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-rw-r--r--src/internal/itoa/README.md2
-rw-r--r--src/internal/itoa/itoa.go33
-rw-r--r--src/internal/itoa/itoa_test.go40
3 files changed, 75 insertions, 0 deletions
diff --git a/src/internal/itoa/README.md b/src/internal/itoa/README.md
new file mode 100644
index 000000000..6b666d121
--- /dev/null
+++ b/src/internal/itoa/README.md
@@ -0,0 +1,2 @@
+internal/itoa is new to go as of 1.17.
+This directory should be removed when tinygo drops support for go 1.16.
diff --git a/src/internal/itoa/itoa.go b/src/internal/itoa/itoa.go
new file mode 100644
index 000000000..c6062d9fe
--- /dev/null
+++ b/src/internal/itoa/itoa.go
@@ -0,0 +1,33 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Simple conversions to avoid depending on strconv.
+
+package itoa
+
+// Itoa converts val to a decimal string.
+func Itoa(val int) string {
+ if val < 0 {
+ return "-" + Uitoa(uint(-val))
+ }
+ return Uitoa(uint(val))
+}
+
+// Uitoa converts val to a decimal string.
+func Uitoa(val uint) string {
+ if val == 0 { // avoid string allocation
+ return "0"
+ }
+ var buf [20]byte // big enough for 64bit value base 10
+ i := len(buf) - 1
+ for val >= 10 {
+ q := val / 10
+ buf[i] = byte('0' + val - q*10)
+ i--
+ val = q
+ }
+ // val < 10
+ buf[i] = byte('0' + val)
+ return string(buf[i:])
+}
diff --git a/src/internal/itoa/itoa_test.go b/src/internal/itoa/itoa_test.go
new file mode 100644
index 000000000..71931c1e3
--- /dev/null
+++ b/src/internal/itoa/itoa_test.go
@@ -0,0 +1,40 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package itoa_test
+
+import (
+ "fmt"
+ "internal/itoa"
+ "math"
+ "testing"
+)
+
+var (
+ minInt64 int64 = math.MinInt64
+ maxInt64 int64 = math.MaxInt64
+ maxUint64 uint64 = math.MaxUint64
+)
+
+func TestItoa(t *testing.T) {
+ tests := []int{int(minInt64), math.MinInt32, -999, -100, -1, 0, 1, 100, 999, math.MaxInt32, int(maxInt64)}
+ for _, tt := range tests {
+ got := itoa.Itoa(tt)
+ want := fmt.Sprint(tt)
+ if want != got {
+ t.Fatalf("Itoa(%d) = %s, want %s", tt, got, want)
+ }
+ }
+}
+
+func TestUitoa(t *testing.T) {
+ tests := []uint{0, 1, 100, 999, math.MaxUint32, uint(maxUint64)}
+ for _, tt := range tests {
+ got := itoa.Uitoa(tt)
+ want := fmt.Sprint(tt)
+ if want != got {
+ t.Fatalf("Uitoa(%d) = %s, want %s", tt, got, want)
+ }
+ }
+}