os: Create file issue in windows when filename contains ":"(colon)

[defia]

What does 'go version' print?
go1.3.3 windows/386

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

1.in windows
2.f,err:=os.Create("a:b.txt")
3.f.Write([]byte("123"))

What happened?
a new file named "a" created
but has no content
that's because windows do not support filename that contains ":"
also there's no error occured (err==nil)

What should have happened instead?
os.Create() should returns a error


Please provide any additional information below.

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-go1.5, os-windows.

[alexbrainman]

Comment 2:

I cannot reproduce your problem:
C:\go\path\src\issue8935>dir a:
The system cannot find the path specified.
C:\go\path\src\issue8935>go version
go version devel +f8a253b426f1 Thu Oct 16 09:13:50 2014 +1100 windows/386
C:\go\path\src\issue8935>type main.go
package main
import (
        "fmt"
        "log"
        "os"
)
func main() {
        f, err := os.Create("a:b.txt")
        if err != nil {
                log.Fatal(err)
        }
        defer f.Close()
        fmt.Printf("Hello\n")
}
C:\go\path\src\issue8935>go run main.go
2014/10/16 10:31:10 open a:b.txt: The system cannot find the path specified.
exit status 1
Please, provide more details for me to reproduce your problem THank you.
Alex

Status changed to WaitingForReply.

[defia]

Comment 3:

my mistake
it should be:
os.Create("ab:c")
to reproduce the issue
the length of characters before colon should be at least 2

[alexbrainman]

Comment 4:

We use CreateFile Windows API to create files. And that is what happens when you request
to create file named ab:c. The API succeeds, and you get ab file created in your current
directory:
C:\go\path\src\issue8935>dir ab
 Volume in drive C has no label.
 Volume Serial Number is XXXX-XXXX
 Directory of C:\go\path\src\issue8935
File Not Found
C:\go\path\src\issue8935>go version
go version devel +f8a253b426f1 Thu Oct 16 09:13:50 2014 +1100 windows/386
C:\go\path\src\issue8935>type main.go
package main
import (
        "fmt"
        "log"
        "os"
)
func main() {
        f, err := os.Create("ab:c")
        if err != nil {
                log.Fatal(err)
        }
        defer f.Close()
        fmt.Printf("Hello\n")
}
C:\go\path\src\issue8935>go run main.go
Hello
C:\go\path\src\issue8935>dir ab
 Volume in drive C has no label.
 Volume Serial Number is XXXX-XXXX
 Directory of C:\go\path\src\issue8935
16/10/2014  04:11 PM                 0 ab
               1 File(s)              0 bytes
               0 Dir(s)  116,078,178,304 bytes free
While I agree with you (I would expect the API to fail in this instance), I don't see
another alternative, but to go with CreateFile behaviour.
Perhaps you have better argument, but I am closing this issue for now.
Alex

Status changed to WorkingAsIntended.