03-08-2002
Well this was a new one on me. I didn't know that curses had this capability. But I've been looking over the documentation and I'll make a couple of guesses.
First, are you sure that your terminal can draw lines this way? Almost no one actually uses a true vt-100. Instead you may have a terminal that is emulating a vt-100 or you may be using a program like xterm that emulates a vt-100. xterm can only do what the font can do. My xterm cannot draw lines. But I'm not going to try any different fonts to see what I can do. So the first thing I would try is to write a non-curses program that sends the correct character string to the terminal and verify that it is possible.
If the terminal can really draw lines, the next thing to worry about is the terminfo entry. You may need to write a new one. I have seen several cases where complex curses stuff did not work because the OS came with a poor terminfo entry. I think that the manufacters simply ensure that the terminfo entry can run vi. They can't be testing it much beyond that from what I've seen.
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curs_variables(3X) curs_variables(3X)
NAME
COLORS, COLOR_PAIRS, COLS, ESCDELAY, LINES, TABSIZE, curscr, newscr, stdscr - curses global variables
SYNOPSIS
#include <curses.h>
int COLOR_PAIRS;
int COLORS;
int COLS;
int ESCDELAY;
int LINES;
int TABSIZE;
WINDOW * curscr;
WINDOW * newscr;
WINDOW * stdscr;
DESCRIPTION
This page summarizes variables provided by the curses library. A more complete description is given in the curses(3X) manual page.
Depending on the configuration, these may be actual variables, or macros (see curs_threads(3X)) which provide read-only access to curses's
state. In either case, applications should treat them as read-only to avoid confusing the library.
COLOR_PAIRS
After initializing curses, this variable contains the number of color pairs which the terminal can support. Usually the number of color
pairs will be the product COLORS*COLORS, however this is not always true:
o a few terminals use HLS colors, which do not follow this rule
o terminals supporting a large number of colors are limited by the number of color pairs that can be represented in a signed short value.
COLORS
After initializing curses, this variable contains the number of colors which the terminal can support.
COLS
After initializing curses, this variable contains the width of the screen, i.e., the number of columns.
ESCDELAY
This variable holds the number of milliseconds to wait after reading an escape character, to distinguish between an individual escape char-
acter entered on the keyboard from escape sequences sent by cursor- and function-keys (see curses(3X).
LINES
After initializing curses, this variable contains the height of the screen, i.e., the number of lines.
TABSIZE
This variable holds the number of columns used by the curses library when converting a tab character to spaces as it adds the tab to a win-
dow (see curs_addch(3X).
The Current Screen
This implementation of curses uses a special window curscr to record its updates to the terminal screen.
The New Screen
This implementation of curses uses a special window newscr to hold updates to the terminal screen before applying them to curscr.
The Standard Screen
Upon initializing curses, a default window called stdscr, which is the size of the terminal screen, is created. Many curses functions use
this window.
NOTES
The curses library is initialized using either initscr(3X), or newterm(3X).
If curses is configured to use separate curses/terminfo libraries, most of these variables reside in the curses library.
PORTABILITY
ESCDELAY and TABSIZE are extensions, not provided in most other implementations of curses.
SEE ALSO
curses(3X), curs_threads(3X), term_variables(3X), terminfo(3X), terminfo(5).
curs_variables(3X)