[Issue 17490] New: std.path.buildPath on Windows returns incorrect paths

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17490

          Issue ID: 17490
           Summary: std.path.buildPath on Windows returns incorrect paths
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: dlang at ryanjframe.com

std.path.buildPath should convert its input to the correct path representation
(e.g., replace slashes with backslashes).

Most of the time, Windows can use the forward slash, but Phobos should always
return paths with backslashes because:
- a couple of weird things can happen with some API functions [0].
- backslashes are required for extended-length paths (prepended with "\\?\")
[1].
- consistency; if I'm going to print a path to the user, it needs to be what
they'll expect, and I shouldn't have to modify what the standard library
returns.

Note that Windows does call "\foo" an absolute path (it implicitly prepends the
current drive).

> writeln(buildPath("c:\\asdf", "/bcd")); // "c:/bcd"; want "c:\bcd"
> writeln(buildPath("c:\\asdf/", "bcd")); // "c:\asdf/bcd"; want "c:\asdf\bcd"
> writeln(buildPath("c:/asdf", "d:/bcd")); // "d:/bcd"; want "d:\bcd"



[0] LoadLibrary:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms684175(v=vs.85).aspx?f=255&MSPPError=-2147217396
"When specifying a path, be sure to use backslashes (\), not forward slashes
(/)."

[1]
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#paths

--