Measure delay between stdin characters

Overview

Outputs delay in microseconds between each single-byte call to read(3). Note that this is most useful in measuring input streams where there is fairly large natural delay between characters, because making a system call per byte would naturally slow down bulk reads.

My own use case is measuring timed bytes from UART to check the clock-tree calibration of an MCU.

Building

To build, simply run make. Requires C99 and POSIX 2001 (issue 6).