otherfunc-brainfuck

Brainfuck interpreter with pre-compiled bracket map and configurable instruction limits.

Implementation

• 8 standard commands (> < + - . , [ ]), all other characters are ignored
• 33,000-cell tape of u8 values with wrapping arithmetic
• Cells 0–29,999: normal workspace; cells 30,000–32,004: memory-mapped I/O region
• Pre-compiles a HashMap<usize, usize> bracket map for O(1) jump lookups
• Default instruction limit: 10,000,000 (configurable via with_instruction_limit())
• Detects unmatched brackets at compile time before execution begins

Memory-Mapped I/O

The tape region from cell 30,000 onward provides HTTP, KV storage, and environment variable access without any new commands:

Region	Cells	Purpose
URL / Key buffer	30,000–30,499	Write URL or KV key here
Body / Value buffer	30,500–30,999	Write POST body or KV value here
Response buffer	31,000–31,999	Read response data here
IO_STATUS	32,000	HTTP status or success flag
IO_METHOD	32,001	1=GET, 2=POST, 3=KV_GET, 4=KV_SET, 5=KV_DEL, 6=ENV
IO_RESP_LEN	32,002–32,003	Response length (big-endian u16)
IO_EXEC	32,004	Write non-zero here to trigger the I/O operation

Install

cargo install --path .

Usage

# Inline code
bf "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++."

# From file
bf -f program.bf

# Piped input (for , commands)
echo "hello" | bf ",+.>,.>,."

As a Library

use otherfunc_brainfuck::BrainfuckInterpreter;
use otherfunc_core::Interpreter;

let mut bf = BrainfuckInterpreter::new();
let output = bf.execute("++++++[>++++++++++<-]>+++++.", "").unwrap();
assert_eq!(output, "A");

Tests

cargo test -p otherfunc-brainfuck    # 19 tests