145 lines
3.8 KiB
C
145 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 - 2020, 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 https://curl.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 <curl/curl.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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