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Don't panic in ceil_char_boundary #112387

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Aug 15, 2023
Merged

Don't panic in ceil_char_boundary #112387

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43453a8
Don't panic in ceil_char_boundary
clarfonthey Jun 7, 2023
d47371d
Fix test
clarfonthey Jun 8, 2023
2f75dd4
Fix typo.
m-ou-se Aug 15, 2023
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7 changes: 2 additions & 5 deletions library/alloc/tests/str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2416,10 +2416,7 @@ fn ceil_char_boundary() {
check_many("🇯🇵", 0..=0, 0);
check_many("🇯🇵", 1..=4, 4);
check_many("🇯🇵", 5..=8, 8);
}

#[test]
#[should_panic]
fn ceil_char_boundary_above_len_panic() {
let _ = "x".ceil_char_boundary(2);
// above len
check_many("hello", 5..=10, 5);
}
7 changes: 3 additions & 4 deletions library/core/src/str/mod.rs
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Expand Up @@ -271,14 +271,13 @@ impl str {

/// Finds the closest `x` not below `index` where `is_char_boundary(x)` is `true`.
///
/// If `index` is greater than the length of the string, this returns the length of the string.
///
/// This method is the natural complement to [`floor_char_boundary`]. See that method
/// for more details.
///
/// [`floor_char_boundary`]: str::floor_char_boundary
///
/// # Panics
///
/// Panics if `index > self.len()`.
///
/// # Examples
///
Expand All @@ -296,7 +295,7 @@ impl str {
#[inline]
pub fn ceil_char_boundary(&self, index: usize) -> usize {
if index > self.len() {
slice_error_fail(self, index, index)
self.len()
} else {
let upper_bound = Ord::min(index + 4, self.len());
self.as_bytes()[index..upper_bound]
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