From: nobu.nakada@...
Date: 2002-03-18T15:51:08+09:00
Subject: [ruby-dev:16454] Re: ext/iconv does not work with iconv 2.0 (FreeBSD) (PR#273)

なかだです。

At Fri, 15 Mar 2002 23:55:03 +0900 (JST),
xm@xml-objects.com wrote:
> Full_Name: Aristarkh A Zagorodnikov
> Version: ruby 1.7.2 (2002-03-14) [i386-freebsd4.3]
> OS: FreeBSD 4.3-STABLE
> Submission from: (NULL) (80.80.104.3)
> 
> 
> ext/iconv does not work with iconv 2.0 (FreeBSD), while works correctly with
> iconv from GNU libc.
> It fails on conversion of strings, which are more than 1024 bytes.
> In this case, *inlen (in iconv_try()) is nonzero (iconv() returns when 1024th
> character is converted), and error is not set (errno == EZERO). It seems that
> this case should be interpreted as a E2BIG (i.e. process with next block).
> FYI: string was a synthetic one (1025 '.' characters), source and target
> encodings are 'iso-8859-1'.

FreeBSDのiconv 2.0で、'iso-8859-1'から'iso-8859-1'へのiconv()で1024バ
イトまでしか変換されないという報告があるんですが、これはFreeBSDのほう
ではなにか報告されてないでしょうか。

<ftp://ftp.freebsd.org/pub/FreeBSD/ports/distfiles/iconv-2.0.tar.gz>の
iconv-2.0/lib/converter.cを見ると、このnull_conv()が実際になにも変換さ
れないときの処理を行っているようなんですが、*outbytesleftが足りないと
きでも0を返してるだけなのがまずいような気がします。

| static size_t
| null_conv(void *data, const unsigned char **inbuf, size_t *inbytesleft,
|           unsigned char **outbuf, size_t *outbytesleft)
| {
| 	if (inbuf && *inbuf && inbytesleft && *inbytesleft > 0 && outbuf
| 			&& *outbuf && outbytesleft && *outbytesleft > 0) {
| 		size_t len = *inbytesleft < *outbytesleft ? *inbytesleft
| 							  : *outbytesleft;
| 		bcopy(*inbuf, *outbuf, len);
| 		*inbuf += len;
| 		*inbytesleft -= len;
| 		*outbuf += len;
| 		*outbytesleft -= len;
| 	}
| 	return 0;
| }

また、unicode_conv()でもerrnoを設定するだけで-1を返していないところが
あります。

-- 
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
    中田 伸悦