memfrob and strfry ? OT

[Bill Cunningham]

My string.h headers declares two functions I have been using called
memfrob and strfry. They are encryption types functions. My man pages say
they are standard to linux c and gnu c. They sure aren't in my C books.
Interesting functions by they're OT here but this raises to me a question.
If a function returns a pointer to a void and and as it's first parameter a
pointer to a void. Then should that function's first parameter accept a
string or pointer to char or any other data type since the parameter is
declared a void * ?

Bill

[Default User]

Richard Tobin wrote:

In article <Kl2Zj.25383$sX 5.23589@trnddc0 2>,
Bill Cunningham <no****@nspam.c omwrote:

My string.h headers declares two functions I have been using
called memfrob and strfry.

Laugh? I almost did.

I had Hunan chicken for lunch. Oh wait, that's stir-fry.

Brian

[Joe Wright]

Default User wrote:

Richard Tobin wrote:

>In article <Kl2Zj.25383$sX 5.23589@trnddc0 2>,
Bill Cunningham <no****@nspam.c omwrote:

>> My string.h headers declares two functions I have been using
called memfrob and strfry.

Laugh? I almost did.

I had Hunan chicken for lunch. Oh wait, that's stir-fry.

Illegal. Can't use the hyphen here. Maybe stir_fry. :-)

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

[Antoninus Twink]

On 22 May 2008 at 3:35, Spiros Bousbouras wrote:

Of course on Linux a void * can hold even pointers to functions.

And more generally on POSIX. Actually, like so many things, this is
really Not A Problem in real life, but the clc regulars try to make it
into a problem so that they've got something to beef about.

[Bill Cunningham]

"Keith Thompson" <ks***@mib.orgw rote in message
news:ln******** ****@nuthaus.mi b.org...

Ok, you want to learn about void*.

My advice: Forget about memfrob(). It's non-standard, and it doesn't
do anything particularly useful. Take a look at the various standard
mem*() functions: memcpy, memmove, memcmp, memchr, memset. To start
learning about them, read a book.

Here's what I have learned. Sec 5.4 pg 103. "...except for void *, to
assign a pointer of one type to a pointerr of another type withou a
cast." --k and r 2

Bill

[Bill Cunningham]

"Spiros Bousbouras" <sp****@gmail.c omwrote in message
news:1467c554-96c0-48d3-8ee8-

Find some code which uses realloc() and study it.

That's the thing. I can't find any. I have about 64 bytes worth of
partition table data I can play with. According to what I've read this
function changes the size somehow.

Bill

[CBFalconer]

Bill Cunningham wrote:

"Spiros Bousbouras" <sp****@gmail.c omwrote:

>Find some code which uses realloc() and study it.

That's the thing. I can't find any. I have about 64 bytes worth
of partition table data I can play with. According to what I've
read this function changes the size somehow.

#include <stdio.h>
#include <stdlib.h>

int main(void) {
void *t, *p, *pp;
size_t sz;

p = malloc(1);
for (sz = 2; sz < 100; sz++) {
pp = p;
if (t = realloc(p, sz)) p = t;
else {
printf("realloc failed at sz = %lu\n", (unsigned long)sz);
break;
}
printf("p was %p, is %p at sz = %lu\n",
pp, p, (unsigned long)sz);
}
return 0;
}

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
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[Harald van =?UTF-8?b?RMSzaw==?=]

On Thu, 22 May 2008 21:51:35 +0000, Antoninus Twink wrote:

On 22 May 2008 at 3:35, Spiros Bousbouras wrote:

>Of course on Linux a void * can hold even pointers to functions.

And more generally on POSIX.

Wrong.

[Antoninus Twink]

On 23 May 2008 at 16:47, Harald van Dijk wrote:

On Thu, 22 May 2008 21:51:35 +0000, Antoninus Twink wrote:

>On 22 May 2008 at 3:35, Spiros Bousbouras wrote:

>>Of course on Linux a void * can hold even pointers to functions.

And more generally on POSIX.

Wrong.

In that case, what do you do with the void * returned by dlsym()? Put it
on a shelf and admire its object-pointer-ness?

[Keith Thompson]

Harald van Dijk <tr*****@gmail. comwrites:

On Thu, 22 May 2008 21:51:35 +0000, Antoninus Twink wrote:

>On 22 May 2008 at 3:35, Spiros Bousbouras wrote:

>>Of course on Linux a void * can hold even pointers to functions.

And more generally on POSIX.

Wrong.

<OT>
See <http://www.opengroup.o rg/onlinepubs/009695399/functions/dlsym.html>,
particularly the rationale section.
</OT>

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

[Kenny McCormack]

In article <sl************ *******@nospam. invalid>,
Antoninus Twink <no****@nospam. invalidwrote:

>On 23 May 2008 at 16:47, Harald van Dijk wrote:

>On Thu, 22 May 2008 21:51:35 +0000, Antoninus Twink wrote:

>>On 22 May 2008 at 3:35, Spiros Bousbouras wrote:
Of course on Linux a void * can hold even pointers to functions.

And more generally on POSIX.

Wrong.

In that case, what do you do with the void * returned by dlsym()? Put it
on a shelf and admire its object-pointer-ness?

Is dlsym() POSIX?

I would assume that that is the picky point being made. And I would
assume that the answer is "no", FSVO "POSIX".

Probably some early draft release...