• Luís Marques (7/7) Apr 03 2006 The grammar for the lexical analysis contains:
• pragma (10/17) Apr 03 2006 0x1A (or CTRL-Z or ASCII 26) is a holdover from CP/M, which Windows inhe...
• Luís Marques (12/20) Apr 03 2006 That's very interesting. I use CTRL-Z in several console programs but I ...
• BCS (3/33) Apr 03 2006 IIRC CTRL-[x] ends up, in ASCII, masking out a single bit from [x], I th...
• Regan Heath (13/44) Apr 03 2006 I think you're correct. If you look at an ASCII character table, find th...
• Walter Bright (4/13) Apr 03 2006 Some text editors mark the end of the text with a 0x1A (control Z)

"Luís Marques" <luismarques+spam gmail.com> writes:

The grammar for the lexical analysis contains:

EndOfFile:
physical end of the file
\u0000
\u001A

I don't understand, what's a \u001A? Substitution? How does that work?
Wouldn't you want something like \u0019, end of medium?

pragma <pragma_member pathlink.com> writes:

In article <e0s3ct$1pk6$1 digitaldaemon.com>, Luís Marques says...
The grammar for the lexical analysis contains:

EndOfFile:
physical end of the file
\u0000
\u001A

I don't understand, what's a \u001A? Substitution? How does that work?
Wouldn't you want something like \u0019, end of medium?

0x1A (or CTRL-Z or ASCII 26) is a holdover from CP/M, which Windows inherited
via DOS:

http://blogs.msdn.com/oldnewthing/archive/2004/03/16/90448.aspx

The 'copy' command that the article mentions works something like this:

c:\> copy con > foobar.txt

This will copy every keypress to the text file until you press CTRL-Z.  Its
actually pretty handy if you're repairing a system with a paperclip, a battery
and some duct-tape.

- EricAnderton at yahoo

"Luís Marques" <luismarques+spam gmail.com> writes:

In article <e0s5nm$1rpr$1 digitaldaemon.com>, pragma says...
0x1A (or CTRL-Z or ASCII 26) is a holdover from CP/M, which Windows inherited
via DOS:

http://blogs.msdn.com/oldnewthing/archive/2004/03/16/90448.aspx

The 'copy' command that the article mentions works something like this:

c:\> copy con > foobar.txt

This will copy every keypress to the text file until you press CTRL-Z.  Its
actually pretty handy if you're repairing a system with a paperclip, a battery
and some duct-tape.

That's very interesting. I use CTRL-Z in several console programs but I didn't
know programs read that 
as \u001A nor from where that convention came.

I still don't really grok the relationship between CTRL-[X] codes and
ASCII/Unicode, on unix and 
windows, but I guess that's another story.

Which also makes me wonder, if it wasn't a type afterall, what's the purpose of
characters like \u0019. 
The sites listing Unicode characters don't generally have much semantic
information on them.

Luís

BCS <BCS_member pathlink.com> writes:

Luís Marques wrote:
 In article <e0s5nm$1rpr$1 digitaldaemon.com>, pragma says...
 
0x1A (or CTRL-Z or ASCII 26) is a holdover from CP/M, which Windows inherited
via DOS:

http://blogs.msdn.com/oldnewthing/archive/2004/03/16/90448.aspx

The 'copy' command that the article mentions works something like this:

c:\> copy con > foobar.txt

This will copy every keypress to the text file until you press CTRL-Z.  Its
actually pretty handy if you're repairing a system with a paperclip, a battery
and some duct-tape.

 
 
 That's very interesting. I use CTRL-Z in several console programs but I didn't
 know programs read that 
 as \u001A nor from where that convention came.
 
 I still don't really grok the relationship between CTRL-[X] codes and
 ASCII/Unicode, on unix and 
 windows, but I guess that's another story.
 
 Which also makes me wonder, if it wasn't a type afterall, what's the purpose of
 characters like \u0019. 
 The sites listing Unicode characters don't generally have much semantic
 information on them.
 
 Luís


IIRC CTRL-[x] ends up, in ASCII, masking out a single bit from [x], I think it 
is the 64s place but I may be wrong.

"Regan Heath" <regan netwin.co.nz> writes:

On Mon, 03 Apr 2006 16:11:04 -0700, BCS <BCS_member pathlink.com> wrote:
 Luís Marques wrote:
 In article <e0s5nm$1rpr$1 digitaldaemon.com>, pragma says...

 0x1A (or CTRL-Z or ASCII 26) is a holdover from CP/M, which Windows  
 inherited
 via DOS:

 http://blogs.msdn.com/oldnewthing/archive/2004/03/16/90448.aspx

 The 'copy' command that the article mentions works something like this:

 c:\> copy con > foobar.txt

 This will copy every keypress to the text file until you press  
 CTRL-Z.  Its
 actually pretty handy if you're repairing a system with a paperclip, a  
 battery
 and some duct-tape.

   That's very interesting. I use CTRL-Z in several console programs but  
 I didn't
 know programs read that as \u001A nor from where that convention came.
  I still don't really grok the relationship between CTRL-[X] codes and
 ASCII/Unicode, on unix and windows, but I guess that's another story.
  Which also makes me wonder, if it wasn't a type afterall, what's the  
 purpose of
 characters like \u0019. The sites listing Unicode characters don't  
 generally have much semantic
 information on them.
  Luís


 IIRC CTRL-[x] ends up, in ASCII, masking out a single bit from [x], I  
 think it is the 64s place but I may be wrong.

I think you're correct. If you look at an ASCII character table, find the  
  character, you'll notice that following it in sequence are the capital A  
thru Z characters, then [ \ ] ^ _

CTRL+[X] where [X] is one of those characters results in the value of that  
character with the 64s place masked, eg.

  == 0x40, CTRL+  == 0x00
A == 0x41, CTRL+A == 0x01
..
Z == 0x5A, CTRL+Z == 0x1A
..
_ == 0x5F, CTRL+_ == 0x1F

Regan

Walter Bright <newshound digitalmars.com> writes:

Luís Marques wrote:
 The grammar for the lexical analysis contains:
 
 EndOfFile:
 physical end of the file
 \u0000
 \u001A
 
 I don't understand, what's a \u001A? Substitution? How does that work?
 Wouldn't you want something like \u0019, end of medium?

Some text editors mark the end of the text with a 0x1A (control Z) 
character. It's a holdover from the DOS days when files got padded out 
to the next sector boundary.