changes from feedback

Author: devnexen

main/reallocarray.c

@@ -22,13 +22,14 @@
 
 PHPAPI void* php_reallocarray(void *p, size_t nmb, size_t siz)
 {
-#ifndef _WIN32
 	size_t r;
+#ifndef _WIN32
 	if (__builtin_mul_overflow(nmb, siz, &r)) {
 #else
-        // nmb an siz must be lower than sqrt SIZE_MAX+1
-        static size_t elim = 1UL << (sizeof(size_t) * CHAR_BIT / 2);
-	if ((nmb >= elim || siz >= elim) && nmb > 0  && SIZE_MAX / nmb < siz) {
+	
+        // nmb and siz must be lower than sqrt SIZE_MAX+1
+	r = siz * nmb;
+	if (siz != 0 && r / siz != nmb) {
 #endif
 		// EOVERFLOW may have been, arguably, more appropriate
 		// but this is what other implementations set