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Annotation of embedaddon/curl/docs/examples/ftpuploadresume.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2017, 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: /* <DESC>
        !            23:  * Upload to FTP, resuming failed transfers.
        !            24:  * </DESC>
        !            25:  */
        !            26: 
        !            27: #include <stdlib.h>
        !            28: #include <stdio.h>
        !            29: #include <curl/curl.h>
        !            30: 
        !            31: /* parse headers for Content-Length */
        !            32: static size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb,
        !            33:                                    void *stream)
        !            34: {
        !            35:   int r;
        !            36:   long len = 0;
        !            37: 
        !            38:   r = sscanf(ptr, "Content-Length: %ld\n", &len);
        !            39:   if(r)
        !            40:     *((long *) stream) = len;
        !            41: 
        !            42:   return size * nmemb;
        !            43: }
        !            44: 
        !            45: /* discard downloaded data */
        !            46: static size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
        !            47: {
        !            48:   (void)ptr;
        !            49:   (void)stream;
        !            50:   return size * nmemb;
        !            51: }
        !            52: 
        !            53: /* read data to upload */
        !            54: static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
        !            55: {
        !            56:   FILE *f = stream;
        !            57:   size_t n;
        !            58: 
        !            59:   if(ferror(f))
        !            60:     return CURL_READFUNC_ABORT;
        !            61: 
        !            62:   n = fread(ptr, size, nmemb, f) * size;
        !            63: 
        !            64:   return n;
        !            65: }
        !            66: 
        !            67: 
        !            68: static int upload(CURL *curlhandle, const char *remotepath,
        !            69:                   const char *localpath, long timeout, long tries)
        !            70: {
        !            71:   FILE *f;
        !            72:   long uploaded_len = 0;
        !            73:   CURLcode r = CURLE_GOT_NOTHING;
        !            74:   int c;
        !            75: 
        !            76:   f = fopen(localpath, "rb");
        !            77:   if(!f) {
        !            78:     perror(NULL);
        !            79:     return 0;
        !            80:   }
        !            81: 
        !            82:   curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
        !            83: 
        !            84:   curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
        !            85: 
        !            86:   if(timeout)
        !            87:     curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
        !            88: 
        !            89:   curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
        !            90:   curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
        !            91: 
        !            92:   curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
        !            93: 
        !            94:   curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
        !            95:   curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
        !            96: 
        !            97:   /* disable passive mode */
        !            98:   curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");
        !            99:   curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
        !           100: 
        !           101:   curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
        !           102: 
        !           103:   for(c = 0; (r != CURLE_OK) && (c < tries); c++) {
        !           104:     /* are we resuming? */
        !           105:     if(c) { /* yes */
        !           106:       /* determine the length of the file already written */
        !           107: 
        !           108:       /*
        !           109:        * With NOBODY and NOHEADER, libcurl will issue a SIZE
        !           110:        * command, but the only way to retrieve the result is
        !           111:        * to parse the returned Content-Length header. Thus,
        !           112:        * getcontentlengthfunc(). We need discardfunc() above
        !           113:        * because HEADER will dump the headers to stdout
        !           114:        * without it.
        !           115:        */
        !           116:       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
        !           117:       curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
        !           118: 
        !           119:       r = curl_easy_perform(curlhandle);
        !           120:       if(r != CURLE_OK)
        !           121:         continue;
        !           122: 
        !           123:       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
        !           124:       curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
        !           125: 
        !           126:       fseek(f, uploaded_len, SEEK_SET);
        !           127: 
        !           128:       curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
        !           129:     }
        !           130:     else { /* no */
        !           131:       curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
        !           132:     }
        !           133: 
        !           134:     r = curl_easy_perform(curlhandle);
        !           135:   }
        !           136: 
        !           137:   fclose(f);
        !           138: 
        !           139:   if(r == CURLE_OK)
        !           140:     return 1;
        !           141:   else {
        !           142:     fprintf(stderr, "%s\n", curl_easy_strerror(r));
        !           143:     return 0;
        !           144:   }
        !           145: }
        !           146: 
        !           147: int main(void)
        !           148: {
        !           149:   CURL *curlhandle = NULL;
        !           150: 
        !           151:   curl_global_init(CURL_GLOBAL_ALL);
        !           152:   curlhandle = curl_easy_init();
        !           153: 
        !           154:   upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",
        !           155:          0, 3);
        !           156: 
        !           157:   curl_easy_cleanup(curlhandle);
        !           158:   curl_global_cleanup();
        !           159: 
        !           160:   return 0;
        !           161: }