[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 4/7] qapi: String visitor, use %f represenation
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] [PATCH 4/7] qapi: String visitor, use %f represenation for floats |
Date: |
Fri, 11 May 2012 13:34:01 -0300 |
On Fri, 27 Apr 2012 15:21:20 -0500
Michael Roth <address@hidden> wrote:
> Currently string-output-visitor formats floats as %g, which is nice in
> that trailing 0's are automatically truncated, but otherwise this causes
> some issues:
>
> - it 6 uses significant figures instead of 6 decimal places, which
> means something like 155777.5 (which even has an exact floating point
> representation) will be rounded to 155778 when converted to a string.
>
> - output will be presented in scientific notation when the normalized
> form requires a 10^x multiplier. Not a huge deal, but arguably less
> readable for command-line arguments.
>
> - due to using sig figs instead of hard-defined decimal places, it
> fails a lot of the test-visitor-serialization unit tests for floats.
>
> Instead, let's just use %f, which is what the QJSON and the QMP visitors
> use.
>
> Signed-off-by: Michael Roth <address@hidden>
> ---
> qapi/string-output-visitor.c | 2 +-
> tests/test-string-output-visitor.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/qapi/string-output-visitor.c b/qapi/string-output-visitor.c
> index 92b0305..34e525e 100644
> --- a/qapi/string-output-visitor.c
> +++ b/qapi/string-output-visitor.c
> @@ -52,7 +52,7 @@ static void print_type_number(Visitor *v, double *obj,
> const char *name,
> Error **errp)
> {
> StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
> - string_output_set(sov, g_strdup_printf("%g", *obj));
> + string_output_set(sov, g_strdup_printf("%f", *obj));
Doesn't look like a bug fix worth it for 1.1, am I wrong?
> }
>
> char *string_output_get_string(StringOutputVisitor *sov)
> diff --git a/tests/test-string-output-visitor.c
> b/tests/test-string-output-visitor.c
> index 22909b8..608f14a 100644
> --- a/tests/test-string-output-visitor.c
> +++ b/tests/test-string-output-visitor.c
> @@ -84,7 +84,7 @@ static void test_visitor_out_number(TestOutputVisitorData
> *data,
>
> str = string_output_get_string(data->sov);
> g_assert(str != NULL);
> - g_assert_cmpstr(str, ==, "3.14");
> + g_assert_cmpstr(str, ==, "3.140000");
> g_free(str);
> }
>
- Re: [Qemu-devel] [PATCH 4/7] qapi: String visitor, use %f represenation for floats,
Luiz Capitulino <=