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Brainfuck.cpp
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Brainfuck.cpp
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/*
*
* MIT License
*
* Copyright (c) 2018 BfBf
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <cstdint>
#include <cstdio>
enum Op {
ADD = 1,
INPUT = 2,
SUB = 3,
OUTPUT = 4,
LEFT = 5,
RIGHT = 6,
BEGIN = 7,
END = 8,
};
std::uint8_t memory[65536];
int main() {
std::uint16_t codePointer = 0, dataPointer = 0;
for(char c; (c = std::getchar()) != EOF; ) {
switch(c) {
case '+': memory[dataPointer++] = ADD; break;
case ',': memory[dataPointer++] = INPUT; break;
case '-': memory[dataPointer++] = SUB; break;
case '.': memory[dataPointer++] = OUTPUT; break;
case '<': memory[dataPointer++] = LEFT; break;
case '>': memory[dataPointer++] = RIGHT; break;
case '[': memory[dataPointer++] = BEGIN; break;
case ']': memory[dataPointer++] = END; break;
}
}
memory[dataPointer++] = 0;
for(std::uint8_t code; (code = memory[codePointer]); ++codePointer) {
switch(code) {
// +
case ADD: ++memory[dataPointer]; break;
// ,
case INPUT: { char c = std::getchar(); memory[dataPointer] = c == EOF ? 0 : c; break; }
// -
case SUB: --memory[dataPointer]; break;
// .
case OUTPUT: std::putchar(memory[dataPointer]); break;
// <
case LEFT: --dataPointer; break;
// >
case RIGHT: ++dataPointer; break;
// [
case BEGIN: {
if(!memory[dataPointer]) {
std::uint16_t level = 1;
while(level) {
++codePointer;
code = memory[codePointer];
if(code == 7) ++level;
else if(code == 8) --level;
}
}
break;
}
// ]
case END: {
if(memory[dataPointer]) {
std::uint16_t level = 1;
while(level) {
--codePointer;
code = memory[codePointer];
if(code == 7) --level;
else if(code == 8) ++level;
}
}
break;
}
}
}
return 0;
}