1 files changed, 15 insertions, 0 deletions
diff --git a/third_party/rust/serde_json/src/lexical/digit.rs b/third_party/rust/serde_json/src/lexical/digit.rs
new file mode 100644
index 0000000000..882aa9eef2
--- /dev/null
+++ b/third_party/rust/serde_json/src/lexical/digit.rs
@@ -0,0 +1,15 @@
+// Adapted from https://github.com/Alexhuszagh/rust-lexical.
+
+//! Helpers to convert and add digits from characters.
+
+// Convert u8 to digit.
+#[inline]
+pub(crate) fn to_digit(c: u8) -> Option<u32> {
+    (c as char).to_digit(10)
+}
+
+// Add digit to mantissa.
+#[inline]
+pub(crate) fn add_digit(value: u64, digit: u32) -> Option<u64> {
+    value.checked_mul(10)?.checked_add(digit as u64)
+}