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gh-NNNN: Vendor Wuffs v0.4 float parser into Python/_wuffs/
Drops the single-file amalgamated Wuffs source. Only the base/floatconv sub-module will be compiled — controlled by WUFFS_CONFIG__MODULE__BASE__* defines set in the build rule added in a later commit. The amalgamation is 3.3 MB on disk but compiles to ~80–100 KB of object code once the image-codec / JSON / compression modules are preprocessor-stripped. No integration yet. A later commit adds the C ABI shim Python/_wuffs/wuffs_strtod.c that wraps wuffs_base__parse_number_f64 behind an extern "C" _Py_wuffs_strtod entry point matching _Py_dg_strtod's contract. License: Apache-2.0 OR MIT (see LICENSE-APACHE). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎Python/_wuffs/LICENSE-APACHE‎

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This software is distributed under the terms of both the MIT license and the
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Apache License (Version 2.0).
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MIT license
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Copyright 2023 The Wuffs Authors
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Permission is hereby granted, free of charge, to any
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person obtaining a copy of this software and associated
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documentation files (the "Software"), to deal in the
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Software without restriction, including without
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limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software
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is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice
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shall be included in all copies or substantial portions
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of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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Apache 2 license
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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‎Python/_wuffs/README.vendor‎

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Vendored subset of the Wuffs library, used by Python/pystrtod.c for
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string-to-float conversion (replaces _Py_dg_strtod from Python/dtoa.c).
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Upstream: https://github.com/google/wuffs
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Version: v0.4 amalgamated single-file release
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Commit: 126a80a (main branch at time of drop, 2026-04-21)
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License: Apache-2.0 OR MIT (dual; see LICENSE-APACHE)
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Files included:
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wuffs-v0.4.c — single-file amalgamated Wuffs release. Despite the
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.c extension, this doubles as both the header and
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the implementation — see WUFFS_IMPLEMENTATION
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below.
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LICENSE-APACHE — upstream dual-license text
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Size note. The amalgamated source is ~3.3 MB because it ships every
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Wuffs module (image codecs, JSON, compression, etc.). We only compile in
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the `base` module's `floatconv` sub-module by defining
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WUFFS_CONFIG__STATIC_FUNCTIONS
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WUFFS_CONFIG__MODULES
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WUFFS_CONFIG__MODULE__BASE
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WUFFS_CONFIG__MODULE__BASE__CORE
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WUFFS_CONFIG__MODULE__BASE__FLOATCONV
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WUFFS_CONFIG__MODULE__BASE__INTCONV
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WUFFS_IMPLEMENTATION
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in the TU that compiles wuffs-v0.4.c. Unused modules become empty after
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the preprocessor pass; the resulting object file is ~80–100 KB.
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The actual bridge between Wuffs and CPython is Python/_wuffs/wuffs_strtod.c,
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which wraps wuffs_base__parse_number_f64 behind an extern _Py_wuffs_strtod
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entry point matching the old _Py_dg_strtod calling convention (takes an
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ASCII C string, returns a double, writes the end-of-parse pointer into
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*endptr, sets errno = ERANGE on over/underflow).
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Updating:
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curl -L -o Python/_wuffs/wuffs-v0.4.c \
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https://raw.githubusercontent.com/google/wuffs/<SHA>/release/c/wuffs-v0.4.c
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curl -L -o Python/_wuffs/LICENSE-APACHE \
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https://raw.githubusercontent.com/google/wuffs/<SHA>/LICENSE
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Then update this file's commit line.

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