From fa0fbde2369553ebdc538bf761db8ab274f1bce4 Mon Sep 17 00:00:00 2001
From: Paul Z <pzeinlinger@users.noreply.github.com>
Date: Tue, 14 Dec 2021 15:42:09 +0100
Subject: [PATCH] substring: don't fail if start, end out of bounds

---
 strings.go | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/strings.go b/strings.go
index e0ae628c..fd46ecd4 100644
--- a/strings.go
+++ b/strings.go
@@ -224,13 +224,21 @@ func splitn(sep string, n int, orig string) map[string]string {
 //
 // If start is >= 0 and end < 0 or end bigger than s length, this calls string[start:]
 //
+// If start >= len(s) this returns an empty string
+//
 // Otherwise, this calls string[start, end].
 func substring(start, end int, s string) string {
-	if start < 0 {
-		return s[:end]
+	if start >= len(s) {
+		return ""
+	}
+	if start < 0  {
+		start = 0
+	}
+	if end > len(s) {
+		end = len(s)
 	}
-	if end < 0 || end > len(s) {
-		return s[start:]
+	if start > end {
+		end = start
 	}
 	return s[start:end]
 }