examples: ftpuploadfrommem.c

Uploads data to an FTP site, directly from memory.

Closes #1451

docs/examples/Makefile.inc

@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+# 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
@@ -32,7 +32,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
   imap-list imap-lsub imap-fetch imap-store imap-append imap-examine       \
   imap-search imap-create imap-delete imap-copy imap-noop imap-ssl         \
   imap-tls imap-multi url2file sftpget ftpsget postinmemory http2-download \
-  http2-upload http2-serverpush getredirect
+  http2-upload http2-serverpush getredirect ftpuploadfrommem
 
 # These examples require external dependencies that may not be commonly
 # available on POSIX systems, so don't bother attempting to compile them here.

docs/examples/ftpuploadfrommem.c

@@ -0,0 +1,124 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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>
+
+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. Ut placerat, sem eu pharetra mattis, ante lacus fringilla "
+  "diam, a consequat quam eros eget erat.";
+
+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;
+}