Inspecting C pipelines passing through a program — border cases?

My suggestion: have two buffers, and rotate between them.

Assuming you know the maximum length M of the possible regular expression matches (or can live with an arbitrary value - or just use the whole buffer), you could handle it by not passing on the full buffer but keep M-1 bytes back. In the next iteration put the new received data at the end of the M-1 bytes and apply the regular expression.

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