1curs_kernel(3X)                                                curs_kernel(3X)
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NAME

6       def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode,
7       resetty, savetty, getsyx, setsyx, ripoffline, curs_set, napms - low-
8       level curses routines
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SYNOPSIS

11       #include <curses.h>
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13       int def_prog_mode(void);
14       int def_shell_mode(void);
15       int reset_prog_mode(void);
16       int reset_shell_mode(void);
17       int resetty(void);
18       int savetty(void);
19       void getsyx(int y, int x);
20       void setsyx(int y, int x);
21       int ripoffline(int line, int (*init)(WINDOW *, int));
22       int curs_set(int visibility);
23       int napms(int ms);
24

DESCRIPTION

26       The following routines give low-level access to various curses capabil‐
27       ities.  These routines typically are used inside library routines.
28
29       The def_prog_mode and def_shell_mode routines save the current terminal
30       modes as the "program" (in curses) or "shell" (not in curses) state for
31       use by the reset_prog_mode and reset_shell_mode routines.  This is done
32       automatically  by initscr.  There is one such save area for each screen
33       context allocated by newterm().
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35       The reset_prog_mode and reset_shell_mode routines restore the  terminal
36       to  "program"  (in curses) or "shell" (out of curses) state.  These are
37       done automatically by endwin and, after an endwin, by doupdate, so they
38       normally are not called.
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40       The resetty and savetty routines save and restore the state of the ter‐
41       minal modes.  savetty saves the current state in a buffer  and  resetty
42       restores the state to what it was at the last call to savetty.
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44       The  getsyx  routine  returns  the  current  coordinates of the virtual
45       screen cursor in y and x.  If leaveok is currently TRUE, then -1,-1  is
46       returned.  If lines have been removed from the top of the screen, using
47       ripoffline, y and x include these lines; therefore, y and x  should  be
48       used only as arguments for setsyx.
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50       The  setsyx routine sets the virtual screen cursor to y, x.  If y and x
51       are both -1, then leaveok is set.  The two routines getsyx  and  setsyx
52       are  designed to be used by a library routine, which manipulates curses
53       windows but does not want to change the current position  of  the  pro‐
54       gram's cursor.  The library routine would call getsyx at the beginning,
55       do its manipulation of its own windows, do a wnoutrefresh on  its  win‐
56       dows, call setsyx, and then call doupdate.
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58       The  ripoffline  routine  provides  access  to  the  same facility that
59       slk_init [see curs_slk(3X)] uses to reduce  the  size  of  the  screen.
60       ripoffline must be called before initscr or newterm is called.  If line
61       is positive, a line is removed from the top of stdscr; if line is nega‐
62       tive,  a  line  is  removed  from the bottom.  When this is done inside
63       initscr, the routine init (supplied by the user) is called with two ar‐
64       guments: a window pointer to the one-line window that has been allocat‐
65       ed and an integer with the number of columns  in  the  window.   Inside
66       this  initialization routine, the integer variables LINES and COLS (de‐
67       fined in <curses.h>) are not guaranteed to be accurate and wrefresh  or
68       doupdate must not be called.  It is allowable to call wnoutrefresh dur‐
69       ing the initialization routine.
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71       ripoffline can be called up to five times  before  calling  initscr  or
72       newterm.
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74       The  curs_set  routine  sets  the cursor state to invisible, normal, or
75       very visible for visibility equal to 0, 1, or 2 respectively.   If  the
76       terminal  supports  the visibility requested, the previous cursor state
77       is returned; otherwise, ERR is returned.
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79       The napms routine is used to sleep for ms milliseconds.
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RETURN VALUE

82       Except for curs_set, these routines always return OK.
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84       curs_set returns the previous cursor state, or  ERR  if  the  requested
85       visibility is not supported.
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87       X/Open defines no error conditions.  In this implementation
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89              def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode
90                   return  an error if the terminal was not initialized, or if
91                   the I/O call to obtain the terminal settings fails.
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93              ripoffline
94                   returns an error if the maximum number of ripped-off  lines
95                   exceeds the maximum (NRIPS = 5).
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NOTES

98       Note that getsyx is a macro, so & is not necessary before the variables
99       y and x.
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101       Older SVr4 man pages warn that the return value of  curs_set  "is  cur‐
102       rently  incorrect".   This  implementation gets it right, but it may be
103       unwise to count on the correctness of the return value anywhere else.
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105       Both ncurses and SVr4 will call curs_set in endwin if curs_set has been
106       called  to make the cursor other than normal, i.e., either invisible or
107       very visible.  There is no way for ncurses  to  determine  the  initial
108       cursor state to restore that.
109

PORTABILITY

111       The  functions  setsyx  and  getsyx are not described in the XSI Curses
112       standard, Issue 4.  All other functions are as described in XSI Curses.
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114       The SVr4 documentation describes setsyx and  getsyx  as  having  return
115       type int. This is misleading, as they are macros with no documented se‐
116       mantics for the return value.
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SEE ALSO

119       curses(3X),   curs_initscr(3X),   curs_outopts(3X),   curs_refresh(3X),
120       curs_scr_dump(3X), curs_slk(3X), curs_variables(3X).
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124                                                               curs_kernel(3X)
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