xref: /curl/docs/examples/ftpuploadfrommem.c (revision f81f351b)
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 
32 static 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 
43 struct WriteThis {
44   const char *readptr;
45   size_t sizeleft;
46 };
47 
read_callback(char * ptr,size_t size,size_t nmemb,void * userp)48 static 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 
main(void)69 int 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 inits 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 gets 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