curl_slist_append(3)            libcurl Manual            curl_slist_append(3)

NAME
       curl_slist_append - add a string to an slist

SYNOPSIS
       #include <curl/curl.h>

       struct curl_slist *curl_slist_append(struct curl_slist *list, const
       char * string);

DESCRIPTION
       _slist_append&section=3">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. _slist_append&section=3">curl_slist_append(3) copies the string.

       The list should be freed again (after usage) with
       _slist_free_all&section=3">curl_slist_free_all(3).

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.

EXAMPLE
       CURL *handle;
       struct curl_slist *slist=NULL;
       struct curl_slist *temp=NULL;

       slist = curl_slist_append(slist, "pragma:");

       if (slist == NULL)
         return -1;

       temp = curl_slist_append(slist, "Accept:")

       if (temp == NULL) {
         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 */

SEE ALSO
       curl_slist_free_all(3),

libcurl 7.77.0                 November 5, 2020           curl_slist_append(3)