mirror of https://gitlab.com/QEF/q-e.git
78 lines
2.4 KiB
Fortran
78 lines
2.4 KiB
Fortran
!
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! Copyright (C) 2001-2003 PWSCF group
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! This file is distributed under the terms of the
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! GNU General Public License. See the file `License'
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! in the root directory of the present distribution,
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! or http://www.gnu.org/copyleft/gpl.txt .
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!
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!
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!-----------------------------------------------------------------------
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subroutine diropn (unit, extension, recl, exst)
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!-----------------------------------------------------------------------
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!
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! this routine opens a file named "prefix"."extension" in tmp_dir
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! for direct I/O access
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! If appropriate, the node number is added to the file name
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!
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#if defined(__ALPHA)
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# define DIRECT_IO_FACTOR 2
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#else
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# define DIRECT_IO_FACTOR 8
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#endif
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!
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! the record length in direct-access I/O is given by the number of
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! real*8 words times DIRECT_IO_FACTOR (may depend on the compiler)
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!
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USE kinds
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use io_files, only: prefix, tmp_dir, nd_nmbr
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use mp_global, only: mpime
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implicit none
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!
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! first the input variables
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!
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character(len=*) :: extension
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! input: name of the file to open
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integer :: unit, recl
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! input: unit of the file to open
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! input: length of the records
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logical :: exst
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! output: if true the file exists
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!
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! local variables
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!
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character(len=256) :: tempfile, filename
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! complete file name
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integer :: ios, unf_recl
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! used to check I/O operations
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! length of the record
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logical :: opnd
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! if true the file is already opened
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!
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if (unit < 0) call errore ('diropn', 'wrong unit', 1)
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!
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! we first check that the file is not already openend
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!
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ios = 0
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inquire (unit = unit, opened = opnd)
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if (opnd) call errore ('diropn', "can't open a connected unit", abs(unit))
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!
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! then we check the filename extension
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!
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if (extension == ' ') call errore ('diropn','filename extension not given',2)
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filename = trim(prefix) // "." // trim(extension)
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tempfile = trim(tmp_dir) // trim(filename) //nd_nmbr
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inquire (file = tempfile, exist = exst)
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!
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! the unit for record length is unfortunately machine-dependent
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!
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unf_recl = DIRECT_IO_FACTOR * recl
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if (unf_recl <= 0) call errore ('diropn', 'wrong record length', 3)
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!
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open (unit, file = tempfile, iostat = ios, form = 'unformatted', &
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status = 'unknown', access = 'direct', recl = unf_recl)
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if (ios /= 0) call errore ('diropn', 'error opening '//filename, unit)
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return
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end subroutine diropn
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