[2352] | 1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 2 | ! |
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| 3 | ! This module is a dynamic I/O unit manager. It keeps track of |
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| 4 | ! which units are in use and reserves units for stdin, stdout, and |
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| 5 | ! stderr. |
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| 6 | ! |
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| 7 | !----------------------------------------------------------------------- |
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| 8 | ! |
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[9499] | 9 | ! CVS:$Id$ |
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[2352] | 10 | ! |
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| 11 | ! Copyright (c) 1997, 1998 the Regents of the University of |
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| 12 | ! California. |
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| 13 | ! |
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| 14 | ! This software and ancillary information (herein called software) |
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| 15 | ! called SCRIP is made available under the terms described here. |
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| 16 | ! The software has been approved for release with associated |
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| 17 | ! LA-CC Number 98-45. |
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| 18 | ! |
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| 19 | ! Unless otherwise indicated, this software has been authored |
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| 20 | ! by an employee or employees of the University of California, |
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| 21 | ! operator of the Los Alamos National Laboratory under Contract |
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| 22 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
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| 23 | ! Government has rights to use, reproduce, and distribute this |
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| 24 | ! software. The public may copy and use this software without |
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| 25 | ! charge, provided that this Notice and any statement of authorship |
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| 26 | ! are reproduced on all copies. Neither the Government nor the |
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| 27 | ! University makes any warranty, express or implied, or assumes |
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| 28 | ! any liability or responsibility for the use of this software. |
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| 29 | ! |
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| 30 | ! If software is modified to produce derivative works, such modified |
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| 31 | ! software should be clearly marked, so as not to confuse it with |
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| 32 | ! the version available from Los Alamos National Laboratory. |
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| 33 | ! |
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| 34 | !*********************************************************************** |
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| 35 | |
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| 36 | module iounits |
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| 37 | |
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| 38 | !----------------------------------------------------------------------- |
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| 39 | |
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| 40 | use kinds_mod ! defines data types |
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| 41 | |
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| 42 | implicit none |
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| 43 | |
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| 44 | !----------------------------------------------------------------------- |
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| 45 | |
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| 46 | logical (kind=log_kind), dimension(99), save :: & |
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| 47 | unit_free ! flags to determine whether unit is free for use |
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| 48 | |
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| 49 | integer (kind=int_kind), parameter :: & |
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| 50 | stdin = 5, & ! reserves unit for standard input |
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| 51 | stdout = 6, & ! reserves unit for standard output |
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| 52 | stderr = 6 ! reserves unit for standard error |
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| 53 | |
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| 54 | !*********************************************************************** |
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| 55 | |
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| 56 | contains |
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| 57 | |
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| 58 | !*********************************************************************** |
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| 59 | |
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| 60 | subroutine get_unit(iunit) |
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| 61 | |
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| 62 | !----------------------------------------------------------------------- |
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| 63 | ! |
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| 64 | ! This routine returns the next available I/O unit number. |
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| 65 | ! |
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| 66 | !----------------------------------------------------------------------- |
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| 67 | |
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| 68 | !----------------------------------------------------------------------- |
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| 69 | ! |
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| 70 | ! output variables |
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| 71 | ! |
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| 72 | !----------------------------------------------------------------------- |
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| 73 | |
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| 74 | integer (kind=int_kind), intent(out) :: & |
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| 75 | iunit ! next free I/O unit |
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| 76 | |
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| 77 | !----------------------------------------------------------------------- |
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| 78 | ! |
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| 79 | ! local variables |
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| 80 | ! |
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| 81 | !----------------------------------------------------------------------- |
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| 82 | |
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| 83 | integer (kind=int_kind) :: n |
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| 84 | |
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| 85 | logical (kind=log_kind), save :: first_call = .true. |
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| 86 | |
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| 87 | !----------------------------------------------------------------------- |
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| 88 | ! |
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| 89 | ! if this is the first call, reserve stdout, stdin and stderr |
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| 90 | ! |
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| 91 | !----------------------------------------------------------------------- |
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| 92 | |
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| 93 | if (first_call) then |
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| 94 | unit_free = .true. |
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| 95 | unit_free(stdin) = .false. |
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| 96 | unit_free(stdout) = .false. |
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| 97 | unit_free(stderr) = .false. |
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| 98 | first_call = .false. |
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| 99 | endif |
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| 100 | |
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| 101 | !----------------------------------------------------------------------- |
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| 102 | ! |
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| 103 | ! search for next available unit |
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| 104 | ! |
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| 105 | !----------------------------------------------------------------------- |
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| 106 | |
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| 107 | srch_unit: do n=1,99 |
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| 108 | if (unit_free(n)) then |
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| 109 | iunit = n |
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| 110 | unit_free(n) = .false. |
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| 111 | exit srch_unit |
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| 112 | endif |
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| 113 | end do srch_unit |
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| 114 | |
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| 115 | !----------------------------------------------------------------------- |
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| 116 | |
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| 117 | end subroutine get_unit |
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| 118 | |
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| 119 | !*********************************************************************** |
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| 120 | |
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| 121 | subroutine release_unit(iunit) |
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| 122 | |
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| 123 | !----------------------------------------------------------------------- |
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| 124 | ! |
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| 125 | ! This routine releases the specified unit and closes the file. |
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| 126 | ! |
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| 127 | !----------------------------------------------------------------------- |
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| 128 | !----------------------------------------------------------------------- |
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| 129 | ! |
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| 130 | ! input variables |
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| 131 | ! |
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| 132 | !----------------------------------------------------------------------- |
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| 133 | |
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| 134 | integer (kind=int_kind), intent(in) :: & |
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| 135 | iunit ! I/O unit to release |
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| 136 | |
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| 137 | !----------------------------------------------------------------------- |
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| 138 | ! |
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| 139 | ! closes I/O unit and declares it free |
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| 140 | ! |
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| 141 | !----------------------------------------------------------------------- |
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| 142 | |
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| 143 | unit_free(iunit) = .true. |
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| 144 | close(iunit) |
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| 145 | |
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| 146 | !----------------------------------------------------------------------- |
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| 147 | |
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| 148 | end subroutine release_unit |
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| 149 | |
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| 150 | !*********************************************************************** |
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| 151 | |
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| 152 | end module iounits |
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| 153 | |
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| 154 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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