[−][src]Function printf_compat::output::fmt_write

pub fn fmt_write(w: &mut impl Write) -> impl FnMut(Argument<'_>) -> c_int + '_

Write to a struct that implements fmt::Write.

Differences

There are a few differences from standard printf format:

  • only valid UTF-8 data can be printed.
  • an X format specifier with a # flag prints the hex data in uppercase, but the leading 0x is still lowercase
  • an o format specifier with a # flag precedes the number with an o instead of 0
  • g/G (shorted floating point) is aliased to f/`F`` (decimal floating point)
  • same for a/A (hex floating point)
  • the n format specifier, Specifier::WriteBytesWritten, is not implemented and will cause an error if encountered.