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System / termcurses Termcurses
Terminal emulation library for NuttX
Author: Ken Pettit
Date: 2018-2019
The Termcurses library provides terminal emulation support for performing common
screen actions such as cursor movement, foreground / background color control
and keyboard escape sequence mapping. The initial release supports only vt100
/ ansi terminal types, but the library architecture has an extensible
interface to allow support for additional emulation types if needed.
The library can be used standalone or in conjunction with the
apps/graphics/pdcurses libraries. The pdcurses libraries have been updated
with a termcurses config option which fully integrates the termcurses library
automatically.
Usage
To use the termcurses library, the routines must be initialized by calling the
termcurses_initterm() function. This routine accepts a terminal type string
identifying the type of terminal emulation support requested. If a NULL
pointer is passed, then the routine will check for a TERM environment variable
and set the terminal type based on that string. If the emulation type still
cannot be determined, the routine will default to vt100 emulation type.
Upon successful initialization, the termcurses_initterm() function will
allocate an new terminal context which must be passed with all future termcurses
library functions. When this context is no longer needed, the
termcurses_deinitterm() routine should be called for proper freeing and
terminal teardown.
Use with telnetd
When using termcurses with the telnet daemon, the telnet config option
CONFIG_TELNET_SUPPORT_NAWS should be enabled. This option adds code to the
telnet library for terminal size negotiation. Without this option, the telnet
routines have no concept of the terminal size, and therefore the termcurses
routines must default to 80x24 screen mode.
Use with pdcurses
When using the pdcurses termcurses support (i.e you have enabled both the
CONFIG_PDCURSES and CONFIG_TERMCURSES options),, the pdcurses input device
should be selected to be TERMINPUT (i.e. set CONFIG_PDCURSES_TERMINPUT=y).
This causes the pdcurses keyboard input logic to use termcurses_getkeycode()
routine for curses input.