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/*
xkbcat
------
Monitors key presses globally across X11.
*/
#include <X11/Xlib.h>
#include <X11/X.h>
#include <X11/XKBlib.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
char * DEFAULT_DISPLAY = ":0";
const int DEFAULT_DELAY = 10000000;
const bool DEFAULT_PRINT_UP = false;
static inline int BIT(char *c, int x) { return ( c[x/8]& (1<<(x%8)) ); }
const int KEYSYM_STRLEN = 64;
char *keyPressToString(Display *disp, int code, bool down);
int printUsage() {
printf("\
USAGE: xkbcat [-display <display>] [-delay <nanosec>] [-up]\n\
display target X display (default %s)\n\
delay polling frequency; nanoseconds (default %d)\n\
up also print key-ups (default %s)\n",
DEFAULT_DISPLAY, DEFAULT_DELAY, (DEFAULT_PRINT_UP ? "yes" : "no") );
exit(0);
}
int main(int argc, char *argv[]) {
char *hostname = DEFAULT_DISPLAY,
*char_ptr,
buf1[32], buf2[32],
*keys,
*saved;
int delay = DEFAULT_DELAY;
bool printKeyUps = DEFAULT_PRINT_UP;
// Get args
for (int i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-help")) printUsage();
else if (!strcmp(argv[i], "-display")) hostname = argv[++i];
else if (!strcmp(argv[i], "-delay")) delay = atoi(argv[++i]);
else if (!strcmp(argv[i], "-up")) printKeyUps = true;
else printUsage();
}
// Setup Xwindows
Display *disp = XOpenDisplay(hostname);
if (NULL == disp) {
fprintf(stderr, "Cannot open X display: %s\n", hostname);
exit(1);
}
XSynchronize(disp, true);
// Setup buffers
saved = buf1; keys=buf2;
XQueryKeymap(disp, saved);
struct timespec sleepTime = { .tv_nsec = delay };
while (1) {
// find changed keys
XQueryKeymap(disp, keys);
for (int i = 0; i < 32*8; i++) {
if (BIT(keys, i) != BIT(saved, i)) {
register char *str = keyPressToString(disp, i, BIT(keys, i));
if (BIT(keys, i) != 0 || printKeyUps) printf("%s\n",str);
fflush(stdout); // In case user is writing to a pipe
}
}
// Swap buffers
char_ptr = saved;
saved = keys;
keys = char_ptr;
nanosleep(&sleepTime, NULL);
}
}
/*
Have a keycode, Look up keysym for it.
Convert keysym into its string representation.
Put it as (+string) or (-string), depending on if it's up or down.
Print out the string.
*/
char *keyPressToString(Display *disp, int code, bool down) {
static char *str, buf[KEYSYM_STRLEN + 1];
KeySym keysym = XkbKeycodeToKeysym(disp, code, 0, 0);
if (NoSymbol == keysym) return "";
// Convert keysym to a string, copy it to a local area
str = XKeysymToString(keysym);
if (NULL == str) return "";
strncpy(buf, str, KEYSYM_STRLEN); buf[KEYSYM_STRLEN] = 0;
// Still a string, so put it in form (+str) or (-str)
if (down) strcpy(buf, "+ ");
else strcpy(buf, "- ");
strcat(buf, str);
return buf;
}
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