curl/lib/slist.c

128 lines
3.3 KiB
C
Raw Normal View History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
build: fix circular header inclusion with other packages This commit renames lib/setup.h to lib/curl_setup.h and renames lib/setup_once.h to lib/curl_setup_once.h. Removes the need and usage of a header inclusion guard foreign to libcurl. [1] Removes the need and presence of an alarming notice we carried in old setup_once.h [2] ---------------------------------------- 1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H, this single inclusion guard is enough to ensure that inclusion of lib/setup_once.h done from lib/setup.h is only done once. Additionally lib/setup.h has always used __SETUP_ONCE_H macro to protect inclusion of setup_once.h even after commit ec691ca3, this was to avoid a circular header inclusion triggered when building a c-ares enabled version with c-ares sources available which also has a setup_once.h header. Commit ec691ca3 exposes the real nature of __SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard foreign to libcurl belonging to c-ares's setup_once.h The renaming this commit does, fixes the circular header inclusion, and as such removes the need and usage of a header inclusion guard foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl. 2 - Due to the circular interdependency of old lib/setup_once.h and the c-ares setup_once.h header, old file lib/setup_once.h has carried back from 2006 up to now days an alarming and prominent notice about the need of keeping libcurl's and c-ares's setup_once.h in sync. Given that this commit fixes the circular interdependency, the need and presence of mentioned notice is removed. All mentioned interdependencies come back from now old days when the c-ares project lived inside a curl subdirectory. This commit removes last traces of such fact.
2013-01-07 02:06:49 +08:00
#include "curl_setup.h"
#include "curl_memory.h"
#include "slist.h"
/* The last #include file should be: */
#include "memdebug.h"
/* returns last node in linked list */
static struct curl_slist *slist_get_last(struct curl_slist *list)
{
struct curl_slist *item;
/* if caller passed us a NULL, return now */
if(!list)
return NULL;
/* loop through to find the last item */
item = list;
while(item->next) {
item = item->next;
}
return item;
}
/*
* curl_slist_append() appends a string to the linked list. It always returns
* the address of the first record, so that you can use this function as an
* initialization function as well as an append function. If you find this
* bothersome, then simply create a separate _init function and call it
* appropriately from within the program.
*/
struct curl_slist *curl_slist_append(struct curl_slist *list,
const char *data)
{
struct curl_slist *last;
struct curl_slist *new_item;
new_item = malloc(sizeof(struct curl_slist));
if(new_item) {
char *dupdata = strdup(data);
if(dupdata) {
new_item->next = NULL;
new_item->data = dupdata;
}
else {
free(new_item);
return NULL;
}
}
else
return NULL;
if(list) {
last = slist_get_last(list);
last->next = new_item;
return list;
}
/* if this is the first item, then new_item *is* the list */
return new_item;
}
/*
* Curl_slist_duplicate() duplicates a linked list. It always returns the
* address of the first record of the cloned list or NULL in case of an
* error (or if the input list was NULL).
*/
struct curl_slist *Curl_slist_duplicate(struct curl_slist *inlist)
{
struct curl_slist *outlist = NULL;
struct curl_slist *tmp;
while(inlist) {
tmp = curl_slist_append(outlist, inlist->data);
if(!tmp) {
curl_slist_free_all(outlist);
return NULL;
}
outlist = tmp;
inlist = inlist->next;
}
return outlist;
}
/* be nice and clean up resources */
void curl_slist_free_all(struct curl_slist *list)
{
struct curl_slist *next;
struct curl_slist *item;
if(!list)
return;
item = list;
do {
next = item->next;
2011-10-08 02:50:57 +08:00
Curl_safefree(item->data);
free(item);
item = next;
} while(next);
}