[#45426] [ruby-trunk - Feature #6546][Open] Net::HTTP to check for HTTP_PROXY environment setting. — "dekz (Jacob Evans)" <dekzter@...>

14 messages 2012/06/04

[#45431] [ruby-trunk - Bug #6548][Open] Rake doesn't ignore arguments after -- — "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>

12 messages 2012/06/05

[#45474] [ANN] Request for "slide-show" of your feature proposal — Yusuke Endoh <mame@...>

(Japanese later; 日本語が後にあります)

18 messages 2012/06/07

[#45563] [ruby-trunk - Bug #6573][Open] Webrick test failures — "bkabrda (Bohuslav Kabrda)" <bkabrda@...>

19 messages 2012/06/11

[#45567] [ruby-trunk - Bug #6575][Open] Thread#kill sets rb_errinfo() to Fixnum 8 after rb_protect(function, data, &error_tag) — ibc (Iñaki Baz Castillo) <ibc@...>

9 messages 2012/06/11

[#45647] [ruby-trunk - Bug #6592][Open] test_call_double(DL::TestDL) fails on ARM HardFP — "vo.x (Vit Ondruch)" <v.ondruch@...>

15 messages 2012/06/14

[#45657] [ruby-trunk - Feature #6594][Open] Integrated Functor — "trans (Thomas Sawyer)" <transfire@...>

20 messages 2012/06/15

[#45664] [ruby-trunk - Bug #6596][Open] New method for Arrays : Array#index — "robin850 (Robin Dupret)" <robin.dupret@...>

20 messages 2012/06/15

[#45694] [ruby-trunk - Feature #6602][Open] Tail call optimization: enable by default? — "ko1 (Koichi Sasada)" <redmine@...>

12 messages 2012/06/18

[#45715] [ruby-trunk - Feature #6609][Open] Toplevel as self extended module — "trans (Thomas Sawyer)" <transfire@...>

17 messages 2012/06/19

[#45732] [ruby-trunk - Bug #6614][Open] GC doesn't collect objects bound to (collectable) proc — "rogerdpack (Roger Pack)" <rogerpack2005@...>

9 messages 2012/06/20

[#45733] [ruby-trunk - Feature #6615][Open] Release GVL in zlib when calling inflate() or deflate() — "drbrain (Eric Hodel)" <drbrain@...7.net>

12 messages 2012/06/21

[#45735] [ruby-trunk - Bug #6616][Open] MinGW: cannot build extensions or run tests due changes in exec_arg? — "luislavena (Luis Lavena)" <luislavena@...>

9 messages 2012/06/21

[#45798] [ruby-trunk - Bug #6634][Open] Deadlock with join and ConditionVariable — "meh. (meh. I don't care)" <meh@...>

20 messages 2012/06/23

[#45805] [ruby-trunk - Feature #6636][Open] Enumerable#size — "marcandre (Marc-Andre Lafortune)" <ruby-core@...>

15 messages 2012/06/23

[#45864] [ruby-trunk - Bug #6647][Open] Exceptions raised in threads should be logged — "headius (Charles Nutter)" <headius@...>

71 messages 2012/06/25

[#45902] [ruby-trunk - Bug #6653][Open] 1.9.2/1.9.3 exhibit SEGV with many threads+tcp connections — "erikh (Erik Hollensbe)" <erik@...>

11 messages 2012/06/26

[#45960] [ruby-trunk - Feature #6669][Open] A method like Hash#map but returns hash — "yhara (Yutaka HARA)" <redmine@...>

18 messages 2012/06/29

[#45963] [ruby-trunk - Feature #6670][Open] str.chars.last should be possible — "yhara (Yutaka HARA)" <redmine@...>

36 messages 2012/06/29

[#46021] [ruby-trunk - Feature #6679][Open] Default Ruby source file encoding to utf-8 — "claytrump (Clay Trump)" <clay.trump@...>

21 messages 2012/06/30

[ruby-core:45790] How can i access ruby array element in C from ruby source code array.c?

From: gmspro <gmspro@...>
Date: 2012-06-23 06:08:24 UTC
List: ruby-core #45790
        Hi, I'm trying to get the value of a array from ruby source code,
That is array.c

./ruby
arr=Array.new(3)
arr[0]=5
arr[1]=3
arr[2]=2


These lines should call this function, https://github.com/ruby/ruby/blob/trunk/array.c#L568 according to this, http://www.ruby-doc.org/core-1.9.3/Array.html
 

So I have added couple of lines there to display the values of array. But i didn't get the expected result.

else {
memfill(RARRAY_PTR(ary), len, val);
ARY_SET_LEN(ary, len);
int i;
int result;
result = 0;
VALUE *s_arr = RARRAY_PTR(ary);
for(i = 0; i < len; i++) {
result = LONG2NUM(s_arr[i]);
printf("r: %d\n",result);
}
}


I got the result like this:

arr=Array.new(3)
arr[0]=5
arr[1]=3
arr[2]=2
r: 9
r: 9
r: 9


Why is this result? Why 9?

I have followed these to solve it:

How to convert ruby array to C array with RubyInline?https://github.com/ruby/ruby/blob/trunk/README.EXT#L131https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L708https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L731

I also try editing/customizing array.c:rb_ary_aset function like this:
static VALUE
rb_ary_aset(int argc, VALUE *argv, VALUE ary)
{
long offset, beg, len;

if (argc == 3) {
rb_ary_modify_check(ary);
beg = NUM2LONG(argv[0]);
len = NUM2LONG(argv[1]);
rb_ary_splice(ary, beg, len, argv[2]);
return argv[2];
}
if (argc != 2) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2)", argc);
}
rb_ary_modify_check(ary);
if (FIXNUM_P(argv[0])) {
offset = FIX2LONG(argv[0]);
goto fixnum;
}
if (rb_range_beg_len(argv[0], &beg, &len, RARRAY_LEN(ary), 1)) {
/* check if idx is Range */
rb_ary_splice(ary, beg, len, argv[1]);

return argv[1];
}
offset = NUM2LONG(argv[0]);
fixnum:
rb_ary_store(ary, offset, argv[1]);
VALUE s;
int temp,i;
for (i=0; i<RARRAY_LEN(ary); i++) {
s = rb_inspect(RARRAY_PTR(ary)[i]);
switch (TYPE(s)) {
case T_FIXNUM:
temp=0;
break;
case T_STRING:
temp=1;
break;
case T_ARRAY:
temp=2;
break;
case T_BIGNUM:
temp=3;
break;
default:
temp=4;
rb_raise(rb_eTypeError, "not valid value");
break;
}
}
return argv[1];


Still i can't understand how to get the value casting from VALUE var to int var.

Can anyone please help to display/printf the value of Ruby array in C?
Someone please reply.
Any answer would be highly appreciated.
Thanks in advance.





    

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