[Tarantool-patches] [PATCH v1 1/4] decimal: introduce decimal_is_neg()

[Safin Timur]

LGTM, though...

On 16.08.2021 18:57, Mergen Imeev via Tarantool-patches wrote:
> This patch introduces function decimal_is_neg() which checks that
> decimal is less than zero.
> 
> Needed for #4415
> ---
>   src/lib/core/decimal.c   |  6 ++++++
>   src/lib/core/decimal.h   |  4 ++++
>   test/unit/decimal.c      |  7 ++++++-
>   test/unit/decimal.result | 10 +++++++++-
>   4 files changed, 25 insertions(+), 2 deletions(-)
> 
> diff --git a/src/lib/core/decimal.c b/src/lib/core/decimal.c
> index 6d2ccb96f..7543ef44d 100644
> --- a/src/lib/core/decimal.c
> +++ b/src/lib/core/decimal.c
> @@ -115,6 +115,12 @@ decimal_is_int(decimal_t *dec)
>   	return decNumberIsInt(dec);
>   }
>   
> +bool
> +decimal_is_neg(const decimal_t *dec)
> +{
> +	return decNumberIsNegative(dec) && !decNumberIsZero(dec);
> +}
> +

^^ here was a good place for decimal_to_string()

>   decimal_t *
>   decimal_from_string(decimal_t *dec, const char *str)
>   {
> diff --git a/src/lib/core/decimal.h b/src/lib/core/decimal.h
> index aeafd2c68..15a576648 100644
> --- a/src/lib/core/decimal.h
> +++ b/src/lib/core/decimal.h
> @@ -81,6 +81,10 @@ decimal_zero(decimal_t *dec);
>   bool
>   decimal_is_int(decimal_t *dec);
>   
> +/** @return true if the decimal is negative, false otherwise. */
> +bool
> +decimal_is_neg(const decimal_t *dec);
> +
>   /**
>    * Initialize a decimal with a value from the string.
>    *
> diff --git a/test/unit/decimal.c b/test/unit/decimal.c
> index aea646e15..328b1b668 100644
> --- a/test/unit/decimal.c
> +++ b/test/unit/decimal.c
> @@ -336,7 +336,7 @@ test_mp_print(void)
>   int
>   main(void)
>   {
> -	plan(304);
> +	plan(312);
>   
>   	dectest(314, 271, uint64, uint64_t);
>   	dectest(65535, 23456, uint64, uint64_t);
> @@ -416,5 +416,10 @@ main(void)
>   	dectest_is(is_int, 1.0000, true);
>   	dectest_is(is_int, 1.0000001, false);
>   
> +	dectest_is(is_neg, 1, false);
> +	dectest_is(is_neg, -1, true);
> +	dectest_is(is_neg, 0, false);
> +	dectest_is(is_neg, -0, false);
> +
>   	return check_plan();
>   }
> diff --git a/test/unit/decimal.result b/test/unit/decimal.result
> index b7da2d2ce..ceaaf718a 100644
> --- a/test/unit/decimal.result
> +++ b/test/unit/decimal.result
> @@ -1,4 +1,4 @@
> -1..304
> +1..312
>   ok 1 - decimal(314)
>   ok 2 - decimal(271)
>   ok 3 - decimal(314) + decimal(271)
> @@ -747,3 +747,11 @@ ok 301 - decimal_from_string(1.0000)
>   ok 302 - decimal_is_int(1.0000) - expected true
>   ok 303 - decimal_from_string(1.0000001)
>   ok 304 - decimal_is_int(1.0000001) - expected false
> +ok 305 - decimal_from_string(1)
> +ok 306 - decimal_is_neg(1) - expected false
> +ok 307 - decimal_from_string(-1)
> +ok 308 - decimal_is_neg(-1) - expected true
> +ok 309 - decimal_from_string(0)
> +ok 310 - decimal_is_neg(0) - expected false
> +ok 311 - decimal_from_string(-0)
> +ok 312 - decimal_is_neg(-0) - expected false
>