Re: [Factor-talk] Integer to Bytes

[Doug Coleman]

For Factor, integers are either fixnum or bignum size. For C, you tell it
how many bytes it occupies according to the C header. Generally the sizes
are the same across platforms. If they aren't, you might need two different
STRUCT: declarations like in basis/unix/stat/linux/32/32.factor
and basis/unix/stat/linux/64/64.factor.

The main point -- function signatures and struct declarations usually
handle the integer sizes and you shouldn't have to think much about it. Do
you have a specific example?
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Re: [Factor-talk] Integer to Bytes

[Alexander Ilin]

Thank you!  One more question. I want to convert an integer into a byte-array containing its bytes. In my use case it was the return value of the nano-count, but the question is general: how can I get the bytes of an integer.  For floats there are primitives like float>bits and double>bits, and for integers there is >le and >be, but for the latter two I need to specify the size in bytes. Is there a way to ask an integer how many bytes it occupies? Because from the documentation it's not clear at all how many bytes nano-count would return, and it may vary depending on the current platform. What am I missing? 23.03.2020, 03:13, "Doug Coleman" :You could do this: : SODIUM_SIZE_MAX ( -- x ) cell-bits on-bits ; where cell-bits gives 32/64 and on-bits turns them to ones.  On Sun, Mar 22, 2020 at 6:44 PM Alexander Ilin  wrote:Hello!  I'm creating the sodium library FFI for Factor, and I found the following definition in the Sodium C headers:#define SODIUM_MIN(A, B) ((A) < (B) ? (A) : (B))#define SODIUM_SIZE_MAX SODIUM_MIN(UINT64_MAX, SIZE_MAX)  I think SODIUM_SIZE_MAX is used as platform-dependent macro constant, which represents a maximum value for array sizes and similar memory limits.  It'll have the max value of the size_t type, which is either 16-bit, 32-bit or 64-bit depending on the compilation target platform.  How should I define the SODIUM_SIZE_MAX constant in Factor?---=--- Александр___Factor-talk mailing listFactor-talk@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/factor-talk,,___Factor-talk mailing listFactor-talk@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/factor-talk  ---=---Александр ___
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Re: [Factor-talk] Platform Max Int

[Doug Coleman]

You could do this:

: SODIUM_SIZE_MAX ( -- x ) cell-bits on-bits ;

where cell-bits gives 32/64 and on-bits turns them to ones.


On Sun, Mar 22, 2020 at 6:44 PM Alexander Ilin  wrote:

> Hello!
>
>   I'm creating the sodium library FFI for Factor, and I found the
> following definition in the Sodium C headers:
>
> #define SODIUM_MIN(A, B) ((A) < (B) ? (A) : (B))
> #define SODIUM_SIZE_MAX SODIUM_MIN(UINT64_MAX, SIZE_MAX)
>
>   I think SODIUM_SIZE_MAX is used as platform-dependent macro constant,
> which represents a maximum value for array sizes and similar memory limits.
>   It'll have the max value of the size_t type, which is either 16-bit,
> 32-bit or 64-bit depending on the compilation target platform.
>
>   How should I define the SODIUM_SIZE_MAX constant in Factor?
>
> ---=---
>  Александр
>
>
>
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[Factor-talk] Platform Max Int

[Alexander Ilin]

Hello!

  I'm creating the sodium library FFI for Factor, and I found the following 
definition in the Sodium C headers:

#define SODIUM_MIN(A, B) ((A) < (B) ? (A) : (B))
#define SODIUM_SIZE_MAX SODIUM_MIN(UINT64_MAX, SIZE_MAX) 

  I think SODIUM_SIZE_MAX is used as platform-dependent macro constant, which 
represents a maximum value for array sizes and similar memory limits.
  It'll have the max value of the size_t type, which is either 16-bit, 32-bit 
or 64-bit depending on the compilation target platform.

  How should I define the SODIUM_SIZE_MAX constant in Factor?

---=--- 
 Александр



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