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This terminal cannot do colors.
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Also See
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FALSE
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Appendix A
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NCurses Library Reference
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typeahead()
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The typeahead() function controls NCurses typeahead feature (see the next section) and determines which input source to monitor for typeahead.
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Explanation
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typeahead is an internal feature NCurses uses to optimize input. When there is keyboard activity during a screen update, NCurses suspends the update to immediately process the keyboard input, specifically if the input is coming from a tty. The next refresh() or doupdate() call then completes the screen update. The typeahead() function allows you to specify which input source to monitor for typeahead or whether typeahead should be disabled.
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Man Page Format
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int typeahead(int fd);
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Format Reference
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fd is a file descriptor or FILE type variable, such as stdin. It specifies the input source typeahead monitors. When the value -1 is specified, then typeahead is disabled.
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Return Value
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OK upon success or ERR on failure.
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Notes
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The file value typeahead() normally uses depends on how NCurses was started. When initscr() is used, then the default value is stdin, standard input. When newterm() is used, then default input is set as the third argument (see newtertm()). The typeahead feature does disrupt screen updates. If you d rather have your program always and completely update the screen whenever refresh() or doupdate() is called, then specify typeahead(-1).
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Appendix A
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NCurses Library Reference
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Examples
typeahead(-1);
The statement disables NCurses typeahead optimization during a screen refresh.
typeahead(stdio);
Here, NCurses typeahead is set for standard input, most likely to restore typeahead after being disabled.
Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 #include <ncurses.h> int main(void) { initscr(); typeahead(-1);
/* Disable typeahead */
addstr( All this text will be put to the screen without a\n ); addstr( keyboard interruption. ); refresh(); getch(); endwin(); return 0; }
Sample output:
All this text will be put to the screen without a keyboard interruption.
Refreshing takes place so quickly on x-terminals that you d really need to hook up a remote terminal, set it to something slow, and then test this function to really see the results.
Also See
newterm(), flushinp(), intrflush()
unctrl()
The unctrl() function is used primarily to convert control codes to a displayable string using the ^c format, where ^ is the control prefix and c is a letter or symbol corresponding to the code.
Appendix A
NCurses Library Reference
Man Page Format
char *unctrl(chtype c);
Format Reference
c is a chtype character representing a character or code plus optional formatting attributes.
Return Value
unctrl() returns a pointer to a character array (string) representing the character or code c. For displayable characters, the character itself is returned in the string. For control codes, the code letter prefixed by a ^ is returned. See Notes. On error, NULL is returned.
Notes
Though the ch argument is a chtype and may contain formatting attributes, any attributes present are ignored by the unctrl() function. Table A-18 references the ASCII control codes, 0 through 32 plus code 127.
Table A-18: Control keys and codes VALUE HEX 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b VALUE DEC 0 1 2 3 4 5 6 7 8 9 11 12 CHAR ^@ ^A ^B ^C ^D ^E ^F ^G ^H ^I ^J ^K CODE NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT MEANING Null Start Of Heading Start Of Text End Of Text End Of Transmission Enquiry Acknowledge Bell Backspace Horizontal Tab Line Feed Vertical Tab (continued)
Appendix A
NCurses Library Reference
Table A-18 (continued) VALUE HEX 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f 0x7f VALUE DEC 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 127 CHAR ^L ^M ^N ^O ^P ^Q ^R ^S ^T ^U ^V ^W ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ ^ CODE FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US DEL MEANING Form Feed Carriage Return Shift Out Shift In Data Link Escape Device Control 1 Device Control 2 Device Control 3 Device Control 4 Negative Acknowledge Synchronous idle End Transmission Block Cancel End of Medium Substitute Escape Form Separator Group Separator Record Separator Unit Separator Delete
In some localities, codes 0x80 through 0x8f are represented as shown in the table, but prefixed by the ~ (tilde). Code 0xff is displayed by unctrl() as ~ .