components/keymap.c
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/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <X11/XKBlib.h>
#include <X11/Xlib.h>
#include "../util.h"
static int
valid_layout_or_variant(char *sym)
{
size_t i;
/* invalid symbols from xkb rules config */
static const char *invalid[] = { "evdev", "inet", "pc", "base" };
for (i = 0; i < LEN(invalid); i++) {
if (!strncmp(sym, invalid[i], strlen(invalid[i]))) {
return 0;
}
}
return 1;
}
static char *
get_layout(char *syms, int grp_num)
{
char *tok, *layout;
int grp;
layout = NULL;
tok = strtok(syms, "+:");
for (grp = 0; tok && grp <= grp_num; tok = strtok(NULL, "+:")) {
if (!valid_layout_or_variant(tok)) {
continue;
} else if (strlen(tok) == 1 && isdigit(tok[0])) {
/* ignore :2, :3, :4 (additional layout groups) */
continue;
}
layout = tok;
grp++;
}
return layout;
}
const char *
keymap(void)
{
Display *dpy;
XkbDescRec *desc;
XkbStateRec state;
char *symbols, *layout;
layout = NULL;
if (!(dpy = XOpenDisplay(NULL))) {
warn("XOpenDisplay: Failed to open display");
return NULL;
}
if (!(desc = XkbAllocKeyboard())) {
warn("XkbAllocKeyboard: Failed to allocate keyboard");
goto end;
}
if (XkbGetNames(dpy, XkbSymbolsNameMask, desc)) {
warn("XkbGetNames: Failed to retrieve key symbols");
goto end;
}
if (XkbGetState(dpy, XkbUseCoreKbd, &state)) {
warn("XkbGetState: Failed to retrieve keyboard state");
goto end;
}
if (!(symbols = XGetAtomName(dpy, desc->names->symbols))) {
warn("XGetAtomName: Failed to get atom name");
goto end;
}
layout = (char *)bprintf("%s", get_layout(symbols, state.group));
XFree(symbols);
end:
XkbFreeKeyboard(desc, XkbSymbolsNameMask, 1);
if (XCloseDisplay(dpy)) {
warn("XCloseDisplay: Failed to close display");
}
return layout;
}