mirror of
https://github.com/moparisthebest/curl
synced 2024-12-24 17:18:48 -05:00
ac0a88fd25
Follow-up from 4d2f800677
155 lines
5.2 KiB
C
155 lines
5.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* <DESC>
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* Issue an HTTP POST and provide the data through the read callback.
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* </DESC>
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*/
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#include <stdio.h>
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#include <string.h>
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#include <curl/curl.h>
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/* silly test data to POST */
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static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing "
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"elit. Sed vel urna neque. Ut quis leo metus. Quisque eleifend, ex at "
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"laoreet rhoncus, odio ipsum semper metus, at tempus ante urna in mauris. "
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"Suspendisse ornare tempor venenatis. Ut dui neque, pellentesque a varius "
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"eget, mattis vitae ligula. Fusce ut pharetra est. Ut ullamcorper mi ac "
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"sollicitudin semper. Praesent sit amet tellus varius, posuere nulla non, "
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"rhoncus ipsum.";
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struct WriteThis {
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const char *readptr;
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size_t sizeleft;
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};
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static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp)
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{
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struct WriteThis *wt = (struct WriteThis *)userp;
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size_t buffer_size = size*nmemb;
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if(wt->sizeleft) {
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/* copy as much as possible from the source to the destination */
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size_t copy_this_much = wt->sizeleft;
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if(copy_this_much > buffer_size)
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copy_this_much = buffer_size;
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memcpy(dest, wt->readptr, copy_this_much);
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wt->readptr += copy_this_much;
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wt->sizeleft -= copy_this_much;
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return copy_this_much; /* we copied this many bytes */
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}
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return 0; /* no more data left to deliver */
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}
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int main(void)
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{
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CURL *curl;
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CURLcode res;
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struct WriteThis wt;
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wt.readptr = data;
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wt.sizeleft = strlen(data);
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/* In windows, this will init the winsock stuff */
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res = curl_global_init(CURL_GLOBAL_DEFAULT);
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/* Check for errors */
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if(res != CURLE_OK) {
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fprintf(stderr, "curl_global_init() failed: %s\n",
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curl_easy_strerror(res));
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return 1;
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}
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/* get a curl handle */
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curl = curl_easy_init();
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if(curl) {
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/* First set the URL that is about to receive our POST. */
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/index.cgi");
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/* Now specify we want to POST data */
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curl_easy_setopt(curl, CURLOPT_POST, 1L);
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/* we want to use our own read function */
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curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
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/* pointer to pass to our read function */
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curl_easy_setopt(curl, CURLOPT_READDATA, &wt);
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/* get verbose debug output please */
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curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
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/*
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If you use POST to a HTTP 1.1 server, you can send data without knowing
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the size before starting the POST if you use chunked encoding. You
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enable this by adding a header like "Transfer-Encoding: chunked" with
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CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must
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specify the size in the request.
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*/
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#ifdef USE_CHUNKED
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{
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struct curl_slist *chunk = NULL;
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chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked");
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res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
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/* use curl_slist_free_all() after the *perform() call to free this
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list again */
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}
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#else
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/* Set the expected POST size. If you want to POST large amounts of data,
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consider CURLOPT_POSTFIELDSIZE_LARGE */
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)wt.sizeleft);
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#endif
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#ifdef DISABLE_EXPECT
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/*
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Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
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header. You can disable this header with CURLOPT_HTTPHEADER as usual.
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NOTE: if you want chunked transfer too, you need to combine these two
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since you can only set one list of headers with CURLOPT_HTTPHEADER. */
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/* A less good option would be to enforce HTTP 1.0, but that might also
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have other implications. */
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{
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struct curl_slist *chunk = NULL;
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chunk = curl_slist_append(chunk, "Expect:");
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res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
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/* use curl_slist_free_all() after the *perform() call to free this
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list again */
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}
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#endif
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/* Perform the request, res will get the return code */
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res = curl_easy_perform(curl);
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/* Check for errors */
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if(res != CURLE_OK)
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fprintf(stderr, "curl_easy_perform() failed: %s\n",
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curl_easy_strerror(res));
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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curl_global_cleanup();
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return 0;
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}
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