[ seems the gateway on e-fever is down again. -_- someday I'm gonna write a better bbs gateway program ... ]
On Mon, Oct 16, 2000 at 08:53:17PM +0800, Isaac Kar-Keung To wrote: > >>>>> "Roger" == Roger So <[EMAIL PROTECTED]> writes: > > Roger> So, given a stream of bytes which might contain multibyte > Roger> characters, how would I test whether a byte is, say, printable? > Roger> Do I need to test for MB_CUR_MIN to MB_CUR_MAX number of bytes > Roger> instead of individual bytes? (seems wildly inefficient ...) > > Or is it that when MB_CUR_MAX!=1, you really shouldn't "check whether a byte > is printable"? It doesn't make much sense to me: even if 0xA6 or 0xA7 > appear as a byte in a BIG5 character, there is no guarantee that D8A7, say, > is a valid BIG5! So it's neither "printable" nor "unprintable"... No, the point I was making was, say you have 0x20 0xD0 0xF6 (a space followed by some Big5 character). First you check isprint(0x20); that succeeds, so you move on to isprint(0xD0). Oops, 0xD0 is not printable. But MB_CUR_MAX = 2. So we check it now with 2 bytes together ... isprint(0xD0F6) ... great, that's printable, and we move on to the next byte ... -- Roger So telnet://e-fever.org spacehunt at e-fever dot org SysOp, e-Fever BBS GnuPG 1024D/98FAA0AD F2C3 4136 8FB1 7502 0C0C 01B1 0E59 37AC 98FA A0AD
