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92e6782d1f
Some public prototypes do not declare return values or out parameters as const where they should be. Avoid changing the public interface, but document those values as read-only. Closes #19692
79 lines
1.8 KiB
Markdown
79 lines
1.8 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: curl_slist_append
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Section: 3
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Source: libcurl
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See-also:
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- curl_slist_free_all (3)
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Protocol:
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- All
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Added-in: 7.1
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---
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# NAME
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curl_slist_append - add a string to an slist
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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struct curl_slist *curl_slist_append(struct curl_slist *list,
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const char *string);
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~~~
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# DESCRIPTION
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curl_slist_append(3) appends a string to a linked list of strings. The
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existing **list** should be passed as the first argument and the new list is
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returned from this function. Pass in NULL in the **list** argument to create a
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new list. The specified **string** has been appended when this function
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returns. curl_slist_append(3) copies the string. The **string** argument must
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be a valid string pointer and cannot be NULL.
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The list should be freed (after usage) with curl_slist_free_all(3).
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Its nodes and pointed content may not be altered outside this function.
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *handle = curl_easy_init();
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struct curl_slist *slist = NULL;
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struct curl_slist *temp = NULL;
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slist = curl_slist_append(slist, "pragma:");
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if(!slist)
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return -1;
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temp = curl_slist_append(slist, "Accept:");
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if(!temp) {
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curl_slist_free_all(slist);
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return -1;
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}
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slist = temp;
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curl_easy_setopt(handle, CURLOPT_HTTPHEADER, slist);
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curl_easy_perform(handle);
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curl_slist_free_all(slist); /* free the list again */
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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A null pointer is returned if anything went wrong, otherwise the new list
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pointer is returned. To avoid overwriting an existing non-empty list on
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failure, the new list should be returned to a temporary variable which can
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be tested for NULL before updating the original list pointer.
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