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detect_cursor_inversion: handle upper right corner case #784

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nick black 2020-09-06 17:05:56 -04:00 committed by Nick Black
parent 7026470e1a
commit f836938ad2
1 changed files with 17 additions and 7 deletions
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24
src/lib/direct.cpp
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@ -222,20 +222,30 @@ detect_cursor_inversion(ncdirect* n, int rows, int cols, int* y, int* x){
if(cursor_yx_get(n->ctermfd, y, x)){
return -1;
}
if(ncdirect_cursor_right(n, 1) || ncdirect_cursor_up(n, 1) || fflush(n->ttyfp) == EOF){
if(*x == cols && *y == 1){
if(ncdirect_cursor_down(n, 1) || ncdirect_cursor_left(n, 1)){
return -1;
}
}else{
if(ncdirect_cursor_right(n, 1) || ncdirect_cursor_up(n, 1)){
return -1;
}
}
if(fflush(n->ttyfp) == EOF){
return -1;
}
int newy, newx;
if(cursor_yx_get(n->ctermfd, &newy, &newx)){
return -1;
}
fprintf(stderr, "NEW: %d/%d OLD: %d/%d\n", newy, newx, *y, *x);
if(*x == cols && *y == 1){ // need to swap values, since we moved opposite
*x = newx;
newx = cols;
*y = newy;
newy = 1;
}
if(*y == newy && *x == newx){
if(newx == cols && newy == 1){
// FIXME retry, or just move down and left
}else{
return -1;
}
return -1; // hopelessly broken
}else if(*x == newx){
// we only changed one, supposedly the number of rows. if we were on the
// top row before, the reply is inverted.