Re: quotearg.c's shell_quoting_style and MinGW

> From: Bruno Haible <[email protected]>
> Cc: [email protected]
> Date: Sat, 05 May 2012 20:08:45 +0200
> 
> Eli Zaretskii wrote:
> > When quoting a shell command argument (using shell_quoting_style or
> > shell_always_quoting_style), quotearg.c uses the '..' style of
> > quoting.  This doesn't work for MinGW, which supports only the ".."
> > style.  This causes, e.g., diff3 to fail for file names with embedded
> > whitespace or other special characters, when compiled for MinGW.
> 
> What exactly did not work? Does 'diff3' give an error message that
> it cannot find the file? Does a unit test from the diffutils package
> not work? Does 'diff3' produce an output that is incompatible with
> other tools (such as 'patch' or 'emacs')?

Diff3 failed with an error message.

> In other words, please state a "How to reproduce" recipe.

Here:

  D:\gnu\diffutils-3.2\src>.\diff3 ../../diffutils-2.8.7/src/system.h system.h "sys tem.$h$"
  diff: extra operand `tem.$h$''
  diff: Try `diff --help' for more information.
  D:\gnu\diffutils-3.2\src/./diff3.exe: subsidiary program `diff' failed (exit status 2)

> > +/* The (system-dependent) shell quoting character.  */
> > +#ifdef __MINGW32__
> 
> This #ifdef is true for mingw but false for native Windows executables
> built with MSVC. Is that what you intended?

I only tested the code with MinGW.  But I don't mind using

 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

instead, if you are okay with assuming it will work with MSVC.

> > +          if (quoting_style == shell_always_quoting_style)
> > +	    {
> > +	      if (elide_outer_quotes)
> > +		goto force_outer_quoting_style;
> > +	      if (c == '"' && c == shell_quoting_char)
> > +		{
> > +		  STORE ('"');
> > +		  STORE ('\\');
> > +		  STORE ('"');
> > +		}
> > +	    }
> 
> No tabs in gnulib source code, please.

Sorry, I didn't know that.  Do you need me to submit TAB-less diffs?

Thanks.