CMakeLua/Utilities/cmcurl-7.19.0/docs/examples/ftpuploadresume.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: ftpuploadresume.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
   9  *
  10  * Upload to FTP, resuming failed transfers
  11  *
  12  * Compile for MinGW like this:
  13  *  gcc -Wall -pedantic -std=c99 ftpuploadwithresume.c -o ftpuploadresume.exe
  14  *  -lcurl -lmsvcr70
  15  *
  16  * Written by Philip Bock
  17  */
  18
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21
  22 #include <curl/curl.h>
  23
  24 #if defined(_MSC_VER) && (_MSC_VER < 1300)
  25 #  error _snscanf requires MSVC 7.0 or later.
  26 #endif
  27
  28 /* The MinGW headers are missing a few Win32 function definitions,
  29    you shouldn't need this if you use VC++ */
  30 #ifdef __MINGW32__
  31 int __cdecl _snscanf(const char * input, size_t length, const char * format, ...);
  32 #endif
  33
  34
  35 /* parse headers for Content-Length */
  36 size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
  37         int r;
  38         long len = 0;
  39
  40         /* _snscanf() is Win32 specific */
  41         r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);
  42
  43         if (r) /* Microsoft: we don't read the specs */
  44                 *((long *) stream) = len;
  45
  46         return size * nmemb;
  47 }
  48
  49 /* discard downloaded data */
  50 size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
  51         return size * nmemb;
  52 }
  53
  54 /* read data to upload */
  55 size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
  56 {
  57         FILE *f = stream;
  58         size_t n;
  59
  60         if (ferror(f))
  61                 return CURL_READFUNC_ABORT;
  62
  63         n = fread(ptr, size, nmemb, f) * size;
  64
  65         return n;
  66 }
  67
  68
  69 int upload(CURL *curlhandle, const char * remotepath, const char * localpath,
  70            long timeout, long tries)
  71 {
  72         FILE *f;
  73         long uploaded_len = 0;
  74         CURLcode r = CURLE_GOT_NOTHING;
  75         int c;
  76
  77         f = fopen(localpath, "rb");
  78         if (f == NULL) {
  79                 perror(NULL);
  80                 return 0;
  81         }
  82
  83         curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
  84
  85         curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
  86
  87         if (timeout)
  88                 curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
  89
  90         curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
  91         curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
  92
  93         curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
  94
  95         curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
  96         curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
  97
  98         curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */
  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(int c, char **argv) {
 148         CURL *curlhandle = NULL;
 149
 150         curl_global_init(CURL_GLOBAL_ALL);
 151         curlhandle = curl_easy_init();
 152
 153         upload(curlhandle, "ftp://user:pass@host/path/file", "C:\\file", 0, 3);
 154
 155         curl_easy_cleanup(curlhandle);
 156         curl_global_cleanup();
 157
 158         return 0;
 159 }