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## string

The `string` module automatically imports the `err` module.  

#### `byte strzlen(pointer str)`

Calculates the length of a null-terminated string.  
If the string is longer than 255 bytes, then the behaviour is undefined (might even crash).

#### `sbyte strzcmp(pointer str1, pointer str2)`

Compares two strings. Returns 0 if equal, non-0 if not equal.
If any of the strings is longer than 255 bytes, then the behaviour is undefined (might even crash).

#### `void strzcopy(pointer dest, pointer src)`

Copies the source null-terminated string into the destination buffer.
If the source string is longer than 255 bytes, then the behaviour is undefined (might even crash).

#### `word strz2word(pointer str)`

Converts a null-terminated string to a number.
Sets `errno`.