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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 -- I N T E R F A C E S . C _ S T R E A M S --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1996-2019, 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 Ada.Unchecked_Conversion;
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33
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34 package body Interfaces.C_Streams is
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35
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36 use type System.CRTL.size_t;
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37
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38 ----------------------------
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39 -- Interfaced C functions --
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40 ----------------------------
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41
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42 function C_fread
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43 (buffer : voids;
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44 size : size_t;
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45 count : size_t;
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46 stream : FILEs) return size_t;
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47 pragma Import (C, C_fread, "fread");
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48
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49 function C_fwrite
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50 (buffer : voids;
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51 size : size_t;
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52 count : size_t;
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53 stream : FILEs) return size_t;
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54 pragma Import (C, C_fwrite, "fwrite");
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55
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56 function C_setvbuf
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57 (stream : FILEs;
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58 buffer : chars;
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59 mode : int;
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60 size : size_t) return int;
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61 pragma Import (C, C_setvbuf, "setvbuf");
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62
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63 ------------
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64 -- fread --
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65 ------------
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66
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67 function fread
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68 (buffer : voids;
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69 size : size_t;
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70 count : size_t;
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71 stream : FILEs) return size_t
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72 is
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73 begin
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74 return C_fread (buffer, size, count, stream);
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75 end fread;
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76
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77 ------------
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78 -- fread --
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79 ------------
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80
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81 -- The following declarations should really be nested within fread, but
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82 -- limitations in front end inlining make this undesirable right now ???
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83
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84 type Byte_Buffer is array (0 .. size_t'Last / 2 - 1) of Unsigned_8;
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85 -- This should really be 0 .. size_t'last, but there is a problem
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86 -- in gigi in handling such types (introduced in GCC 3 Sep 2001)
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87 -- since the size in bytes of this array overflows ???
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88
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89 type Acc_Bytes is access all Byte_Buffer;
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90
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91 function To_Acc_Bytes is new Ada.Unchecked_Conversion (voids, Acc_Bytes);
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92
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93 function fread
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94 (buffer : voids;
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95 index : size_t;
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96 size : size_t;
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97 count : size_t;
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98 stream : FILEs) return size_t
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99 is
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100 begin
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101 return C_fread
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102 (To_Acc_Bytes (buffer) (index * size)'Address, size, count, stream);
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103 end fread;
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104
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105 ------------
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106 -- fwrite --
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107 ------------
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108
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109 function fwrite
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110 (buffer : voids;
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111 size : size_t;
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112 count : size_t;
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113 stream : FILEs) return size_t
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114 is
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115 begin
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116 return C_fwrite (buffer, size, count, stream);
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117 end fwrite;
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118
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119 -------------
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120 -- setvbuf --
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121 -------------
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122
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123 function setvbuf
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124 (stream : FILEs;
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125 buffer : chars;
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126 mode : int;
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127 size : size_t) return int
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128 is
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129 begin
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130 return C_setvbuf (stream, buffer, mode, size);
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131 end setvbuf;
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132
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133 end Interfaces.C_Streams;
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