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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . C O M M A N D _ L I N E --
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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) 1992-2018, Free Software Foundation, Inc. --
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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 System; use System;
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33
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34 package body Ada.Command_Line is
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35
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36 function Arg_Count return Natural;
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37 pragma Import (C, Arg_Count, "__gnat_arg_count");
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38
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39 procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
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40 pragma Import (C, Fill_Arg, "__gnat_fill_arg");
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41
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42 function Len_Arg (Arg_Num : Integer) return Integer;
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43 pragma Import (C, Len_Arg, "__gnat_len_arg");
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44
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45 -----------------------
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46 -- Local Subprograms --
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47 -----------------------
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48
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49 function Initialized return Boolean;
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50 -- Checks to ensure that gnat_argc and gnat_argv have been properly
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51 -- initialized. Returns false if not, or if argv / argc are
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52 -- unsupported on the target (e.g. VxWorks).
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53
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54 --------------
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55 -- Argument --
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56 --------------
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57
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58 function Argument (Number : Positive) return String is
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59 begin
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60 if Number > Argument_Count then
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61 raise Constraint_Error;
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62 end if;
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63
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64 declare
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65 Num : constant Positive :=
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66 (if Remove_Args = null then Number else Remove_Args (Number));
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67 Arg : aliased String (1 .. Len_Arg (Num));
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68 begin
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69 Fill_Arg (Arg'Address, Num);
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70 return Arg;
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71 end;
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72 end Argument;
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73
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74 --------------------
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75 -- Argument_Count --
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76 --------------------
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77
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78 function Argument_Count return Natural is
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79 begin
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80 if not Initialized then
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81 -- RM A.15 (11)
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82 return 0;
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83 end if;
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84
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85 if Remove_Args = null then
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86 return Arg_Count - 1;
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87 else
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88 return Remove_Count;
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89 end if;
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90 end Argument_Count;
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91
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92 -----------------
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93 -- Initialized --
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94 -----------------
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95
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96 function Initialized return Boolean is
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97 gnat_argv : System.Address;
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98 pragma Import (C, gnat_argv, "gnat_argv");
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99
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100 begin
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101 return gnat_argv /= System.Null_Address;
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102 end Initialized;
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103
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104 ------------------
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105 -- Command_Name --
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106 ------------------
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107
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108 function Command_Name return String is
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109 begin
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110 if not Initialized then
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111 return "";
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112 end if;
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113
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114 declare
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115 Arg : aliased String (1 .. Len_Arg (0));
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116
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117 begin
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118 Fill_Arg (Arg'Address, 0);
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119 return Arg;
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120 end;
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121 end Command_Name;
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122
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123 end Ada.Command_Line;
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