01-28-2005
#include <stdio.h>
/* character input */
int fgetc(FILE *stream);
int getc(FILE *stream);
int getchar(void);
int ungetc(int c, FILE *stream);
These read an unsigned char from the input stream where specified, or otherwise stdin. In each case, the next character is obtained from the input stream. It is treated as an unsigned char and converted to an int, which is the return value. On End of File, the constant EOF is returned, and the end-of-file indicator is set for the associated stream. On error, EOF is returned, and the error indicator is set for the associated stream. Successive calls will obtain characters sequentially. The functions, if implemented as macros, may evaluate their stream argument more than once, so do not use side effects here.
There is also the supporting ungetc routine, which is used to push back a character on to a stream, causing it to become the next character to be read. This is not an output operation and can never cause the external contents of a file to be changed. A fflush, fseek, or rewind operation on the stream between the pushback and the read will cause the pushback to be forgotten. Only one character of pushback is guaranteed, and attempts to pushback EOF are ignored. In every case, pushing back a number of characters then reading or discarding them leaves the file position indicator unchanged. The file position indicator is decremented by every successful call to ungetc for a binary stream, but unspecified for a text stream, or a binary stream which is positioned at the beginning of the file.
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LEARN ABOUT SUSE
keyboard_translatekeys
keyboard_translatekeys(3) Svgalib User Manual keyboard_translatekeys(3)
NAME
keyboard_translatekeys - modify scancode mappings in raw keyboard mode
SYNOPSIS
#include <vgakeyboard.h>
void keyboard_translatekeys(int mask);
DESCRIPTION
This function sets several flags which control how certain scancodes are mapped. At startup a mask value of 0 is active.
mask must be a logical or of zero or more of the following #predefined integers to turn the features listed on:
TRANSLATE_CURSORKEYS
Translate the scancodes of the SCANCODE_CURSORBLOCK* keys to those of the cursor keys on the number pad, s.t. keyboard_getstate(3)
and keyboard_keypressed(3) report a keypress of the corresponding number pad cursor key and not the one on the cursor block.
TRANSLATE_DIAGONAL
Translates the scancodes of diagonal cursor keys (keypad 7, 9, 1, 3) to presses of two of the ordinary up, down, left, right keys.
For example, instead of reporting a press of SCANCODE_CURSORUPRIGHT keyboard_getstate(3) and keyboard_keypressed(3) report a simul-
taneous press of SCANCODE_CURSORUP and SCANCODE_CURSORRIGHT.
TRANSLATE_KEYPADENTER
The scancode of the keypad enter key is mapped to that of the ordinary enter key, s.t. keyboard_getstate(3) and keyboard_key-
pressed(3) report a press of SCANCODE_ENTER regardless if keypad enter or ordinary enter is pressed.
DONT_CATCH_CTRLC
Pressing <Ctrl>-C does not raise a SIGINT. On contrary to the other flags this has also effect when a user defined keyboard event
handler is used. Svgalib will always process <Alt>-F1 - <Alt>-F10 and perform console switches accordingly.
BUGS
The TRANSLATE_* options above do really do simple scancode translations. For example, when TRANSLATE_KEYPADENTER is active and the user
presses both enter and keypad enter. Then, if he releases one of them (say keypad enter), it's release event will clear the common keyboard
state, s.t. no keypress is reported even though enter is still pressed.
Similarly, if TRANSLATE_DIAGONAL is active, the user holds cursor upleft (keypad 7) down and then presses and release cursor up (keypad 8),
svgalib will only report a pressed cursor left but the simulated cursor up will be lost. You can easily try this with the keytest(6) demo
to make the effect more clear to you.
SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), keytest(6), eventtest(6), keyboard_seteventhandler(3), keyboard_init(3), key-
board_init_return_fd(3), keyboard_close(3), keyboard_update(3), keyboard_waitforupdate(3), keyboard_setdefaulteventhandler(3), key-
board_getstate(3), keyboard_clearstate(3), keyboard_keypressed(3), vga_waitevent(3)
AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
to this first version of the svgalib manual.
Svgalib (>= 1.2.11) 29 July 1997 keyboard_translatekeys(3)