Update libcurl

Engine/lib/curl/docs/examples/progressfunc.c

@@ -0,0 +1,97 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+/* <DESC>
+ * Use the progress callbacks, old and/or new one depending on available
+ * libcurl version.
+ * </DESC>
+ */
+#include <stdio.h>
+#include <curl/curl.h>
+
+#define MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL     3000000
+#define STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES         6000
+
+struct myprogress {
+  curl_off_t lastruntime; /* type depends on version, see above */
+  CURL *curl;
+};
+
+/* this is how the CURLOPT_XFERINFOFUNCTION callback works */
+static int xferinfo(void *p,
+                    curl_off_t dltotal, curl_off_t dlnow,
+                    curl_off_t ultotal, curl_off_t ulnow)
+{
+  struct myprogress *myp = (struct myprogress *)p;
+  CURL *curl = myp->curl;
+  curl_off_t curtime = 0;
+
+  curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME_T, &curtime);
+
+  /* under certain circumstances it may be desirable for certain functionality
+     to only run every N seconds, in order to do this the transaction time can
+     be used */
+  if((curtime - myp->lastruntime) >= MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL) {
+    myp->lastruntime = curtime;
+    fprintf(stderr, "TOTAL TIME: %lu.%06lu\r\n",
+            (unsigned long)(curtime / 1000000),
+            (unsigned long)(curtime % 1000000));
+  }
+
+  fprintf(stderr, "UP: %lu of %lu  DOWN: %lu of %lu\r\n",
+          (unsigned long)ulnow, (unsigned long)ultotal,
+          (unsigned long)dlnow, (unsigned long)dltotal);
+
+  if(dlnow > STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES)
+    return 1;
+  return 0;
+}
+
+int main(void)
+{
+  CURL *curl;
+  CURLcode res = CURLE_OK;
+  struct myprogress prog;
+
+  curl = curl_easy_init();
+  if(curl) {
+    prog.lastruntime = 0;
+    prog.curl = curl;
+
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+
+    curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, xferinfo);
+    /* pass the struct pointer into the xferinfo function */
+    curl_easy_setopt(curl, CURLOPT_XFERINFODATA, &prog);
+
+    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
+    res = curl_easy_perform(curl);
+
+    if(res != CURLE_OK)
+      fprintf(stderr, "%s\n", curl_easy_strerror(res));
+
+    /* always cleanup */
+    curl_easy_cleanup(curl);
+  }
+  return (int)res;
+}