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	keyboard_indicators.c - slstatus - status monitor
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	keyboard_indicators.c (1238B)
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	1 /* See LICENSE file for copyright and license details. */
	2 #include <ctype.h>
	3 #include <stdio.h>
	4 #include <string.h>
	5 #include <X11/Xlib.h>
	6
	7 #include "../slstatus.h"
	8 #include "../util.h"
	9
	10 /*
	11 * fmt consists of uppercase or lowercase 'c' for caps lock and/or 'n' f…
	12 * lock, each optionally followed by '?', in the order of indicators des…
	13 * If followed by '?', the letter with case preserved is included in the…
	14 * if the corresponding indicator is on. Otherwise, the letter is always
	15 * included, lowercase when off and uppercase when on.
	16 */
	17 const char *
	18 keyboard_indicators(const char *fmt)
	19 {
	20 Display *dpy;
	21 XKeyboardState state;
	22 size_t fmtlen, i, n;
	23 int togglecase, isset;
	24 char key;
	25
	26 if (!(dpy = XOpenDisplay(NULL))) {
	27 warn("XOpenDisplay: Failed to open display");
	28 return NULL;
	29 }
	30 XGetKeyboardControl(dpy, &state);
	31 XCloseDisplay(dpy);
	32
	33 fmtlen = strnlen(fmt, 4);
	34 for (i = n = 0; i < fmtlen; i++) {
	35 key = tolower(fmt[i]);
	36 if (key != 'c' && key != 'n')
	37 continue;
	38
	39 togglecase = (i + 1 >= fmtlen \|\| fmt[i + 1] != '?');
	40 isset = (state.led_mask & (1 << (key == 'n')));
	41
	42 if (togglecase)
	43 buf[n++] = isset ? toupper(key) : key;
	44 else if (isset)
	45 buf[n++] = fmt[i];
	46 }
	47
	48 buf[n] = 0;
	49 return buf;
	50 }