uucore: format: Collection of small parser fixes

src/uucore/src/lib/features/format/argument.rs

@@ -105,9 +105,13 @@ fn extract_value<T: Default>(p: Result<T, ExtendedParserError<'_, T>>, input: &s
                 },
             );
             match e {
-                ExtendedParserError::Overflow => {
+                ExtendedParserError::Overflow(v) => {
                     show_error!("{}: Numerical result out of range", input.quote());
-                    Default::default()
+                    v
+                }
+                ExtendedParserError::Underflow(v) => {
+                    show_error!("{}: Numerical result out of range", input.quote());
+                    v
                 }
                 ExtendedParserError::NotNumeric => {
                     show_error!("{}: expected a numeric value", input.quote());

src/uucore/src/lib/features/format/extendedbigdecimal.rs

@@ -23,6 +23,7 @@
 use std::cmp::Ordering;
 use std::fmt::Display;
 use std::ops::Add;
+use std::ops::Neg;
 
 use bigdecimal::BigDecimal;
 use num_traits::FromPrimitive;
@@ -227,6 +228,27 @@ impl PartialOrd for ExtendedBigDecimal {
     }
 }
 
+impl Neg for ExtendedBigDecimal {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        match self {
+            Self::BigDecimal(bd) => {
+                if bd.is_zero() {
+                    Self::MinusZero
+                } else {
+                    Self::BigDecimal(bd.neg())
+                }
+            }
+            Self::MinusZero => Self::BigDecimal(BigDecimal::zero()),
+            Self::Infinity => Self::MinusInfinity,
+            Self::MinusInfinity => Self::Infinity,
+            Self::Nan => Self::MinusNan,
+            Self::MinusNan => Self::Nan,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
 

src/uucore/src/lib/features/format/num_format.rs

@@ -80,10 +80,12 @@ pub struct SignedInt {
 
 impl Formatter<i64> for SignedInt {
     fn fmt(&self, writer: impl Write, x: i64) -> std::io::Result<()> {
+        // -i64::MIN is actually 1 larger than i64::MAX, so we need to cast to i128 first.
+        let abs = (x as i128).abs();
         let s = if self.precision > 0 {
-            format!("{:0>width$}", x.abs(), width = self.precision)
+            format!("{:0>width$}", abs, width = self.precision)
         } else {
-            x.abs().to_string()
+            abs.to_string()
         };
 
         let sign_indicator = get_sign_indicator(self.positive_sign, x.is_negative());
@@ -1046,6 +1048,8 @@ mod test {
         let format = Format::<SignedInt, i64>::parse("%d").unwrap();
         assert_eq!(fmt(&format, 123i64), "123");
         assert_eq!(fmt(&format, -123i64), "-123");
+        assert_eq!(fmt(&format, i64::MAX), "9223372036854775807");
+        assert_eq!(fmt(&format, i64::MIN), "-9223372036854775808");
 
         let format = Format::<SignedInt, i64>::parse("%i").unwrap();
         assert_eq!(fmt(&format, 123i64), "123");