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InfluxDB
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Interesting. I know nothing about OSC or even what it really does. But a bit of searching turns up this: https://github.com/mhroth/tinyosc. Does that look helpful at all?
The operations you're talking about with the example of loading 3d data is the realm of parsing, and there's a LOT of theory available and a LOT of code available for how to implement things -- there are TONS of options. Since you don't know where to start you should investigate parsing generally in C. I highly recommend you take a look at an existing library in C that loads 3d data, like this library https://github.com/thisistherk/fast_obj/blob/master/fast_obj.h that deals with OBJ the format.