Cherry-pick 275926@main (65fd9be). https://bugs.webkit.org/show_bug.c…

…gi?id=270769

    [JSC][Clang] DatePrototype.cpp(337,29): error: 'snprintf' will always be truncated; specified size is 28, but format string expands to at least 29 [-Werror,-Wformat-truncation]
    https://bugs.webkit.org/show_bug.cgi?id=270769

    Reviewed by Don Olmstead.

    Clang 18 reports a false warning:

    > JavaScriptCore/runtime/DatePrototype.cpp(337,29): error: 'snprintf' will always be truncated; specified size is 28, but format string expands to at least 29 [-Werror,-Wformat-truncation]

    This problem is tracked by <llvm/llvm-project#71320>.

    * Source/JavaScriptCore/runtime/DatePrototype.cpp:
    Ignore the warning for Clang.

    Canonical link: https://commits.webkit.org/275926@main

Canonical link: https://commits.webkit.org/274313.90@webkitglib/2.44

Source/JavaScriptCore/runtime/DatePrototype.cpp

@@ -333,9 +333,11 @@ JSC_DEFINE_HOST_FUNCTION(dateProtoFuncToISOString, (JSGlobalObject* globalObject
         ms += msPerSecond;
 
     int charactersWritten;
-    if (gregorianDateTime->year() > 9999 || gregorianDateTime->year() < 0)
+    if (gregorianDateTime->year() > 9999 || gregorianDateTime->year() < 0) {
+        IGNORE_CLANG_WARNINGS_BEGIN("format-truncation"); // for Clang 18
         charactersWritten = snprintf(buffer, sizeof(buffer), "%+07d-%02d-%02dT%02d:%02d:%02d.%03dZ", gregorianDateTime->year(), gregorianDateTime->month() + 1, gregorianDateTime->monthDay(), gregorianDateTime->hour(), gregorianDateTime->minute(), gregorianDateTime->second(), ms);
-    else
+        IGNORE_CLANG_WARNINGS_END;
+    } else
         charactersWritten = snprintf(buffer, sizeof(buffer), "%04d-%02d-%02dT%02d:%02d:%02d.%03dZ", gregorianDateTime->year(), gregorianDateTime->month() + 1, gregorianDateTime->monthDay(), gregorianDateTime->hour(), gregorianDateTime->minute(), gregorianDateTime->second(), ms);
 
     ASSERT(charactersWritten > 0 && static_cast<unsigned>(charactersWritten) < sizeof(buffer));