Re: Is there a standard way to write an 8 bit byte?
- From: "Malcolm" <regniztar@xxxxxxxxxxxxxx>
- Date: Mon, 2 May 2005 21:23:55 +0000 (UTC)
"Kristian Nybo" <kristian@xxxxxxxxxxxxxxxxxx> wrote
> I'm writing a simple image file exporter as part of a school project, and
> I would like to write completely platform-independent code if at all
> possible. The problem I've run into is that apparently there's no
> guarantee that a particular implementation will have a data type that is
> exactly 8 bits wide; char is only guaranteed to be at least 8 bits.
> Correct me if I'm wrong, but I assume that if CHAR_BIT happens to be, say,
> 9, writing a char into a file in binary mode would result in 9 bits being
> written.
>
Just use fgetc and fputc to write integers between 0 and 255.
There is no cast iron guarantee in the C standard that this will produce the
file you want, if say chars are 9 bits wide. However in practise there will
always be an easy way to convert such files so that they can be read by
8-bit machines (maybe by running them though a converter program)..
Computers exist in the real world and have to communicate with each other.
.
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