Function strwidth

crawl-ref/source/unicode.cc:474–488

}

int strwidth(const char *s)
{
    char32_t c;
    int w = 0;

    while (int l = utf8towc(&c, s))
    {
        s += l;
        int cw = wcwidth(c);
        if (cw != -1) // shouldn't ever happen
            w += cw;
    }

    return w;
}

int strwidth(const string &s)
{