Created
December 2, 2023 07:56
cpp brainfuck interpreter
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#include <fstream> | |
#include <iostream> | |
#include <iterator> | |
#include <vector> | |
int main(int argc, char **argv) | |
{ | |
std::fstream file(argv[1], std::ios::in); | |
std::istreambuf_iterator<char> fstart(file), fend; | |
std::vector<unsigned char> itape(fstart, fend); | |
file.close(); | |
std::vector<unsigned char> mtape(30000, 0); | |
std::vector<unsigned char>::iterator m = mtape.begin(); | |
std::vector<unsigned char>::iterator i = itape.begin(); | |
int b = 0; | |
for (; i != itape.end(); ++i) { | |
switch (*i) { | |
case '>': | |
if (++m == mtape.end()) { | |
mtape.push_back(0); | |
m = --mtape.end(); | |
} | |
break; | |
case '<': | |
--m; | |
break; | |
case '+': | |
++*m; | |
break; | |
case '-': | |
--*m; | |
break; | |
case '.': | |
std::cout << *m; | |
break; | |
case ',': | |
std::cin >> *m; | |
break; | |
case '[': | |
if (*m) | |
continue; | |
++b; | |
while (b) | |
switch (*++i) { | |
case '[': | |
++b; | |
break; | |
case ']': | |
--b; | |
break; | |
} | |
break; | |
case ']': | |
if (!*m) | |
continue; | |
++b; | |
while (b) | |
switch (*--i) { | |
case '[': | |
--b; | |
break; | |
case ']': | |
++b; | |
break; | |
} | |
--i; | |
break; | |
} | |
} | |
} |
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