From: Martin DeMello <martindemello@...>
Date: 2009-06-12T22:55:19+09:00
Subject: Re: wrapping a C struct[] constant

On Fri, Jun 12, 2009 at 5:12 PM, Eero Saynatkari<ruby-ml@kittensoft.org> wrote:
> Martin DeMello wrote:
>> I have some C code with a struct definition
>>
>> struct flag_str {
>>   unsigned int val;
>>   const char *str;
>> };
>>
>> and an inline array
>>
>> struct flag_str extent_flags[] = {
>>   { FIEMAP_EXTENT_LAST,    "last" },
>>   { FIEMAP_EXTENT_UNKNOWN,  "unkown" },
>>   { FIEMAP_EXTENT_DELALLOC,  "delalloc" },
>>   { FIEMAP_EXTENT_NO_BYPASS,  "no_bypass" },
>>   { FIEMAP_EXTENT_SECONDARY,  "secondary" },
>>   { FIEMAP_EXTENT_NET,    "net" },
>>   { FIEMAP_EXTENT_DATA_COMPRESSED, "data_compressed" },
>>   { FIEMAP_EXTENT_DATA_ENCRYPTED, "data_encrypted" },
>>   { FIEMAP_EXTENT_NOT_ALIGNED,  "not_aligned" },
>>   { FIEMAP_EXTENT_DATA_INLINE,  "data_inline" },
>>   { FIEMAP_EXTENT_DATA_TAIL,  "data_tail" },
>>   { FIEMAP_EXTENT_UNWRITTEN,  "unwritten" },
>>   { FIEMAP_EXTENT_MERGED,    "merged" },
>>   { 0,        NULL },
>> };
>>
>> What's the simplest way to expose that array as a ruby constant (other
>> than just copy/pasting the data, of course :))?
>
> How/where are you *using* it?

Using it (or want to use it!) from the ruby side to generate a hash of
constant => name and use that to unpack and display flag settings.

m.