BrainFuck解释器
无注释版本：
#include <stdio.h>
#include <stdlib.h>
#define SIZE 5000
char data[SIZE], code[SIZE];
int ptr, flag;
void interpreter(char *ip)
{
char* re;
while (*ip)
{
switch(*ip++)
{
case '<': --ptr; break;
case '>': ++ptr; break;
case '+': ++data[ptr]; break;
case '-': --data[ptr]; break;
case '.': putchar(data[ptr]); fflush(stdout); break;
case ',': data[ptr] = getchar(); fflush(stdout); break;
case '[': for (flag=1,re=ip; flag && *ip; ++ip)
flag += *ip=='[', flag -= *ip==']';
if(!flag)
{
ip[-1] = 0;
while (data[ptr])
interpreter(re);
ip[-1] = ']';
break;
}
case ']': puts("Unbalancded brackets!"), exit(-3);
default : ;//SKIP
}
if (ptr < 0 || ptr > 100)
puts("Out of Range"), exit(-4);
}
}
int main(int argc, char *argv[])
{
FILE *fin;
int codelength;
if (argc != 2)
return puts("BrainFuck Interpreter v 0.1\nStar\nUsage:BFI filename"), 0;
if ((fin = fopen(argv[1], "r")) == NULL)
return puts("Cannot open file!"), -1;
fseek(fin, 0, SEEK_END);
if ((codelength = ftell(fin)) > SIZE)
return puts("The program is too large."), -2;
fseek(fin, 0, SEEK_SET);
fread(code, codelength, 1, fin);
code[codelength] = '\0';
interpreter(code);
return 0;
}
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