definition of stdio.h

[lak]

if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

[Ian Collins]

lak wrote:

if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

Either in <stdio.hor a header included by <stdio.h>

--
Ian Collins.

[Richard Heathfield]

Ian Collins said:

lak wrote:

>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

Either in <stdio.hor a header included by <stdio.h>

Deeply unlikely. Only an idiot would define printf and scanf in a header.
Since you yourself are not an idiot, I think you must have misread his
requirement. He is after the function definitions, not the declarations.

--
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

[Ian Collins]

Richard Heathfield wrote:

Ian Collins said:

>lak wrote:

>>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

Either in <stdio.hor a header included by <stdio.h>

Deeply unlikely. Only an idiot would define printf and scanf in a header.
Since you yourself are not an idiot, I think you must have misread his
requirement. He is after the function definitions, not the declarations.

:)

A bit odd that the OP's <stdio.honly has symbolic constants.

--
Ian Collins.

[santosh]

lak wrote:

if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

It should be in <stdio.h>. However it might use so many compiler
extensions as to unrecognisable to a beginner or someone who only knows
ISO C. Also as Ian notes, it might be in another file included by
<stdio.h>.

Write a simple program using both printf and scanf and direct the
compiler to produce preprocessed output. If you examine this output
you'll find the declarations for printf and scanf somewhere.

[Richard Tobin]

In article <11************ **********@o80g 2000hse.googleg roups.com>,
lak <la********@gma il.comwrote:

>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

You want to look at the source code for the library, which may well
not be available on you system. If you're using Linux, BSD, or some
other free operating system you will be able to get hold of it,
otherwise you're probably out of luck.

You can find the FreeBSD implementation at

http://www.freebsd.org/cgi/cvsweb.cg...ib/libc/stdio/

(click on the red version numbers to see the code).

-- Richard

--
"Considerat ion shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

[santosh]

Richard Heathfield wrote:

Ian Collins said:

>lak wrote:

>>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

Either in <stdio.hor a header included by <stdio.h>

Deeply unlikely. Only an idiot would define printf and scanf in a
header. Since you yourself are not an idiot, I think you must have
misread his requirement. He is after the function definitions, not the
declarations.

Oops. I made the same mistake! Oh well.

[Richard Tobin]

In article <fe**********@a ioe.org>, santosh <sa*********@gm ail.comwrote:

>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

>If you examine this output
you'll find the declarations for printf and scanf somewhere.

I suspect he really wants the definitions, not the declarations.

-- Richard
--
"Considerat ion shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

[Keith Thompson]

Richard Heathfield <rj*@see.sig.in validwrites:

Ian Collins said:

>lak wrote:

>>if i view stdio.h there are only symbolic constants.
where is the definition of printf and scanf is available?
i want to see the definition of printf and scanf and where it is
stored?

Either in <stdio.hor a header included by <stdio.h>

Deeply unlikely. Only an idiot would define printf and scanf in a header.

printf and scanf could be defined as macros. (I *think* that C99's
variadic macros are up to the task.)

Since you yourself are not an idiot, I think you must have misread his
requirement. He is after the function definitions, not the declarations.

He asked for definitions, but I'm not convinced that that's really
what he's after (which is why I asked him for clarification
elsethread).

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Richard Tobin]

In article <ln************ @nuthaus.mib.or g>,
Keith Thompson <ks***@mib.orgw rote:

>whereas the definition is something like this:

int printf(const char * restrict format, ...)
{
/* lots and lots of code here */
}

Probably not "lots and lots", in this case. I suspect that most
implementations will look just like this one from FreeBSD:

int printf(char const * restrict fmt, ...)
{
int ret;
va_list ap;

va_start(ap, fmt);
ret = vfprintf(stdout , fmt, ap);
va_end(ap);
return (ret);
}

-- Richard
--
"Considerat ion shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.