
> > + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
> > + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
> > + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
> > + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> > + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> > + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> > + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> > + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
> > + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> > + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> > + * SUCH DAMAGE.
> > + */
> > +
> > +#ifndef NBDKIT_ISALIGNED_H
> > +#define NBDKIT_ISALIGNED_H
> > +
> > +#include <assert.h>
> > +#include <stdbool.h>
> > +
> > +#include "ispowerof2.h"
> > +
> > +/* Return true if size is a multiple of align. align must be power of 2.
> > + */
> > +static inline bool
> > +is_aligned (unsigned int size, unsigned int align)
> > +{
> > +  assert (is_power_of_2 (align));
> > +  return !(size & (align - 1));
> > +}
> > +
> > +#endif /* NBDKIT_ISALIGNED_H */
> > --
> > 2.17.1
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> libguestfs lets you edit virtual machines.  Supports shell scripting,
> bindings from many languages.  http://libguestfs.org
>
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