Re: [PATCH 2/2] Allow check-mark to be changed for CLI

[Pedro Alves <pedro@palves.net>]

On 2025-06-25 16:43, Tom Tromey wrote:
> Pedro> So maybe all we need is to base the "current" column's width
> Pedro> depend on the wcwidth of the character used.
> 
> I think to do this we'd need something better than wcwidth.  See
> appended.  Also as Eli points out, the terminal itself can do something
> other than whatever wcwidth reports.
> 
> Tom
> 
> #define _XOPEN_SOURCE
> #include <wchar.h>
> #include <stdio.h>
> 
> #define C L"👉"
> 
> int main() {
>   printf ("width = %d\n", wcswidth (C, wcslen (C)));
>   printf ("of char = %d\n", wcwidth (C[0]));
>   return 0;
> }
> 
> bapiya. gcc -o q q.c
> bapiya. ./q
> width = -1
> of char = -1
> 

That seems to be something with the locale.  Yours returns -1 for me too, but the below returns 2:

#define _XOPEN_SOURCE
#include <wchar.h>
#include <stdio.h>
#include <locale.h>

#define C L"👉"

int main()
{
  setlocale (LC_CTYPE, "");
  printf ("width = %d\n", wcswidth (C, wcslen (C)));
  printf ("of char = %d\n", wcwidth (C[0]));
  return 0;
}

$ gcc wcwidth.c -o wcwidth 
$ ./wcwidth 
width = 2
of char = 2