timespec-add, timespec-sub: simplify

* lib/timespec-add.c (timespec_add):
* lib/timespec-sub.c (timespec_sub):
Simplify, now that INT_ADD_WRAPV and INT_SUBTRACT_WRAPV
work on unsigned integers.

1 files changed, 7 insertions, 13 deletions

diff --git a/lib/timespec-add.c b/lib/timespec-add.c
index e0a9f12e14..abee154820 100644
--- a/lib/timespec-add.c
+++ b/lib/timespec-add.c
@@ -33,36 +33,30 @@ timespec_add (struct timespec a, struct timespec b)
   int ns = a.tv_nsec + b.tv_nsec;
   int nsd = ns - TIMESPEC_HZ;
   int rns = ns;
-  time_t tmin = TYPE_MINIMUM (time_t);
-  time_t tmax = TYPE_MAXIMUM (time_t);
 
   if (0 <= nsd)
     {
       rns = nsd;
-      if (bs < tmax)
-        bs++;
+      time_t bs1;
+      if (!INT_ADD_WRAPV (bs, 1, &bs1))
+        bs = bs1;
       else if (rs < 0)
         rs++;
       else
         goto high_overflow;
     }
 
-  /* INT_ADD_WRAPV is not appropriate since time_t might be unsigned.
-     In theory time_t might be narrower than int, so plain
-     INT_ADD_OVERFLOW does not suffice.  */
-  if (! INT_ADD_OVERFLOW (rs, bs) && tmin <= rs + bs && rs + bs <= tmax)
-    rs += bs;
-  else
+  if (INT_ADD_WRAPV (rs, bs, &rs))
     {
-      if (rs < 0)
+      if (bs < 0)
         {
-          rs = tmin;
+          rs = TYPE_MINIMUM (time_t);
           rns = 0;
         }
       else
         {
         high_overflow:
-          rs = tmax;
+          rs = TYPE_MAXIMUM (time_t);
           rns = TIMESPEC_HZ - 1;
         }
     }