[R-pkg-devel] Error handling in C code

[Jarrod Hadfield]

Hi,

Using Rf_error() rather than error() fixed the problem. Not sure why the problem was only flagged on Debian, but it seems to have been triggered by R_NO_REMAP being defined (which will be default in R 4.5.0).

Thanks for the help.

Jarrod

From: Simon Urbanek <simon.urbanek using R-project.org>
Date: Monday, 6 May 2024 at 03:38
To: Jarrod Hadfield <j.hadfield using ed.ac.uk>
Cc: r-package-devel using r-project.org <r-package-devel using r-project.org>
Subject: Re: [R-pkg-devel] Error handling in C code
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Jarrod,

could you point us to the code? There is not much to go by based on your email. One thing just in general: it's always safer to not re-map function names, especially since "error" can be defined in many random other headers, so it's better to use Rf_error() instead to avoid confusions with 3rd party headers that may (re-)define the "error" macro (depending on the order you include them in).

Cheers,
Simon


> On 4/05/2024, at 3:17 AM, Jarrod Hadfield <j.hadfield using ed.ac.uk> wrote:
>
> Hi,
>
> I have an R library with C code in it. It has failed the CRAN checks for Debian.  The problem is with the error function being undefined. Section 6.2 of the Writing R extensions (see below) suggests error handling can be handled by error and the appropriate header file is included in R.h, but this seems not to be the case?
>
> Any help would be appreciated!
>
> Thanks,
>
> Jarrod
>
> 6.2 Error signaling
>
> The basic error signaling routines are the equivalents of stop and warning in R code, and use the same interface.
>
> void error(const char * format, ...);
> void warning(const char * format, ...);
> void errorcall(SEXP call, const char * format, ...);
> void warningcall(SEXP call, const char * format, ...);
> void warningcall_immediate(SEXP call, const char * format, ...);
>
> These have the same call sequences as calls to printf, but in the simplest case can be called with a single character string argument giving the error message. (Don�t do this if the string contains �%� or might otherwise be interpreted as a format.)
>
> These are defined in header R_ext/Error.h included by R.h.
> The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th� ann an Oilthigh Dh�n �ideann, cl�raichte an Alba, �ireamh cl�raidh SC005336.
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