1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel (at) 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 * Use the progress callbacks, old and/or new one depending on available 24 * libcurl version. 25 * </DESC> 26 */ 27 #include <stdio.h> 28 #include <curl/curl.h> 29 30 #if LIBCURL_VERSION_NUM >= 0x073d00 31 /* In libcurl 7.61.0, support was added for extracting the time in plain 32 microseconds. Older libcurl versions are stuck in using 'double' for this 33 information so we complicate this example a bit by supporting either 34 approach. */ 35 #define TIME_IN_US 1 /* microseconds */ 36 #define TIMETYPE curl_off_t 37 #define TIMEOPT CURLINFO_TOTAL_TIME_T 38 #define MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL 3000000 39 #else 40 #define TIMETYPE double 41 #define TIMEOPT CURLINFO_TOTAL_TIME 42 #define MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL 3 43 #endif 44 45 #define STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES 6000 46 47 struct myprogress { 48 TIMETYPE lastruntime; /* type depends on version, see above */ 49 CURL *curl; 50 }; 51 52 /* this is how the CURLOPT_XFERINFOFUNCTION callback works */ 53 static int xferinfo(void *p, 54 curl_off_t dltotal, curl_off_t dlnow, 55 curl_off_t ultotal, curl_off_t ulnow) 56 { 57 struct myprogress *myp = (struct myprogress *)p; 58 CURL *curl = myp->curl; 59 TIMETYPE curtime = 0; 60 61 curl_easy_getinfo(curl, TIMEOPT, &curtime); 62 63 /* under certain circumstances it may be desirable for certain functionality 64 to only run every N seconds, in order to do this the transaction time can 65 be used */ 66 if((curtime - myp->lastruntime) >= MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL) { 67 myp->lastruntime = curtime; 68 #ifdef TIME_IN_US 69 fprintf(stderr, "TOTAL TIME: %" CURL_FORMAT_CURL_OFF_T ".%06ld\r\n", 70 (curtime / 1000000), (long)(curtime % 1000000)); 71 #else 72 fprintf(stderr, "TOTAL TIME: %f \r\n", curtime); 73 #endif 74 } 75 76 fprintf(stderr, "UP: %" CURL_FORMAT_CURL_OFF_T " of %" CURL_FORMAT_CURL_OFF_T 77 " DOWN: %" CURL_FORMAT_CURL_OFF_T " of %" CURL_FORMAT_CURL_OFF_T 78 "\r\n", 79 ulnow, ultotal, dlnow, dltotal); 80 81 if(dlnow > STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES) 82 return 1; 83 return 0; 84 } 85 86 #if LIBCURL_VERSION_NUM < 0x072000 87 /* for libcurl older than 7.32.0 (CURLOPT_PROGRESSFUNCTION) */ 88 static int older_progress(void *p, 89 double dltotal, double dlnow, 90 double ultotal, double ulnow) 91 { 92 return xferinfo(p, 93 (curl_off_t)dltotal, 94 (curl_off_t)dlnow, 95 (curl_off_t)ultotal, 96 (curl_off_t)ulnow); 97 } 98 #endif 99 100 int main(void) 101 { 102 CURL *curl; 103 CURLcode res = CURLE_OK; 104 struct myprogress prog; 105 106 curl = curl_easy_init(); 107 if(curl) { 108 prog.lastruntime = 0; 109 prog.curl = curl; 110 111 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); 112 113 #if LIBCURL_VERSION_NUM >= 0x072000 114 /* xferinfo was introduced in 7.32.0, no earlier libcurl versions will 115 compile as they won't have the symbols around. 116 117 If built with a newer libcurl, but running with an older libcurl: 118 curl_easy_setopt() will fail in run-time trying to set the new 119 callback, making the older callback get used. 120 121 New libcurls will prefer the new callback and instead use that one even 122 if both callbacks are set. */ 123 124 curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, xferinfo); 125 /* pass the struct pointer into the xferinfo function, note that this is 126 an alias to CURLOPT_PROGRESSDATA */ 127 curl_easy_setopt(curl, CURLOPT_XFERINFODATA, &prog); 128 #else 129 curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, older_progress); 130 /* pass the struct pointer into the progress function */ 131 curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &prog); 132 #endif 133 134 curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L); 135 res = curl_easy_perform(curl); 136 137 if(res != CURLE_OK) 138 fprintf(stderr, "%s\n", curl_easy_strerror(res)); 139 140 /* always cleanup */ 141 curl_easy_cleanup(curl); 142 } 143 return (int)res; 144 } 145