casting date to time_delta does NOT change the value

it only changes the precision, and that's only used for
printing / parsing.  Internally, all different-precision dates
and time_deltas are stored as 64-bit integers in nanoseconds

and the same goes for date --> time_delta

diff --git a/src/lib/util/value.c b/src/lib/util/value.c
index ef780e6b970e9d17f5c8cad0b09751e2bf2ba57f..859f4a9942645df7e7cf3dba5caa7b0903865df0 100644 (file)
--- a/src/lib/util/value.c
+++ b/src/lib/util/value.c
@@ -3255,7 +3255,54 @@ int fr_value_box_cast(TALLOC_CTX *ctx, fr_value_box_t *dst,
        case FR_TYPE_BOOL:
                return fr_value_box_cast_to_bool(ctx, dst, dst_type, dst_enumv, src);
 
-       case FR_TYPE_INTEGER_EXCEPT_BOOL:
+       case FR_TYPE_DATE:
+               if (src->type != FR_TYPE_TIME_DELTA) return fr_value_box_cast_to_integer(ctx, dst, dst_type, dst_enumv, src);
+
+               if (fr_time_delta_isneg(src->vb_time_delta)) {
+                       fr_strerror_const("Input to data type would underflow");
+                       return -1;
+               }
+
+               dst->type = dst_type;
+               dst->enumv = dst_enumv;
+               dst->vb_date = fr_unix_time_wrap(fr_time_delta_unwrap(src->vb_time_delta));
+               return 0;
+
+               break;
+
+       case FR_TYPE_TIME_DELTA:
+               /*
+                *      Unix time cast to time_delta is just nanoseconds since the epoch.
+                *
+                *      Note that we do NOT change time resolution, but we DO change enumv.  Both unix time
+                *      and time_delta are tracked internally as nanoseconds, and the only use of precision is
+                *      for printing / parsing.
+                */
+               if (src->type == FR_TYPE_DATE) {
+                       uint64_t when;
+
+                       when = fr_unix_time_unwrap(src->vb_date);
+                       if (when > INT64_MAX) {
+                               fr_strerror_const("Input to data type would overflow");
+                               return -1;
+                       }
+
+                       dst->type = dst_type;
+                       dst->enumv = dst_enumv;
+                       dst->vb_time_delta = fr_time_delta_wrap((int64_t) when);
+                       return 0;
+               }
+               FALL_THROUGH;
+
+       case FR_TYPE_UINT8:
+       case FR_TYPE_UINT16:
+       case FR_TYPE_UINT32:
+       case FR_TYPE_UINT64:
+       case FR_TYPE_INT8:
+       case FR_TYPE_INT16:
+       case FR_TYPE_INT32:
+       case FR_TYPE_INT64:
+       case FR_TYPE_SIZE:
                return fr_value_box_cast_to_integer(ctx, dst, dst_type, dst_enumv, src);
 
        case FR_TYPE_FLOAT32: