Re: Gnat 3.13p: Command_Name RM A.15

[Christoph Grein <christoph.grein@eurocopter.de>]

Robert Dewar wrote:

> > Open the file with the name given by Command_Name, call the
> > Name function which
> > by A8.2(22) must return the full name, then close the file
> again:
> 
> This obviously does NOT work if the file is not in the current
> directory, which for an executable file is likely. Writing a
> program that only works if its executable is in the current
> directory is defintely very bad practice, so this "solution"
> cannot be recommended.

OK, I'm talking of Win98/NT only,where it works also for relative paths.

Call My_Executable, which is on drive C: at the relative path ..\X\
from drive E directory A:

E:\A> C:..\X\My_Executable

On Win98, Command_Name returns  C:\Full_Path\X\My_Executable.exe
on WinNT, it returns C:..\X\My_Executable

Open works with both strings (OK I have to first add the extension .exe if not 
present, and I know it must be .exe and nothing else), and Name returns the 
desired result: C:\Full_Path\X\My_Executable.exe

> There is no general way of getting the full path of the
> current executable if it is not availabel in arg(0), which
> is why this cannot be guaranteed.

I did not claim that this works on all conceivable OSs.

Christoph Grein