1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24/* <DESC>
25 * FTP upload a file from memory
26 * </DESC>
27 */
28#include <stdio.h>
29#include <string.h>
30#include <curl/curl.h>
31
32static const char data[]=
33  "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
34  "Nam rhoncus odio id venenatis volutpat. Vestibulum dapibus "
35  "bibendum ullamcorper. Maecenas finibus elit augue, vel "
36  "condimentum odio maximus nec. In hac habitasse platea dictumst. "
37  "Vestibulum vel dolor et turpis rutrum finibus ac at nulla. "
38  "Vivamus nec neque ac elit blandit pretium vitae maximus ipsum. "
39  "Quisque sodales magna vel erat auctor, sed pellentesque nisi "
40  "rhoncus. Donec vehicula maximus pretium. Aliquam eu tincidunt "
41  "lorem.";
42
43struct WriteThis {
44  const char *readptr;
45  size_t sizeleft;
46};
47
48static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
49{
50  struct WriteThis *upload = (struct WriteThis *)userp;
51  size_t max = size*nmemb;
52
53  if(max < 1)
54    return 0;
55
56  if(upload->sizeleft) {
57    size_t copylen = max;
58    if(copylen > upload->sizeleft)
59      copylen = upload->sizeleft;
60    memcpy(ptr, upload->readptr, copylen);
61    upload->readptr += copylen;
62    upload->sizeleft -= copylen;
63    return copylen;
64  }
65
66  return 0;                          /* no more data left to deliver */
67}
68
69int main(void)
70{
71  CURL *curl;
72  CURLcode res;
73
74  struct WriteThis upload;
75
76  upload.readptr = data;
77  upload.sizeleft = strlen(data);
78
79  /* In windows, this will init the winsock stuff */
80  res = curl_global_init(CURL_GLOBAL_DEFAULT);
81  /* Check for errors */
82  if(res != CURLE_OK) {
83    fprintf(stderr, "curl_global_init() failed: %s\n",
84            curl_easy_strerror(res));
85    return 1;
86  }
87
88  /* get a curl handle */
89  curl = curl_easy_init();
90  if(curl) {
91    /* First set the URL, the target file */
92    curl_easy_setopt(curl, CURLOPT_URL,
93                     "ftp://example.com/path/to/upload/file");
94
95    /* User and password for the FTP login */
96    curl_easy_setopt(curl, CURLOPT_USERPWD, "login:secret");
97
98    /* Now specify we want to UPLOAD data */
99    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
100
101    /* we want to use our own read function */
102    curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
103
104    /* pointer to pass to our read function */
105    curl_easy_setopt(curl, CURLOPT_READDATA, &upload);
106
107    /* get verbose debug output please */
108    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
109
110    /* Set the expected upload size. */
111    curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
112                     (curl_off_t)upload.sizeleft);
113
114    /* Perform the request, res will get the return code */
115    res = curl_easy_perform(curl);
116    /* Check for errors */
117    if(res != CURLE_OK)
118      fprintf(stderr, "curl_easy_perform() failed: %s\n",
119              curl_easy_strerror(res));
120
121    /* always cleanup */
122    curl_easy_cleanup(curl);
123  }
124  curl_global_cleanup();
125  return 0;
126}
127