time: support > year 2038 time stamps for system with 32bit long

... with the introduction of CURLOPT_TIMEVALUE_LARGE and
CURLINFO_FILETIME_T.

Fixes #2238
Closes #2264

5 files changed, 30 insertions, 11 deletions

diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 100b8d40f..ecc0bb3df 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -438,7 +438,7 @@
 #  define TIME_T_MIN 0
 #  else
 #  define TIME_T_MAX 0x7FFFFFFFFFFFFFFF
-#  define TIME_T_MIN -0x10000000000000000
+#  define TIME_T_MIN (-TIME_T_MAX - 1)
 #  endif
 #endif
 
diff --git a/lib/getinfo.c b/lib/getinfo.c
index 862ced019..d280eebfa 100644
--- a/lib/getinfo.c
+++ b/lib/getinfo.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, 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
@@ -156,7 +156,12 @@ static CURLcode getinfo_long(struct Curl_easy *data, CURLINFO info,
     *param_longp = data->info.httpproxycode;
     break;
   case CURLINFO_FILETIME:
-    *param_longp = data->info.filetime;
+    if(data->info.filetime > LONG_MAX)
+      *param_longp = LONG_MAX;
+    else if(data->info.filetime < LONG_MIN)
+      *param_longp = LONG_MIN;
+    else
+      *param_longp = (long)data->info.filetime;
     break;
   case CURLINFO_HEADER_SIZE:
     *param_longp = data->info.header_size;
@@ -253,6 +258,9 @@ static CURLcode getinfo_offt(struct Curl_easy *data, CURLINFO info,
                              curl_off_t *param_offt)
 {
   switch(info) {
+  case CURLINFO_FILETIME_T:
+    *param_offt = (curl_off_t)data->info.filetime;
+    break;
   case CURLINFO_SIZE_UPLOAD_T:
     *param_offt = data->progress.uploaded;
     break;
diff --git a/lib/setopt.c b/lib/setopt.c
index a5ef75c72..686e9dbce 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -361,6 +361,14 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option,
     data->set.timevalue = (time_t)va_arg(param, long);
     break;
 
+  case CURLOPT_TIMEVALUE_LARGE:
+    /*
+     * This is the value to compare with the remote document with the
+     * method set with CURLOPT_TIMECONDITION
+     */
+    data->set.timevalue = (time_t)va_arg(param, curl_off_t);
+    break;
+
   case CURLOPT_SSLVERSION:
   case CURLOPT_PROXY_SSLVERSION:
     /*
diff --git a/lib/smb.c b/lib/smb.c
index 6cb4083bb..e5ac5d76a 100644
--- a/lib/smb.c
+++ b/lib/smb.c
@@ -709,14 +709,19 @@ static CURLcode smb_connection_state(struct connectdata *conn, bool *done)
 }
 
 /*
- * Convert a timestamp from the Windows world (100 nsec units from
- * 1 Jan 1601) to Posix time.
+ * Convert a timestamp from the Windows world (100 nsec units from 1 Jan 1601)
+ * to Posix time. Cap the output to fit within a time_t.
  */
-static void get_posix_time(long *out, curl_off_t timestamp)
+static void get_posix_time(time_t *out, curl_off_t timestamp)
 {
   timestamp -= 116444736000000000;
   timestamp /= 10000000;
-  *out = (long) timestamp;
+  if(timestamp > TIME_T_MAX)
+    *out = TIME_T_MAX;
+  else if(timestamp < TIME_T_MIN)
+    *out = TIME_T_MIN;
+  else
+    *out = (time_t) timestamp;
 }
 
 static CURLcode smb_request_state(struct connectdata *conn, bool *done)
diff --git a/lib/urldata.h b/lib/urldata.h
index 5c04ad172..6c594fe8d 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1024,10 +1024,8 @@ struct PureInfo {
   int httpcode;  /* Recent HTTP, FTP, RTSP or SMTP response code */
   int httpproxycode; /* response code from proxy when received separate */
   int httpversion; /* the http version number X.Y = X*10+Y */
-  long filetime; /* If requested, this is might get set. Set to -1 if the time
-                    was unretrievable. We cannot have this of type time_t,
-                    since time_t is unsigned on several platforms such as
-                    OpenVMS. */
+  time_t filetime; /* If requested, this is might get set. Set to -1 if the
+                      time was unretrievable. */
   bool timecond;  /* set to TRUE if the time condition didn't match, which
                      thus made the document NOT get fetched */
   long header_size;  /* size of read header(s) in bytes */