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brainfuck-interpreter's Issues

Hello world fails

This should print "Hello World!" and a newline.

+[>[<->+[>+++>[+++++++++++>][]-[<]>
-]]++++++++++<]>>>>>>----.<<+++.<-.
.+++.<-.>>>.<<.+++.------.>-.<<+.<.

You are not a fascist aren’t you?

If you want to be able to run program like that:

>++++++++[-<+++++++++>]<.>>+>-[+]++>++>+++[>[->+++<<+++>]<<]>-----.>->
+++..+++.>-.<<+[>[+>+]>>]<--------------.>>.+++.------.--------.>+.>+.

You need to handle negative cells which you don’t currently:

brainfuck-interpreter/brainfuck-interpreter.c

Lines 76 to 82 in dab492f

t = (unsigned char *) malloc(buflen * sizeof(unsigned char));
if (t == NULL)
handle_error("malloc");
bzero(t, buflen);
ptr = t;

I guess an easy fix would be to move the starting pointer to the middle of the allocated memory so the brainfuck program would be able to go either to the left or to the right:

// ptr = t;
ptr = t + (buflen / 2);

Also the fascist appellation for this kind of interpreter come from here: http://www.hevanet.com/cristofd/brainfuck/

Jumps are broken

brainfuck-interpreter/brainfuck-interpreter.c

Lines 104 to 113 in dab492f

case '[':
if (!*ptr)
while (buffer[i++] != ']');
break;
case ']':
if (*ptr)
while (buffer[i--] != '[');
break;

Theses two instructions should jump to the matching brackets, not just to the closest brackets.

On esolangs you can read this about theses two instructions:

Command Description
[ Jump past the matching ] if the cell under the pointer is 0
] Jump back to the matching [ if the cell under the pointer is nonzero

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