Fix #80007: Potential type confusion in unixtojd() parameter parsing

Also it fixes test on 32-bit armv7 and x86
- Test unixtojd() function : error conditions [ext/calendar/tests/unixtojd_error1.phpt]

Closes phpGH-6033

Author: andypost

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
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 ?? ??? ????, PHP 7.3.23
 
+- Calendar:
+  . Fixed bug #80007 (Potential type confusion in unixtojd() parameter parsing).
+    (Andy Postnikov)
 
 03 Sep 2020, PHP 7.3.22
 

ext/calendar/cal_unix.c

@@ -28,15 +28,18 @@
 PHP_FUNCTION(unixtojd)
 {
 	time_t ts = 0;
+	zend_long tl = 0;
 	struct tm *ta, tmbuf;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l", &ts) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l", &tl) == FAILURE) {
 		return;
 	}
 
-	if (!ts) {
+	if (!tl) {
 		ts = time(NULL);
-	} else if (ts < 0) {
+	} else if (tl >= 0) {
+		ts = (time_t) tl;
+	} else {
 		RETURN_FALSE;
 	}