49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include "../util.h"
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/*
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* fmt consists of uppercase or lowercase 'c' for caps lock and/or 'n' for num
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* lock, each optionally followed by '?', in the order of indicators desired.
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* If followed by '?', the letter with case preserved is included in the output
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* if the corresponding indicator is on. Otherwise, the letter is always
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* included, lowercase when off and uppercase when on.
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*/
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const char *
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keyboard_indicators(const char *fmt)
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{
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Display *dpy;
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XKeyboardState state;
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size_t fmtlen, i, n;
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int togglecase, isset;
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char key;
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if (!(dpy = XOpenDisplay(NULL))) {
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warn("XOpenDisplay: Failed to open display");
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return NULL;
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}
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XGetKeyboardControl(dpy, &state);
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XCloseDisplay(dpy);
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fmtlen = strnlen(fmt, 4);
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for (i = n = 0; i < fmtlen; i++) {
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key = tolower(fmt[i]);
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if (key != 'c' && key != 'n') {
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continue;
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}
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togglecase = (i + 1 >= fmtlen || fmt[i + 1] != '?');
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isset = (state.led_mask & (1 << (key == 'n')));
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if (togglecase) {
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buf[n++] = isset ? toupper(key) : key;
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} else if (isset) {
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buf[n++] = fmt[i];
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}
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}
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buf[n] = 0;
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return buf;
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}
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