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 * The membership is defined as pointer equivalence.
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 * The membership is defined as pointer equivalence.
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 *
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 *
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 * @param link Item to look for.
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 * @param link Item to look for.
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 * @param head List to look in.
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 * @param head List to look in.
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 *
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 *
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 * @return 1 if link is contained in head, 0 otherwise.
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 * @return true if link is contained in head, false otherwise.
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 *
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 *
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 */
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 */
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int list_member(link_t *link, link_t *head)
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bool list_member(const link_t *link, const link_t *head)
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{
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{
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    int found = 0;
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    bool found = false;
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    link_t *hlp = head->next;
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    link_t *hlp = head->next;
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    while (hlp != head) {
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    while (hlp != head) {
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        if (hlp == link) {
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        if (hlp == link) {
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            found = 1;
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            found = true;
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            break;
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            break;
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        }
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        }
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        hlp = hlp->next;
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        hlp = hlp->next;
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    }
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    }
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