/* clear_undo_stack: clear the undo stack */
void
clear_undo_stack(void)
{
line_t *lp, *ep, *tl;
while (u_p--)
if (ustack[u_p].type == UDEL) {
ep = ustack[u_p].t->q_forw;
for (lp = ustack[u_p].h; lp != ep; lp = tl) {
unmark_line_node(lp);
tl = lp->q_forw;
free(lp);
}
}
u_p = 0;
u_current_addr = current_addr;
u_addr_last = addr_last;
}
void clear_undo_stack( void )
{
while( u_ptr-- )
if( ustack[u_ptr].type == UDEL )
{
line_t * const ep = ustack[u_ptr].tail->q_forw;
line_t * bp = ustack[u_ptr].head;
while( bp != ep )
{
line_t * const lp = bp->q_forw;
unmark_line_node( bp );
free( bp );
bp = lp;
}
}
u_ptr = 0;
u_current_addr = current_addr_;
u_last_addr = last_addr_;
u_modified = modified_;
}