Function is_ws

trim.h:28–35

whitespace */

/* whitespace */
static inline int
is_ws(unsigned char ch)
{
    const unsigned int mask = (1U << (' ' - 1)) | (1U << ('\r' - 1)) |
        (1U << ('\n' - 1)) | (1U << ('\t' - 1));
    ch--;
    return ch < ' ' && ((1U << ch) & mask);
}

/*
 * trim leading ws