- speedup

1 files changed, 37 insertions, 0 deletions

diff --git a/epgsearchtools.h b/epgsearchtools.h
index 325b25c..3ca85c4 100644
--- a/epgsearchtools.h
+++ b/epgsearchtools.h
@@ -151,4 +151,41 @@ public:
 	}
 };
 
+// --- icstring ------------------------------------------
+// a case-insensitive string class
+
+struct ignorecase_traits : public std::char_traits<char> {
+    // return whether c1 and c2 are equal
+    static bool eq(const char& c1, const char& c2) {
+      return (c1==c2 || std::toupper(c1)==std::toupper(c2));
+    }
+    // return whether c1 is less than c2
+    static bool lt(const char& c1, const char& c2) {
+      return std::toupper(c1)<std::toupper(c2);
+    }
+    // compare up to n characters of s1 and s2
+    static int compare(const char* s1, const char* s2,
+                       std::size_t n) {
+        for (std::size_t i=0; i<n; ++i) {
+            if (!eq(s1[i],s2[i])) {
+                return lt(s1[i],s2[i])?-1:1;
+            }
+        }
+        return 0;
+    }
+    // search c in s
+    static const char* find(const char* s, std::size_t n,
+                            const char& c) {
+        for (std::size_t i=0; i<n; ++i) {
+            if (eq(s[i],c)) {
+                return &(s[i]);
+            }
+        }
+        return 0;
+    }
+};
+
+// define a special type for such strings
+typedef std::basic_string<char,ignorecase_traits> icstring;
+
 #endif