/*

 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)

 *

 * Permission to use, copy, modify, and distribute this software

 * for any purpose and without fee is hereby granted. The author

 * disclaims all warranties with regard to this software.

 *

 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c

 */

#define TEKEN_UTF8_INVALID_CODEPOINT -1

struct interval {

        teken_char_t first;

        teken_char_t last;

};

/* Auxiliary function for binary search in interval table */

static inline int

{

        int mid;

                else

        }

static inline int

{

        /*

         * Sorted list of non-overlapping intervals of non-spacing characters.

         * Generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c"

         */

        static const struct interval combining[] = {

                { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },

                { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },

                { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },

                { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },

                { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },

                { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },

                { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },

                { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },

                { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },

                { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },

                { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },

                { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },

                { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },

                { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },

                { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },

                { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },

                { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },

                { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },

                { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },

                { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },

                { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },

                { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },

                { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },

                { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },

                { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },

                { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },

                { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },

                { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },

                { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },

                { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },

                { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },

                { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },

                { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },

                { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },

                { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },

                { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },

                { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },

                { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },

                { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },

                { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },

                { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },

                { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },

                { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },

                { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },

                { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },

                { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },

                { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },

                { 0xE0100, 0xE01EF }

        };

        /* Test for 8-bit control characters */

        /* Binary search in table of non-spacing characters */

            sizeof(struct interval) - 1))

        /*

         * If we arrive here, ucs is not a combining or C0/C1 control character

         */

/*

 * Converts an UTF-8 byte sequence to a codepoint as specified in

 * https://datatracker.ietf.org/doc/html/rfc3629#section-3 . The function

 * expects the 'bytes' array to start with the leading character.

 */

static inline teken_char_t

teken_utf8_bytes_to_codepoint(uint8_t bytes[4], int nbytes)

{

        /*

         * Check for malformed characters by comparing 'nbytes' to the byte

         * length of the character.

         *

         * The table in section 3 of RFC 3629 defines 4 different values

         * indicating the length of a UTF-8 byte sequence.

         *

         * 0xxxxxxx -> 1 byte

         * 110xxxxx -> 2 bytes

         * 1110xxxx -> 3 bytes

         * 11110xxx -> 4 bytes

         *

         * The length is determined by the higher-order bits in the leading

         * octet (except in the first case, where an MSB of 0 means a byte

         * length of 1). Here we flip the 4 upper bits and count the leading

         * zeros using __builtin_clz() to determine the number of bytes.

         */

#if 0

        if (__builtin_clz(~(bytes[0] & 0xf0) << 24) != nbytes)

                return (TEKEN_UTF8_INVALID_CODEPOINT);

#endif

        switch (nbytes) {

        case 1:

                if (bytes[0] & 0x80)

                        return (TEKEN_UTF8_INVALID_CODEPOINT);

                return (bytes[0] & 0x7f);

        case 2:

                if ((bytes[0] & 0xe0) != 0xc0)

                        return (TEKEN_UTF8_INVALID_CODEPOINT);

                return (bytes[0] & 0x1f) << 6 | (bytes[1] & 0x3f);

        case 3:

                if ((bytes[0] & 0xf0) != 0xe0)

                        return (TEKEN_UTF8_INVALID_CODEPOINT);

                return (bytes[0] & 0xf) << 12 | (bytes[1] & 0x3f) << 6 |

                    (bytes[2] & 0x3f);

        case 4:

                if ((bytes[0] & 0xf8) != 0xf0)

                        return (TEKEN_UTF8_INVALID_CODEPOINT);

                return (bytes[0] & 0x7) << 18 | (bytes[1] & 0x3f) << 12 |

                    (bytes[2] & 0x3f) << 6 | (bytes[3] & 0x3f);

        default:

                return (TEKEN_UTF8_INVALID_CODEPOINT);

        }

}