# Errors that StringIO#seek raises

**URL:** <https://www.ruby-forum.com/t/errors-that-stringio-seek-raises/92001>\
**Category:** Development\
**Created:** [April 14, 2007, 7:01am UTC](https://www.ruby-forum.com/t/errors-that-stringio-seek-raises/92001 "2007-04-14T07:01:54Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![sheepman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d07c76/32.png) [@sheepman](https://www.ruby-forum.com/u/sheepman)\
**Post date:** [April 14, 2007, 7:01am UTC](https://www.ruby-forum.com/t/errors-that-stringio-seek-raises/92001/1 "2007-04-14T07:01:54Z")

</div>

e$B$3$s$K$A$Oe(B sheepman e$B$G$9!#e(B

e$B%j%U%!%l%s%9$r=q$$$F$$$F5$$,$D$$$?:Y$+$$OC$G$9$,!#e(B

StringIO#seek e$B$,Ej$2$kNc30$r!"e(BIO  
e$B%/%i%9$N$=$l$K9g$o$;$k%Q%C%A$G$9!#e(B

- e$B\<+?H$,e(B close e$B$5$l$F$$$?$i!"e(BIOError  
e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B
- whence e$B$NCM$,@5$7$/$J$$\>l9g$O!"e(BErrno::EINVAL  
e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B

# $ svn diff Index: stringio.c

— stringio.c (revision 12131)  
+++ stringio.c (working copy)  
@@ -643,6 +643,9 @@  
struct StringIO \*ptr = StringIO(self);  
long offset;

- if (CLOSED(ptr)) {
- 

```
  rb_raise(rb_eIOError, "closed stream");

```

- }  
rb\_scan\_args(argc, argv, “11”, NULL, &whence);  
offset = NUM2LONG(argv[0]);  
switch (NIL\_P(whence) ? 0 : NUM2LONG(whence)) {  
@@ -655,7 +658,7 @@  
offset += RSTRING(ptr-\>string)-\>len;  
break;  
default:

- 

```
  rb_raise(rb_eArgError, "invalid whence %ld", NUM2LONG(whence));

```

- 

```
  error_inval("invalid whence");

```

}  
if (offset \< 0) {  
error\_inval(0);

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

---

<div class="post-metadata">

**Author:** ![sheepman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d07c76/32.png) [@sheepman](https://www.ruby-forum.com/u/sheepman)\
**Post date:** [April 14, 2007, 5:07pm UTC](https://www.ruby-forum.com/t/errors-that-stringio-seek-raises/92001/2 "2007-04-14T17:07:34Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:30710] errors that StringIO#seek raises”  
on Sat, 14 Apr 2007 14:01:13 +0900, sheepman  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|StringIO#seek e$B$,Ej$2$kNc30$r!"e(BIO e$B%/%i%9$N$=$l$K9g$o$;$k%Q%C%A$G$9!#e(B  
|  
|\* e$B\<+?H$,e(B close e$B$5$l$F$$$?$i!"e(BIOError e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B  
|\* whence e$B$NCM$,@5$7$/$J$$\>l9g$O!"e(BErrno::EINVAL e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B

e$B%3%\_%C%H$7$F$b$$$$$s$8$c$J$$$G$7$g$&$+!#e(B  
e$B$I$&$G$7$g$&!)e(B e$B!de(B e$B$J$+$@$5$se(B

---

<div class="post-metadata">

**Author:** ![sheepman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d07c76/32.png) [@sheepman](https://www.ruby-forum.com/u/sheepman)\
**Post date:** [April 14, 2007, 5:43pm UTC](https://www.ruby-forum.com/t/errors-that-stringio-seek-raises/92001/3 "2007-04-14T17:43:36Z")

</div>

e$B$J$+$@$G$9!#e(B

At Sat, 14 Apr 2007 14:01:13 +0900,  
sheepman wrote in [ruby-dev:30710]:

> StringIO#seek e$B$,Ej$2$kNc30$r!"e(BIO e$B%/%i%9$N$=$l$K9g$o$;$k%Q%C%A$G$9!#e(B

e$B$"$j$,$H$&$4$6$$$^$9!#$=$3$^$G%A%’%C%/$7$F$b$i$($k$H$O!#e(B

> - e$B\<+?H$,e(B close e$B$5$l$F$$$?$i!"e(BIOError e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B
> - whence e$B$NCM$,@5$7$/$J$$\>l9g$O!"e(BErrno::EINVAL e$B$rEj$2$k$h$&$K$7$^$7$?!#e(B

IOe$B$G$Oe(Bwhencee$B$+$I$&$+$b=P$^$;$s$M!#e(BStringIO#truncatee$B$KIi$ND9$5$re(B  
e$B;XDj$7$?$H$-$K$b!“e(BIO#truncatee$B$H$O%a%C%;!\<%8$,0c$$$^$9$,!”$3$N$Xe(B  
e$B$s$O$I$&$7$^$7$g$&$+$M$’!#e(B