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printf の変換の指定を、適切と思われるものに修正しました。
1件目のコミット (Fix printf conversion for header dump) は、C99 未満の環境も考慮して、 %td を用いず long に型変換して %ld を使うようにしました。
2・3件目のコミットは、確認できた範囲では 64bit (LP64) 環境では off_t・uint64_t が (unsigned) long に typedef されているようでしたので、使い分けの条件を見直しました。
LP64 でも off_t・uint64_t が (unsigned) long long に typedef されていると逆に問題となってしまうかも知れませんが、そのような環境はあるのでしょうか…?