1 files changed, 53 insertions, 34 deletions

diff --git a/generic/tclPathObj.c b/generic/tclPathObj.c
index 7283608..a86eed8 100644
--- a/generic/tclPathObj.c
+++ b/generic/tclPathObj.c
@@ -10,7 +10,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclPathObj.c,v 1.9 2003/09/29 22:38:21 dkf Exp $
+ * RCS: @(#) $Id: tclPathObj.c,v 1.10 2003/09/30 14:05:44 vincentdarley Exp $
  */
 
 #include "tclInt.h"
@@ -338,25 +338,34 @@ Tcl_FSJoinPath(listObj, elements)
 	}
     }
     
-    if (elements == 2) {
-	/* 
-	 * This is a special case where we can be much more
-	 * efficient
-	 */
-	Tcl_Obj *base;
+    res = Tcl_NewObj();
+    
+    for (i = 0; i < elements; i++) {
+	Tcl_Obj *elt;
+	int driveNameLength;
+	Tcl_PathType type;
+	char *strElt;
+	int strEltLen;
+	int length;
+	char *ptr;
+	Tcl_Obj *driveName = NULL;
+	
+	Tcl_ListObjIndex(NULL, listObj, i, &elt);
 	
-	Tcl_ListObjIndex(NULL, listObj, 0, &base);
 	/* 
-	 * There is only any value in doing this if the first object is
-	 * of path type, otherwise we'll never actually get any
-	 * efficiency benefit elsewhere in the code (from re-using the
-	 * normalized representation of the base object).
+	 * This is a special case where we can be much more
+	 * efficient, where we are joining a single relative path
+	 * onto an object that is already of path type.  The 
+	 * 'TclNewFSPathObj' call below creates an object which
+	 * can be normalized more efficiently.  Currently we only
+	 * use the special case when we have exactly two elements,
+	 * but we could expand that in the future.
 	 */
-	if (base->typePtr == &tclFsPathType
-		&& !(base->bytes != NULL && base->bytes[0] == '\0')) {
+	if ((i == (elements-2)) && (i == 0) && (elt->typePtr == &tclFsPathType)
+	  && !(elt->bytes != NULL && (elt->bytes[0] == '\0'))) {
 	    Tcl_Obj *tail;
 	    Tcl_PathType type;
-	    Tcl_ListObjIndex(NULL, listObj, 1, &tail);
+	    Tcl_ListObjIndex(NULL, listObj, i+1, &tail);
 	    type = TclGetPathType(tail, NULL, NULL, NULL);
 	    if (type == TCL_PATH_RELATIVE) {
 		CONST char *str;
@@ -368,10 +377,20 @@ Tcl_FSJoinPath(listObj, elements)
 		     * '/'.  There's no need to return a special path
 		     * object, when the base itself is just fine!
 		     */
-		    return base;
+		    return elt;
 		}
-		if (str[0] != '.') {
-		    return TclNewFSPathObj(base, str, len);
+		/* 
+		 * If it doesn't begin with '.'  and is a mac or unix
+		 * path or it a windows path without backslashes, then we
+		 * can be very efficient here.  (In fact even a windows
+		 * path with backslashes can be joined efficiently, but
+		 * the path object would not have forward slashes only,
+		 * and this would therefore contradict our 'file join'
+		 * documentation).
+		 */
+		if (str[0] != '.' && ((tclPlatform != TCL_PLATFORM_WINDOWS) 
+				      || (strchr(str, '\\') == NULL))) {
+		    return TclNewFSPathObj(elt, str, len);
 		}
 		/* 
 		 * Otherwise we don't have an easy join, and
@@ -379,24 +398,24 @@ Tcl_FSJoinPath(listObj, elements)
 		 * things
 		 */
 	    } else {
-		return tail;
+		if (tclPlatform == TCL_PLATFORM_UNIX) {
+		    return tail;
+		} else {
+		    CONST char *str;
+		    int len;
+		    str = Tcl_GetStringFromObj(tail,&len);
+		    if (tclPlatform == TCL_PLATFORM_WINDOWS) {
+			if (strchr(str, '\\') == NULL) {
+			    return tail;
+			}
+		    } else if (tclPlatform == TCL_PLATFORM_MAC) {
+			if (strchr(str, '/') == NULL) {
+			    return tail;
+			}
+		    }
+		}
 	    }
 	}
-    }
-    
-    res = Tcl_NewObj();
-    
-    for (i = 0; i < elements; i++) {
-	Tcl_Obj *elt;
-	int driveNameLength;
-	Tcl_PathType type;
-	char *strElt;
-	int strEltLen;
-	int length;
-	char *ptr;
-	Tcl_Obj *driveName = NULL;
-	
-	Tcl_ListObjIndex(NULL, listObj, i, &elt);
 	strElt = Tcl_GetStringFromObj(elt, &strEltLen);
 	type = TclGetPathType(elt, &fsPtr, &driveNameLength, &driveName);
 	if (type != TCL_PATH_RELATIVE) {