[Bug libstdc++/110239] [14 regression] std/format/functions/format.cc fails after r14-1648-g628ba410b9265d

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110239

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:3bb9f9329c378934541ae4cff9977b7487e97cf0

commit r14-2105-g3bb9f9329c378934541ae4cff9977b7487e97cf0
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Jun 26 14:46:46 2023 +0100

    libstdc++: Fix std::format for pointers [PR110239]

    The formatter for pointers was casting to uint64_t which sign extends a
    32-bit pointer and produces a value that won't fit in the provided
    buffer. Cast to uintptr_t instead.

    There was also a bug in the __parse_integer helper when converting a
    wide string to a narrow string in order to use std::from_chars on it.
    The function would always try to read 32 characters, even if the format
    string was shorter than that. Fix that bug, and remove the constexpr
    implementation of __parse_integer by just using __from_chars_alnum
    instead of from_chars, because that's usable in constexpr even in
    C++20.

    libstdc++-v3/ChangeLog:

            PR libstdc++/110239
            * include/std/format (__format::__parse_integer): Fix buffer
            overflow for wide chars.
            (formatter<const void*, C>::format): Cast to uintptr_t instead
            of uint64_t.
            * testsuite/std/format/string.cc: Test too-large widths.