1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: curl_slist_append 5Section: 3 6Source: libcurl 7See-also: 8 - curl_slist_free_all (3) 9Protocol: 10 - All 11--- 12 13# NAME 14 15curl_slist_append - add a string to an slist 16 17# SYNOPSIS 18 19~~~c 20#include <curl/curl.h> 21 22struct curl_slist *curl_slist_append(struct curl_slist *list, 23 const char *string); 24~~~ 25 26# DESCRIPTION 27 28curl_slist_append(3) appends a string to a linked list of strings. The 29existing **list** should be passed as the first argument and the new list is 30returned from this function. Pass in NULL in the **list** argument to create 31a new list. The specified **string** has been appended when this function 32returns. curl_slist_append(3) copies the string. 33 34The list should be freed again (after usage) with 35curl_slist_free_all(3). 36 37# EXAMPLE 38 39~~~c 40int main(void) 41{ 42 CURL *handle; 43 struct curl_slist *slist = NULL; 44 struct curl_slist *temp = NULL; 45 46 slist = curl_slist_append(slist, "pragma:"); 47 48 if(!slist) 49 return -1; 50 51 temp = curl_slist_append(slist, "Accept:"); 52 53 if(!temp) { 54 curl_slist_free_all(slist); 55 return -1; 56 } 57 58 slist = temp; 59 60 curl_easy_setopt(handle, CURLOPT_HTTPHEADER, slist); 61 62 curl_easy_perform(handle); 63 64 curl_slist_free_all(slist); /* free the list again */ 65} 66~~~ 67 68# AVAILABILITY 69 70Always 71 72# RETURN VALUE 73 74A null pointer is returned if anything went wrong, otherwise the new list 75pointer is returned. To avoid overwriting an existing non-empty list on 76failure, the new list should be returned to a temporary variable which can 77be tested for NULL before updating the original list pointer. 78
