Bounded Flushing Input (Brainfuck)

bounded_flushing_input.bf

[
# Bounded flushing input for string, (unoptimized for easy reading)
# Iterations are predetermined
# This example takes a max of four characters

# Precondition: Start at origin
#				Array has empty cell before it
#				Empty "array" series of cells
# Postcondition: End at origin
#				All cells(except last) in "arrays" are filled with input from keyboard
#				until <enter> or until array ends. In this example, the array is FIVE
#				characters long(Last character ends with \0)
#
# Concept:
#			>(&a)
#
#			{,----------[++++++++++>}(^a-1)
#
#			+[,----------] # Flush
#
#			](^a-1)
#
#			<[<]<(&a-1)
]

# Go to address
>>>

# Read input
,

# If not \n
----------[++++++++++

# Read next character
>, 

# Two more times
----------[++++++++++
>,
----------[++++++++++
>,

# flush input if last input was not \n
----------[++++++++++>+[,----------]]

# End "loops"
]]]

# Return to head of string
<[<]> 

# Go to origin
<<<