/* This software is licensed by the MIT License, see LICENSE file */
/*                                Copyright © 2022 Gregory Lirent */

#include "build.h"

char* tochar_unicode(char d[4], unsigned int uc) {
    if (uc <= 0x7f) {
        *d++ = uc;
        return d;
    } else if (uc <= 0x7ff) {
        *(d++) = 0xc0 | ((uc&0x07c0) >> 6);
    } else {
        if (uc <= 0xffff) {

            *(d++) = 0xe0 | ((uc&0xf000) >> 12);
        } else if (uc <= 0x10ffff) {
            *(d++) = 0xf0 | ((uc&0x1c0000) >> 18);
            *(d++) = 0x80 | ((uc&0x03f000) >> 12);
        } else return 0;

        *(d++) = 0x80 | ((uc&0x000fc0) >>  6);
    }

    *(d++) = 0x80 | (uc&0x003f);
    return d;
}