A circular/ring buffer written in C
A python extension implementing a circular/ring buffer of characters as a C extension. It overwrites silently.
Currently, pyringbuf is available at https://pypi.python.org/pypi/pyringbuf, or via pip install pyringbuf. As this is a C extension, there is a compilation step, so your system will need to be able to compile extension modules for python.
>>> from ringbuf import RingBuffer >>> R = RingBuffer(5) #choose your buffer size >>> R.push("a") #push a single character into the buffer >>> R.pop() #pop a single character 'a' >>> R.write("bcdef") #fill buffer with many characters at once >>> R.read(4) #read many characters at once 'bcde' >>> R.read(1) 'f' >>> R.read(1) #returns an empty string if the buffer is empty ''
For the interested, this has been implemented as a pure C extension. The ring buffer itself is implemented as a fixed length array of chars (8-bit signed), dynamically allocated on the Python Heap on instantiation of a buffer. Read and write indexes both increase monotonically, and addresses in the array are determined using index % (modulo) buffer size. Writing more than the buffer size at once throws an exception, otherwise if writing overtakes the read index in the modulo space the buffer contents are silently overwritten.
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