mirror of
https://github.com/moparisthebest/curl
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35648f2e79
This header file must be included after all header files except memdebug.h, as it does similar memory function redefinitions and can be similarly affected by conflicting definitions in system or dependent library headers.
144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "slist.h"
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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/* returns last node in linked list */
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static struct curl_slist *slist_get_last(struct curl_slist *list)
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{
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struct curl_slist *item;
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/* if caller passed us a NULL, return now */
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if(!list)
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return NULL;
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/* loop through to find the last item */
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item = list;
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while(item->next) {
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item = item->next;
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}
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return item;
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}
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/*
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* Curl_slist_append_nodup() appends a string to the linked list. Rather than
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* copying the string in dynamic storage, it takes its ownership. The string
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* should have been malloc()ated. Curl_slist_append_nodup always returns
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* the address of the first record, so that you can use this function as an
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* initialization function as well as an append function.
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* If an error occurs, NULL is returned and the string argument is NOT
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* released.
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*/
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struct curl_slist *Curl_slist_append_nodup(struct curl_slist *list, char *data)
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{
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struct curl_slist *last;
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struct curl_slist *new_item;
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DEBUGASSERT(data);
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new_item = malloc(sizeof(struct curl_slist));
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if(!new_item)
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return NULL;
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new_item->next = NULL;
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new_item->data = data;
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/* if this is the first item, then new_item *is* the list */
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if(!list)
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return new_item;
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last = slist_get_last(list);
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last->next = new_item;
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return list;
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}
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/*
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* curl_slist_append() appends a string to the linked list. It always returns
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* the address of the first record, so that you can use this function as an
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* initialization function as well as an append function. If you find this
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* bothersome, then simply create a separate _init function and call it
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* appropriately from within the program.
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*/
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struct curl_slist *curl_slist_append(struct curl_slist *list,
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const char *data)
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{
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char *dupdata = strdup(data);
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if(!dupdata)
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return NULL;
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list = Curl_slist_append_nodup(list, dupdata);
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if(!list)
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free(dupdata);
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return list;
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}
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/*
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* Curl_slist_duplicate() duplicates a linked list. It always returns the
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* address of the first record of the cloned list or NULL in case of an
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* error (or if the input list was NULL).
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*/
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struct curl_slist *Curl_slist_duplicate(struct curl_slist *inlist)
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{
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struct curl_slist *outlist = NULL;
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struct curl_slist *tmp;
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while(inlist) {
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tmp = curl_slist_append(outlist, inlist->data);
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if(!tmp) {
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curl_slist_free_all(outlist);
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return NULL;
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}
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outlist = tmp;
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inlist = inlist->next;
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}
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return outlist;
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}
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/* be nice and clean up resources */
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void curl_slist_free_all(struct curl_slist *list)
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{
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struct curl_slist *next;
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struct curl_slist *item;
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if(!list)
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return;
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item = list;
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do {
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next = item->next;
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Curl_safefree(item->data);
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free(item);
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item = next;
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} while(next);
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}
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