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add proc to check if directory can be read #12960

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add proc to check if directory can be read #12960

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22 changes: 22 additions & 0 deletions lib/pure/os.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -1037,6 +1037,7 @@ proc existsDir*(dir: string): bool {.rtl, extern: "nos$1", tags: [ReadDirEffect]
## is returned. Follows symlinks.
##
## See also:
## * `checkDir proc <#checkDir,OSErrorCode>`_
## * `existsFile proc <#existsFile,string>`_
## * `symlinkExists proc <#symlinkExists,string>`_
when defined(windows):
Expand All @@ -1050,6 +1051,27 @@ proc existsDir*(dir: string): bool {.rtl, extern: "nos$1", tags: [ReadDirEffect]
var res: Stat
return stat(dir, res) >= 0'i32 and S_ISDIR(res.st_mode)

proc checkDir*(dir: string): OSErrorCode {.rtl, extern: "nos$1",
tags: [ReadDirEffect], noNimScript.} =
## Returns 0 if opening `dir` as a directory succeeds (`dir` exists and is a
## readable directory), otherwise returns the OS error code. Follows symlinks.
##
## See also:
## * `osErrorMsg proc <#osErrorMsg,OSErrorCode>`_
## * `existsDir proc <#existsDir,string>`_
## * `symlinkExists proc <#symlinkExists,string>`_
when defined(windows):
var f: WIN32_FIND_DATA
var h = findFirstFile(dir / "*", f)
defer: findClose(h)
if h == -1:
result = osLastError()
else:
var d = opendir(dir)
defer: discard closedir(d)
if d == nil:
result = osLastError()

proc symlinkExists*(link: string): bool {.rtl, extern: "nos$1",
tags: [ReadDirEffect],
noNimScript.} =
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