[Issue 5625] std.format unittest disabled

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5625



--- Comment #1 from Brad Roberts <braddr at puremagic.com> 2011-03-20 03:21:43 PDT ---
Here's the reduced version of this bug.  Larger than I'd like still, but is
proving hard to reduce further.

module bug;

extern(C) int printf(const char *, ...);

struct FormatSpec
{
    char spec = 's';
    bool flHash = false;

    // unused function, but if removed hides the bug
    void writeUpToNextSpec(OutputRange)(OutputRange writer) {}
}

void formatValue(long val, ref FormatSpec f)
{
    char[] w;
    long arg = val;

    // always true, but removing conditional hides the bug
    uint base = f.spec == 's' ? 10 : 0;

    // if moved above base line, or merged with the declaration, hides the bug
    arg = -arg;

    char buffer[64]; // 64 bits in base 2 at most
    uint i = buffer.length;
    auto n = cast(ulong) arg;
    do
    {  
        --i;
        buffer[i] = cast(char) (n % base);
        n /= base;
        if (buffer[i] < 10)
            buffer[i] += '0';
        else
            buffer[i] += 'A' - 10;
    }
    while (n);

    // unused, but if removed hides the bug;
    sizediff_t spacesToPrint = (base == 16 && f.flHash && arg);

    // always true, but needs the conditional to show the bug
    if (arg)
        w = buffer[i .. $];

    // the code to append the '-' to w was removable, so '999'
    // really is the expected results
    printf("w = %.*s\n", w.length, w.ptr);
    assert(w == "999");
}

int main()
{
    auto spec = FormatSpec();

    formatValue(-999L, spec);

    return 0;
}

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