1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
---|
2 | ! |
---|
3 | ! This module is a dynamic I/O unit manager. It keeps track of |
---|
4 | ! which units are in use and reserves units for stdin, stdout, and |
---|
5 | ! stderr. |
---|
6 | ! |
---|
7 | !----------------------------------------------------------------------- |
---|
8 | ! |
---|
9 | ! CVS:$Id: iounits.f,v 1.2 2000/04/19 21:56:25 pwjones Exp $ |
---|
10 | ! |
---|
11 | ! Copyright (c) 1997, 1998 the Regents of the University of |
---|
12 | ! California. |
---|
13 | ! |
---|
14 | ! This software and ancillary information (herein called software) |
---|
15 | ! called SCRIP is made available under the terms described here. |
---|
16 | ! The software has been approved for release with associated |
---|
17 | ! LA-CC Number 98-45. |
---|
18 | ! |
---|
19 | ! Unless otherwise indicated, this software has been authored |
---|
20 | ! by an employee or employees of the University of California, |
---|
21 | ! operator of the Los Alamos National Laboratory under Contract |
---|
22 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
---|
23 | ! Government has rights to use, reproduce, and distribute this |
---|
24 | ! software. The public may copy and use this software without |
---|
25 | ! charge, provided that this Notice and any statement of authorship |
---|
26 | ! are reproduced on all copies. Neither the Government nor the |
---|
27 | ! University makes any warranty, express or implied, or assumes |
---|
28 | ! any liability or responsibility for the use of this software. |
---|
29 | ! |
---|
30 | ! If software is modified to produce derivative works, such modified |
---|
31 | ! software should be clearly marked, so as not to confuse it with |
---|
32 | ! the version available from Los Alamos National Laboratory. |
---|
33 | ! |
---|
34 | !*********************************************************************** |
---|
35 | |
---|
36 | module iounits |
---|
37 | |
---|
38 | !----------------------------------------------------------------------- |
---|
39 | |
---|
40 | use kinds_mod ! defines data types |
---|
41 | |
---|
42 | implicit none |
---|
43 | |
---|
44 | !----------------------------------------------------------------------- |
---|
45 | |
---|
46 | logical (kind=log_kind), dimension(99), save :: |
---|
47 | & unit_free ! flags to determine whether unit is free for use |
---|
48 | |
---|
49 | integer (kind=int_kind), parameter :: |
---|
50 | & stdin = 5, ! reserves unit for standard input |
---|
51 | & stdout = 6, ! reserves unit for standard output |
---|
52 | & stderr = 6 ! reserves unit for standard error |
---|
53 | |
---|
54 | !*********************************************************************** |
---|
55 | |
---|
56 | contains |
---|
57 | |
---|
58 | !*********************************************************************** |
---|
59 | |
---|
60 | subroutine get_unit(iunit) |
---|
61 | |
---|
62 | !----------------------------------------------------------------------- |
---|
63 | ! |
---|
64 | ! This routine returns the next available I/O unit number. |
---|
65 | ! |
---|
66 | !----------------------------------------------------------------------- |
---|
67 | |
---|
68 | !----------------------------------------------------------------------- |
---|
69 | ! |
---|
70 | ! output variables |
---|
71 | ! |
---|
72 | !----------------------------------------------------------------------- |
---|
73 | |
---|
74 | integer (kind=int_kind), intent(out) :: |
---|
75 | & iunit ! next free I/O unit |
---|
76 | |
---|
77 | !----------------------------------------------------------------------- |
---|
78 | ! |
---|
79 | ! local variables |
---|
80 | ! |
---|
81 | !----------------------------------------------------------------------- |
---|
82 | |
---|
83 | integer (kind=int_kind) :: n |
---|
84 | |
---|
85 | logical (kind=log_kind), save :: first_call = .true. |
---|
86 | |
---|
87 | !----------------------------------------------------------------------- |
---|
88 | ! |
---|
89 | ! if this is the first call, reserve stdout, stdin and stderr |
---|
90 | ! |
---|
91 | !----------------------------------------------------------------------- |
---|
92 | |
---|
93 | if (first_call) then |
---|
94 | unit_free = .true. |
---|
95 | unit_free(stdin) = .false. |
---|
96 | unit_free(stdout) = .false. |
---|
97 | unit_free(stderr) = .false. |
---|
98 | first_call = .false. |
---|
99 | endif |
---|
100 | |
---|
101 | !----------------------------------------------------------------------- |
---|
102 | ! |
---|
103 | ! search for next available unit |
---|
104 | ! |
---|
105 | !----------------------------------------------------------------------- |
---|
106 | |
---|
107 | srch_unit: do n=1,99 |
---|
108 | if (unit_free(n)) then |
---|
109 | iunit = n |
---|
110 | unit_free(n) = .false. |
---|
111 | exit srch_unit |
---|
112 | endif |
---|
113 | end do srch_unit |
---|
114 | |
---|
115 | !----------------------------------------------------------------------- |
---|
116 | |
---|
117 | end subroutine get_unit |
---|
118 | |
---|
119 | !*********************************************************************** |
---|
120 | |
---|
121 | subroutine release_unit(iunit) |
---|
122 | |
---|
123 | !----------------------------------------------------------------------- |
---|
124 | ! |
---|
125 | ! This routine releases the specified unit and closes the file. |
---|
126 | ! |
---|
127 | !----------------------------------------------------------------------- |
---|
128 | !----------------------------------------------------------------------- |
---|
129 | ! |
---|
130 | ! input variables |
---|
131 | ! |
---|
132 | !----------------------------------------------------------------------- |
---|
133 | |
---|
134 | integer (kind=int_kind), intent(in) :: |
---|
135 | & iunit ! I/O unit to release |
---|
136 | |
---|
137 | !----------------------------------------------------------------------- |
---|
138 | ! |
---|
139 | ! closes I/O unit and declares it free |
---|
140 | ! |
---|
141 | !----------------------------------------------------------------------- |
---|
142 | |
---|
143 | unit_free(iunit) = .true. |
---|
144 | close(iunit) |
---|
145 | |
---|
146 | !----------------------------------------------------------------------- |
---|
147 | |
---|
148 | end subroutine release_unit |
---|
149 | |
---|
150 | !*********************************************************************** |
---|
151 | |
---|
152 | end module iounits |
---|
153 | |
---|
154 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
---|