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28 .\"
29 .\" $Id: curs_kernel.3x,v 1.15 2005/05/15 16:18:13 tom Exp $
30 .TH curs_kernel 3X ""
31 .na
32 .hy 0
33 .SH NAME
34 \fBdef_prog_mode\fR,
35 \fBdef_shell_mode\fR,
36 \fBreset_prog_mode\fR,
37 \fBreset_shell_mode\fR,
38 \fBresetty\fR,
39 \fBsavetty\fR,
40 \fBgetsyx\fR,
41 \fBsetsyx\fR,
42 \fBripoffline\fR,
43 \fBcurs_set\fR,
44 \fBnapms\fR - low-level \fBcurses\fR routines
45 .ad
46 .hy
47 .SH SYNOPSIS
48 \fB#include <curses.h>\fR
49 .sp
50 \fBint def_prog_mode(void);\fR
51 .br
52 \fBint def_shell_mode(void);\fR
53 .br
54 \fBint reset_prog_mode(void);\fR
55 .br
56 \fBint reset_shell_mode(void);\fR
57 .br
58 \fBint resetty(void);\fR
59 .br
60 \fBint savetty(void);\fR
61 .br
62 \fBvoid getsyx(int y, int x);\fR
63 .br
64 \fBvoid setsyx(int y, int x);\fR
65 .br
66 \fBint ripoffline(int line, int (*init)(WINDOW *, int));\fR
67 .br
68 \fBint curs_set(int visibility);\fR
69 .br
70 \fBint napms(int ms);\fR
71 .br
72 .SH DESCRIPTION
73 The following routines give low-level access to various \fBcurses\fR
74 capabilities. Theses routines typically are used inside library
75 routines.
76 .PP
77 The \fBdef_prog_mode\fR and \fBdef_shell_mode\fR routines save the
78 current terminal modes as the "program" (in \fBcurses\fR) or "shell"
79 (not in \fBcurses\fR) state for use by the \fBreset_prog_mode\fR and
80 \fBreset_shell_mode\fR routines. This is done automatically by
81 \fBinitscr\fR. There is one such save area for each screen context
82 allocated by \fBnewterm()\fR.
83 .PP
84 The \fBreset_prog_mode\fR and \fBreset_shell_mode\fR routines restore
85 the terminal to "program" (in \fBcurses\fR) or "shell" (out of
86 \fBcurses\fR) state. These are done automatically by \fBendwin\fR
87 and, after an \fBendwin\fR, by \fBdoupdate\fR, so they normally are
88 not called.
89 .PP
90 The \fBresetty\fR and \fBsavetty\fR routines save and restore the
91 state of the terminal modes. \fBsavetty\fR saves the current state in
92 a buffer and \fBresetty\fR restores the state to what it was at the
93 last call to \fBsavetty\fR.
94 .PP
95 The \fBgetsyx\fR routine returns the current coordinates of the virtual screen
96 cursor in \fIy\fR and \fIx\fR. If \fBleaveok\fR is currently \fBTRUE\fR, then
97 \fB-1\fR,\fB-1\fR is returned. If lines have been removed from the top of the
98 screen, using \fBripoffline\fR, \fIy\fR and \fIx\fR include these lines;
99 therefore, \fIy\fR and \fIx\fR should be used only as arguments for
100 \fBsetsyx\fR.
101 .PP
102 The \fBsetsyx\fR routine sets the virtual screen cursor to
103 \fIy\fR, \fIx\fR. If \fIy\fR and \fIx\fR are both \fB-1\fR, then
104 \fBleaveok\fR is set. The two routines \fBgetsyx\fR and \fBsetsyx\fR
105 are designed to be used by a library routine, which manipulates
106 \fBcurses\fR windows but does not want to change the current position
107 of the program's cursor. The library routine would call \fBgetsyx\fR
108 at the beginning, do its manipulation of its own windows, do a
109 \fBwnoutrefresh\fR on its windows, call \fBsetsyx\fR, and then call
110 \fBdoupdate\fR.
111 .PP
112 The \fBripoffline\fR routine provides access to the same facility that
113 \fBslk_init\fR [see \fBcurs_slk\fR(3X)] uses to reduce the size of the
114 screen. \fBripoffline\fR must be called before \fBinitscr\fR or
115 \fBnewterm\fR is called. If \fIline\fR is positive, a line is removed
116 from the top of \fBstdscr\fR; if \fIline\fR is negative, a line is
117 removed from the bottom. When this is done inside \fBinitscr\fR, the
118 routine \fBinit\fR (supplied by the user) is called with two
119 arguments: a window pointer to the one-line window that has been
120 allocated and an integer with the number of columns in the window.
121 Inside this initialization routine, the integer variables \fBLINES\fR
122 and \fBCOLS\fR (defined in \fB<curses.h>\fR) are not guaranteed to be
123 accurate and \fBwrefresh\fR or \fBdoupdate\fR must not be called. It
124 is allowable to call \fBwnoutrefresh\fR during the initialization
125 routine.
126 .PP
127 \fBripoffline\fR can be called up to five times before calling \fBinitscr\fR or
128 \fBnewterm\fR.
129 .PP
130 The \fBcurs_set\fR routine sets the cursor state is set to invisible,
131 normal, or very visible for \fBvisibility\fR equal to \fB0\fR,
132 \fB1\fR, or \fB2\fR respectively. If the terminal supports the
133 \fIvisibility\fR requested, the previous \fIcursor\fR state is
134 returned; otherwise, \fBERR\fR is returned.
135 .PP
136 The \fBnapms\fR routine is used to sleep for \fIms\fR milliseconds.
137 .SH RETURN VALUE
138 Except for \fBcurs_set\fR, these routines always return \fBOK\fR.
139 .PP
140 \fBcurs_set\fR
141 returns the previous cursor state, or \fBERR\fR if the
142 requested \fIvisibility\fR is not supported.
143 .PP
144 X/Open defines no error conditions.
145 In this implementation
146 .RS
147 .TP 5
148 \fBdef_prog_mode\fR, \fBdef_shell_mode\fR, \fBreset_prog_mode\fR, \fBreset_shell_mode\fR
149 return an error
150 if the terminal was not initialized, or
151 if the I/O call to obtain the terminal settings fails.
152 .TP 5
153 \fBripoffline\fP
154 returns an error if the maximum number of ripped-off lines
155 exceeds the maximum (NRIPS = 5).
156 .RE
157 .SH NOTES
158 Note that \fBgetsyx\fR is a macro, so \fB&\fR is not necessary before
159 the variables \fIy\fR and \fIx\fR.
160 .PP
161 Older SVr4 man pages warn that the return value of \fBcurs_set\fR "is currently
162 incorrect". This implementation gets it right, but it may be unwise to count
163 on the correctness of the return value anywhere else.
164 .PP
165 Both ncurses and SVr4 will call \fBcurs_set\fR in \fBendwin\fR
166 if \fBcurs_set\fR
167 has been called to make the cursor other than normal, i.e., either
168 invisible or very visible.
169 There is no way for ncurses to determine the initial cursor state to
170 restore that.
171 .SH PORTABILITY
172 The functions \fBsetsyx\fR and \fBgetsyx\fR are not described in the XSI
173 Curses standard, Issue 4. All other functions are as described in XSI Curses.
174 .PP
175 The SVr4 documentation describes \fBsetsyx\fR and \fBgetsyx\fR as having return
176 type int. This is misleading, as they are macros with no documented semantics
177 for the return value.
178 .SH SEE ALSO
179 \fBcurses\fR(3X), \fBcurs_initscr\fR(3X), \fBcurs_outopts\fR(3X), \fBcurs_refresh\fR(3X),
180 \fBcurs_scr_dump\fR(3X), \fBcurs_slk\fR(3X)
181 .\"#
182 .\"# The following sets edit modes for GNU EMACS
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