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/*
** KBFLIP.C
**
** a public domain demo by: Bob Stout
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <process.h>
#ifdef __TURBOC__
#define FAR far
#else
#define FAR _far
#endif
#define SHOW(str) fputs(str"\n", stderr)
#define BitSet(arg,posn) ((arg) | (1L << (posn)))
#define BitClr(arg,posn) ((arg) & ~(1L << (posn)))
#define LOCKS_POSN 4
#define BYTE unsigned char
BYTE FAR *kb_status = (BYTE FAR *) 0x00400017;
/*
** Tell the folks how this works
*/
void usage(void)
{
SHOW("Usage: KBFLIP {+|-}[switches] [...{+|-}[switches]]");
SHOW("Where \"switches\" are one or more of:");
SHOW(" +/-C - Turn Caps Lock on/off");
SHOW(" +/-N - Turn Num Lock on/off");
SHOW(" +/-S - Turn Scroll Lock on/off");
SHOW("Note switches may be upper or lower case\n");
SHOW("Example: \"KBFLIP +Cn -S\" turns Caps Lock and Num Lock on "
"and Scroll lock off");
exit(-1);
}
/*
** The real works starts here
**
** This works by checking the user input against a string containing the
** allowable switch characters in the same relative positions they
** occupy in the BIOS data area, offset by 4 (LOCKS_POSN).
**
** Note that all changes are made to a copy of the BIOS data so any
** input errors will not cause incomplete changes to be applied.
*/
int main(int argc, char *argv[])
{
int i, j;
char *args = "SNC";
BYTE template = *kb_status; /* Make changes to copy */
if (2 > argc) /* Help 'em */
usage();
for (i = 1; i < argc; ++i)
{
if (NULL == strchr("+-", *argv[i]))
usage();
for (j = 1; argv[i][j]; ++j)
{
char *found;
if (NULL != (found = strchr(args, toupper(argv[i][j]))))
{
int posn = LOCKS_POSN + (found - args);
if ('+' == *argv[i])
template = (BYTE)BitSet(template, posn);
else template = (BYTE)BitClr(template, posn);
}
else usage();
}
}
*kb_status = template; /* Apply all changes */
return(0);
}
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