[Issue 9297] New: Formatting of floating point values in std.format truncates reals to double

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9297

           Summary: Formatting of floating point values in std.format
                    truncates reals to double
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bugzilla at digitalmars.com


--- Comment #0 from Walter Bright <bugzilla at digitalmars.com> 2013-01-11 21:55:36 PST ---
The following from std.format shows the problem:

    n = snprintf(fbuf.ptr, sl, format.ptr, field_width,
            precision, cast(double)v);

It relies on the VC runtime library function snprintf to do the formatting, but
that function does not support 80 bit reals.

To fix we'll need to write our own 80 bit formatting routine instead of relying
on the host C compiler's.

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