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d36940992e
Create own blocks for all the parts dealing with FILE*: this way there is no need to recycle the same FILE* variable for all the operations, and have each block its own variable automatically cleaned up. This also fixes a potential undefined behaviour on error: POSIX says that after a call fclose(), a FILE* cannot be used anymore, not even on fclose() failure. The previous behaviour for fclose == -1 was to jump to the error label, which would then try to call fclose() again (since the FILE* pointer was still non-null).