From 3cdd512e8bf6d04bbf10312afcbe5069607a8c5c Mon Sep 17 00:00:00 2001
From: Hexa Dust <hxd@hexadust.net>
Date: Fri, 18 Jul 2025 21:19:30 +0100
Subject: [PATCH] impl uDisplay for Decimal

---
 src/calc.rs |  4 ++--
 src/lib.rs  | 27 ++++++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/calc.rs b/src/calc.rs
index b80a724..78b41c5 100644
--- a/src/calc.rs
+++ b/src/calc.rs
@@ -32,8 +32,8 @@ pub struct StackCalc<F: FloatCore, const STACK: usize = 2, const DSIZE: usize =
 }
 
 #[cfg(feature = "ufmt")]
-impl<F: FloatCore + ufmt::uDebug, const STACK: usize, const DSIZE: usize, EXP: ufmt::uDebug>
-    ufmt::uDebug for StackCalc<F, STACK, DSIZE, EXP>
+impl<F: FloatCore, const STACK: usize, const DSIZE: usize, EXP: ufmt::uDebug> ufmt::uDebug
+    for StackCalc<F, STACK, DSIZE, EXP>
 {
     fn fmt<W>(&self, f: &mut ufmt::Formatter<'_, W>) -> Result<(), W::Error>
     where
diff --git a/src/lib.rs b/src/lib.rs
index 9d263bd..b5acf1a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,8 @@ use num_traits::float::FloatCore;
 use num_traits::{one, zero, PrimInt, Unsigned};
 #[cfg(feature = "ufmt")]
 use ufmt::derive::uDebug;
+#[cfg(feature = "ufmt")]
+use ufmt::{uDebug, uDisplay, uwrite};
 
 #[derive(Debug)]
 #[cfg_attr(feature = "ufmt", derive(uDebug))]
@@ -33,7 +35,7 @@ pub struct Decimal<const SIZE: usize = 5, EXP = u16> {
 }
 
 #[cfg(feature = "ufmt")]
-impl<const SIZE: usize, EXP: ufmt::uDebug> ufmt::uDebug for Decimal<SIZE, EXP> {
+impl<const SIZE: usize, EXP: uDebug> uDebug for Decimal<SIZE, EXP> {
     fn fmt<W>(&self, f: &mut ufmt::Formatter<'_, W>) -> Result<(), W::Error>
     where
         W: ufmt::uWrite + ?Sized,
@@ -172,6 +174,29 @@ impl<const SIZE: usize, EXP: Display> Display for Decimal<SIZE, EXP> {
     }
 }
 
+#[cfg(feature = "ufmt")]
+impl<const SIZE: usize, EXP: Display + uDisplay> uDisplay for Decimal<SIZE, EXP> {
+    fn fmt<W>(&self, f: &mut ufmt::Formatter<'_, W>) -> Result<(), W::Error>
+    where
+        W: ufmt::uWrite + ?Sized,
+    {
+        if self.minus {
+            uwrite!(f, "-")?;
+        }
+        for i in 0..SIZE {
+            uwrite!(f, "{}", self.significant[i])?;
+            if i == 0 {
+                uwrite!(f, ".")?;
+            }
+        }
+        uwrite!(f, "e")?;
+        if self.minus_exponent {
+            uwrite!(f, "-")?;
+        }
+        uwrite!(f, "{}", self.exponent)
+    }
+}
+
 impl<const SIZE: usize, EXP: PrimInt + Unsigned> TryFrom<f32> for Decimal<SIZE, EXP> {
     type Error = DecimalError;