/usr/share/doc/libcurl4/examples/ftpuploadfrommem.c is in libcurl4-doc 7.58.0-2ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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.
*
***************************************************************************/
/* <DESC>
* FTP upload a file from memory
* </DESC>
*/
#include <stdio.h>
#include <string.h>
#include <curl/curl.h>
static const char data[]=
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
"Nam rhoncus odio id venenatis volutpat. Vestibulum dapibus "
"bibendum ullamcorper. Maecenas finibus elit augue, vel "
"condimentum odio maximus nec. In hac habitasse platea dictumst. "
"Vestibulum vel dolor et turpis rutrum finibus ac at nulla. "
"Vivamus nec neque ac elit blandit pretium vitae maximus ipsum. "
"Quisque sodales magna vel erat auctor, sed pellentesque nisi "
"rhoncus. Donec vehicula maximus pretium. Aliquam eu tincidunt "
"lorem.";
struct WriteThis {
const char *readptr;
size_t sizeleft;
};
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
{
struct WriteThis *upload = (struct WriteThis *)userp;
size_t max = size*nmemb;
if(max < 1)
return 0;
if(upload->sizeleft) {
size_t copylen = max;
if(copylen > upload->sizeleft)
copylen = upload->sizeleft;
memcpy(ptr, upload->readptr, copylen);
upload->readptr += copylen;
upload->sizeleft -= copylen;
return copylen;
}
return 0; /* no more data left to deliver */
}
int main(void)
{
CURL *curl;
CURLcode res;
struct WriteThis upload;
upload.readptr = data;
upload.sizeleft = strlen(data);
/* In windows, this will init the winsock stuff */
res = curl_global_init(CURL_GLOBAL_DEFAULT);
/* Check for errors */
if(res != CURLE_OK) {
fprintf(stderr, "curl_global_init() failed: %s\n",
curl_easy_strerror(res));
return 1;
}
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
/* First set the URL, the target file */
curl_easy_setopt(curl, CURLOPT_URL,
"ftp://example.com/path/to/upload/file");
/* User and password for the FTP login */
curl_easy_setopt(curl, CURLOPT_USERPWD, "login:secret");
/* Now specify we want to UPLOAD data */
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
/* we want to use our own read function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
/* pointer to pass to our read function */
curl_easy_setopt(curl, CURLOPT_READDATA, &upload);
/* get verbose debug output please */
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
/* Set the expected upload size. */
curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
(curl_off_t)upload.sizeleft);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
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