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- Add __MINGW32__ detection in memset_s_shim.c for proper EXPORT macro - Add WIN32 and __WIN32__ defines when compiling the shim in build.rs - The memset_explicit symbol is required by libsodium-sys-stable but not available in MinGW runtime - The shim is compiled as a static library and linked before libsodium
34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
/* memset_explicit shim for Windows MinGW
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*
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* libsodium-sys-stable expects memset_explicit which isn't available
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* in the MinGW runtime. This provides a compatible implementation.
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*
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* This shim is compiled as part of the build process when targeting
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* Windows with MinGW (x86_64-w64-mingw32).
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*/
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#include <string.h>
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#include <stddef.h>
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/*
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* Windows symbol export macros.
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* __declspec(dllexport) ensures the symbol is visible in the compiled object.
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*/
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#if defined(_WIN32) || defined(__WIN32__) || defined(__MINGW32__)
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#define EXPORT __declspec(dllexport)
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#else
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#define EXPORT __attribute__((visibility("default")))
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#endif
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/*
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* memset_explicit implementation - a secure memory clearing function.
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* Uses volatile to prevent compiler optimization from removing the memset.
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* This matches the signature expected by libsodium.
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*/
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EXPORT void memset_explicit(void *dest, int val, size_t n) {
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volatile unsigned char *p = (volatile unsigned char *)dest;
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while (n--) {
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*p++ = (unsigned char)val;
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}
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}
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