added ftpgetinfo sample since users asked frequently for such a sample.

docs/examples/ftpgetinfo.c

@@ -0,0 +1,77 @@
+/*****************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * $Id$
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <curl/curl.h>
+#include <curl/types.h>
+#include <curl/easy.h>
+
+/*
+ * This is an example showing how to check a single file's size and mtime
+ * from an FTP server.
+ */
+
+static size_t throw_away(void *ptr, size_t size, size_t nmemb, void *data)
+{
+  /* we are not interested in the headers itself,
+     so we only return the size we would have saved ... */  
+  return (size_t)(size * nmemb);
+}
+
+int main(void)
+{
+  /* Check for binutils 2.19.1 from ftp.gnu.org's FTP site. */
+  char ftpurl[] = "ftp://ftp.gnu.org/gnu/binutils/binutils-2.19.1.tar.bz2";
+  CURL *curl;
+  CURLcode res;
+  const time_t filetime;
+  const double filesize;
+  const char *filename = strrchr(ftpurl, '/') + 1;
+
+  curl_global_init(CURL_GLOBAL_DEFAULT);
+
+  curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, ftpurl);
+    /* No download if the file */
+    curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
+    /* Ask for filetime */
+    curl_easy_setopt(curl, CURLOPT_FILETIME, 1L); 
+    /* No header output: TODO 14.1 http-style HEAD output for ftp */
+    curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, throw_away);
+    curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
+    /* Switch on full protocol/debug output */
+    /* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */
+
+    res = curl_easy_perform(curl);
+
+    if(CURLE_OK == res) {
+      /* http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html */
+      res = curl_easy_getinfo(curl, CURLINFO_FILETIME, &filetime);
+      if((CURLE_OK == res) && filetime)
+        printf("filetime %s: %s", filename, ctime(&filetime));
+      res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &filesize);
+      if((CURLE_OK == res) && filesize)
+        printf("filesize %s: %0.0f bytes\n", filename, filesize);
+    } else {
+      /* we failed */
+      fprintf(stderr, "curl told us %d\n", res);
+    }
+
+    /* always cleanup */
+    curl_easy_cleanup(curl);
+  }
+
+  curl_global_cleanup();
+
+  return 0;
+}