I got a different result on my home 1.5 box, which has too old
XPG4DL. I get the same result on my office 1.5.1 box, which has newer
XPG4DL.

The multibyte string in my previous example contains, a 3 byte shift
sequence, 2 byte characters x 3, and a 3 byte shift sequence, so

  - mbrlen(string, 0, ps)
  - mbrlen(string, 1, ps)
  - mbrlen(string, 2, ps)
  - mbrlen(string, 3, ps)
  - mbrlen(string, 4, ps)

should all return -2. And

  - mbrlen(string, 5, ps)
  - mbrlen(string, 6, ps)
  - mbrlen(string, 7, ps)
  - :

should return 5. Please tell me if I miss something...

Regards,
Masao