From: Yusuke ENDOH <mame@...>
Date: 2010-07-09T22:43:38+09:00
Subject: [ruby-core:31158] Re: Why is there no standard way of creating a 	String from a char *?

Hi,

2010/7/9 Nikolai Weibull <now@bitwi.se>:
> I�m sorry for being so slow to understand, but I still don�t see why
> Ruby can�t use the char * that I�ve malloced myself. ?I want to be
> able to tell Ruby that �here, take this char *, I own it, no one else
> knows about it, guaranteed, and I�m now giving it to you for you to
> own, I don�t want it anymore�.


You may want to use rb_str_buf_new instead of malloc.


  /* allocate buffer whose size is s */
  VALUE str = rb_str_buf_new(s);

  /* 'library_call' writes to the buffer */
  library_call(RSTRING_PTR(str), &s);

  /* update the length of string */
  rb_str_resize(str, s);

  return str;


Be careful not to allow GC to occur within 'library_call'.
GC may shrink the buffer.

-- 
Yusuke Endoh <mame@tsg.ne.jp>