Fix warnings#755

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sjaeckel wants to merge 8 commits into

Commits on May 4, 2026

fix clang warning: 'err' may be used uninitialized

karel-m
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sjaeckel
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fix UBSanitizer issue: left-shifting negative integer is undefined behavior

karel-m
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sjaeckel
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fix UBSanitizer issue: memcpy/memcmp require non-null pointers even when the length is zero

karel-m
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sjaeckel
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fix UBSanitizer issue: applying non-zero offset to null pointer

karel-m
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sjaeckel
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fix clang warnings -Wstrict-prototypes -Wmissing-prototypes in tests+demos

karel-m
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sjaeckel
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fix clang warnings -Wmissing-variable-declarations

karel-m
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sjaeckel
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fix clang warnings -Wimplicit-fallthrough (while keeping /* FALLTHROUGH */ for some code review tools)

karel-m
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sjaeckel
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fix build failures with -std=c99

karel-m
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sjaeckel
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