Prefix octal numbers with 0

Author: phst

elisp/private/tools/system.cc

@@ -819,7 +819,7 @@ static absl::Status CopyTreePosix(const int from_parent,
       if (!status.ok()) return status;
     } else {
       return absl::FailedPreconditionError(absl::StrFormat(
-          "File %s with mode %04o cannot be copied", name, mode));
+          "File %s with mode 0%03o cannot be copied", name, mode));
     }
   }
 

elisp/private/tools/system.h

@@ -202,7 +202,7 @@ struct ArgFormatter final {
   }
 
   void operator()(std::string* const absl_nonnull out, const Oct number) const {
-    absl::StrAppendFormat(out, "%04o", number.value);
+    absl::StrAppendFormat(out, "0%03o", number.value);
   }
 };