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devel / comp.arch.embedded / Re: addon functions

SubjectAuthor
* addon functionsHul Tytus
+- Re: addon functionsHans-Bernhard Bröker
+* Re: addon functionsGrant Edwards
|`- Re: addon functionsHul Tytus
`- Re: addon functionsDavid Brown

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addon functions

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From: ht...@panix.com (Hul Tytus)
Newsgroups: comp.arch.embedded
Subject: addon functions
Date: Tue, 1 Aug 2023 21:21:44 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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 by: Hul Tytus - Tue, 1 Aug 2023 21:21 UTC

Lewin Edwards in his dosfs file system uses the ldiv() functions shown below:
sector = ldiv(offset, SECTOR_SIZE).quot and
offset = ldiv(offset, SECTOR_SIZE).rem
Anybody know how this is declared or, maybe, defined?

Hul

Re: addon functions

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From: HBBroe...@t-online.de (Hans-Bernhard Bröker)
Newsgroups: comp.arch.embedded
Subject: Re: addon functions
Date: Tue, 1 Aug 2023 23:44:35 +0200
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 by: Hans-Bernhard Bröke - Tue, 1 Aug 2023 21:44 UTC

Am 01.08.2023 um 23:21 schrieb Hul Tytus:
> Lewin Edwards in his dosfs file system uses the ldiv() functions shown below:
> sector = ldiv(offset, SECTOR_SIZE).quot and
> offset = ldiv(offset, SECTOR_SIZE).rem
> Anybody know how this is declared or, maybe, defined?

Seriously? Does every C compiler you use come without a manual?

How else could you possibly find it hard to discover the declaration and
semantics of a 33+ years old C standard library function like that?

Re: addon functions

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From: inva...@invalid.invalid (Grant Edwards)
Newsgroups: comp.arch.embedded
Subject: Re: addon functions
Date: Tue, 1 Aug 2023 22:26:58 -0000 (UTC)
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 by: Grant Edwards - Tue, 1 Aug 2023 22:26 UTC

On 2023-08-01, Hul Tytus <ht@panix.com> wrote:
> Lewin Edwards in his dosfs file system uses the ldiv() functions shown below:
> sector = ldiv(offset, SECTOR_SIZE).quot and
> offset = ldiv(offset, SECTOR_SIZE).rem
> Anybody know how this is declared or, maybe, defined?

$ man ldiv

------------------------------------------------------------------------------
div(3) Library Functions Manual div(3)

NAME
div, ldiv, lldiv, imaxdiv - compute quotient and remainder of an inte‐
ger division

LIBRARY
Standard C library (libc, -lc)

SYNOPSIS
#include <stdlib.h>

div_t div(int numerator, int denominator);
ldiv_t ldiv(long numerator, long denominator);
lldiv_t lldiv(long long numerator, long long denominator);

#include <inttypes.h>

imaxdiv_t imaxdiv(intmax_t numerator, intmax_t denominator);

[...]

Re: addon functions

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From: david.br...@hesbynett.no (David Brown)
Newsgroups: comp.arch.embedded
Subject: Re: addon functions
Date: Wed, 2 Aug 2023 18:38:08 +0200
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 by: David Brown - Wed, 2 Aug 2023 16:38 UTC

On 01/08/2023 23:21, Hul Tytus wrote:
> Lewin Edwards in his dosfs file system uses the ldiv() functions shown below:
> sector = ldiv(offset, SECTOR_SIZE).quot and
> offset = ldiv(offset, SECTOR_SIZE).rem
> Anybody know how this is declared or, maybe, defined?
>
> Hul
>

It's a standard C library function. You can see its definition in the C
standards (draft versions of all modern C standards are freely available
online). A good reference for C is the "cppreference" site, with the
exact page here being:

<https://en.cppreference.com/w/c/numeric/math/div>

The "div" functions are almost never used these days - any decent
compiler will do as good or better when the code is expressed simply as:

sector = offset / SECTOR_SIZE;
offset = offset % SECTOR_SIZE;

But the "div" functions made sense with older and poorer compilers.

Re: addon functions

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From: ht...@panix.com (Hul Tytus)
Newsgroups: comp.arch.embedded
Subject: Re: addon functions
Date: Thu, 3 Aug 2023 16:52:09 -0000 (UTC)
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 by: Hul Tytus - Thu, 3 Aug 2023 16:52 UTC

Thanks Grant. I'd never seen those before and assumed they were Lewin's creation.

Hul

Grant Edwards <invalid@invalid.invalid> wrote:
> On 2023-08-01, Hul Tytus <ht@panix.com> wrote:
> > Lewin Edwards in his dosfs file system uses the ldiv() functions shown below:
> > sector = ldiv(offset, SECTOR_SIZE).quot and
> > offset = ldiv(offset, SECTOR_SIZE).rem
> > Anybody know how this is declared or, maybe, defined?

> $ man ldiv

> ------------------------------------------------------------------------------
> div(3) Library Functions Manual div(3)

> NAME
> div, ldiv, lldiv, imaxdiv - compute quotient and remainder of an inte???
> ger division

> LIBRARY
> Standard C library (libc, -lc)

> SYNOPSIS
> #include <stdlib.h>

> div_t div(int numerator, int denominator);
> ldiv_t ldiv(long numerator, long denominator);
> lldiv_t lldiv(long long numerator, long long denominator);

> #include <inttypes.h>

> imaxdiv_t imaxdiv(intmax_t numerator, intmax_t denominator);

> [...]

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