65 lines
2.1 KiB
Fortran
65 lines
2.1 KiB
Fortran
! Copyright 2003, 2004, 2009 Free Software Foundation, Inc.
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! Contributed by Kejia Zhao <kejia_zh@yahoo.com.cn>
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!
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!This file is part of the GNU Fortran 95 runtime library (libgfortran).
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!
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!Libgfortran is free software; you can redistribute it and/or
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!modify it under the terms of the GNU General Public
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!License as published by the Free Software Foundation; either
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!version 3 of the License, or (at your option) any later version.
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!
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!Libgfortran is distributed in the hope that it will be useful,
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!but WITHOUT ANY WARRANTY; without even the implied warranty of
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!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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!GNU General Public License for more details.
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!
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!Under Section 7 of GPL version 3, you are granted additional
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!permissions described in the GCC Runtime Library Exception, version
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!3.1, as published by the Free Software Foundation.
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!
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!You should have received a copy of the GNU General Public License and
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!a copy of the GCC Runtime Library Exception along with this program;
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!see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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!<http://www.gnu.org/licenses/>.
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function _gfortran_selected_real_kind (p, r)
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implicit none
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integer, optional, intent (in) :: p, r
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integer :: _gfortran_selected_real_kind
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integer :: i, p2, r2
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logical :: found_p, found_r
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! Real kind_precision_range table
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type :: real_info
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integer :: kind
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integer :: precision
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integer :: range
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end type real_info
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include "selected_real_kind.inc"
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_gfortran_selected_real_kind = 0
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p2 = 0
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r2 = 0
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found_p = .false.
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found_r = .false.
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if (present (p)) p2 = p
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if (present (r)) r2 = r
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! Assumes each type has a greater precision and range than previous one.
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do i = 1, c
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if (p2 <= real_infos (i) % precision) found_p = .true.
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if (r2 <= real_infos (i) % range) found_r = .true.
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if (found_p .and. found_r) then
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_gfortran_selected_real_kind = real_infos (i) % kind
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return
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end if
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end do
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if (.not. (found_p)) _gfortran_selected_real_kind = _gfortran_selected_real_kind - 1
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if (.not. (found_r)) _gfortran_selected_real_kind = _gfortran_selected_real_kind - 2
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return
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end function
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