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Avoid using stack.

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This commit is contained in:
Ondrej Filip 2011-03-27 23:27:37 +02:00
parent 4e712ec3b7
commit c454872f4e
1 changed files with 6 additions and 4 deletions
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10
filter/config.Y
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@ -27,15 +27,17 @@ static int make_pair(int i1, int i2)
struct f_tree *f_generate_rev_wcard(int from, int to, int expr)
{
struct f_tree * ret = NULL;
if(from <= to) {
struct f_tree *ret = NULL, *last = NULL;
while (from <= to) {
ret = f_new_tree();
ret->from.type = ret->to.type = T_PAIR;
ret->from.val.i = ret->to.val.i = make_pair(from, expr);
ret->left = f_generate_rev_wcard(from+1, to, expr);
ret->left = last;
from++; last = ret;
}
return ret;
}
CF_DECLS