system_isdir Function

public impure elemental function system_isdir(dirname)

NAME

system_isdir(3f) - [M_system:QUERY_FILE] checks if argument is a
                   directory path
(LICENSE:PD)

SYNOPSIS

elemental impure logical function system_isdir(pathname)

character(len=*),intent(in) :: pathname
logical                     :: system_isdir

DESCRIPTION

    The system_isdir(3f) function checks if path is a directory.

OPTIONS

    path   a character string representing a directory
           pathname. Trailing spaces are ignored.

RETURN VALUE

    The system_isdir() function should always be successful and no
    return value is reserved to indicate an error.

ERRORS

    No errors are defined.

SEE ALSO

system_islnk(3f), system_stat(3f), isreg(3f), system_perm(3f)

EXAMPLE

Sample program

program demo_system_isdir
use M_system, only : system_isdir
use M_system, only : access=>system_access, R_OK
use M_system, only : system_dir
implicit none
character(len=:),allocatable :: fnames(:)
integer                      :: i
character(len=80),parameter  :: names(*)=[ &
& '/tmp            ', &
& '/tmp/NOTTHERE   ', &
& '/usr/local      ', &
& '.               ', &
& 'PROBABLY_NOT    ']
   !
   do i=1,size(names)
      write(*,*)' is ',trim(names(i)),' a directory? ', &
      & system_isdir(names(i))
   enddo
   !
   ! EXTENDED EXAMPLE: list readable non-hidden directories in
   !                   current directory
   fnames=system_dir(pattern='*') ! list all files in current directory
   ! select readable directories
   fnames=pack(fnames,system_isdir(fnames).and.access(fnames,R_OK))
   fnames=pack(fnames,fnames(:)(1:1) .ne.'.') ! skip hidden directories
   do i=1,size(fnames)
      write(*,*)' ',trim(fnames(i)),' is a directory'
   enddo
   !
end program demo_system_isdir

Results:

  is /tmp a directory?  T
  is /tmp/NOTTHERE a directory?  F
  is /usr/local a directory?  T
  is . a directory?  T
  is PROBABLY_NOT a directory?  F

  TEST is a directory
  EXAMPLE is a directory

Arguments

Type IntentOptional Attributes Name
character(len=*), intent(in) :: dirname

Return Value logical


Contents

Source Code

system_isdir

Source Code

elemental impure function system_isdir(dirname)
implicit none

! ident_10="@(#) M_system system_isdir(3f) determine if DIRNAME is a directory name"

character(len=*),intent(in) :: dirname
logical                     :: system_isdir
character(kind=c_char,len=1),allocatable :: temp(:)

interface
  function c_isdir(dirname) bind (C,name="my_isdir") result (c_ierr)
  import c_char,c_int
  character(kind=c_char,len=1),intent(in) :: dirname(*)
  integer(kind=c_int)                     :: c_ierr
  end function c_isdir
end interface

   temp = str2_carr(trim(dirname)) ! kludge for bug in ifort (IFORT) 2021.3.0 20210609
   if(c_isdir(temp).eq.1)then
      system_isdir=.true.
   else
      system_isdir=.false.
   endif

end function system_isdir