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do length check in PartialString::range_from (#412)

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Mark Thom
2020-04-28 17:20:14 -06:00
parent 97115a9c1c
commit eefd36b50d
1 changed files with 5 additions and 1 deletions
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4
src/prolog/machine/partial_string.rs
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@@ -202,7 +202,11 @@ impl PartialString {
#[inline] #[inline]
pub fn range_from(&self, index: RangeFrom<usize>) -> PStrIter { pub fn range_from(&self, index: RangeFrom<usize>) -> PStrIter {
if self.len >= '\u{0}'.len_utf8() {
PStrIter::from(self.buf, self.len - '\u{0}'.len_utf8(), index.start) PStrIter::from(self.buf, self.len - '\u{0}'.len_utf8(), index.start)
} else {
PStrIter::from(self.buf, 0, 0)
}
} }
#[inline] #[inline]