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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY COMPONENTS --
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4 -- --
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5 -- S Y S T E M . C O M P A R E _ A R R A Y _ U N S I G N E D _ 8 --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2002-2018, 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 functions for runtime comparisons on arrays whose
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33 -- elements are 8-bit discrete type values to be treated as unsigned.
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34
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35 pragma Compiler_Unit_Warning;
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36
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37 package System.Compare_Array_Unsigned_8 is
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38
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39 -- Note: although the functions in this package are in a sense Pure, the
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40 -- package cannot be declared as Pure, since the arguments are addresses,
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41 -- not the data, and the result is not pure wrt the address values.
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42
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43 function Compare_Array_U8
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44 (Left : System.Address;
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45 Right : System.Address;
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46 Left_Len : Natural;
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47 Right_Len : Natural) return Integer;
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48 -- Compare the array starting at address Left of length Left_Len with the
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49 -- array starting at address Right of length Right_Len. The comparison is
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50 -- in the normal Ada semantic sense of array comparison. The result is -1,
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51 -- 0, +1 for Left < Right, Left = Right, Left > Right respectively. This
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52 -- function works with 4 byte words if the operands are aligned on 4-byte
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53 -- boundaries and long enough.
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54
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55 function Compare_Array_U8_Unaligned
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56 (Left : System.Address;
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57 Right : System.Address;
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58 Left_Len : Natural;
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59 Right_Len : Natural) return Integer;
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60 -- Same functionality as Compare_Array_U8 but always proceeds by bytes.
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61 -- Used when the caller knows that the operands are unaligned, or short
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62 -- enough that it makes no sense to go by words.
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63
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64 end System.Compare_Array_Unsigned_8;
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