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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . V A L _ L L U --
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6 -- --
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7 -- S p e c --
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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 -- This package contains routines for scanning modular Long_Long_Unsigned
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33 -- values for use in Text_IO.Modular_IO, and the Value attribute.
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34
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35 with System.Unsigned_Types;
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36
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37 package System.Val_LLU is
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38 pragma Pure;
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39
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40 function Scan_Raw_Long_Long_Unsigned
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41 (Str : String;
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42 Ptr : not null access Integer;
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43 Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned;
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44 -- This function scans the string starting at Str (Ptr.all) for a valid
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45 -- integer according to the syntax described in (RM 3.5(43)). The substring
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46 -- scanned extends no further than Str (Max). Note: this does not scan
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47 -- leading or trailing blanks, nor leading sign.
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48 --
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49 -- There are three cases for the return:
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50 --
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51 -- If a valid integer is found, then Ptr.all is updated past the last
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52 -- character of the integer.
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53 --
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54 -- If no valid integer is found, then Ptr.all points either to an initial
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55 -- non-digit character, or to Max + 1 if the field is all spaces and the
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56 -- exception Constraint_Error is raised.
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57 --
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58 -- If a syntactically valid integer is scanned, but the value is out of
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59 -- range, or, in the based case, the base value is out of range or there
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60 -- is an out of range digit, then Ptr.all points past the integer, and
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61 -- Constraint_Error is raised.
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62 --
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63 -- Note: these rules correspond to the requirements for leaving the pointer
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64 -- positioned in Text_IO.Get. Note that the rules as stated in the RM would
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65 -- seem to imply that for a case like:
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66 --
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67 -- 8#12345670009#
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68 --
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69 -- the pointer should be left at the first # having scanned out the longest
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70 -- valid integer literal (8), but in fact in this case the pointer points
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71 -- past the final # and Constraint_Error is raised. This is the behavior
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72 -- expected for Text_IO and enforced by the ACATS tests.
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73 --
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74 -- If a based literal is malformed in that a character other than a valid
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75 -- hexadecimal digit is encountered during scanning out the digits after
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76 -- the # (this includes the case of using the wrong terminator, : instead
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77 -- of # or vice versa) there are two cases. If all the digits before the
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78 -- non-digit are in range of the base, as in
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79 --
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80 -- 8#100x00#
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81 -- 8#100:
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82 --
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83 -- then in this case, the "base" value before the initial # is returned as
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84 -- the result, and the pointer points to the initial # character on return.
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85 --
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86 -- If an out of range digit has been detected before the invalid character,
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87 -- as in:
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88 --
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89 -- 8#900x00#
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90 -- 8#900:
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91 --
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92 -- then the pointer is also left at the initial # character, but constraint
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93 -- error is raised reflecting the encounter of an out of range digit.
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94 --
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95 -- Finally if we have an unterminated fixed-point constant where the final
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96 -- # or : character is missing, Constraint_Error is raised and the pointer
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97 -- is left pointing past the last digit, as in:
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98 --
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99 -- 8#22
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100 --
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101 -- This string results in a Constraint_Error with the pointer pointing
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102 -- past the second 2.
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103 --
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104 -- Note: if Str is empty, i.e. if Max is less than Ptr, then this is a
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105 -- special case of an all-blank string, and Ptr is unchanged, and hence
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106 -- is greater than Max as required in this case.
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107 --
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108 -- Note: this routine should not be called with Str'Last = Positive'Last.
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109 -- If this occurs Program_Error is raised with a message noting that this
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110 -- case is not supported. Most such cases are eliminated by the caller.
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111
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112 function Scan_Long_Long_Unsigned
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113 (Str : String;
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114 Ptr : not null access Integer;
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115 Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned;
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116 -- Same as Scan_Raw_Long_Long_Unsigned, except scans optional leading
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117 -- blanks, and an optional leading plus sign.
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118 --
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119 -- Note: if a minus sign is present, Constraint_Error will be raised.
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120 -- Note: trailing blanks are not scanned.
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121
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122 function Value_Long_Long_Unsigned
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123 (Str : String) return System.Unsigned_Types.Long_Long_Unsigned;
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124 -- Used in computing X'Value (Str) where X is a modular integer type whose
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125 -- modulus exceeds the range of System.Unsigned_Types.Unsigned. Str is the
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126 -- string argument of the attribute. Constraint_Error is raised if the
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127 -- string is malformed, or if the value is out of range.
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128
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129 end System.Val_LLU;
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