# \[Bug:trunk\] confusion about treating filesystem encoding

**URL:** <https://www.ruby-forum.com/t/bug-trunk-confusion-about-treating-filesystem-encoding/140744>\
**Category:** Development\
**Created:** [June 18, 2008, 6:39am UTC](https://www.ruby-forum.com/t/bug-trunk-confusion-about-treating-filesystem-encoding/140744 "2008-06-18T06:39:22Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [June 18, 2008, 6:39am UTC](https://www.ruby-forum.com/t/bug-trunk-confusion-about-treating-filesystem-encoding/140744/1 "2008-06-18T06:39:22Z")

</div>

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# e$B$V$i2\<$2$I$3$m$,7h$a@Z$l$J$+$C$?e(B

e$B@hF|@.@%$5$s$,F~$l$F$/$@$5$C$?e(Bfilesystem  
encodinge$BBP1~$G$9$,!"e(B  
rb\_encoding_e$B$He(Bencoding indexe$B$r:.F1$7$F$$$^$9!#e(B  
rb\_encoding_e$B$NHf3S$,M-8z$J$N$+$I$&$+3N?.$,$J$+$C$?$N$G!"e(Bencoding  
indexe$B$GE}0l$7$F$\_$^$7$?!#e(B

# rb\_encoding\*e$B$NHf3S$,M-8z$J$i$=$C$A$KB7$($?J}$,%7%s%W%k$K$Je(B

# e$B$k$H$O;W$$$^$9!#e(B

rb\_utf8\_encindex()e$B$O$J$s$G$J$$$s$@$m$&e(B?

# Index: io.c

— io.c (revision 17396)  
+++ io.c (working copy)  
@@ -4107,16 +4107,16 @@ rb\_open\_file(int argc, VALUE \*argv, VALU  
static int fs\_encoding;  
int fname\_encoding = rb\_enc\_get\_index(fname);  
if (!fs\_encoding)

- 

```
 fs_encoding = rb_filesystem_encoding();

```

- if (rb\_usascii\_encoding() != fname\_encoding
- 

```
 && rb_ascii8bit_encoding() != fname_encoding

```

- 

```
 fs_encoding = rb_enc_to_index(rb_filesystem_encoding());

```

- if (rb\_usascii\_encindex() != fname\_encoding
- 

```
 && rb_ascii8bit_encindex() != fname_encoding

```

#if defined **APPLE**

- 

```
 && rb_utf8_encoding() != fname_encoding

```

- 

```
 && rb_enc_to_index(rb_utf8_encoding()) != fname_encoding

```

#endif  
&& fs\_encoding != fname\_encoding) {  
static VALUE fs\_enc;  
if (!fs\_enc)

- fs\_enc = rb\_enc\_from\_encoding(fs\_encoding);

- fs\_enc = rb\_enc\_from\_encoding(rb\_enc\_from\_index(fs\_encoding));  
fname = rb\_str\_transcode(fname, fs\_enc);  
}  
}

e$B$=$l$G$O!#e(B

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [June 18, 2008, 8:17am UTC](https://www.ruby-forum.com/t/bug-trunk-confusion-about-treating-filesystem-encoding/140744/2 "2008-06-18T08:17:47Z")

</div>

e$B%A%1%C%He(B #179 e$B$,99?7$5$l$^$7$?!#e(B (by Yui NARUSE)

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## Applied in changeset r17403.

[http://redmine.ruby-lang.org/issues/show/179](http://redmine.ruby-lang.org/issues/show/179)

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [June 18, 2008, 6:39pm UTC](https://www.ruby-forum.com/t/bug-trunk-confusion-about-treating-filesystem-encoding/140744/3 "2008-06-18T18:39:15Z")

</div>

e$B@.@%$G$9!#e(B

U.Nakamura wrote:

> rb\_utf8\_encindex()e$B$O$J$s$G$J$$$s$@$m$&e(B?

e$B$=$&$$$($P$3$NM}M3$G$9$,!"C1$K8=;~E@$Ge(B UTF-8 e$B$Ne(B index  
e$B$r07$&%3!\<%I$,e(B  
Ruby e$BK\BN$K$J$$$+$i$G$9!#e(B  
e$B5U$K$$$($P!“e(BUS-ASCII e$B$de(B ASCII-8BIT e$B$,$”$k$N$O!“e(B  
string.c e$B$H$+$G$=$&$$$&%3!\<%I$,$”$k$+$i!#e(B