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curs_initscr(3curses)
curs_initscr(3CURSES) Curses Library Functions curs_initscr(3CURSES)
NAME
curs_initscr, initscr, newterm, endwin, isendwin, set_term, delscreen -
curses screen initialization and manipulation routines
SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ]
#include <curses.h>
WINDOW *initscr(void);
int endwin(void);
int isendwin(void);
SCREEN *newterm(char *type, FILE *outfd, FILE *infd);
SCREEN *set_term(SCREEN *new);
void delscreen(SCREEN * sp);
DESCRIPTION
initscr() is almost always the first routine that should be called (the
exceptions are slk_init(), filter(), ripoffline(), use_env() and, for
multiple-terminal applications, newterm().) This determines the termi‐
nal type and initializes all curses data structures. initscr() also
causes the first call to refresh() to clear the screen. If errors
occur, initscr() writes an appropriate error message to standard error
and exits; otherwise, a pointer is returned to stdscr(). If the program
needs an indication of error conditions, newterm() should be used
instead of initscr(); initscr() should only be called once per appli‐
cation.
A program that outputs to more than one terminal should use the
newterm() routine for each terminal instead of initscr(). A program
that needs an indication of error conditions, so it can continue to run
in a line-oriented mode if the terminal cannot support a screen-ori‐
ented program, would also use this routine. The routine newterm()
should be called once for each terminal. It returns a variable of type
SCREEN * which should be saved as a reference to that terminal. The
arguments are the type of the terminal to be used in place of $TERM, a
file pointer for output to the terminal, and another file pointer for
input from the terminal (if type is NULL, $TERM will be used). The pro‐
gram must also call endwin() for each terminal being used before exit‐
ing from curses. If newterm() is called more than once for the same
terminal, the first terminal referred to must be the last one for which
endwin() is called.
A program should always call endwin() before exiting or escaping from
curses mode temporarily. This routine restores tty modes, moves the
cursor to the lower left-hand corner of the screen and resets the ter‐
minal into the proper non-visual mode. Calling refresh() or doupdate()
after a temporary escape causes the program to resume visual mode.
The isendwin() routine returns TRUE if endwin() has been called without
any subsequent calls to wrefresh(), and FALSE otherwise.
The set_term() routine is used to switch between different terminals.
The screen reference new becomes the new current terminal. The previous
terminal is returned by the routine. This is the only routine which
manipulates SCREEN pointers; all other routines affect only the current
terminal.
The delscreen() routine frees storage associated with the SCREEN data
structure. The endwin() routine does not do this, so delscreen() should
be called after endwin() if a particular SCREEN is no longer needed.
RETURN VALUES
endwin() returns the integer ERR upon failure and OK upon successful
completion.
Routines that return pointers always return NULL on error.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelUnsafe
SEE ALSO
curs_kernel(3CURSES), curs_refresh(3CURSES), curs_slk(3CURSES),
curs_util(3CURSES), curses(3CURSES), attributes(7)
NOTES
The header <curses.h> automatically includes the headers <stdio.h> and
<unctrl.h>.
Note that initscr() and newterm() may be macros.
Oracle Solaris 11.4 31 Dec 1996 curs_initscr(3CURSES)