[patch, fortran] Fix PR 32977

[Thomas Koenig]

:ADDPATCH fortran:

Hello world,

looks like vsnprintf wasn't available on every platform after all.
This patch fixes that by using a buffer that should be large enough,
and by issuing an error message in case of a buffer overflow.

Because the buffer is static, chances are pretty good that an overrun
won't clobber the other automatic variables in that routine.

Regression-tested on i686-pc-linux-gnu twice:

- with the #ifdef HAVE_VSNPRINTF replaced by #if 0 to check that
  codepath

- 'as is', to check the normal codepath

without any regressions.

OK for trunk?

	Thomas

2007-07-29  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/32977
	* io/unix.c:  If there is no vsnprintf, use vsprintf and issue
	a fatal error when a buffer overrun occurs.


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