R Under development (unstable) (2023-09-11 r85126 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> check <- function (path, dirname, basename)
+ {
+     stopifnot(
+         identical(dirname2(path), dirname),
+         identical(basename2(path), basename)
+     )
+ }
> 
> 
> dirname2  <- this.path:::.windows.dirname2
> basename2 <- this.path:::.windows.basename2
> 
> 
> check("", "", "")
> 
> 
> check("d:", "d:.", "")
> check("//host/share", "//host/share", "")
> 
> 
> check("d:/", "d:/", "")
> check("//host/share/", "//host/share/", "")
> check("/", "/", "")
> 
> 
> check("d:/path", "d:/", "path")
> check("//host/share/path", "//host/share/", "path")
> check("/path", "/", "path")
> 
> 
> check("d:file", "d:.", "file")
> check("file", ".", "file")
> check("d:path/to/file", "d:path/to", "file")
> 
> 
> check("d:/path/to/file", "d:/path/to", "file")
> check("//host/share/path/to/file", "//host/share/path/to", "file")
> check("/path/to/file", "/path/to", "file")
> check("/path/to/file/", "/path/to", "file")
> 
> 
> check(
+     this.path::path.join("/", "p1", "p2", "p3", c("file1", "file2")),
+     rep("/p1/p2/p3", 2),
+     c("file1", "file2")
+ )
> check(
+     this.path::path.join("/", "p1", "p2", "p3", "filename"),
+     "/p1/p2/p3",
+     "filename"
+ )
> 
> 
> check(
+     c("/usr/lib", "/usr/", "usr", "/", ".", ".."),
+     c("/usr"    , "/"    , "."  , "/", ".", "."),
+     c("lib"     , "usr"  , "usr", "" , ".", "..")
+ )
> 
> 
> dirname2  <- this.path:::.unix.dirname2
> basename2 <- this.path:::.unix.basename2
> 
> 
> check("", "", "")
> 
> 
> check("//host/share", "//host/share", "")
> 
> 
> check("//host/share/", "//host/share/", "")
> check("/", "/", "")
> 
> 
> check("//host/share/path", "//host/share/", "path")
> check("/path", "/", "path")
> 
> 
> check("file", ".", "file")
> 
> 
> check("//host/share/path/to/file", "//host/share/path/to", "file")
> check("/path/to/file", "/path/to", "file")
> check("/path/to/file/", "/path/to", "file")
> 
> 
> check(
+     this.path::path.join("/", "p1", "p2", "p3", c("file1", "file2")),
+     rep("/p1/p2/p3", 2),
+     c("file1", "file2")
+ )
> check(
+     this.path::path.join("/", "p1", "p2", "p3", "filename"),
+     "/p1/p2/p3",
+     "filename"
+ )
> 
> 
> check(
+     c("/usr/lib", "/usr/", "usr", "/", ".", ".."),
+     c("/usr"    , "/"    , "."  , "/", ".", "."),
+     c("lib"     , "usr"  , "usr", "" , ".", "..")
+ )
> 
> proc.time()
   user  system elapsed 
   0.12    0.06    0.17