Benul
Benul is an esoteric programming language created by user:David.werecat where the source code is only BEL and NUL characters.
Instructions
All Benul programs are required to have a pleasing sound when displayed on a terminal. The bit queue begins empty with the current value set to 0. Each run of BEL or NUL characters is interpreted as an instruction. If a run exceeds five consecutive characters, it is broken up into multiple runs starting at length five until the end of the run. Runs are not broken by characters other than BEL and NUL, since unrecognizable characters are not interpreted. However, it is not recommended to use other characters. Console IO is performed bitwise, but is buffered per byte. Each byte is read/written from MSB to LSB. The program runs in a loop and requires special conditions to terminate (see below).
| Run | Description |
|---|---|
| 1 NUL | NOP. |
| 2 NULs | Enqueue the current value in the queue and set the current value to the value dequeued from the queue afterwards. |
| 3 NULs | Flip the current value. |
| 4 NULs | If the current value is 0, skip ahead to the next 4NUL. If there is no next 4NUL, end the program. |
| 5 NULs | Set the current value to 0. |
| 1 BEL | NOP. |
| 2 BELs | Read a bit from STDIN to the current value. |
| 3 BELs | Write the current value to STDOUT. |
| 4 BELs | Enqueue a new 0 in the queue (expand queue size). |
| 5 BELs | Set the current value to 1. |
Examples
The following are hex dumps of the programs (for better visibility).
Terminating Program
00 00 00 00
CAT Program
07 07 00 07 07 07
Truth Machine
00 00 00 07 00 00 00 00 07 07 07 07 00 07 07 00 07 07 00 07 07 00 07 07 00 07 07 00 07 07 00 07 07 00 07 07 00 00 07 00 00 00 07 00 00 00 00 07 00 00 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 07 07 07 00 00 00 00 07 00 00 07 00 00 00
Hello, world!
00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 07 07 00 07 07 07 00 07 07 07 00 07 07 07 00 00 00 07 07 07 00 00 00 07 00 00 00 00