Merge branch 'ethernet-dns-fix' of https://github.com/cmaglie/Arduino

1 files changed, 42 insertions, 0 deletions

diff --git a/cores/arduino/IPAddress.cpp b/cores/arduino/IPAddress.cpp
index 899cbd4..76aefa8 100644
--- a/cores/arduino/IPAddress.cpp
+++ b/cores/arduino/IPAddress.cpp
@@ -43,6 +43,48 @@ IPAddress::IPAddress(const uint8_t *address)
     memcpy(_address.bytes, address, sizeof(_address.bytes));
 }
 
+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;
+}
+
 IPAddress& IPAddress::operator=(const uint8_t *address)
 {
     memcpy(_address.bytes, address, sizeof(_address.bytes));