COMMON: work around different vsnprintf behaviour on IRIX

The return value of vsnprintf when the provided buffer is not large
enough to hold the formatted string is implementation-dependent:

C99:  The size the formatted string would take up.
MSVC: -1, with no indication of how large the buffer should be.
IRIX: The number of characters actually written, which is at most
      the size of the buffer minus one, as the string is truncated
      to fit.  This means the only way to be sure the entire string
      is written is if the return value is less than the capacity - 1.

This change means that whenever we try to format a string where the size
is 1 below the built-in capacity, that the capacity will be needlessly increased.

If this turns out to be problematic we could make this behaviour __sgi conditional.

svn-id: r53143

0 files changed, 0 insertions, 0 deletions