The write_unsafe function takes an output stream, a precompiled format string, and a list of arguments. The arguments will be formatted according to the specified format string into the output stream provided.

See the documentation for format for why this function is unsafe and care should be taken if calling it manually.

Thankfully the rust compiler provides the macro fmtf! which will perform all of this validation at compile-time and provides a safe interface for invoking this function.

Arguments

• output - the buffer to write output to
• fmts - the precompiled format string to emit
• args - the list of arguments to the format string. These are only the positional arguments (not named)

Note that this function assumes that there are enough arguments for the format string.