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"
#define LAYOUT_MAX 256
/* Given a token (sym) from the xkb_symbols string
* check whether it is a valid layout/variant. The
* EXCLUDES array contains invalid layouts/variants
* that are part of the xkb rules config.
*/
static int
IsLayoutOrVariant(char *sym)
{
static const char* EXCLUDES[] = { "evdev", "inet", "pc", "base" };
size_t i;
for (i = 0; i < sizeof(EXCLUDES)/sizeof(EXCLUDES[0]); ++i) {
if (strstr(sym, EXCLUDES[i])) {
return 0;
}
}
return 1;
}
static void
GetKeyLayout(char *syms, char layout[], int groupNum)
{
char *token, *copy, *delims;
int group;
delims = "+:";
group = 0;
copy = strdup(syms);
token = strtok(copy, delims);
while (token != NULL && group <= groupNum) {
/* Ignore :2,:3,:4 which represent additional layout
* groups
*/
if (IsLayoutOrVariant(token)
&& !(strlen(token) == 1 && isdigit(token[0]))) {
strncpy (layout, token, LAYOUT_MAX);
group++;
}
token = strtok(NULL,delims);
}
free(copy);
}
const char *
keymap(void)
{
static char layout[LAYOUT_MAX];
Display *dpy;
char *symbols = NULL;
XkbDescRec* desc = NULL;
memset(layout, '\0', LAYOUT_MAX);
if (!(dpy = XOpenDisplay(NULL))) {
warn("XOpenDisplay: Failed to open display");
return NULL;
}
;
if (!(desc = XkbAllocKeyboard())) {
warn("XkbAllocKeyboard: failed to allocate keyboard");
XCloseDisplay(dpy);
return NULL;
}
XkbGetNames(dpy, XkbSymbolsNameMask, desc);
if (desc->names) {
XkbStateRec state;
XkbGetState(dpy, XkbUseCoreKbd, &state);
symbols = XGetAtomName(dpy, desc->names->symbols);
GetKeyLayout(symbols, layout, state.group);
XFree(symbols);
} else {
warn("XkbGetNames: failed to retrieve symbols for keys");
return NULL;
}
XkbFreeKeyboard(desc, XkbSymbolsNameMask, 1);
XCloseDisplay(dpy);
return layout;
}