Filesystem: Export most generic path eval function

Add path length parameter to
rtems_filesystem_eval_path_start_with_root_and_current() so that users
may pass paths without a '\0' termination.

Update #2558.

cpukit/libcsupport/include/rtems/libio_.h

@@ -328,6 +328,7 @@ rtems_filesystem_location_info_t *
 rtems_filesystem_eval_path_start_with_root_and_current(
   rtems_filesystem_eval_path_context_t *ctx,
   const char *path,
+  size_t pathlen,
   int eval_flags,
   rtems_filesystem_global_location_t *const *global_root_ptr,
   rtems_filesystem_global_location_t *const *global_current_ptr

cpukit/libcsupport/src/chroot.c

@@ -44,6 +44,7 @@ int chroot( const char *path )
   rtems_filesystem_eval_path_start_with_root_and_current(
     &ctx,
     path,
+    strlen( path ),
     eval_flags,
     &rtems_global_user_env.root_directory,
     &rtems_global_user_env.current_directory

cpukit/libcsupport/src/sup_fs_eval_path.c

@@ -136,8 +136,8 @@ void rtems_filesystem_eval_path_continue(
   }
 }
 
-static rtems_filesystem_location_info_t *
+rtems_filesystem_location_info_t *
-eval_path_start(
+rtems_filesystem_eval_path_start_with_root_and_current(
   rtems_filesystem_eval_path_context_t *ctx,
   const char *path,
   size_t pathlen,
@@ -166,25 +166,6 @@ eval_path_start(
   return &ctx->currentloc;
 }
 
-rtems_filesystem_location_info_t *
-rtems_filesystem_eval_path_start_with_root_and_current(
-  rtems_filesystem_eval_path_context_t *ctx,
-  const char *path,
-  int eval_flags,
-  rtems_filesystem_global_location_t *const *global_root_ptr,
-  rtems_filesystem_global_location_t *const *global_current_ptr
-)
-{
-  return eval_path_start(
-    ctx,
-    path,
-    strlen(path),
-    eval_flags,
-    global_root_ptr,
-    global_current_ptr
-  );
-}
-
 rtems_filesystem_location_info_t *
 rtems_filesystem_eval_path_start(
   rtems_filesystem_eval_path_context_t *ctx,
@@ -195,6 +176,7 @@ rtems_filesystem_eval_path_start(
   return rtems_filesystem_eval_path_start_with_root_and_current(
     ctx,
     path,
+    strlen(path),
     eval_flags,
     &rtems_filesystem_root,
     &rtems_filesystem_current
@@ -229,7 +211,7 @@ rtems_filesystem_eval_path_start_with_parent(
     }
   }
 
-  currentloc = eval_path_start(
+  currentloc = rtems_filesystem_eval_path_start_with_root_and_current(
     ctx,
     parentpath,
     parentpathlen,