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Convert long doubles under a multi-byte decimal point completely

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The strtold fallback, which is left only for long double formats that
are not binary64 (x87, binary128), substituted the first byte of the
locale's decimal point for '.'. Under a locale whose decimal point is
longer than one byte, such as fa_IR.UTF-8 or ar_EG.UTF-8 (U+066B),
strtold stopped there and the value was truncated at the decimal point.
A longer decimal point is now put into a copy of the token.

The test "locale with a multi-byte decimal point" now compares the long
double values with those of the "C" locale; with x87 long doubles it
failed before.

Fixes #5660.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-30 20:19:11 +02:00
committed by GitHub
parent 44ec53c77b
commit 9c71689715
4 changed files with 101 additions and 65 deletions
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docs/mkdocs/docs/features/types/number_handling.md
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@@ -74,7 +74,8 @@ otherwise, it uses unsigned integer storage.
- The library converts integers and floating-point numbers itself, independent of the locale. Floating-point
numbers are correctly rounded (to nearest, ties to even). Only a `#!c long double` that is not IEEE 754 binary64
(e.g., the 80-bit x87 format) is converted with `#!cpp std::from_chars` where available, or with
[`std::strtold`](https://en.cppreference.com/w/cpp/string/byte/strtof).
[`std::strtold`](https://en.cppreference.com/w/cpp/string/byte/strtof), which gets the decimal point of the
current locale, also one longer than one byte (e.g., in `fa_IR.UTF-8`).
!!! example "Examples"