Re: setlocale() bugs

[Ingo Schwarze]

Hi,

Stefan answered this completely, except for one minor detail
which i'm adding:

Stefan Sperling wrote on Mon, Mar 19, 2018 at 12:16:20PM +0100:

> Invalid input can only occur in the first argument:
>   setlocale(0xdeadbeef, NULL) returned 'NULL'

Not true.  In addition to that, the CHARSET (i.e. the part after
the last dot if any) is also checked for validity - ".UTG-8" is
valid, any other suffix is invalid and causes NULL to be returned.

Besides, setlocale(3) can return NULL in case of ENOMEM.

Yours,
  Ingo


 $ make setlocale
cc -O2 -pipe    -o setlocale setlocale.c 
 $ LC_CTYPE=en_US.UTF-8 ./setlocale 
en_US.UTF-8
 $ LC_CTYPE=en_US.UTF-9 ./setlocale 
setlocale: setlocale failed
 $ cat setlocale.c                                            
#include <err.h>
#include <locale.h>
#include <stdio.h>

int
main(void)
{
        char *retval;

        retval = setlocale(LC_CTYPE, "");
        if (retval == NULL)
                errx(1, "setlocale failed");
        puts(retval);
        return 0;
}