[flang-commits] [flang] [flang][runtime] Fix integer overflow check for FORMATs (PR #79471)

[Slava Zakharin via flang-commits]

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@@ -85,8 +85,8 @@ int FormatControl<CONTEXT>::GetIntField(
     ch = PeekNext();
   }
   while (ch >= '0' && ch <= '9') {
-    if (result >
-        std::numeric_limits<int>::max() / 10 - (static_cast<int>(ch) - '0')) {
+    constexpr int tenth{std::numeric_limits<int>::max() / 10};
+    if (result > tenth || ch - '0' > std::numeric_limits<int>::max() - result) {
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vzakhari wrote:

Not sure, but shouldn't it look like `|| ch - '0' > std::numeric_limits<int>::max() - result * 10`?

https://github.com/llvm/llvm-project/pull/79471