|  | printf | | |
| | | Jrdman |  |
|  Posted: Tue Sep 02, 2008 11:43 pm Post subject: printf |  |
| someone has an idea on how the printf function is programmed ? |
| |
| | | Ian Collins | |
| | Posted: Tue Sep 02, 2008 11:43 pm Post subject: Re: printf | |
Jrdman wrote:
| Quote: | someone has an idea on how the printf function is programmed ?
|
One would guess those who have implemented it!
Find the source for an implementation (there are many published) and
have a look.
--
Ian Collins. |
| |
| | | Martin Ambuhl | |
| | Posted: Tue Sep 02, 2008 11:43 pm Post subject: Re: printf | |
Jrdman wrote:
| Quote: | someone has an idea on how the printf function is programmed ?
|
Yes.
If you want to look at one method of implementation (at least for the
features in C90), check P.J. Plauger's _The Standard C Library_
(prentice Hall, 1992). An implementation of the functions declared in
<stdio.h> is all of chapter 12, pp. 225-332. I'm not sure what short
answer you expect when Plauger takes 106 pages for this. |
| |
| | | Pilcrow | |
| | Posted: Wed Sep 03, 2008 2:44 am Post subject: Re: printf | |
On Tue, 02 Sep 2008 20:42:47 -0400, Martin Ambuhl
<mambuhl@earthlink.net> wrote:
| Quote: | Jrdman wrote:
someone has an idea on how the printf function is programmed ?
Yes.
If you want to look at one method of implementation (at least for the
features in C90), check P.J. Plauger's _The Standard C Library_
(prentice Hall, 1992). An implementation of the functions declared in
stdio.h> is all of chapter 12, pp. 225-332. I'm not sure what short
answer you expect when Plauger takes 106 pages for this.
|
Thanks for the reference. |
| |
| | | Richard Heathfield | |
| | Posted: Wed Sep 03, 2008 4:15 am Post subject: Re: printf | |
raashid bhatt said:
| Quote: | On Sep 2, 7:43 pm, Jrdman <ahmed.bo...@gmail.com> wrote:
someone has an idea on how the printf function is programmed ?
unser windows itz a function call
|
It's a function call in *any* environment. And the rest of your answer is
unnecessarily platform-specific - the printf function can be written
portably.
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999 |
| |
| | | raashid bhatt | |
| | Posted: Wed Sep 03, 2008 5:04 am Post subject: Re: printf | |
On Sep 2, 7:43 pm, Jrdman <ahmed.bo...@gmail.com> wrote:
| Quote: | someone has an idea on how the printf function is programmed ?
|
unser windows itz a function call in msvcrt.dll which in turn calls
kerne32.dll GetStdouthandle(); and after getting the handle it calls
WriteFile() function of kernel32.dl |
| |
| | | Ron Ford | |
| | Posted: Wed Sep 03, 2008 5:10 am Post subject: Re: printf | |
On Wed, 03 Sep 2008 06:15:59 +0000, Richard Heathfield posted:
| Quote: | raashid bhatt said:
On Sep 2, 7:43 pm, Jrdman <ahmed.bo...@gmail.com> wrote:
someone has an idea on how the printf function is programmed ?
unser windows itz a function call
It's a function call in *any* environment. And the rest of your answer is
unnecessarily platform-specific - the printf function can be written
portably.
|
sprintf too?
Is sprintf variadic?
--
War will never cease until babies begin to come into the world with larger
cerebrums and smaller adrenal glands. 2
H. L. Mencken |
| |
| | | Richard Heathfield | |
| | Posted: Wed Sep 03, 2008 5:16 am Post subject: Re: printf | |
Ron Ford said:
| Quote: | On Wed, 03 Sep 2008 06:15:59 +0000, Richard Heathfield posted:
raashid bhatt said:
On Sep 2, 7:43 pm, Jrdman <ahmed.bo...@gmail.com> wrote:
someone has an idea on how the printf function is programmed ?
unser windows itz a function call
It's a function call in *any* environment. And the rest of your answer
is unnecessarily platform-specific - the printf function can be written
portably.
sprintf too?
|
Yes.
| Quote: | Is sprintf variadic?
|
Yes.
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999 |
| |
| | | Ron Ford | |
| | Posted: Wed Sep 03, 2008 5:33 am Post subject: Re: printf | |
| |  | |
On Wed, 03 Sep 2008 07:16:54 +0000, Richard Heathfield posted:
| Quote: | Ron Ford said:
On Wed, 03 Sep 2008 06:15:59 +0000, Richard Heathfield posted:
raashid bhatt said:
On Sep 2, 7:43 pm, Jrdman <ahmed.bo...@gmail.com> wrote:
someone has an idea on how the printf function is programmed ?
unser windows itz a function call
It's a function call in *any* environment. And the rest of your answer
is unnecessarily platform-specific - the printf function can be written
portably.
sprintf too?
Yes.
|
I see the syntax here in §7.2.
What I think a person might call this is an internal write. In fortran, we
go so far as to speak of "internal files," when what we really mean is the
character variable that we write to. I/O need not apply.
I'd be curious to see a useful snippet.
| Quote: |
Is sprintf variadic?
Yes.
|
This disqualifies it from fortran interop.
--
When a new source of taxation is found it never means, in practice, that
the old source is abandoned. It merely means that the politicians have two
ways of milking the taxpayer where they had one before. 8
H. L. Mencken |
| |
| | | Malcolm McLean | |
| | Posted: Wed Sep 03, 2008 6:05 pm Post subject: Re: printf | |
"Ron Ford" <ron@example.invalid> wrote in message
| Quote: |
[sprintf ]
I'd be curious to see a useful snippet.
sprintf() can be written portably. printf() cannot, though it can be written |
on top of putchar(), which has to be platform-specific.
An example use would be in BasicDraw. Microsoft have provided a function for
setting the window title which takes, reasonably enough, a char *. Since I
want the name of the program, the version, the name of the file it is
editing, and an asterisk to represent file dirty, I can write
sprintf(buff, "BasicDraw v%g [%s]%c", version, filename, dirty ? '*' : ' ');
setwindowtitle(win, buff);
without sprintf it would be awkward to build the title, or Microsoft would
have to complicate their title-setting function to accept variable
arguments.
--
Free games and programming goodies.
LINK |
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