On Tue, May 31, 2005 at 09:21:29PM +0930, Ron wrote: > Package: libncurses5 > Version: 5.4-4 > Severity: normal > > Hi, > > doing something like, for example, mvwprintw( stdscr, 23, 79, "x" ) > in an 80 x 24 terminal returns ERR even though the entire string can be > (and is) displayed correctly on the screen. > > The ERR would appear to be based on advancing the cursor position to > an invalid row in preparation for the next addch -- but since we never > write to that invalid position, it seems a bit unproductive to report > an error when writing to the last legal position before it. > > I can't find anything authoritative that specifies what _should_ happen > here, but the current behaviour does not seem very useful if an app > wishes to permit writing to the lower right cell, _and_ check for errors > that may be reported by libncurses. > > I have a vague memory of some historical issue related to this, but > can't pin it down for the moment.
Well, if I understand the problem right, the cursor's location _would_ be off the screen after doing this. This is the closest that I can see: * The _WRAPPED flag is useful only for telling an application that we've just * wrapped the cursor. We don't do anything with this flag except set it when * wrapping, and clear it whenever we move the cursor. If we try to wrap at * the lower-right corner of a window, we cannot move the cursor (since that * wouldn't be legal). So we return an error (which is what SVr4 does). * Unlike SVr4, we can successfully add a character to the lower-right corner * (Solaris 2.6 does this also, however). I don't think the defined interfaces for ncurses allow any way for you to figure this out. The best you could do would be check whether _WRAPPED was set; that makes it very likely, if not actually certain, that the lower right cell was filled. Assuming the string wasn't too long for the screen, of course. -- Daniel Jacobowitz CodeSourcery, LLC -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
