Fix pulling a large time off the stack by using a real double. What I really need...

Fix list context with large years.

List context can now go to 2**63-513.  I don't know why that's not 2**63-1
but I'll take it.  Maybe double imprecision.

Scalar context with large years still busted.  It appears to be something
inside Perl_newSVpvf().

diff --git a/pp_sys.c b/pp_sys.c
index 74958ac..5cfe38a 100644 (file)
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -4402,6 +4402,7 @@ PP(pp_gmtime)
     Time64_T when;
     struct TM tmbuf;
     struct TM *err;
+    char *opname = PL_op->op_type == OP_LOCALTIME ? "localtime" : "gmtime";
     static const char * const dayname[] =
        {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
     static const char * const monname[] =
@@ -4413,8 +4414,14 @@ PP(pp_gmtime)
        (void)time(&now);
        when = (Time64_T)now;
     }
-    else
-       when = (Time64_T)SvNVx(POPs);
+    else {
+       double now = POPn;
+       when = (Time64_T)now;
+       if( when != now ) {
+           Perl_warner(aTHX_ packWARN(WARN_OVERFLOW),
+                       "%.0f too large for %s", now, opname);
+       }
+    }
 
     if (PL_op->op_type == OP_LOCALTIME)
         err = localtime64_r(&when, &tmbuf);
@@ -4422,7 +4429,6 @@ PP(pp_gmtime)
        err = gmtime64_r(&when, &tmbuf);
 
     if( err == NULL ) {
-       char *opname = PL_op->op_type == OP_LOCALTIME ? "localtime" : "gmtime";
        Perl_warner(aTHX_ packWARN(WARN_OVERFLOW),
                    "%s under/overflowed the year", opname);
     }
@@ -4455,7 +4461,7 @@ PP(pp_gmtime)
        mPUSHi(tmbuf.tm_hour);
        mPUSHi(tmbuf.tm_mday);
        mPUSHi(tmbuf.tm_mon);
-       mPUSHi(tmbuf.tm_year);
+       mPUSHn(tmbuf.tm_year);
        mPUSHi(tmbuf.tm_wday);
        mPUSHi(tmbuf.tm_yday);
        mPUSHi(tmbuf.tm_isdst);