From d8b229031342ab3f27dcf9be7e37ac5088c9624e Mon Sep 17 00:00:00 2001
From: Drake Youngkun Min <minykreva@gmail.com>
Date: Thu, 24 Nov 2016 16:46:11 +0900
Subject: [PATCH] Add 'fromString(const char*)', 'fromString(const String)' to
 IPAddress class (#68)

---
 cores/esp32/IPAddress.cpp | 41 +++++++++++++++++++++++++++++++++++++++
 cores/esp32/IPAddress.h   |  3 +++
 2 files changed, 44 insertions(+)

diff --git a/cores/esp32/IPAddress.cpp b/cores/esp32/IPAddress.cpp
index 635c8bf0a..f932d7bf5 100644
--- a/cores/esp32/IPAddress.cpp
+++ b/cores/esp32/IPAddress.cpp
@@ -79,3 +79,44 @@ String IPAddress::toString()
     return String(szRet);
 }
 
+bool IPAddress::fromString(const char *address)
+{
+    // TODO: add support for "a", "a.b", "a.b.c" formats
+
+    uint16_t acc = 0; // Accumulator
+    uint8_t dots = 0;
+
+    while (*address)
+    {
+        char c = *address++;
+        if (c >= '0' && c <= '9')
+        {
+            acc = acc * 10 + (c - '0');
+            if (acc > 255) {
+                // Value out of [0..255] range
+                return false;
+            }
+        }
+        else if (c == '.')
+        {
+            if (dots == 3) {
+                // Too much dots (there must be 3 dots)
+                return false;
+            }
+            _address.bytes[dots++] = acc;
+            acc = 0;
+        }
+        else
+        {
+            // Invalid char
+            return false;
+        }
+    }
+
+    if (dots != 3) {
+        // Too few dots (there must be 3 dots)
+        return false;
+    }
+    _address.bytes[3] = acc;
+    return true;
+}
\ No newline at end of file
diff --git a/cores/esp32/IPAddress.h b/cores/esp32/IPAddress.h
index 980be00f7..7c48b6734 100644
--- a/cores/esp32/IPAddress.h
+++ b/cores/esp32/IPAddress.h
@@ -51,6 +51,9 @@ public:
     IPAddress(const uint8_t *address);
     virtual ~IPAddress() {}
 
+    bool fromString(const char *address);
+    bool fromString(const String &address) { return fromString(address.c_str()); }
+
     // Overloaded cast operator to allow IPAddress objects to be used where a pointer
     // to a four-byte uint8_t array is expected
     operator uint32_t() const
-- 
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