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#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <fuse3/fuse.h>
#include <xcb/xcb.h>
#include <xcb/xcb_util.h>
struct selection
{
const char * name;
uint32_t len;
char * data;
xcb_atom_t atom;
};
int get_selection_index(const char *);
xcb_window_t find_owner(int);
void update_selection(int);
xcb_atom_t get_atom(xcb_connection_t *, const char *);
int clip_getattr(const char *, struct stat *, struct fuse_file_info *);
int clip_readdir(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *, enum fuse_readdir_flags);
int clip_open(const char *, struct fuse_file_info *);
int clip_read(const char *, char *, size_t, off_t, struct fuse_file_info *);
const uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
const uint32_t values[] = {1, XCB_EVENT_MASK_PROPERTY_CHANGE};
const struct fuse_operations clip_ops = {
.getattr = clip_getattr,
.readdir = clip_readdir,
.open = clip_open,
.read = clip_read,
};
static xcb_connection_t * c;
static xcb_screen_t * s;
static xcb_window_t w;
static struct selection x[] = {
{.name = "primary", .len = 0, .data = NULL},
{.name = "secondary", .len = 0, .data = NULL},
{.name = "clipboard", .len = 0, .data = NULL},
};
int main(int argc, char ** argv)
{
c = xcb_connect(NULL, NULL);
s = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
w = xcb_generate_id(c);
xcb_create_window(
c, XCB_COPY_FROM_PARENT, w, s->root, 0, 0, 1, 1, 0, XCB_COPY_FROM_PARENT, s->root_visual, mask, values);
xcb_flush(c);
x[0].atom = get_atom(c, "PRIMARY");
x[1].atom = get_atom(c, "SECONDARY");
x[2].atom = get_atom(c, "CLIPBOARD");
fuse_main(argc, argv, &clip_ops, NULL);
xcb_disconnect(c);
}
int get_selection_index(const char * path)
{
for (int i = 0; i < 3; ++i)
if (0 == strcmp(path + 1, x[i].name))
return i;
return -ENOENT;
}
xcb_window_t find_owner(const int i)
{
xcb_get_selection_owner_cookie_t cookie = xcb_get_selection_owner(c, x[i].atom);
xcb_get_selection_owner_reply_t * reply = xcb_get_selection_owner_reply(c, cookie, NULL);
xcb_window_t owner = XCB_WINDOW_NONE;
if (reply)
owner = reply->owner;
free(reply);
return owner;
}
void update_selection(const int i)
{
xcb_atom_t TARGET_PROPERTY = get_atom(c, "_TARGET_SELECTION");
xcb_atom_t UTF8_STRING = get_atom(c, "UTF8_STRING"); // TODO: Look into ways to support various TARGETS.
if (XCB_WINDOW_NONE == find_owner(i))
return;
xcb_convert_selection(c, w, x[i].atom, UTF8_STRING, TARGET_PROPERTY, XCB_CURRENT_TIME);
xcb_flush(c);
xcb_generic_event_t * e;
int done = 0; // TODO: Look into continuous notifications.
while (!done)
{
e = xcb_wait_for_event(c);
if (NULL == e) return;
if (XCB_SELECTION_NOTIFY != XCB_EVENT_RESPONSE_TYPE(e))
{
free(e);
continue;
}
xcb_selection_notify_event_t * n = (xcb_selection_notify_event_t *) e;
if (x[i].atom == n->selection && XCB_NONE != n->property)
{
xcb_get_property_cookie_t pcookie = xcb_get_property(
c, 0, w, TARGET_PROPERTY, XCB_ATOM_ANY, 0, UINT32_MAX);
xcb_get_property_reply_t * reply = xcb_get_property_reply(c, pcookie, NULL);
if (reply)
{
const int len = xcb_get_property_value_length(reply);
x[i].data = realloc(x[i].data, len);
if (NULL == x[i].data)
x[i].len = 0;
x[i].len = len;
memcpy(x[i].data, xcb_get_property_value(reply), len);
xcb_delete_property(c, n->requestor, n->property);
done = 1;
free(reply);
}
}
free(e);
}
}
xcb_atom_t get_atom(xcb_connection_t * c, const char * name)
{
xcb_intern_atom_cookie_t cookie = xcb_intern_atom(c, 0, strlen(name), name);
xcb_intern_atom_reply_t * reply = xcb_intern_atom_reply(c, cookie, NULL);
xcb_atom_t atom = reply->atom;
free(reply);
return atom;
}
int clip_getattr(const char * path, struct stat * st, struct fuse_file_info * fi)
{
(void) fi;
memset(st, 0, sizeof(struct stat));
if (0 == strcmp(path, "/"))
{
st->st_mode = S_IFDIR | 0755;
st->st_nlink = 2;
}
else
{
const int i = get_selection_index(path);
if (-ENOENT == i)
return -ENOENT;
update_selection(i); // TODO: The content is updated way too often.
st->st_mode = S_IFREG | 0444;
st->st_nlink = 1;
st->st_size = x[i].len;
}
return 0;
}
int clip_readdir(
const char * path, void * buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info * fi,
enum fuse_readdir_flags flags)
{
(void) offset;
(void) fi;
(void) flags;
if (0 != strcmp(path, "/"))
return -ENOENT;
filler(buf, ".", NULL, 0, 0);
filler(buf, "..", NULL, 0, 0);
for (int i = 0; i < 3; ++i)
filler(buf, x[i].name, NULL, 0, 0);
return 0;
}
int clip_open(const char * path, struct fuse_file_info * fi)
{
if (-ENOENT == get_selection_index(path))
return -ENOENT;
if (O_RDONLY != (fi->flags & O_ACCMODE))
return -EACCES;
return 0; // TODO: Maybe queue selection content retrieval here?
}
int clip_read(const char * path, char * buf, size_t size, off_t offset, struct fuse_file_info * fi)
{
(void) fi;
const int i = get_selection_index(path);
if (-ENOENT == i)
return -ENOENT;
update_selection(i); // TODO: The content is updated way too often.
if (offset < x[i].len)
{
if (offset + size > x[i].len)
size = x[i].len - offset;
memcpy(buf, x[i].data + offset, size);
}
else
size = 0;
return size;
}
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