add rsutils/string/nocase.h

third-party/rsutils/include/rsutils/string/nocase.h

@@ -0,0 +1,71 @@
+// License: Apache 2.0. See LICENSE file in root directory.
+// Copyright(c) 2023 Intel Corporation. All Rights Reserved.
+#pragma once
+
+#include <string.h>  // strcasecmp in linux
+
+#ifdef _MSC_VER
+#define strcasecmp _stricmp
+#define strncasecmp _strnicmp
+#endif
+
+
+namespace rsutils {
+namespace string {
+
+
+// Use in containers:
+//      std::map< KEY, VALUE, nocase_less_t >
+//
+struct nocase_less_t
+{
+    // case-independent (ci) compare_less binary function
+    bool operator()( std::string const & l, std::string const & r ) const
+    {
+        // If internationalization or embedded NULLs aren't an issue, this should be faster than the STL
+        return strcasecmp( l.c_str(), r.c_str() ) < 0;
+        //return std::lexicographical_compare( s1.begin(), s1.end(),
+        //                                     s2.begin(), s2.end(),
+        //                                     nocase_compare() );  // comparison
+    }
+};
+
+
+inline int nocase_compare( std::string const & l, std::string const & r )
+{
+    return strcasecmp( l.c_str(), r.c_str() );
+}
+inline int nocase_compare( std::string const & l, char const * r )
+{
+    return strcasecmp( l.c_str(), r );
+}
+inline int nocase_compare( char const * l, std::string const & r )
+{
+    return strcasecmp( l, r.c_str() );
+}
+inline int nocase_compare( char const * l, char const * r )
+{
+    return strcasecmp( l, r );
+}
+
+
+inline int nocase_equal( std::string const & l, std::string const & r )
+{
+    return l.length() == r.length() && 0 == strcasecmp( l.c_str(), r.c_str() );
+}
+inline int nocase_equal( std::string const & l, char const * r )
+{
+    return 0 == strcasecmp( l.c_str(), r );
+}
+inline int nocase_equal( char const * l, std::string const & r )
+{
+    return 0 == strcasecmp( l, r.c_str() );
+}
+inline int nocase_equal( char const * l, char const * r )
+{
+    return 0 == strcasecmp( l, r );
+}
+
+
+}  // namespace string
+}  // namespace rsutils