83 lines
2.0 KiB
Plaintext
83 lines
2.0 KiB
Plaintext
/* This function changes a key's action and saves the old one
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* in an integer you pass in by reference:
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*/
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#include <sys/ioctl.h>
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#include <linux/kd.h>
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#include <linux/keyboard.h>
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#include <stdio.h>
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int set_kb_entry( unsigned short table, unsigned short keycode,
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unsigned short value, unsigned short *oldvalue ) {
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struct kbentry ke;
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ke.kb_table = table;
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ke.kb_index = keycode;
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/* Get old value, return error if table or keycode are duff */
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if( ioctl( fileno(stdin), KDGKBENT, &ke ) )
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return -1;
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/* Unless oldvalue ptr is NULL, save old value to restore later */
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if( oldvalue ) *oldvalue = ke.kb_value;
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/* The new action for this key */
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ke.kb_value = value;
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/* Do the business, return error if value is duff */
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if( ioctl( fileno(stdin), KDSKBENT, &ke ) )
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return -1;
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return 0;
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}
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/* To use the above function to disable scrollback and
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* restore it on exit:
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*/
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#include <stdlib.h>
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/* Old key action values will be stored in these */
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unsigned short scroll_forward = 0;
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unsigned short scroll_backward = 0;
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/* The magic numbers gleaned from dumpkeys and loadkeys -m */
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#define SHIFT_TABLE 1
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#define PAGE_UP_KEYCODE 104
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#define PAGE_DOWN_KEYCODE 109
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#define PAGE_UP_ACTION 0x0118 /* Prior */
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#define PAGE_DOWN_ACTION 0x0119 /* Next */
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/* Restore default funcs for shift-PageUp and shift-PageDown */
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static void restore_scrollback() {
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if( scroll_backward )
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set_kb_entry( SHIFT_TABLE, PAGE_UP_KEYCODE,
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scroll_backward, 0 );
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if( scroll_forward )
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set_kb_entry( SHIFT_TABLE, PAGE_DOWN_KEYCODE,
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scroll_forward, 0 );
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}
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/* Liberate shift-PageUp and shift-PageDown for normal use */
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int disable_scrollback() {
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if( set_kb_entry( SHIFT_TABLE, PAGE_UP_KEYCODE,
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PAGE_UP_ACTION, &scroll_backward ) )
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return -1;
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if( set_kb_entry( SHIFT_TABLE, PAGE_DOWN_KEYCODE,
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PAGE_DOWN_ACTION, &scroll_forward ) )
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return -1;
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atexit( restore_scrollback );
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return 0;
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}
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