Bug #20873: `printf("%f")` returns wrong result for `Rational` with `FIXNUM_MIN`

• Status: Closed
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: -
• Backport: 3.1: REQUIRED, 3.2: DONE, 3.3: DONE

[nobu (Nobuyoshi Nakada)]

Since the beginning, ruby 2.3.

require 'rbconfig/sizeof'
fmin, fmax = RbConfig::LIMITS.values_at("FIXNUM_MIN", "FIXNUM_MAX")
sprintf("%f", Rational(fmin, fmax)) #=> --1.000000

[nobu (Nobuyoshi Nakada)]

• Assignee set to nobu (Nobuyoshi Nakada)
• Backport changed from 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN to 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|d71be7274bd2623bb521be72c245c08fc38d6ae4.

---

[Bug #20873] Consider -FIXNUM_MIN overflow

-FIXNUM_MIN is usually greater than FIXNUM_MAX on platforms using
two's complement representation.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED to 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED

ruby_3_2 a7b013b392ca0ba4930e579f4c9e40d99d871752 merged revision(s) d71be7274bd2623bb521be72c245c08fc38d6ae4.

[k0kubun (Takashi Kokubun)]

• Backport changed from 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED to 3.1: REQUIRED, 3.2: DONE, 3.3: DONE

ruby_3_3 1ec258ab7002210670171f3f2f0c4b39657e24a4 merged revision(s) d71be7274bd2623bb521be72c245c08fc38d6ae4.

[nobu (Nobuyoshi Nakada)]

[Bug #20873] Consider -FIXNUM_MIN overflow

-FIXNUM_MIN is usually greater than FIXNUM_MAX on platforms using
two's complement representation.

[nagachika (Tomoyuki Chikanaga)]

merge revision(s) d71be7274bd2623bb521be72c245c08fc38d6ae4: [Backport #20873]

    [Bug #20873] Consider `-FIXNUM_MIN` overflow

    `-FIXNUM_MIN` is usually greater than `FIXNUM_MAX` on platforms using
    two's complement representation.

[k0kubun (Takashi Kokubun)]

merge revision(s) d71be7274bd2623bb521be72c245c08fc38d6ae4: [Backport #20873]

    [Bug #20873] Consider `-FIXNUM_MIN` overflow

    `-FIXNUM_MIN` is usually greater than `FIXNUM_MAX` on platforms using
    two's complement representation.