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