> On 09/04/2008 17:27, Mike Williams wrote: > > On 09/04/2008 17:16, Bram Moolenaar wrote: > >> Francois Ingelrest wrote: > >> > >>> On Wed, Apr 9, 2008 at 5:30 PM, Bram Moolenaar <[EMAIL PROTECTED]> wrote: > >>>> Easy to reproduce. Turns out that this line causes it: > >>>> > >>>> sprintf(tmp, format, f); > >>>> > >>>> Here "format" is "%f" and "f" is your value 1e+308. The result is an > >>>> awful long string of numbers. I suppose it's about 308 digits. How big > >>>> does "tmp" need to be to hold any result here? I don't think %f has a > >>>> way of specifying a maximal field width. > >>> You could use snprintf() to specify the maximum length of tmp. > >> Unfortunately, snprintf() is not available everywhere, and the > >> implementations are not always working in a portable way. > >> > >> The code actually is inside vim_snprintf(), which is the Vim > >> implementation of snprintf(). But it still uses sprintf() to do the > >> difficult work. > >> > >> I guess that 1e308 is about the largest number supported by "double". > >> At least for me 1e309 results in "infinity". Would it be safe enough to > >> use a buffer of about 350 chars? Or are there platforms where "double" > >> can be much bigger? > > > > Intel FPU's have 80 bit reals supporting IEEE 754 double extended > > precision, with an absolute exponent range of 16384. And then there are > > 128 bit reals as well ... You have to draw the line somewhere ;-) > > Ugh, apologies, 16384 is the binary exponent value, this maps to (if my > brain is working) a upper range limit of ~1x10^4932. For completeness > IEEE 754 128 bit real has an upper range limit of ~1X10^6144. > > There are other fp representations with even greater range
OK, so we do need to worry about this.
This patch to message.c, replacing the previous one, should do it.
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God made the integers; all else is the work of Man.
-- Kronecker
/// Bram Moolenaar -- [EMAIL PROTECTED] -- http://www.Moolenaar.net \\\
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