stringprep_utf8_to_ucs4 - API function
uint32_t * stringprep_utf8_to_ucs4(const char * str, ssize_t len, size_t * items_written);
Convert a string from UTF-8 to a 32-bit fixed width representation as UCS-4. The function now performs error checking to verify that the input is valid UTF-8 (before it was documented to not do error checking).
Return value: a pointer to a newly allocated UCS-4 string. This value must be deallocated by the caller.
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