CMakeLua/Utilities/cmcurl-7.19.0/docs/examples/multi-debugcallback.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: multi-debugcallback.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
   9  *
  10  * This is a very simple example using the multi interface and the debug
  11  * callback.
  12  */
  13
  14 #include <stdio.h>
  15 #include <string.h>
  16
  17 /* somewhat unix-specific */
  18 #include <sys/time.h>
  19 #include <unistd.h>
  20
  21 /* curl stuff */
  22 #include <curl/curl.h>
  23
  24 typedef char bool;
  25 #define TRUE 1
  26
  27 static
  28 void dump(const char *text,
  29           FILE *stream, unsigned char *ptr, size_t size,
  30           bool nohex)
  31 {
  32   size_t i;
  33   size_t c;
  34
  35   unsigned int width=0x10;
  36
  37   if(nohex)
  38     /* without the hex output, we can fit more on screen */
  39     width = 0x40;
  40
  41   fprintf(stream, "%s, %zd bytes (0x%zx)\n", text, size, size);
  42
  43   for(i=0; i<size; i+= width) {
  44
  45     fprintf(stream, "%04zx: ", i);
  46
  47     if(!nohex) {
  48       /* hex not disabled, show it */
  49       for(c = 0; c < width; c++)
  50         if(i+c < size)
  51           fprintf(stream, "%02x ", ptr[i+c]);
  52         else
  53           fputs("   ", stream);
  54     }
  55
  56     for(c = 0; (c < width) && (i+c < size); c++) {
  57       /* check for 0D0A; if found, skip past and start a new line of output */
  58       if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
  59         i+=(c+2-width);
  60         break;
  61       }
  62       fprintf(stream, "%c",
  63               (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
  64       /* check again for 0D0A, to avoid an extra \n if it's at width */
  65       if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
  66         i+=(c+3-width);
  67         break;
  68       }
  69     }
  70     fputc('\n', stream); /* newline */
  71   }
  72   fflush(stream);
  73 }
  74
  75 static
  76 int my_trace(CURL *handle, curl_infotype type,
  77              char *data, size_t size,
  78              void *userp)
  79 {
  80   const char *text;
  81
  82   (void)handle; /* prevent compiler warning */
  83
  84   switch (type) {
  85   case CURLINFO_TEXT:
  86     fprintf(stderr, "== Info: %s", data);
  87   default: /* in case a new one is introduced to shock us */
  88     return 0;
  89
  90   case CURLINFO_HEADER_OUT:
  91     text = "=> Send header";
  92     break;
  93   case CURLINFO_DATA_OUT:
  94     text = "=> Send data";
  95     break;
  96   case CURLINFO_HEADER_IN:
  97     text = "<= Recv header";
  98     break;
  99   case CURLINFO_DATA_IN:
 100     text = "<= Recv data";
 101     break;
 102   }
 103
 104   dump(text, stderr, data, size, TRUE);
 105   return 0;
 106 }
 107
 108 /*
 109  * Simply download a HTTP file.
 110  */
 111 int main(int argc, char **argv)
 112 {
 113   CURL *http_handle;
 114   CURLM *multi_handle;
 115
 116   int still_running; /* keep number of running handles */
 117
 118   http_handle = curl_easy_init();
 119
 120   /* set the options (I left out a few, you'll get the point anyway) */
 121   curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.haxx.se/");
 122
 123   curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
 124   curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);
 125
 126   /* init a multi stack */
 127   multi_handle = curl_multi_init();
 128
 129   /* add the individual transfers */
 130   curl_multi_add_handle(multi_handle, http_handle);
 131
 132   /* we start some action by calling perform right away */
 133   while(CURLM_CALL_MULTI_PERFORM ==
 134         curl_multi_perform(multi_handle, &still_running));
 135
 136   while(still_running) {
 137     struct timeval timeout;
 138     int rc; /* select() return code */
 139
 140     fd_set fdread;
 141     fd_set fdwrite;
 142     fd_set fdexcep;
 143     int maxfd;
 144
 145     FD_ZERO(&fdread);
 146     FD_ZERO(&fdwrite);
 147     FD_ZERO(&fdexcep);
 148
 149     /* set a suitable timeout to play around with */
 150     timeout.tv_sec = 1;
 151     timeout.tv_usec = 0;
 152
 153     /* get file descriptors from the transfers */
 154     curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
 155
 156     /* In a real-world program you OF COURSE check the return code of the
 157        function calls, *and* you make sure that maxfd is bigger than -1
 158        so that the call to select() below makes sense! */
 159
 160     rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
 161
 162     switch(rc) {
 163     case -1:
 164       /* select error */
 165       still_running = 0;
 166       printf("select() returns error, this is badness\n");
 167       break;
 168     case 0:
 169     default:
 170       /* timeout or readable/writable sockets */
 171       while(CURLM_CALL_MULTI_PERFORM ==
 172             curl_multi_perform(multi_handle, &still_running));
 173       break;
 174     }
 175   }
 176
 177   curl_multi_cleanup(multi_handle);
 178
 179   curl_easy_cleanup(http_handle);
 180
 181   return 0;
 182 }