Signature
#define UTF8C_CONTROL 0x02000000 // Control category, Cc in the Unicode database.#define UTF8C_FORMAT 0x04000000 // Format category, Cf in the Unicode database.#define UTF8C_SURROGATE 0x08000000 // Surrogate category, Cs in the Unicode database.#define UTF8C_PRIVATE_USE 0x10000000 // Private use category, Co in the Unicode database.#define UTF8C_UNASSIGNED 0x20000000 // Unassigned category, Cn in the Unicode database.#define UTF8C_COMPATIBILITY 0x40000000 // Flag used for maintaining backwards compatibility with POSIX#define UTF8C_IGNORE_GRAPHEME_CLUSTER 0x80000000 // Flag used for checking only the general category of code points at the start of a grapheme cluster.