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Tiny Brainfuck interpreter
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#include <array> | |
#include <fstream> | |
#include <iostream> | |
using namespace std; | |
const size_t memory_size = 1024; | |
template <typename It> | |
It& skip(It&& it, char from, char to) { | |
while (*++it != to) if (*it == from) skip(it, from, to); | |
return it; | |
} | |
int main(int argc, char *argv[]) { | |
ifstream fs(argv[1]); | |
string program((istreambuf_iterator<char>(fs)), istreambuf_iterator<char>()); | |
auto ip = program.begin(); | |
array<char, memory_size> memory{ }; | |
auto data = memory.begin(); | |
while (ip != program.end()) { | |
switch (*ip++) { | |
case '>': data++; break; | |
case '<': data--; break; | |
case '+': (*data)++; break; | |
case '-': (*data)--; break; | |
case '.': cout << *data; break; | |
case ',': cin >> *data; break; | |
case '[': if (!*data) skip(ip, '[', ']'); break; | |
case ']': if (*data) ip = skip(reverse_iterator<string::iterator>(ip), ']', '[').base(); break; | |
} | |
} | |
} |
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Pass brainfuck source file as argument to the program:
bf <file>
.