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curl/docs/libcurl/curl_slist_append.3

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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
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+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, 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 https://curl.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.
+.\" *
+.\" **************************************************************************
+.TH curl_slist_append 3 "November 05, 2020" "libcurl 7.75.0" "libcurl Manual"
+
+.SH NAME
+curl_slist_append - add a string to an slist
+.SH SYNOPSIS
+.B #include <curl/curl.h>
+.sp
+.BI "struct curl_slist *curl_slist_append(struct curl_slist *" list,
+.BI "const char * "string ");"
+.ad
+.SH DESCRIPTION
+\fIcurl_slist_append(3)\fP appends a string to a linked list of strings. The
+existing \fBlist\fP should be passed as the first argument and the new list is
+returned from this function. Pass in NULL in the \fBlist\fP argument to create
+a new list. The specified \fBstring\fP has been appended when this function
+returns. \fIcurl_slist_append(3)\fP copies the string.
+
+The list should be freed again (after usage) with
+\fIcurl_slist_free_all(3)\fP.
+.SH 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.
+.SH EXAMPLE
+.nf
+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 */
+.fi
+.SH "SEE ALSO"
+.BR curl_slist_free_all "(3), "