Fix pure functions #112
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Fix pure functions #112
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* utf8casecmp is calling utf8codepoint which is non-pure * utf8chr is calling utf8str which calls utf8codepoint * utf8ncasecmp is calling utf8codepoint * utf8str calls utf8codepoint * utf8casestr calls utf8codepoint
sheredom
reviewed
Sep 9, 2023
| /* Return less than 0, 0, greater than 0 if src1 < src2, src1 == src2, src1 > | ||
| * src2 respectively, case insensitive. */ | ||
| utf8_constexpr14 utf8_nonnull utf8_pure int | ||
| utf8_constexpr14 utf8_nonnull int |
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Sorry colour me dumb here - why is this not pure?
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Because it's calling utf8codepoint which is a non-pure function (utf8codepoint is writing to the pointer it receives as a parameter). This results in undefined behavior which is not very well handled by clang.
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Oh that's annoying. I might just change that instead!
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You mean the definition of utf8codepoint? I think that would require something like:
utf8_constexpr14_impl struct { utf8_int8_t *str; utf8_int32_t out_codepoint; }
utf8codepoint(const utf8_int8_t *utf8_restrict str)
so that the function becomes pure.
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This drops utf8_pure where the functions do non-pure calls and adds utf8_pure to functions that are not already marked pure.