189 lines
7.6 KiB
Groff
189 lines
7.6 KiB
Groff
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.TH curs_getch 3X ""
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.SH NAME
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\fBcurs_getch\fR: \fBgetch\fR, \fBwgetch\fR, \fBmvgetch\fR,
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\fBmvwgetch\fR, \fBungetch\fR - get (or push back) characters from
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\fBncurses\fR terminal keyboard
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.SH SYNOPSIS
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\fB#include <ncurses.h>\fR
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\fBint getch(void);\fR
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.br
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\fBint wgetch(WINDOW *win);\fR
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.br
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\fBint mvgetch(int y, int x);\fR
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.br
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\fBint mvwgetch(WINDOW *win, int y, int x);\fR
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.br
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\fBint ungetch(int ch);\fR
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.br
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.SH DESCRIPTION
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The \fBgetch\fR, \fBwgetch\fR, \fBmvgetch\fR and \fBmvwgetch\fR, routines read
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a character from the window. In no-delay mode, if no input is waiting, the
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value \fBERR\fR is returned. In delay mode, the program waits until the system
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passes text through to the program. Depending on the setting of \fBcbreak\fR,
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this is after one character (cbreak mode), or after the first newline (nocbreak
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mode). In half-delay mode, the program waits until a character is typed or the
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specified timeout has been reached. Unless \fBnoecho\fR has been set, the
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character will also be echoed into the designated window.
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If the window is not a pad, and it has been moved or modified since the last
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call to \fBwrefresh\fR, \fBwrefresh\fR will be called before another character
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is read.
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If \fBkeypad\fR is \fBTRUE\fR, and a function key is pressed, the token for
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that function key is returned instead of the raw characters. Possible function
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keys are defined in \fB<ncurses.h>\fR as macros with values outside the range
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of 8-bit characters whose names begin with \fBKEY_.\fR Thus, a variable
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intended to hold the return value of a function key must be of short size or
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larger.
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When a character that could be the beginning of a function key is received
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(which, on modern terminals, means an escape character), \fBncurses\fR sets a
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timer. If the remainder of the sequence does not come in within the designated
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time, the character is passed through; otherwise, the function key value is
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returned. For this reason, many terminals experience a delay between the time
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a user presses the escape key and the escape is returned to the program.
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The \fBungetch\fR routine places \fIch\fR back onto the input queue to be
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returned by the next call to \fBwgetch\fR. Note that there is, in effect,
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just one input queue for all windows.
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.SS Function Keys
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The following function keys, defined in \fB<ncurses.h>\fR, might be returned by
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\fBgetch\fR if \fBkeypad\fR has been enabled. Note that not all of these are
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necessarily supported on any particular terminal.
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.nf
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__________________________________________________________________
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\fIName\fR \fIKey\fR \fIname\fR
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__________________________________________________________________
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KEY_BREAK Break key
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KEY_DOWN The four arrow keys ...
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KEY_UP
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KEY_LEFT
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KEY_RIGHT
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KEY_HOME Home key (upward+left arrow)
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KEY_BACKSPACE Backspace
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KEY_F0 Function keys; space for 64 keys is reserved.
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KEY_F(\fIn\fR) For 0 \fI<\fR \fIn\fR \fI<\fR 63
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KEY_DL Delete line
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KEY_IL Insert line
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KEY_DC Delete character
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KEY_IC Insert char or enter insert mode
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KEY_EIC Exit insert char mode
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KEY_CLEAR Clear screen
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KEY_EOS Clear to end of screen
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KEY_EOL Clear to end of line
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KEY_SF Scroll 1 line forward
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KEY_SR Scroll 1 line backward (reverse)
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KEY_NPAGE Next page
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KEY_PPAGE Previous page
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KEY_STAB Set tab
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KEY_CTAB Clear tab
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KEY_CATAB Clear all tabs
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KEY_ENTER Enter or send
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KEY_SRESET Soft (partial) reset
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KEY_RESET Reset or hard reset
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KEY_PRINT Print or copy
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KEY_LL Home down or bottom (lower left). Keypad is
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arranged like this:
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\fBA1\fR \fBup\fR \fBA3\fR
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\fBleft\fR \fBB2\fR \fBright\fR
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\fBC1\fR \fBdown\fR \fBC3\fR
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KEY_A1 Upper left of keypad
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KEY_A3 Upper right of keypad
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KEY_B2 Center of keypad
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KEY_C1 Lower left of keypad
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KEY_C3 Lower right of keypad
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KEY_BTAB Back tab key
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KEY_BEG Beg(inning) key
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KEY_CANCEL Cancel key
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KEY_CLOSE Close key
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KEY_COMMAND Cmd (command) key
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KEY_COPY Copy key
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KEY_CREATE Create key
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KEY_END End key
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KEY_EXIT Exit key
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KEY_FIND Find key
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KEY_HELP Help key
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KEY_MARK Mark key
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KEY_MESSAGE Message key
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KEY_MOVE Move key
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KEY_NEXT Next object key
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KEY_OPEN Open key
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KEY_OPTIONS Options key
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KEY_PREVIOUS Previous object key
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KEY_REDO Redo key
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KEY_REFERENCE Ref(erence) key
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KEY_REFRESH Refresh key
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KEY_REPLACE Replace key
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KEY_RESTART Restart key
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KEY_RESUME Resume key
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KEY_SAVE Save key
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KEY_SBEG Shifted beginning key
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KEY_SCANCEL Shifted cancel key
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KEY_SCOMMAND Shifted command key
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KEY_SCOPY Shifted copy key
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KEY_SCREATE Shifted create key
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KEY_SDC Shifted delete char key
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KEY_SDL Shifted delete line key
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KEY_SELECT Select key
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KEY_SEND Shifted end key
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KEY_SEOL Shifted clear line key
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KEY_SEXIT Shifted exit key
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KEY_SFIND Shifted find key
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KEY_SHELP Shifted help key
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KEY_SHOME Shifted home key
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KEY_SIC Shifted input key
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KEY_SLEFT Shifted left arrow key
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KEY_SMESSAGE Shifted message key
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KEY_SMOVE Shifted move key
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KEY_SNEXT Shifted next key
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KEY_SOPTIONS Shifted options key
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KEY_SPREVIOUS Shifted prev key
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KEY_SPRINT Shifted print key
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KEY_SREDO Shifted redo key
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KEY_SREPLACE Shifted replace key
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KEY_SRIGHT Shifted right arrow
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KEY_SRSUME Shifted resume key
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KEY_SSAVE Shifted save key
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KEY_SSUSPEND Shifted suspend key
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KEY_SUNDO Shifted undo key
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KEY_SUSPEND Suspend key
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KEY_UNDO Undo key
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.fi
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.SH RETURN VALUE
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All routines return the integer \fBERR\fR upon failure and an integer
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value other than \fBERR\fR upon successful completion.
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.SH NOTES
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Use of the escape key by a programmer for a single character function is
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discouraged, as it will cause a delay of up to one second while the
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keypad code looks for a following function-key sequence.
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When using \fBgetch\fR, \fBwgetch\fR, \fBmvgetch\fR, or
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\fBmvwgetch\fR, nocbreak mode (\fBnocbreak\fR) and echo mode
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(\fBecho\fR) should not be used at the same time. Depending on the
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state of the tty driver when each character is typed, the program may
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produce undesirable results.
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Note that \fBgetch\fR, \fBmvgetch\fR, and \fBmvwgetch\fR may be macros.
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Historically, the set of keypad macros was largely defined by the extremely
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function-key-rich keyboard of the AT&T 7300, aka 3B1, aka Safari 4. Modern
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personal computers usually have only a small subset of these. IBM PC-style
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consoles typically support little more than \fBKEY_UP\fR, \fBKEY_DOWN\fR,
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\fBKEY_LEFT\fR, \fBKEY_RIGHT\fR, \fBKEY_HOME\fR, \fBKEY_END\fR,
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\fBKEY_NPAGE\fR, \fBKEY_PPAGE\fR, and function keys 1 through 12. The Ins key
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is usually mapped to \fBKEY_IC\fR.
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.SH CAPABILITIES
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All of the key_* capabilities; also \fBkeypad_local\fR and \fBkeypad_xmit\fR.
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.SH SEE ALSO
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\fBncurses\fR(3X), \fBcurs_inopts\fR(3X), \fBcurs_move\fR(3X),
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\fBcurs_refresh\fR(3X).
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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