From b7305900594629b5d965f8badb90073d062afcc4 Mon Sep 17 00:00:00 2001
From: Ron Evans <ron@hybridgroup.com>
Date: Mon, 7 Oct 2019 18:24:51 +0200
Subject: [PATCH] runtime/all: add implementation of bytealg.CountString to
 complete #424

Signed-off-by: Ron Evans <ron@hybridgroup.com>
---
 src/runtime/string.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/runtime/string.go b/src/runtime/string.go
index 30736d30..cf6d0af6 100644
--- a/src/runtime/string.go
+++ b/src/runtime/string.go
@@ -216,3 +216,16 @@ func indexByteString(s string, c byte) int {
 	}
 	return -1
 }
+
+// countString copies the implementation from
+// https://github.com/golang/go/blob/67f181bfd84dfd5942fe9a29d8a20c9ce5eb2fea/src/internal/bytealg/count_generic.go#L1
+//go:linkname countString internal/bytealg.CountString
+func countString(s string, c byte) int {
+	n := 0
+	for i := 0; i < len(s); i++ {
+		if s[i] == c {
+			n++
+		}
+	}
+	return n
+}