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seq: Update doc for fast_inc

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Nicolas Boichat 2025-04-04 18:04:33 +02:00
parent c311e208ae
commit 03b2cab650
1 changed files with 10 additions and 4 deletions
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14
src/uu/seq/src/seq.rs
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@ -259,10 +259,16 @@ pub fn uu_app() -> Command {
) )
} }
// Fast code path increment function. /// Fast code path increment function.
// Add inc to the string val[start..end]. This operates on ASCII digits, assuming ///
// val and inc are well formed. /// Add inc to the string val[start..end]. This operates on ASCII digits, assuming
// Returns the new value for start. /// val and inc are well formed.
///
/// Returns the new value for start (can be less that the original value if we
/// have a carry or if inc > start).
///
/// We also assume that there is enough space in val to expand if start needs
/// to be updated.
fn fast_inc(val: &mut [u8], start: usize, end: usize, inc: &[u8]) -> usize { fn fast_inc(val: &mut [u8], start: usize, end: usize, inc: &[u8]) -> usize {
// To avoid a lot of casts to signed integers, we make sure to decrement pos // To avoid a lot of casts to signed integers, we make sure to decrement pos
// as late as possible, so that it does not ever go negative. // as late as possible, so that it does not ever go negative.