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implement locate_cursor() #1692

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nick black 2021-07-10 22:50:52 -04:00 committed by nick black
parent e133225092
commit bd451aa087
1 changed files with 36 additions and 0 deletions
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36
src/lib/termdesc.c
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@ -839,6 +839,42 @@ int cursor_yx_get(int ttyfd, const char* u7, int* y, int* x){
return 0;
}
// send a u7 request, and wait until we have a cursor report
int locate_cursor(tinfo* ti, int fd, int* cursor_y, int* cursor_x){
if(fd < 0){
logwarn("Can't request on fd %d\n", fd);
return -1;
}
const char* u7 = get_escape(ti, ESCAPE_DSRCPR);
if(u7 == NULL){
logwarn("No support in terminfo\n");
return -1;
}
bool emitted_u7 = false; // only want to send one max
cursorreport* clr;
pthread_mutex_lock(&ti->input.creport_lock);
while((clr = ti->input.creport_queue) == NULL){
if(!emitted_u7){
// FIXME i'd rather not do this while holding the lock =[
if(tty_emit(u7, fd)){
pthread_mutex_unlock(&ti->input.creport_lock);
return -1;
}
emitted_u7 = true;
}
pthread_cond_wait(&ti->input.creport_cond, &ti->input.creport_lock);
}
pthread_mutex_unlock(&ti->input.creport_lock);
*cursor_y = clr->y;
*cursor_x = clr->x;
if(ti->inverted_cursor){
int tmp = *cursor_y;
*cursor_y = *cursor_x;
*cursor_x = tmp;
}
return 0;
}
int locate_cursor_early(struct notcurses* nc, int* cursor_y, int* cursor_x){
int ret = 0;
if(nc->ttyfd >= 0){