Re: [PATCH 6/6] strbuf-safe: add init and release methods

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> +int jw_release(struct json_writer *jw)
>>  {
>> -	strbuf_release(&jw->json);
>> -	strbuf_release(&jw->open_stack);
>> +	enum safe_result result = SUCCESS;
>> +
>> +	/* attempt both removals without short-circuiting. */
>> +	result = sstrbuf_release(&jw->json) || result;
>> +	result = sstrbuf_release(&jw->open_stack) || result;
>> +
>> +	return result;
>>  }
>
> This is puzzling in a few ways.
> If we mean "enum safe_result" is an enumeration of different kinds
> of errors, then the "result" variable and the returned value from
> ...
> On the other hand, if we mean "enum safe_result" is an enumeration
> of bitmasks, each bit representing different kind of error, then
> ...

I forgot the third possibility.  Regardless of which interpretation
of "enum safe_result" we use, if jw_release() is designed to say "0
for success, non-zero for failure", then almost as written but
declaring "result" as a plain "int"

    int result = 0;

    result = sstrbuf_release(&jw->json) || result;
    result = sstrbuf_release(&jw->open_stack) || result;

    return result;

would probably make sense, even though the "|| result" construct is
a bit unusual in C.

Thanks.