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Avoid using stack.
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4e712ec3b7
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@ -27,15 +27,17 @@ static int make_pair(int i1, int i2)
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struct f_tree *f_generate_rev_wcard(int from, int to, int expr)
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{
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struct f_tree * ret = NULL;
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if(from <= to) {
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struct f_tree *ret = NULL, *last = NULL;
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while (from <= to) {
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ret = f_new_tree();
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ret->from.type = ret->to.type = T_PAIR;
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ret->from.val.i = ret->to.val.i = make_pair(from, expr);
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ret->left = f_generate_rev_wcard(from+1, to, expr);
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ret->left = last;
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from++; last = ret;
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}
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return ret;
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}
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CF_DECLS
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