1. open() a file in 2.5
- Posted by akusaya at gmx.net
Feb 13, 2005
I think this is not important.. but I am curious..
Why does the first open() in 2.5 return 4 instead of 3 ?
Thanks! :P
2. Re: open() a file in 2.5
> I think this is not important.. but I am curious..
>
> Why does the first open() in 2.5 return 4 instead of 3 ?
My guess is that Euphora uses a 1-based index, and C uses a 0-based
index. Since the front-end of Euphoria is written in Euphoria, this
causes most counts (file numbers, routine id's, etc...) to increase by
1.
~Greg
3. Re: open() a file in 2.5
On Sun, 13 Feb 2005 12:07:22 -0500, Greg Haberek <ghaberek at gmail.com>
wrote:
>
>> I think this is not important.. but I am curious..
>>
>> Why does the first open() in 2.5 return 4 instead of 3 ?
>
>My guess is that Euphora uses a 1-based index, and C uses a 0-based
>index. Since the front-end of Euphoria is written in Euphoria, this
>causes most counts (file numbers, routine id's, etc...) to increase by
>1.
>
Greg, to clarify:
0 is standard input,
1 is standard output, and
2 is standard error,
hence the first file you open (under 2.4) will get an id of 3.
Version 2.5 cannot have changed those meanings, otherwise getc(0),
printf(1,..) etc would all be broken.
My guess is that a minor bug has crept in: filetable[4] is never used.
I had a quick look at execute.e but it offers no hints, maybe this is
necessary for execute.e and execute.c to be interchangeable?
Regards,
Pete
4. Re: open() a file in 2.5
- Posted by Robert Craig <rds at RapidEuphoria.com>
Feb 13, 2005
-
Last edited Feb 14, 2005
unknown wrote:
> I think this is not important.. but I am curious..
>
> Why does the first open() in 2.5 return 4 instead of 3 ?
It does that in 2.5 alpha, not in 2.5 beta.
The 2.5 alpha front-end did not close the main Euphoria file
until after execution of the users program, so one extra file
was open. The front end is written in Euphoria,
so it uses the same file table as the users code. In 2.5 beta
the main file is closed prior to execution of the user's program.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
