runtime.cpp

#include <cstdio>
#include <cstdlib>

extern "C" {
 char *code(void *context, char *mem);
 void bf_putchar(void *context, int c);
 int bf_getchar(void *context);
}

void bf_putchar(void *context, int c) {
 putchar(c);
}

int bf_getchar(void *context) {
 int c = getchar();
 if (c == -1) return 0;
 return c;
}

int main(int argc, char **argv) {
 auto mem = static_cast<char*>(calloc(4096, 1));
 code(nullptr, mem);
 free(mem);
}