46 lines
2.3 KiB
C
46 lines
2.3 KiB
C
#ifndef PYTHON_WIN9X_MSVC600_STDINT_H
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#define PYTHON_WIN9X_MSVC600_STDINT_H
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/* VC6-only fallback for the C99 <stdint.h> header.
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*
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* Visual C++ 6.0 (_MSC_VER 1200) predates C99 and ships no <stdint.h>. This
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* project-local header is found ahead of any system <stdint.h> only because
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* compat/msvc600 is placed first on the VC6 probe scripts' include path
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* (scripts/vc6-probe.sh, scripts/vc6-probe-core.sh, scripts/vc6-probe-
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* pythoncore-frontier.sh); it is never installed anywhere a standards-
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* conforming compiler's own <stdint.h> would be found instead, so it never
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* shadows a real one.
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*
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* First consumer: cpython/Modules/_blake2/impl/blake2.h and
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* blake2-impl.h, which use only uint8_t, uint32_t, and uint64_t (verified
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* by grepping every fixed-width identifier used across Modules/_blake2/,
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* including the blake2b/blake2s/*-ref.c reference implementations and
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* clinic-generated wrappers: no int8_t/int16_t/int32_t/int64_t or intptr_t/
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* uintptr_t appear anywhere in that tree). `size_t` is used too, but that
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* already comes from <stddef.h>, which VC6 has natively.
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*
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* compat/msvc600/inttypes.h already defines exactly these typedefs (plus
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* the PRI* macros CPython's own Include/pyport.h needs from a real C99
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* <inttypes.h>) for this same VC6 target. Rather than re-declaring
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* uint8_t/uint32_t/uint64_t a second time under a second include guard
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* (which would risk a duplicate-typedef error in any translation unit that
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* ends up including both this header and <inttypes.h>, e.g. anything that
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* pulls in both Python.h and a <stdint.h>-using third-party header like
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* blake2.h), this header just forwards to it. inttypes.h's own include
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* guard makes this forwarding idempotent no matter which of the two headers
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* a given translation unit reaches first.
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*
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* Width assumptions (all already relied upon by inttypes.h and unchanged
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* here): uint8_t = unsigned char (1 byte), uint32_t = unsigned long
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* (4 bytes on Win32/ILP32), uint64_t = unsigned __int64 (VC6's non-standard
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* 64-bit extension, 8 bytes). These match the sizes BLAKE2 requires.
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*/
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#if !defined(_MSC_VER) || _MSC_VER >= 1300
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#error "compat/msvc600/stdint.h is a VC6-only (_MSC_VER < 1300) fallback; a standard <stdint.h> should be used instead."
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#endif
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#include "inttypes.h"
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#endif /* PYTHON_WIN9X_MSVC600_STDINT_H */
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