1. If a segment is deleted from an ansistring, e.g. ...

s := 'abcdefghijklmnop';
delete (s, 5, 6);

yielding s = 'abcdelmnop'

...does the system "shift" the 'lmnop' to the left, or does the string get hooked together with pointers, thus saving much time with long strings?

2. Is there any documentation yet of the ansistring internals? If not, what file contains the source?

Thanks,
Mark

It is shifted. Hooked together would maybe make 'delete' faster, but would considerably slow down other operations.

But the memory is not reallocated in this case, unless the string had a reference count of 2.

And the shift is done using a 'Move' instruction, which is highly optimized.

2. Is there any documentation yet of the ansistring internals? If not, what file contains the source?

The memory layout is documented in the programmer's guide:

Memory Issues
+ Data Formats
+ String types
+ Ansistring types

The source is rtl/inc/astrings.inc

Michael.

No shifting, ansistrings are not sparse (at least not in this implementation.

Note that sparse strings save time with this kind of operations, but cost quite some extra time when parsing them.

2. Is there any documentation yet of the ansistring internals? If not, what file contains the source?

I don't know, but the file is inc/astrings.inc Maybe there are some asm parts in <processor>.inc too

The idea is quite simple. Ansistrings essentially are pchars, with alloocation size, length and reference count prefixed on negative offsets of variable^.

The fact that it has the length, also means that it can contain any character.

The F_SETLK constant is set at 6 on BSD systems... while 6 is correct for Linux systems, F_SETLK is 8 on BSD systems... I assume this means that F_SETOWN etc. are wrote too for fcntl constants on BSD systems.

Just to let you know. :-)

should be:

It does shifting, but isn't sparse.

The www.lazarus.freepascal.org has been down for a while, does anyone know what exactly what happened?

[]'s
Renato

Thanks for answering.

I am finishing downloading it, but I have some time to wait yet (56k and only a few hours per weekend). How is the project going?

[]'s
Renato Borges A. Prado
VW Gol Power 1.0 16V 02/02
Poá-SP

Renato Borges A. Prado wrote

The www.lazarus.freepascal.org has been down for a while, does anyone know what exactly what happened?

A hacker attacked it. Michael Hess is working on it.

Michael.

The www.lazarus.freepascal.org has been down for a while, does anyone know what exactly what happened?

Some hacker activity, and the owner wanted to reinstall to make sure that they were entirely gone.

He took the oppurtunity to add new hardware, and that all took more time then expected. Probably it will be up again later this week(end?)

That's so pathetic. What'd the hacker do anyhow ? And how the heck does a hacker break into a *nix box ? (I assume it is...)

cheers
James

That's so pathetic. What'd the hacker do anyhow ? And how the heck does a hacker break into a *nix box ? (I assume it is...)

It's easy. At least if you run an old redhat, or run some of the dangerous services.
I remember my machine been hacked into some year ago. The redhat of then just completely blew all my security measures and installed a service I didn't want or needed opening my machine wide up.
As to why. When it came to my machine I reckon it was used to either break into some other computer or as a DoS attack machine.

So, if you had the impression that a *nix box was hacker proof, then your wrong. You have to be on the alert all the time, running some sort of intrusion defense program, and be aware of what services you run, and possible security problem with them.

totally OT, but I just couldn't help myself.

Sigurd Stordal wrote

> That's so pathetic. What'd the hacker do anyhow ? And how the heck does > a hacker break into a *nix box ? (I assume it is...) It's easy. At least if you run an old redhat, or run some of the dangerous services.

You really need to be deligent and keep up with the security updates and apply them when a hole comes up. I was busy and lazy and didn't get around to one of them and that is how they got in. :-\

Not to be pedantic, but can I request that we as TRUE hackers at least get the terminology right. The site was a cracked by a cracker. FPC was created, and is used by a large number of hackers.

Maybe I should just give up........sigh.

Ciao
A.J.

It happens to the best of them...
http://linuxtoday.com/news_story.php3?ltsn=2000-05-05-009-04-PS http://www.internetnews.com/infra/article.php/2248811

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