From 31b17e83a66a629c5b0cf41e191ea003be89fc95 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Wed, 3 Jul 2024 22:09:47 +0900
Subject: [PATCH] fix(fmt): fix the case when mantissa exceeds 10 by rounding
 and exponent is negative

---
 fmt/printf.ts      | 2 +-
 fmt/printf_test.ts | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/fmt/printf.ts b/fmt/printf.ts
index 6c5bc78f18e9..7a9b3d6e076d 100644
--- a/fmt/printf.ts
+++ b/fmt/printf.ts
@@ -718,7 +718,7 @@ class Printf {
       if (10 <= mantissa) {
         mantissa = 1;
         const r = parseInt(esign + e) + 1;
-        e = r.toString();
+        e = Math.abs(r).toString();
         esign = r < 0 ? "-" : "+";
       }
     }
diff --git a/fmt/printf_test.ts b/fmt/printf_test.ts
index 2c49b7ad7d99..6b143125f104 100644
--- a/fmt/printf_test.ts
+++ b/fmt/printf_test.ts
@@ -108,6 +108,7 @@ Deno.test("sprintf() handles floats", function () {
   assertEquals(sprintf("%e", Number.MIN_SAFE_INTEGER), "-9.007199e+15");
   assertEquals(sprintf("%.3e", 1.9999), "2.000e+00");
   assertEquals(sprintf("%.3e", 29.99999), "3.000e+01");
+  assertEquals(sprintf("%.3e", 0.000099999), "1.000e-04");
 });
 Deno.test("sprintf() handles floatE", function () {
   assertEquals(sprintf("%E", 4), "4.000000E+00");