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From: Оля Тележная  <olyatelezhnaya@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git <git@vger.kernel.org>
Subject: Re: [PATCH v5 1/6] strbuf: add shortcut to work with error messages
Date: Fri, 23 Mar 2018 09:48:41 +0300
Message-ID: <CAL21Bm=M-X8pjnxKzXKZbwArF6gyoPLLLa8JBZFNrvwrsRsacg@mail.gmail.com> (raw)
In-Reply-To: <xmqqlgelnpsx.fsf@gitster-ct.c.googlers.com>

2018-03-21 23:20 GMT+03:00 Junio C Hamano <gitster@pobox.com>:
> Olga Telezhnaya <olyatelezhnaya@gmail.com> writes:
>
>> Add function strbuf_error() that helps to save few lines of code.
>> Function expands fmt with placeholders, append resulting error message
>> to strbuf *err, and return error code ret.
>>
>> Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com>
>> ---
>>  strbuf.h | 13 +++++++++++++
>>  1 file changed, 13 insertions(+)
>>
>> diff --git a/strbuf.h b/strbuf.h
>> index e6cae5f4398c8..fa66d4835f1a7 100644
>> --- a/strbuf.h
>> +++ b/strbuf.h
>> @@ -620,4 +620,17 @@ char *xstrvfmt(const char *fmt, va_list ap);
>>  __attribute__((format (printf, 1, 2)))
>>  char *xstrfmt(const char *fmt, ...);
>>
>> +/*
>> + * Expand error message, append it to strbuf *err, then return error code ret.
>> + * Allow to save few lines of code.
>> + */
>> +static inline int strbuf_error(struct strbuf *err, int ret, const char *fmt, ...)
>> +{
>
> With this function, err does not have to be an error message, and
> ret does not have to be negative.  Hence strbuf_error() is a wrong
> name for the wrapper.
>
> It somewhat is bothersome to see that this is inlined; if it is
> meant for error codepath, it probably shouldn't have to be.
>
>> +     va_list ap;
>> +     va_start(ap, fmt);
>> +     strbuf_vaddf(err, fmt, ap);
>> +     va_end(ap);
>> +     return ret;
>> +}
>> +
>>  #endif /* STRBUF_H */
>
> Quite honestly, I am not sure if it is worth to be in strbuf.h; it
> feels a bit too specific to the immediate need for these five
> patches and nowhere else.  Are there many existing calls to
> strbuf_addf() immediately followed by an "return" of an integer,
> that can be simplified by using this helper?  I see quite a many
> instances of addf() soon followed by "return -1" in
> refs/files-backend.c, but they are not immediately adjacent to each
> other, and won't be helped.

Summarizing all that we discussed: I have 2 options how to continue
this patch. I can revert to v4, or I can replace new function in
strbuf.h with similar macro in ref-filter.c (I mean, there would be no
changes in strbuf.h and one new macro in ref-filter.c). What do you
like more?

Thanks!
Olga

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-13 10:16 [RFC 1/4] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-13 10:16 ` [RFC 4/4] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-13 10:16 ` [RFC 2/4] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-13 19:13   ` Martin Ågren
2018-03-13 10:16 ` [RFC 3/4] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-13 19:18   ` Martin Ågren
2018-03-14 13:36     ` Оля Тележная
2018-03-13 19:12 ` [RFC 1/4] ref-filter: start adding strbufs with errors Martin Ågren
2018-03-14 13:30   ` Оля Тележная
2018-03-14 19:04 ` [PATCH v2 1/5] " Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-15 22:48     ` Junio C Hamano
2018-03-16  7:22       ` Оля Тележная
2018-03-14 19:04   ` [PATCH v2 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-15 20:47     ` Martin Ågren
2018-03-15 21:01       ` Eric Sunshine
2018-03-16  7:20         ` Оля Тележная
2018-03-15 21:05       ` Junio C Hamano
2018-03-16  7:17       ` Оля Тележная
2018-03-19 13:01   ` [PATCH v3 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-19 19:41       ` Junio C Hamano
2018-03-19 13:01     ` [PATCH v3 5/5] ref-filter: get_ref_atom_value() " Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-19 19:24       ` Junio C Hamano
2018-03-20 16:05     ` [PATCH v4 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 5/5] ref-filter: get_ref_atom_value() " Olga Telezhnaya
2018-03-20 18:19         ` Eric Sunshine
2018-03-20 22:30           ` Junio C Hamano
2018-03-20 22:50             ` Eric Sunshine
2018-03-21 19:30               ` Junio C Hamano
2018-03-21 19:58                 ` Eric Sunshine
2018-03-20 16:05       ` [PATCH v4 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-20 18:18         ` Eric Sunshine
2018-03-21 18:28       ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 4/6] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-21 20:36           ` Junio C Hamano
2018-03-23  6:56             ` Оля Тележная
2018-03-21 18:28         ` [PATCH v5 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-21 20:20         ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Junio C Hamano
2018-03-23  6:48           ` Оля Тележная [this message]
2018-03-29 12:49         ` [PATCH v6 1/6] ref-filter: add shortcut to work with strbufs Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 4/6] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya

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