/*
* Save a reverse delta for doing undo.
*/
void
undo_save (int type, Point pt, size_t osize, size_t size)
{
Undo *up;
if (get_buffer_noundo (cur_bp) || undo_nosave)
return;
up = (Undo *) XZALLOC (Undo);
up->type = type;
up->n = pt.n;
up->o = pt.o;
if (!get_buffer_modified (cur_bp))
up->unchanged = true;
if (type == UNDO_REPLACE_BLOCK)
{
Line * lp = get_buffer_pt (cur_bp).p;
size_t n = get_buffer_pt (cur_bp).n;
if (n > pt.n)
do
lp = get_line_prev (lp);
while (--n > pt.n);
else if (n < pt.n)
do
lp = get_line_next (lp);
while (++n < pt.n);
pt.p = lp;
up->block.osize = osize;
up->block.size = size;
up->block.text = copy_text_block (pt, osize);
}
up->next = get_buffer_last_undop (cur_bp);
set_buffer_last_undop (cur_bp, up);
if (!doing_undo)
set_buffer_next_undop (cur_bp, up);
}
bool
find_file (const char *filename)
{
Buffer bp;
for (bp = head_bp; bp != NULL; bp = get_buffer_next (bp))
if (get_buffer_filename (bp) != NULL &&
STREQ (get_buffer_filename (bp), filename))
break;
if (bp == NULL)
{
if (exist_file (filename) && !is_regular_file (filename))
{
minibuf_error ("File exists but could not be read");
return false;
}
else
{
bp = buffer_new ();
set_buffer_names (bp, filename);
set_buffer_dir (bp, astr_new_cstr (dir_name (filename)));
estr es = estr_readf (filename);
if (es)
set_buffer_readonly (bp, !check_writable (filename));
else
es = estr_new_astr (astr_new ());
set_buffer_text (bp, es);
/* Reset undo history. */
set_buffer_next_undop (bp, NULL);
set_buffer_last_undop (bp, NULL);
set_buffer_modified (bp, false);
}
}
switch_to_buffer (bp);
thisflag |= FLAG_NEED_RESYNC;
return true;
}
