+
+// get the base part of the path (everything but the extension.)
+string SGPath::base() const {
+ int index = path.rfind(".");
+ if ((index >= 0) && (path.find("/", index) == string::npos)) {
+ return path.substr(0, index);
+ } else {
+ return "";
+ }
+}
+
+// get the extension (everything after the final ".")
+// but make sure no "/" follows the "." character (otherwise it
+// is has to be a directory name containing a ".").
+string SGPath::extension() const {
+ int index = path.rfind(".");
+ if ((index >= 0) && (path.find("/", index) == string::npos)) {
+ return path.substr(index + 1);
+ } else {
+ return "";
+ }
+}
+
+bool SGPath::exists() const {
+ FILE* fp = fopen( path.c_str(), "r");
+ if (fp == 0) {
+ return false;
+ }
+ fclose(fp);
+ return true;
+}
+
+#if defined( _MSC_VER) || defined(__MINGW32__)
+# define sgMkDir(d,m) _mkdir(d)
+#else
+# define sgMkDir(d,m) mkdir(d,m)
+#endif
+
+
+int SGPath::create_dir( mode_t mode ) {
+ string_list dirlist = sgPathSplit(dir());
+ if ( dirlist.empty() )
+ return -1;
+ string path = dirlist[0];
+ string_list path_elements = sgPathBranchSplit(path);
+ bool absolute = !path.empty() && path[0] == sgDirPathSep;
+
+ unsigned int i = 1;
+ SGPath dir = absolute ? string( 1, sgDirPathSep ) : "";
+ dir.concat( path_elements[0] );
+#if defined( _MSC_VER) || defined(__MINGW32__)
+ if ( dir.str().find(':') != string::npos && path_elements.size() >= 2 ) {
+ dir.append( path_elements[1] );
+ i = 2;
+ }
+#endif
+ struct stat info;
+ int r;
+ for(; ( r = stat( dir.c_str(), &info ) ) == 0 && i < path_elements.size(); i++) {
+ dir.append(path_elements[i]);
+ }
+ if ( r == 0 ) {
+ return 0; // Directory already exists
+ }
+ if ( sgMkDir( dir.c_str(), mode) ) {
+ SG_LOG( SG_IO, SG_ALERT, "Error creating directory: " + dir.str() );
+ return -2;
+ }
+ for(; i < path_elements.size(); i++) {
+ dir.append(path_elements[i]);
+ if ( sgMkDir( dir.c_str(), mode) ) {
+ SG_LOG( SG_IO, SG_ALERT, "Error creating directory: " + dir.str() );
+ return -2;
+ }
+ }
+
+ return 0;
+}
+
+string_list sgPathBranchSplit( const string &dirpath ) {
+ string_list path_elements;
+ string element, path = dirpath;
+ while ( path.size() ) {
+ size_t p = path.find( sgDirPathSep );
+ if ( p != string::npos ) {
+ element = path.substr( 0, p );
+ path.erase( 0, p + 1 );
+ } else {
+ element = path;
+ path = "";
+ }
+ if ( element.size() )
+ path_elements.push_back( element );
+ }
+ return path_elements;
+}
+
+
+string_list sgPathSplit( const string &search_path ) {
+ string tmp = search_path;
+ string_list result;
+ result.clear();
+
+ bool done = false;
+
+ while ( !done ) {
+ int index = tmp.find(sgSearchPathSep);
+ if (index >= 0) {
+ result.push_back( tmp.substr(0, index) );
+ tmp = tmp.substr( index + 1 );
+ } else {
+ if ( !tmp.empty() )
+ result.push_back( tmp );
+ done = true;
+ }
+ }
+
+ return result;
+}