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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . T T Y --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2002-2018, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Interfaces.C.Strings; use Interfaces.C.Strings;
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33
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34 package body GNAT.TTY is
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35
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36 use System;
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37
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38 procedure Check_TTY (Handle : TTY_Handle);
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39 -- Check the validity of Handle. Raise Program_Error if ttys are not
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40 -- supported. Raise Constraint_Error if Handle is an invalid handle.
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41
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42 ------------------
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43 -- Allocate_TTY --
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44 ------------------
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45
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46 procedure Allocate_TTY (Handle : out TTY_Handle) is
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47 function Internal return System.Address;
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48 pragma Import (C, Internal, "__gnat_new_tty");
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49
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50 begin
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51 if not TTY_Supported then
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52 raise Program_Error;
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53 end if;
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54
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55 Handle.Handle := Internal;
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56 end Allocate_TTY;
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57
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58 ---------------
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59 -- Check_TTY --
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60 ---------------
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61
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62 procedure Check_TTY (Handle : TTY_Handle) is
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63 begin
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64 if not TTY_Supported then
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65 raise Program_Error;
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66 elsif Handle.Handle = System.Null_Address then
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67 raise Constraint_Error;
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68 end if;
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69 end Check_TTY;
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70
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71 ---------------
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72 -- Close_TTY --
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73 ---------------
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74
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75 procedure Close_TTY (Handle : in out TTY_Handle) is
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76 procedure Internal (Handle : System.Address);
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77 pragma Import (C, Internal, "__gnat_close_tty");
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78 begin
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79 Check_TTY (Handle);
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80 Internal (Handle.Handle);
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81 Handle.Handle := System.Null_Address;
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82 end Close_TTY;
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83
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84 ---------------
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85 -- Reset_TTY --
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86 ---------------
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87
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88 procedure Reset_TTY (Handle : TTY_Handle) is
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89 procedure Internal (Handle : System.Address);
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90 pragma Import (C, Internal, "__gnat_reset_tty");
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91 begin
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92 Check_TTY (Handle);
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93 Internal (Handle.Handle);
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94 end Reset_TTY;
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95
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96 --------------------
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97 -- TTY_Descriptor --
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98 --------------------
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99
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100 function TTY_Descriptor
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101 (Handle : TTY_Handle) return GNAT.OS_Lib.File_Descriptor
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102 is
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103 function Internal
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104 (Handle : System.Address) return GNAT.OS_Lib.File_Descriptor;
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105 pragma Import (C, Internal, "__gnat_tty_fd");
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106 begin
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107 Check_TTY (Handle);
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108 return Internal (Handle.Handle);
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109 end TTY_Descriptor;
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110
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111 --------------
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112 -- TTY_Name --
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113 --------------
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114
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115 function TTY_Name (Handle : TTY_Handle) return String is
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116 function Internal (Handle : System.Address) return chars_ptr;
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117 pragma Import (C, Internal, "__gnat_tty_name");
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118 begin
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119 Check_TTY (Handle);
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120 return Value (Internal (Handle.Handle));
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121 end TTY_Name;
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122
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123 -------------------
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124 -- TTY_Supported --
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125 -------------------
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126
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127 function TTY_Supported return Boolean is
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128 function Internal return Integer;
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129 pragma Import (C, Internal, "__gnat_tty_supported");
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130 begin
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131 return Internal /= 0;
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132 end TTY_Supported;
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133
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134 end GNAT.TTY;
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