--- a/src/physfs.c	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/physfs.c	Wed Mar 21 23:59:43 2012 -0400
@@ -1382,6 +1382,7 @@
     const char dirsep = __PHYSFS_platformDirSeparator;
     PHYSFS_Stat statbuf;
     char *ptr = NULL;
+    char *endstr = NULL;
     int exists = 0;
 
     BAIL_IF_MACRO(!initialized, PHYSFS_ERR_NOT_INITIALIZED, 0);
@@ -1394,22 +1395,29 @@
     prefDir = __PHYSFS_platformCalcPrefDir(org, app);
     BAIL_IF_MACRO(!prefDir, ERRPASS, NULL);
 
-    if (__PHYSFS_platformStat(prefDir, &exists, &statbuf))
-        return prefDir;
-
-    for (ptr = strchr(prefDir, dirsep); ptr; ptr = strchr(ptr+1, dirsep))
+    assert(strlen(prefDir) > 0);
+    endstr = prefDir + (strlen(prefDir) - 1);
+    assert(*endstr == dirsep);
+    *endstr = '\0';  /* mask out the final dirsep for now. */
+
+    if (!__PHYSFS_platformStat(prefDir, &exists, &statbuf))
     {
-        *ptr = '\0';
-        __PHYSFS_platformMkDir(prefDir);
-        *ptr = dirsep;
-    } /* for */
-
-    if (!__PHYSFS_platformMkDir(prefDir))
-    {
-        allocator.Free(prefDir);
-        prefDir = NULL;
+        for (ptr = strchr(prefDir, dirsep); ptr; ptr = strchr(ptr+1, dirsep))
+        {
+            *ptr = '\0';
+            __PHYSFS_platformMkDir(prefDir);
+            *ptr = dirsep;
+        } /* for */
+
+        if (!__PHYSFS_platformMkDir(prefDir))
+        {
+            allocator.Free(prefDir);
+            prefDir = NULL;
+        } /* if */
     } /* if */
 
+    *endstr = dirsep;  /* readd the final dirsep. */
+
     return prefDir;
 } /* PHYSFS_getPrefDir */
 

--- a/src/physfs_internal.h	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/physfs_internal.h	Wed Mar 21 23:59:43 2012 -0400
@@ -645,8 +645,9 @@
 const char *__PHYSFS_getUserDir(void);  /* not deprecated internal version. */
 
 /*
- * Get the platform-specific pref dir.
- *  Caller will allocator.Free() the retval if it's not NULL. If it's NULL,
+ * Get the platform-specific pref dir. You must make sure the string ends
+ *  with a dir separator.
+ * Caller will allocator.Free() the retval if it's not NULL. If it's NULL,
  *  it's a total failure. Caller will make missing directories if necessary;
  *  this just reports the final path.
  */

--- a/src/platform_beos.cpp	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/platform_beos.cpp	Wed Mar 21 23:59:43 2012 -0400
@@ -188,10 +188,10 @@
     /* !!! FIXME: there's a real API to determine this */
     const char *userdir = __PHYSFS_getUserDir();
     const char *append = "config/settings/";
-    const size_t len = strlen(userdir) + strlen(append) + strlen(app) + 1;
+    const size_t len = strlen(userdir) + strlen(append) + strlen(app) + 2;
     char *retval = allocator.Malloc(len);
     BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
-    snprintf(retval, len, "%s%s%s", userdir, append, app);
+    snprintf(retval, len, "%s%s%s/", userdir, append, app);
     return retval;
 } /* __PHYSFS_platformCalcPrefDir */
 

--- a/src/platform_macosx.c	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/platform_macosx.c	Wed Mar 21 23:59:43 2012 -0400
@@ -294,10 +294,10 @@
     /* !!! FIXME: there's a real API to determine this */
     const char *userdir = __PHYSFS_getUserDir();
     const char *append = "Library/Application Support/";
-    const size_t len = strlen(userdir) + strlen(append) + strlen(app) + 1;
+    const size_t len = strlen(userdir) + strlen(append) + strlen(app) + 2;
     char *retval = allocator.Malloc(len);
     BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
-    snprintf(retval, len, "%s%s%s", userdir, append, app);
+    snprintf(retval, len, "%s%s%s/", userdir, append, app);
     return retval;
 } /* __PHYSFS_platformCalcPrefDir */
 

--- a/src/platform_unix.c	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/platform_unix.c	Wed Mar 21 23:59:43 2012 -0400
@@ -315,10 +315,10 @@
         append = ".local/share/";
     } /* if */
 
-    len = strlen(envr) + strlen(append) + strlen(app) + 1;
+    len = strlen(envr) + strlen(append) + strlen(app) + 2;
     retval = (char *) allocator.Malloc(len);
     BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
-    snprintf(retval, len, "%s%s%s", envr, append, app);
+    snprintf(retval, len, "%s%s%s/", envr, append, app);
     return retval;
 } /* __PHYSFS_platformCalcPrefDir */
 

--- a/src/platform_windows.c	Wed Mar 21 23:52:44 2012 -0400
+++ b/src/platform_windows.c	Wed Mar 21 23:59:43 2012 -0400
@@ -462,7 +462,7 @@
 
     utf8 = unicodeToUtf8Heap(path);
     BAIL_IF_MACRO(!utf8, ERRPASS, NULL);
-    len = strlen(utf8) + strlen(org) + strlen(app) + 3;
+    len = strlen(utf8) + strlen(org) + strlen(app) + 4;
     retval = allocator.Malloc(len);
     if (!retval)
     {
@@ -470,7 +470,7 @@
         BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
     } /* if */
 
-    sprintf(retval, "%s\\%s\\%s", utf8, org, app);
+    sprintf(retval, "%s\\%s\\%s\\", utf8, org, app);
     return retval;
 } /* __PHYSFS_platformCalcPrefDir */