On 24/07/2023 08:21, And wrote:
>
> 
> No, I don't use Linux. I'm writing a macro, it input a file_name string. If
> (file_name = ""), it will not output that file.
> 

I'm not sure I understand the need, but if you want to test whether the
file name is empty, you can use the strlen() function.

#if(strlen(file_name))
  // file name is defined
  ...
#else
  // file name is empty
  ...
#end



-- 
Kurtz le pirate
Compagnie de la Banquise

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