Struct FmtBuf 

pub struct FmtBuf<'a> { /* private fields */ }

Zero-allocation stack buffer that implements core::fmt::Write.

One byte is always reserved for a null terminator so that as_cstr can return a C-compatible string without a mutable borrow.

Implementations

impl<'a> FmtBuf<'a>

pub fn new(buf: &'a mut [u8]) -> Self

Create a new FmtBuf backed by buf.

The usable capacity is buf.len() - 1 because one byte is reserved for the null terminator.

pub fn as_bytes(&self) -> &[u8]

Returns the formatted content as a byte slice (no null terminator).

pub fn as_cstr(&self) -> &[u8]

Returns the formatted content as a null-terminated byte slice, suitable for passing to C APIs like LVGL.

Trait Implementations

impl Write for FmtBuf<'_>

fn write_str(&mut self, s: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a char into this writer, returning whether the write succeeded.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Glue for usage of the write! macro with implementors of this trait.