This API provides a
<stdio.h>-like API wrapper around ICU‘s other formatting and parsing APIs. It is meant to ease the transition of adding Unicode support to a preexisting applications using stdio. The following is a small list of noticable differences between stdio and ICU I/O’s ustdio implementation.
u_fstropencan be used to simulate file IO with strings. This is similar to the iostream API, and it allows locale specific formatting and parsing to be used.