76 lines
1.6 KiB
Markdown
76 lines
1.6 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: curl_slist_append
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- curl_slist_free_all (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
curl_slist_append - add a string to an slist
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
struct curl_slist *curl_slist_append(struct curl_slist *list,
|
||
|
|
const char *string);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
curl_slist_append(3) appends a string to a linked list of strings. The
|
||
|
|
existing **list** should be passed as the first argument and the new list is
|
||
|
|
returned from this function. Pass in NULL in the **list** argument to create
|
||
|
|
a new list. The specified **string** has been appended when this function
|
||
|
|
returns. curl_slist_append(3) copies the string.
|
||
|
|
|
||
|
|
The list should be freed again (after usage) with
|
||
|
|
curl_slist_free_all(3).
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
CURL *handle;
|
||
|
|
struct curl_slist *slist = NULL;
|
||
|
|
struct curl_slist *temp = NULL;
|
||
|
|
|
||
|
|
slist = curl_slist_append(slist, "pragma:");
|
||
|
|
|
||
|
|
if(!slist)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
temp = curl_slist_append(slist, "Accept:");
|
||
|
|
|
||
|
|
if(!temp) {
|
||
|
|
curl_slist_free_all(slist);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
slist = temp;
|
||
|
|
|
||
|
|
curl_easy_setopt(handle, CURLOPT_HTTPHEADER, slist);
|
||
|
|
|
||
|
|
curl_easy_perform(handle);
|
||
|
|
|
||
|
|
curl_slist_free_all(slist); /* free the list again */
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Always
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
A null pointer is returned if anything went wrong, otherwise the new list
|
||
|
|
pointer is returned. To avoid overwriting an existing non-empty list on
|
||
|
|
failure, the new list should be returned to a temporary variable which can
|
||
|
|
be tested for NULL before updating the original list pointer.
|