[all-commits] [llvm/llvm-project] 6812bc: [libc] Fix off by one in long double buffer size (...

[michaelrj-google via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6812bc40bd6c70f7cae10d1e0a2aeac31cfaef03
      https://github.com/llvm/llvm-project/commit/6812bc40bd6c70f7cae10d1e0a2aeac31cfaef03
  Author: michaelrj-google <71531609+michaelrj-google at users.noreply.github.com>
  Date:   2024-02-06 (Tue, 06 Feb 2024)

  Changed paths:
    M libc/src/__support/float_to_string.h

  Log Message:
  -----------
  [libc] Fix off by one in long double buffer size (#80889)

The size for the long double BLOCK_BUFFER_LEN is calculated based on the
properties of the long double type. Somewhere in the calculation, the
result was mis-rounded so that the buffer was one element too small.
This patch fixes the issue and adds asserts to catch it sooner in the
future.