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Annotation of embedaddon/curl/docs/examples/ftpupload.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2019, 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.haxx.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:  ***************************************************************************/
                     22: #include <stdio.h>
                     23: #include <string.h>
                     24: 
                     25: #include <curl/curl.h>
                     26: #include <sys/types.h>
                     27: #include <sys/stat.h>
                     28: #include <fcntl.h>
                     29: #include <errno.h>
                     30: #ifdef WIN32
                     31: #include <io.h>
                     32: #else
                     33: #include <unistd.h>
                     34: #endif
                     35: 
                     36: /* <DESC>
                     37:  * Performs an FTP upload and renames the file just after a successful
                     38:  * transfer.
                     39:  * </DESC>
                     40:  */
                     41: 
                     42: #define LOCAL_FILE      "/tmp/uploadthis.txt"
                     43: #define UPLOAD_FILE_AS  "while-uploading.txt"
                     44: #define REMOTE_URL      "ftp://example.com/"  UPLOAD_FILE_AS
                     45: #define RENAME_FILE_TO  "renamed-and-fine.txt"
                     46: 
                     47: /* NOTE: if you want this example to work on Windows with libcurl as a
                     48:    DLL, you MUST also provide a read callback with CURLOPT_READFUNCTION.
                     49:    Failing to do so will give you a crash since a DLL may not use the
                     50:    variable's memory when passed in to it from an app like this. */
                     51: static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
                     52: {
                     53:   curl_off_t nread;
                     54:   /* in real-world cases, this would probably get this data differently
                     55:      as this fread() stuff is exactly what the library already would do
                     56:      by default internally */
                     57:   size_t retcode = fread(ptr, size, nmemb, stream);
                     58: 
                     59:   nread = (curl_off_t)retcode;
                     60: 
                     61:   fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T
                     62:           " bytes from file\n", nread);
                     63:   return retcode;
                     64: }
                     65: 
                     66: int main(void)
                     67: {
                     68:   CURL *curl;
                     69:   CURLcode res;
                     70:   FILE *hd_src;
                     71:   struct stat file_info;
                     72:   curl_off_t fsize;
                     73: 
                     74:   struct curl_slist *headerlist = NULL;
                     75:   static const char buf_1 [] = "RNFR " UPLOAD_FILE_AS;
                     76:   static const char buf_2 [] = "RNTO " RENAME_FILE_TO;
                     77: 
                     78:   /* get the file size of the local file */
                     79:   if(stat(LOCAL_FILE, &file_info)) {
                     80:     printf("Couldn't open '%s': %s\n", LOCAL_FILE, strerror(errno));
                     81:     return 1;
                     82:   }
                     83:   fsize = (curl_off_t)file_info.st_size;
                     84: 
                     85:   printf("Local file size: %" CURL_FORMAT_CURL_OFF_T " bytes.\n", fsize);
                     86: 
                     87:   /* get a FILE * of the same file */
                     88:   hd_src = fopen(LOCAL_FILE, "rb");
                     89: 
                     90:   /* In windows, this will init the winsock stuff */
                     91:   curl_global_init(CURL_GLOBAL_ALL);
                     92: 
                     93:   /* get a curl handle */
                     94:   curl = curl_easy_init();
                     95:   if(curl) {
                     96:     /* build a list of commands to pass to libcurl */
                     97:     headerlist = curl_slist_append(headerlist, buf_1);
                     98:     headerlist = curl_slist_append(headerlist, buf_2);
                     99: 
                    100:     /* we want to use our own read function */
                    101:     curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
                    102: 
                    103:     /* enable uploading */
                    104:     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
                    105: 
                    106:     /* specify target */
                    107:     curl_easy_setopt(curl, CURLOPT_URL, REMOTE_URL);
                    108: 
                    109:     /* pass in that last of FTP commands to run after the transfer */
                    110:     curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);
                    111: 
                    112:     /* now specify which file to upload */
                    113:     curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
                    114: 
                    115:     /* Set the size of the file to upload (optional).  If you give a *_LARGE
                    116:        option you MUST make sure that the type of the passed-in argument is a
                    117:        curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must
                    118:        make sure that to pass in a type 'long' argument. */
                    119:     curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
                    120:                      (curl_off_t)fsize);
                    121: 
                    122:     /* Now run off and do what you've been told! */
                    123:     res = curl_easy_perform(curl);
                    124:     /* Check for errors */
                    125:     if(res != CURLE_OK)
                    126:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    127:               curl_easy_strerror(res));
                    128: 
                    129:     /* clean up the FTP commands list */
                    130:     curl_slist_free_all(headerlist);
                    131: 
                    132:     /* always cleanup */
                    133:     curl_easy_cleanup(curl);
                    134:   }
                    135:   fclose(hd_src); /* close the local file */
                    136: 
                    137:   curl_global_cleanup();
                    138:   return 0;
                    139: }