[syslinux] port syslinux isohybrid perl script to C

[H. Peter Anvin]

On 04/13/2010 09:39 PM, P J P wrote:
>   Hi,
> 
> --- On Wed, 14/4/10, H. Peter Anvin <hpa at zytor.com> wrote:
>> fwrite(3) is the best option.  Also keep in mind that you might be on a
>> system of different native byte order.
> 
>   But, fwrite(3) is for writing data to the file. Whereas, the following block writes data to mbr buffer, which is then written to the file with write(2).
> 

For writing bytes to a buffer, just use simple assignment:

	mbr[0] = 0x80;
	mbr[1] = bhead;

... etc ...

Your use of write(2) is also incorrect; write(2) is interruptible and
should nearly always be used in a loop.  The easiest workaround is to
use fwrite(3), which contains said loop.

A lot of this is pretty elementary C...

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.