time: fix type conversions and compiler warnings

Fix bugs and compiler warnings on systems with 32-bit long and
64-bit time_t.

Reviewed-by: Daniel Stenberg

Closes #1499

5 files changed, 20 insertions, 17 deletions

diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c
index 12f35e412..fb3d3fec0 100644
--- a/lib/asyn-ares.c
+++ b/lib/asyn-ares.c
@@ -373,7 +373,6 @@ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
   /* Wait for the name resolve query to complete. */
   while(!result) {
     struct timeval *tvp, tv, store;
-    long timediff;
     int itimeout;
     int timeout_ms;
 
@@ -402,8 +401,13 @@ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
       result = CURLE_ABORTED_BY_CALLBACK;
     else {
       struct timeval now2 = Curl_tvnow();
-      timediff = Curl_tvdiff(now2, now); /* spent time */
-      timeout -= timediff?timediff:1; /* always deduct at least 1 */
+      time_t timediff = Curl_tvdiff(now2, now); /* spent time */
+      if(timediff <= 0)
+        timeout -= 1; /* always deduct at least 1 */
+      else if(timediff > timeout)
+        timeout = -1;
+      else
+        timeout -= (long)timediff;
       now = now2; /* for next loop */
     }
     if(timeout < 0)
diff --git a/lib/easy.c b/lib/easy.c
index 46c0a9911..2b1ce9e8a 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -615,12 +615,18 @@ static CURLcode wait_or_timeout(struct Curl_multi *multi, struct events *ev)
         }
       }
 
-      if(!ev->msbump)
+      if(!ev->msbump) {
         /* If nothing updated the timeout, we decrease it by the spent time.
          * If it was updated, it has the new timeout time stored already.
          */
-        ev->ms += (long)curlx_tvdiff(after, before);
-
+        time_t timediff = curlx_tvdiff(after, before);
+        if(timediff > 0) {
+          if(timediff > ev->ms)
+            ev->ms = 0;
+          else
+            ev->ms -= (long)timediff;
+        }
+      }
     }
     else
       return CURLE_RECV_ERROR;
diff --git a/lib/hostip.c b/lib/hostip.c
index 21baf6015..619ec84b5 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -596,7 +596,7 @@ int Curl_resolv_timeout(struct connectdata *conn,
     /* Ignore the timeout when signals are disabled */
     timeout = 0;
   else
-    timeout = timeoutms;
+    timeout = (timeoutms > LONG_MAX) ? LONG_MAX : (long)timeoutms;
 
   if(!timeout)
     /* USE_ALARM_TIMEOUT defined, but no timeout actually requested */
@@ -688,10 +688,11 @@ clean_up:
      the time we spent until now! */
   if(prev_alarm) {
     /* there was an alarm() set before us, now put it back */
-    unsigned long elapsed_ms = Curl_tvdiff(Curl_tvnow(), conn->created);
+    unsigned long elapsed_secs = (unsigned long) (Curl_tvdiff(Curl_tvnow(),
+                                   conn->created) / 1000);
 
     /* the alarm period is counted in even number of seconds */
-    unsigned long alarm_set = prev_alarm - elapsed_ms/1000;
+    unsigned long alarm_set = prev_alarm - elapsed_secs;
 
     if(!alarm_set ||
        ((alarm_set >= 0x80000000) && (prev_alarm < 0x80000000)) ) {
diff --git a/lib/timeval.c b/lib/timeval.c
index 0d6036b81..bed44c573 100644
--- a/lib/timeval.c
+++ b/lib/timeval.c
@@ -141,9 +141,3 @@ double curlx_tvdiff_secs(struct timeval newer, struct timeval older)
       (double)(newer.tv_usec-older.tv_usec)/1000000.0;
   return (double)(newer.tv_usec-older.tv_usec)/1000000.0;
 }
-
-/* return the number of seconds in the given input timeval struct */
-time_t Curl_tvlong(struct timeval t1)
-{
-  return t1.tv_sec;
-}
diff --git a/lib/timeval.h b/lib/timeval.h
index 09f8b3a20..33969354d 100644
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -46,8 +46,6 @@ time_t curlx_tvdiff(struct timeval t1, struct timeval t2);
  */
 double curlx_tvdiff_secs(struct timeval t1, struct timeval t2);
 
-time_t Curl_tvlong(struct timeval t1);
-
 /* These two defines below exist to provide the older API for library
    internals only. */
 #define Curl_tvnow() curlx_tvnow()