From 87647ba1cd1cc88a870af3bd6ad464549c5339bb Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik@eossweden.org>
Date: Tue, 14 Jan 2020 10:20:22 +0100
Subject: [PATCH] string: adding base58_strip() function

---
 src/string.cpp | 12 ++++++++++++
 src/string.h   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/src/string.cpp b/src/string.cpp
index 91eed0e..a8c4e99 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -66,3 +66,15 @@ std::string& rtrim(std::string& str) {
 std::string& trim(std::string& str) {
 	return ltrim(rtrim(str));
 }
+
+static bool _is_base58(char ch) {
+	static std::string alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+	return alphabet.find(ch) != std::string::npos;
+}
+
+std::string& base58_strip(std::string &str) {
+	str.erase(std::remove_if(str.begin(), str.end(), [] (std::string::value_type ch)
+		{ return !_is_base58(ch); }
+	), str.end());
+    return str;
+}
diff --git a/src/string.h b/src/string.h
index 9c8bf67..38c0440 100644
--- a/src/string.h
+++ b/src/string.h
@@ -39,4 +39,6 @@ std::string& rtrim(std::string& str);
 std::string& ltrim(std::string& str);
 std::string& trim(std::string& str);
 
+std::string& base58_strip(std::string &str);
+
 #endif /* STRING_H */