[*] Initial commit

lonetix/stricmp.c

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+/**
+ * \file stricmp.c
+ *
+ * Implements `Df_stricmp()`.
+ *
+ * \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
+ * \author    Lorenzo Cogotti
+ */
+
+#include "strlib.h"
+
+int Df_stricmp(const char *a, const char *b)
+{
+	int c1, c2;
+
+	do {
+		c1 = *a++;
+		c2 = *b++;
+
+		// Avoid converting case unless char differ
+		int d = c1 - c2;
+		while (d != 0) {
+			if (c1 <= 'Z' && c1 >= 'A') {
+				d += ('a' - 'A');
+				if (d == 0)
+					break;
+			}
+			if (c2 <= 'Z' && c2 >= 'A') {
+				d -= ('a' - 'A');
+				if (d == 0)
+					break;
+			}
+			return ((d >= 0) << 1) - 1;
+		}
+	} while (c1 != '\0');
+
+	return 0;  // strings are equal
+}