[Patch, libgfortran] String spring cleanup (or, spring string cleanup)

[Janne Blomqvist]

:ADDPATCH fortran:

Hi,

the following patch does some minor string cleanups in libgfortran. 
Mainly it does

1) Use gfc_charlen_type for the string lengths in the Fortran string 
functions instead of int, and size_t for C strings in the same functions.

2) In a few places where it's not blindingly obvious that the 
destination buffer will be big enough in every imaginable case, use 
snprintf instead of sprintf if it's available.

3) Use memcpy instead of strcpy and strcat. Faster as we don't have to 
scan the strings for \0 repeatedly (easily quadratic behavior in loops). 
Not really any buffer overflow reduction benefit as long as we still 
blindly trust that strlen will get it right.

Regtested on i686-pc-linux-gnu, ok for trunk?

-- 
Janne Blomqvist
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