Kieron Morris
64b3c9a7ba
Added the apache license to all source files, accounting for authors. Also added a license.md containing the apache license + contributors.md listing all contributors.
60 lines
1.3 KiB
ObjectPascal
60 lines
1.3 KiB
ObjectPascal
// Copyright 2021 Kieron Morris
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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{
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Include->Rand - Utilities for creating pseudo-random numbers.
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@author(Kieron Morris <kjm@kieronmorris.me>)
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}
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unit rand;
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interface
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function rand32 : uint32;
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function rand16 : uint16;
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function rand8 : uint8;
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procedure srand(seed : uint32);
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implementation
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var
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next : uint32 = 1;
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function rand : uint32;
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begin
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next:= next * 1103515245 + 12345;
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rand:= (next div 65536) mod 32768;
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end;
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function rand32 : uint32;
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begin
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rand32:= (rand SHL 16) OR rand;
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end;
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function rand16 : uint16;
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begin
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rand16:= rand32 AND $FFFF;
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end;
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function rand8 : uint8;
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begin
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rand8:= rand32 AND $FF;
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end;
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procedure srand(seed : uint32);
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begin
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next:= next + seed;
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end;
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end. |