Fixed font name parsing

Sources/Silica/CGFont.swift

@@ -70,7 +70,10 @@ public struct CGFont {
                 return nil
             }
 
-            guard name == scaledFont.fullName
+            // Default font is Verdana, make sure the name is correct
+            let defaultFontName = "Verdana"
+
+            guard name == defaultFontName || scaledFont.fullName != defaultFontName
                 else { return nil }
 
             // cache
@@ -170,29 +173,18 @@ internal func FcPattern(name: String) -> (pointer: OpaquePointer, family: String
 
     let cleanup = ErrorCleanup(cleanup: { FcPatternDestroy(pattern) })
 
-    let separator = "-".withCString { (pointer) in return pointer[0] }
+    let separator: Character = "-"
 
     let traits: String?
 
     let family: String
 
-    if let traitsCString = strchr(name, CInt(separator)) {
-
-        let trimmedCString = traitsCString.advanced(by: 1)
-
-        // should free memory, but crashes
-        // defer { free(traitsCString) }
-
-        let traitsString = String(cString: trimmedCString)
-
-        let familyLength = name.utf8.count - traitsString.utf8.count - 1 // for separator
-
-        family = name.substring(range: 0 ..< familyLength)!
-
-        traits = traitsString
-
+    let components = name.split(separator: separator, maxSplits: 2, omittingEmptySubsequences: true)
+
+    if components.count == 2  {
+        family = String(components[0])
+        traits = String(components[1])
     } else {
-
         family = name
         traits = nil
     }
@@ -245,14 +237,3 @@ internal func FcPattern(name: String) -> (pointer: OpaquePointer, family: String
 
     return (pattern, family)
 }
-
-// MARK: - String Extensions
-
-internal extension String {
-
-    func substring(range: Range<Int>) -> String? {
-        let indexRange = utf8.index(utf8.startIndex, offsetBy: range.lowerBound) ..< utf8.index(utf8.startIndex, offsetBy: range.upperBound)
-        let substring = String(utf8[indexRange])
-        return substring
-    }
-}