mirror of https://gitlab.com/QEF/q-e.git
75 lines
2.3 KiB
Fortran
75 lines
2.3 KiB
Fortran
!
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! Copyright (C) 2002-2020 Quantum ESPRESSO 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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SUBROUTINE input_from_file( )
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!
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!! Check command-line arguments for -i[nput] "file name"
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!! if "file name" is present, attach input unit 5 to the specified file
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!! In parallel execution, must be called by a single processor
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!
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USE open_close_input_file, ONLY : get_file_name
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!
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IMPLICIT NONE
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!
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INTEGER :: stdin = 5, stderr = 6, ierr = 0
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CHARACTER(LEN = 256) :: input_file
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!
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input_file = get_file_name ( )
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!
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IF ( TRIM ( input_file ) /= ' ' ) THEN
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!
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OPEN ( UNIT = stdin, FILE = input_file, FORM = 'FORMATTED', &
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STATUS = 'OLD', IOSTAT = ierr )
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!
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! do not call "errore" here: it may hang in parallel execution
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! if this routine is called by a single processor
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!
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IF ( ierr > 0 ) WRITE (stderr, &
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'(" *** Fatal error: input file ",A," not found ***")' ) TRIM( input_file )
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!
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ELSE
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ierr = -1
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ENDIF
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!
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END SUBROUTINE input_from_file
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!----------------------------------------------------------------------------
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!
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SUBROUTINE get_file( input_file )
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!
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!! This subroutine reads, either from command line or from terminal,
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!! the name of a file to be opened. To be used for serial codes only.
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!! Expected syntax: "code [filename]" (one command-line option, or none)
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!
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USE open_close_input_file, ONLY : get_file_name
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!
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IMPLICIT NONE
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!
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CHARACTER (LEN=*),INTENT(OUT) :: input_file
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!! On output contains the path to the input file
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INTEGER :: stdin = 5, stdout = 6, stderr = 6
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LOGICAL :: exst
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!
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input_file = get_file_name ( )
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!
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IF ( TRIM ( input_file ) == ' ' ) THEN
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10 WRITE(stdout,'(5x,"Input file > ")', advance="NO")
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READ (stdin,'(a)', end = 20, err=20) input_file
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IF ( TRIM(input_file) == ' ') GO TO 10
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INQUIRE ( FILE = input_file, EXIST = exst )
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IF ( .NOT. exst ) THEN
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WRITE(stderr,'(A,": file not found")') TRIM(input_file)
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GO TO 10
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END IF
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END IF
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RETURN
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20 WRITE(stdout,'("Fatal error reading file name ",A)') TRIM(input_file)
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!
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END SUBROUTINE get_file
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