1 int buffer_append_long_hex(buffer *b, unsigned long value) { 2     char *buf; 3     int shift = 0; 4     unsigned long copy = value; 5  6     while (copy) { 7         copy >>= 4; 8         shift++; 9     }10     if (shift == 0)11         shift++;12     if (shift & 0x01)13         shift++;14 15     buffer_prepare_append(b, shift + 1);16     if (b->used == 0)17         b->used++;18     buf = b->ptr + (b->used - 1);19     b->used += shift;20 21     shift <<= 2;22     while (shift > 0) {23         shift -= 4;24         *(buf++) = hex_chars[(value >> shift) & 0x0F];25     }26     *buf = '\0';27 28     return 0;29 }