s/0/NULL/ for function pointers; comments, formatting.

35 files changed, 559 insertions, 436 deletions

diff --git a/src/autofit/afcjk.c b/src/autofit/afcjk.c
index 4823c1d7f..412663315 100644
--- a/src/autofit/afcjk.c
+++ b/src/autofit/afcjk.c
@@ -2351,13 +2351,13 @@
 
     sizeof ( AF_CJKMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init,
-    (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths,
+    (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init,        /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale,       /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL,                       /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   af_cjk_hints_init,
-    (AF_WritingSystem_ApplyHintsFunc)  af_cjk_hints_apply
+    (AF_WritingSystem_InitHintsFunc)   af_cjk_hints_init,          /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  af_cjk_hints_apply          /* style_hints_apply     */
   )
 
 
@@ -2371,13 +2371,13 @@
 
     sizeof ( AF_CJKMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) NULL,
-    (AF_WritingSystem_ScaleMetricsFunc)NULL,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)NULL,
+    (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   NULL,
-    (AF_WritingSystem_ApplyHintsFunc)  NULL
+    (AF_WritingSystem_InitHintsFunc)   NULL, /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  NULL  /* style_hints_apply     */
   )
 
 
diff --git a/src/autofit/afdummy.c b/src/autofit/afdummy.c
index f3960c85f..ff47dcb0c 100644
--- a/src/autofit/afdummy.c
+++ b/src/autofit/afdummy.c
@@ -62,13 +62,13 @@
 
     sizeof ( AF_StyleMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) NULL,
-    (AF_WritingSystem_ScaleMetricsFunc)NULL,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)NULL,
+    (AF_WritingSystem_InitMetricsFunc) NULL,                /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)NULL,                /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL,                /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)NULL,                /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   af_dummy_hints_init,
-    (AF_WritingSystem_ApplyHintsFunc)  af_dummy_hints_apply
+    (AF_WritingSystem_InitHintsFunc)   af_dummy_hints_init, /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  af_dummy_hints_apply /* style_hints_apply     */
   )
 
 
diff --git a/src/autofit/afindic.c b/src/autofit/afindic.c
index 097a2b299..cfaf7196d 100644
--- a/src/autofit/afindic.c
+++ b/src/autofit/afindic.c
@@ -121,13 +121,13 @@
 
     sizeof ( AF_CJKMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) af_indic_metrics_init,
-    (AF_WritingSystem_ScaleMetricsFunc)af_indic_metrics_scale,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)af_indic_get_standard_widths,
+    (AF_WritingSystem_InitMetricsFunc) af_indic_metrics_init,        /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)af_indic_metrics_scale,       /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL,                         /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)af_indic_get_standard_widths, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   af_indic_hints_init,
-    (AF_WritingSystem_ApplyHintsFunc)  af_indic_hints_apply
+    (AF_WritingSystem_InitHintsFunc)   af_indic_hints_init,          /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  af_indic_hints_apply          /* style_hints_apply     */
   )
 
 
@@ -141,13 +141,13 @@
 
     sizeof ( AF_CJKMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) NULL,
-    (AF_WritingSystem_ScaleMetricsFunc)NULL,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)NULL,
+    (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   NULL,
-    (AF_WritingSystem_ApplyHintsFunc)  NULL
+    (AF_WritingSystem_InitHintsFunc)   NULL, /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  NULL  /* style_hints_apply     */
   )
 
 
diff --git a/src/autofit/aflatin.c b/src/autofit/aflatin.c
index db7aaff7b..141e6591f 100644
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -3477,13 +3477,13 @@
 
     sizeof ( AF_LatinMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) af_latin_metrics_init,
-    (AF_WritingSystem_ScaleMetricsFunc)af_latin_metrics_scale,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)af_latin_get_standard_widths,
+    (AF_WritingSystem_InitMetricsFunc) af_latin_metrics_init,        /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)af_latin_metrics_scale,       /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL,                         /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)af_latin_get_standard_widths, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   af_latin_hints_init,
-    (AF_WritingSystem_ApplyHintsFunc)  af_latin_hints_apply
+    (AF_WritingSystem_InitHintsFunc)   af_latin_hints_init,          /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  af_latin_hints_apply          /* style_hints_apply     */
   )
 
 
diff --git a/src/autofit/aflatin2.c b/src/autofit/aflatin2.c
index 5db4a4114..5cc5eb757 100644
--- a/src/autofit/aflatin2.c
+++ b/src/autofit/aflatin2.c
@@ -2410,13 +2410,13 @@
 
     sizeof ( AF_LatinMetricsRec ),
 
-    (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init,
-    (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale,
-    (AF_WritingSystem_DoneMetricsFunc) NULL,
-    (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths,
+    (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init,        /* style_metrics_init    */
+    (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale,       /* style_metrics_scale   */
+    (AF_WritingSystem_DoneMetricsFunc) NULL,                          /* style_metrics_done    */
+    (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, /* style_metrics_getstdw */
 
-    (AF_WritingSystem_InitHintsFunc)   af_latin2_hints_init,
-    (AF_WritingSystem_ApplyHintsFunc)  af_latin2_hints_apply
+    (AF_WritingSystem_InitHintsFunc)   af_latin2_hints_init,          /* style_hints_init      */
+    (AF_WritingSystem_ApplyHintsFunc)  af_latin2_hints_apply          /* style_hints_apply     */
   )
 
 
diff --git a/src/autofit/afmodule.c b/src/autofit/afmodule.c
index e8f8ff407..681501b01 100644
--- a/src/autofit/afmodule.c
+++ b/src/autofit/afmodule.c
@@ -421,12 +421,14 @@
 
   FT_DEFINE_SERVICE_PROPERTIESREC(
     af_service_properties,
+
     (FT_Properties_SetFunc)af_property_set,        /* set_property */
     (FT_Properties_GetFunc)af_property_get )       /* get_property */
 
 
   FT_DEFINE_SERVICEDESCREC1(
     af_services,
+
     FT_SERVICE_ID_PROPERTIES, &AF_SERVICE_PROPERTIES_GET )
 
 
@@ -552,6 +554,7 @@
 
   FT_DEFINE_AUTOHINTER_INTERFACE(
     af_autofitter_interface,
+
     NULL,                                                    /* reset_face */
     NULL,                                              /* get_global_hints */
     NULL,                                             /* done_global_hints */
@@ -570,9 +573,10 @@
 
     (const void*)&AF_INTERFACE_GET,
 
-    (FT_Module_Constructor)af_autofitter_init,
-    (FT_Module_Destructor) af_autofitter_done,
-    (FT_Module_Requester)  af_get_interface )
+    (FT_Module_Constructor)af_autofitter_init,  /* module_init   */
+    (FT_Module_Destructor) af_autofitter_done,  /* module_done   */
+    (FT_Module_Requester)  af_get_interface     /* get_interface */
+  )
 
 
 /* END */
diff --git a/src/base/ftbbox.c b/src/base/ftbbox.c
index d3e45ffa0..804dc9058 100644
--- a/src/base/ftbbox.c
+++ b/src/base/ftbbox.c
@@ -423,12 +423,15 @@
   }
 
 
-  FT_DEFINE_OUTLINE_FUNCS(bbox_interface,
-    (FT_Outline_MoveTo_Func) BBox_Move_To,
-    (FT_Outline_LineTo_Func) BBox_Line_To,
-    (FT_Outline_ConicTo_Func)BBox_Conic_To,
-    (FT_Outline_CubicTo_Func)BBox_Cubic_To,
-    0, 0
+  FT_DEFINE_OUTLINE_FUNCS(
+    bbox_interface,
+
+    (FT_Outline_MoveTo_Func) BBox_Move_To,   /* move_to  */
+    (FT_Outline_LineTo_Func) BBox_Line_To,   /* line_to  */
+    (FT_Outline_ConicTo_Func)BBox_Conic_To,  /* conic_to */
+    (FT_Outline_CubicTo_Func)BBox_Cubic_To,  /* cubic_to */
+    0,                                       /* shift    */
+    0                                        /* delta    */
   )
 
 
@@ -457,6 +460,7 @@
     {
       abbox->xMin = abbox->xMax = 0;
       abbox->yMin = abbox->yMax = 0;
+
       return 0;
     }
 
@@ -468,10 +472,10 @@
 
     for ( n = 0; n < outline->n_points; n++ )
     {
-      FT_UPDATE_BBOX( vec, cbox);
+      FT_UPDATE_BBOX( vec, cbox );
 
       if ( FT_CURVE_TAG( outline->tags[n] ) == FT_CURVE_TAG_ON )
-        FT_UPDATE_BBOX( vec, bbox);
+        FT_UPDATE_BBOX( vec, bbox );
 
       vec++;
     }
@@ -487,8 +491,10 @@
       TBBox_Rec  user;
 
 #ifdef FT_CONFIG_OPTION_PIC
-      FT_Outline_Funcs bbox_interface;
-      Init_Class_bbox_interface(&bbox_interface);
+      FT_Outline_Funcs  bbox_interface;
+
+
+      Init_Class_bbox_interface( &bbox_interface );
 #endif
 
       user.bbox = bbox;
diff --git a/src/base/ftglyph.c b/src/base/ftglyph.c
index c2376dd03..dd0f025ab 100644
--- a/src/base/ftglyph.c
+++ b/src/base/ftglyph.c
@@ -132,16 +132,18 @@
   }
 
 
-  FT_DEFINE_GLYPH(ft_bitmap_glyph_class,
+  FT_DEFINE_GLYPH(
+    ft_bitmap_glyph_class,
+
     sizeof ( FT_BitmapGlyphRec ),
     FT_GLYPH_FORMAT_BITMAP,
 
-    ft_bitmap_glyph_init,
-    ft_bitmap_glyph_done,
-    ft_bitmap_glyph_copy,
-    0,                          /* FT_Glyph_TransformFunc */
-    ft_bitmap_glyph_bbox,
-    0                           /* FT_Glyph_PrepareFunc   */
+    ft_bitmap_glyph_init,    /* FT_Glyph_InitFunc       glyph_init      */
+    ft_bitmap_glyph_done,    /* FT_Glyph_DoneFunc       glyph_done      */
+    ft_bitmap_glyph_copy,    /* FT_Glyph_CopyFunc       glyph_copy      */
+    NULL,                    /* FT_Glyph_TransformFunc  glyph_transform */
+    ft_bitmap_glyph_bbox,    /* FT_Glyph_GetBBoxFunc    glyph_bbox      */
+    NULL                     /* FT_Glyph_PrepareFunc    glyph_prepare   */
   )
 
 
@@ -260,16 +262,18 @@
   }
 
 
-  FT_DEFINE_GLYPH( ft_outline_glyph_class,
+  FT_DEFINE_GLYPH(
+    ft_outline_glyph_class,
+
     sizeof ( FT_OutlineGlyphRec ),
     FT_GLYPH_FORMAT_OUTLINE,
 
-    ft_outline_glyph_init,
-    ft_outline_glyph_done,
-    ft_outline_glyph_copy,
-    ft_outline_glyph_transform,
-    ft_outline_glyph_bbox,
-    ft_outline_glyph_prepare
+    ft_outline_glyph_init,      /* FT_Glyph_InitFunc       glyph_init      */
+    ft_outline_glyph_done,      /* FT_Glyph_DoneFunc       glyph_done      */
+    ft_outline_glyph_copy,      /* FT_Glyph_CopyFunc       glyph_copy      */
+    ft_outline_glyph_transform, /* FT_Glyph_TransformFunc  glyph_transform */
+    ft_outline_glyph_bbox,      /* FT_Glyph_GetBBoxFunc    glyph_bbox      */
+    ft_outline_glyph_prepare    /* FT_Glyph_PrepareFunc    glyph_prepare   */
   )
 
 
diff --git a/src/bdf/bdfdrivr.c b/src/bdf/bdfdrivr.c
index a381cf68f..e9cb10828 100644
--- a/src/bdf/bdfdrivr.c
+++ b/src/bdf/bdfdrivr.c
@@ -866,10 +866,10 @@ THE SOFTWARE.
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
-      0,                        /* FT_Module_Constructor  module_init   */
-      0,                        /* FT_Module_Destructor   module_done   */
+      NULL,                     /* FT_Module_Constructor  module_init   */
+      NULL,                     /* FT_Module_Destructor   module_done   */
       bdf_driver_requester      /* FT_Module_Requester    get_interface */
     },
 
@@ -879,16 +879,16 @@ THE SOFTWARE.
 
     BDF_Face_Init,              /* FT_Face_InitFunc  init_face */
     BDF_Face_Done,              /* FT_Face_DoneFunc  done_face */
-    0,                          /* FT_Size_InitFunc  init_size */
-    0,                          /* FT_Size_DoneFunc  done_size */
-    0,                          /* FT_Slot_InitFunc  init_slot */
-    0,                          /* FT_Slot_DoneFunc  done_slot */
+    NULL,                       /* FT_Size_InitFunc  init_size */
+    NULL,                       /* FT_Size_DoneFunc  done_size */
+    NULL,                       /* FT_Slot_InitFunc  init_slot */
+    NULL,                       /* FT_Slot_DoneFunc  done_slot */
 
     BDF_Glyph_Load,             /* FT_Slot_LoadFunc  load_glyph */
 
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
     BDF_Size_Request,           /* FT_Size_RequestFunc  request_size */
     BDF_Size_Select             /* FT_Size_SelectFunc   select_size  */
diff --git a/src/cache/ftcbasic.c b/src/cache/ftcbasic.c
index 8e6de8c41..fc8905c95 100644
--- a/src/cache/ftcbasic.c
+++ b/src/cache/ftcbasic.c
@@ -237,12 +237,14 @@
   {
     {
       sizeof ( FTC_BasicFamilyRec ),
-      ftc_basic_family_compare,
-      ftc_basic_family_init,
-      0,                        /* FTC_MruNode_ResetFunc */
-      0                         /* FTC_MruNode_DoneFunc  */
+
+      ftc_basic_family_compare, /* FTC_MruNode_CompareFunc  node_compare */
+      ftc_basic_family_init,    /* FTC_MruNode_InitFunc     node_init    */
+      NULL,                     /* FTC_MruNode_ResetFunc    node_reset   */
+      NULL                      /* FTC_MruNode_DoneFunc     node_done    */
     },
-    ftc_basic_family_load_glyph
+
+    ftc_basic_family_load_glyph /* FTC_IFamily_LoadGlyphFunc  family_load_glyph */
   };
 
 
@@ -250,16 +252,17 @@
   const FTC_GCacheClassRec  ftc_basic_image_cache_class =
   {
     {
-      ftc_inode_new,
-      ftc_inode_weight,
-      ftc_gnode_compare,
-      ftc_basic_gnode_compare_faceid,
-      ftc_inode_free,
+      ftc_inode_new,                  /* FTC_Node_NewFunc      node_new           */
+      ftc_inode_weight,               /* FTC_Node_WeightFunc   node_weight        */
+      ftc_gnode_compare,              /* FTC_Node_CompareFunc  node_compare       */
+      ftc_basic_gnode_compare_faceid, /* FTC_Node_CompareFunc  node_remove_faceid */
+      ftc_inode_free,                 /* FTC_Node_FreeFunc     node_free          */
 
       sizeof ( FTC_GCacheRec ),
-      ftc_gcache_init,
-      ftc_gcache_done
+      ftc_gcache_init,                /* FTC_Cache_InitFunc    cache_init         */
+      ftc_gcache_done                 /* FTC_Cache_DoneFunc    cache_done         */
     },
+
     (FTC_MruListClass)&ftc_basic_image_family_class
   };
 
@@ -419,11 +422,12 @@
   {
     {
       sizeof ( FTC_BasicFamilyRec ),
-      ftc_basic_family_compare,
-      ftc_basic_family_init,
-      0,                            /* FTC_MruNode_ResetFunc */
-      0                             /* FTC_MruNode_DoneFunc  */
+      ftc_basic_family_compare,     /* FTC_MruNode_CompareFunc  node_compare */
+      ftc_basic_family_init,        /* FTC_MruNode_InitFunc     node_init    */
+      NULL,                         /* FTC_MruNode_ResetFunc    node_reset   */
+      NULL                          /* FTC_MruNode_DoneFunc     node_done    */
     },
+
     ftc_basic_family_get_count,
     ftc_basic_family_load_bitmap
   };
@@ -433,16 +437,17 @@
   const FTC_GCacheClassRec  ftc_basic_sbit_cache_class =
   {
     {
-      ftc_snode_new,
-      ftc_snode_weight,
-      ftc_snode_compare,
-      ftc_basic_gnode_compare_faceid,
-      ftc_snode_free,
+      ftc_snode_new,                  /* FTC_Node_NewFunc      node_new           */
+      ftc_snode_weight,               /* FTC_Node_WeightFunc   node_weight        */
+      ftc_snode_compare,              /* FTC_Node_CompareFunc  node_compare       */
+      ftc_basic_gnode_compare_faceid, /* FTC_Node_CompareFunc  node_remove_faceid */
+      ftc_snode_free,                 /* FTC_Node_FreeFunc     node_free          */
 
       sizeof ( FTC_GCacheRec ),
-      ftc_gcache_init,
-      ftc_gcache_done
+      ftc_gcache_init,                /* FTC_Cache_InitFunc    cache_init         */
+      ftc_gcache_done                 /* FTC_Cache_DoneFunc    cache_done         */
     },
+
     (FTC_MruListClass)&ftc_basic_sbit_family_class
   };
 
diff --git a/src/cache/ftccmap.c b/src/cache/ftccmap.c
index 41a0ce97d..f0a85f9c5 100644
--- a/src/cache/ftccmap.c
+++ b/src/cache/ftccmap.c
@@ -201,15 +201,15 @@
   static
   const FTC_CacheClassRec  ftc_cmap_cache_class =
   {
-    ftc_cmap_node_new,
-    ftc_cmap_node_weight,
-    ftc_cmap_node_compare,
-    ftc_cmap_node_remove_faceid,
-    ftc_cmap_node_free,
+    ftc_cmap_node_new,           /* FTC_Node_NewFunc      node_new           */
+    ftc_cmap_node_weight,        /* FTC_Node_WeightFunc   node_weight        */
+    ftc_cmap_node_compare,       /* FTC_Node_CompareFunc  node_compare       */
+    ftc_cmap_node_remove_faceid, /* FTC_Node_CompareFunc  node_remove_faceid */
+    ftc_cmap_node_free,          /* FTC_Node_FreeFunc     node_free          */
 
     sizeof ( FTC_CacheRec ),
-    ftc_cache_init,
-    ftc_cache_done,
+    ftc_cache_init,              /* FTC_Cache_InitFunc    cache_init         */
+    ftc_cache_done,              /* FTC_Cache_DoneFunc    cache_done         */
   };
 
 
diff --git a/src/cache/ftcmanag.c b/src/cache/ftcmanag.c
index 661a32af5..507c6053e 100644
--- a/src/cache/ftcmanag.c
+++ b/src/cache/ftcmanag.c
@@ -156,10 +156,11 @@
   const FTC_MruListClassRec  ftc_size_list_class =
   {
     sizeof ( FTC_SizeNodeRec ),
-    ftc_size_node_compare,
-    ftc_size_node_init,
-    ftc_size_node_reset,
-    ftc_size_node_done
+
+    ftc_size_node_compare,  /* FTC_MruNode_CompareFunc  node_compare */
+    ftc_size_node_init,     /* FTC_MruNode_InitFunc     node_init    */
+    ftc_size_node_reset,    /* FTC_MruNode_ResetFunc    node_reset   */
+    ftc_size_node_done      /* FTC_MruNode_DoneFunc     node_done    */
   };
 
 
@@ -296,10 +297,10 @@
   {
     sizeof ( FTC_FaceNodeRec),
 
-    ftc_face_node_compare,
-    ftc_face_node_init,
-    0,                          /* FTC_MruNode_ResetFunc */
-    ftc_face_node_done
+    ftc_face_node_compare,  /* FTC_MruNode_CompareFunc  node_compare */
+    ftc_face_node_init,     /* FTC_MruNode_InitFunc     node_init    */
+    NULL,                   /* FTC_MruNode_ResetFunc    node_reset   */
+    ftc_face_node_done      /* FTC_MruNode_DoneFunc     node_done    */
   };
 
 
diff --git a/src/cache/ftcmru.h b/src/cache/ftcmru.h
index ae3c4ce23..27ad55aa0 100644
--- a/src/cache/ftcmru.h
+++ b/src/cache/ftcmru.h
@@ -108,6 +108,7 @@ FT_BEGIN_HEADER
   typedef struct  FTC_MruListClassRec_
   {
     FT_Offset                node_size;
+
     FTC_MruNode_CompareFunc  node_compare;
     FTC_MruNode_InitFunc     node_init;
     FTC_MruNode_ResetFunc    node_reset;
@@ -115,6 +116,7 @@ FT_BEGIN_HEADER
 
   } FTC_MruListClassRec;
 
+
   typedef struct  FTC_MruListRec_
   {
     FT_UInt              num_nodes;
diff --git a/src/cff/cffcmap.c b/src/cff/cffcmap.c
index 3ef48328c..695ba69d9 100644
--- a/src/cff/cffcmap.c
+++ b/src/cff/cffcmap.c
@@ -104,15 +104,21 @@
   }
 
 
-  FT_DEFINE_CMAP_CLASS(cff_cmap_encoding_class_rec,
+  FT_DEFINE_CMAP_CLASS(
+    cff_cmap_encoding_class_rec,
+
     sizeof ( CFF_CMapStdRec ),
 
-    (FT_CMap_InitFunc)     cff_cmap_encoding_init,
-    (FT_CMap_DoneFunc)     cff_cmap_encoding_done,
-    (FT_CMap_CharIndexFunc)cff_cmap_encoding_char_index,
-    (FT_CMap_CharNextFunc) cff_cmap_encoding_char_next,
+    (FT_CMap_InitFunc)     cff_cmap_encoding_init,        /* init       */
+    (FT_CMap_DoneFunc)     cff_cmap_encoding_done,        /* done       */
+    (FT_CMap_CharIndexFunc)cff_cmap_encoding_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) cff_cmap_encoding_char_next,   /* char_next  */
 
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   )
 
 
@@ -202,15 +208,22 @@
   }
 
 
-  FT_DEFINE_CMAP_CLASS(cff_cmap_unicode_class_rec,
+  FT_DEFINE_CMAP_CLASS(
+    cff_cmap_unicode_class_rec,
+
     sizeof ( PS_UnicodesRec ),
 
-    (FT_CMap_InitFunc)     cff_cmap_unicode_init,
-    (FT_CMap_DoneFunc)     cff_cmap_unicode_done,
-    (FT_CMap_CharIndexFunc)cff_cmap_unicode_char_index,
-    (FT_CMap_CharNextFunc) cff_cmap_unicode_char_next,
+    (FT_CMap_InitFunc)     cff_cmap_unicode_init,        /* init       */
+    (FT_CMap_DoneFunc)     cff_cmap_unicode_done,        /* done       */
+    (FT_CMap_CharIndexFunc)cff_cmap_unicode_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) cff_cmap_unicode_char_next,   /* char_next  */
 
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   )
 
+
 /* END */
diff --git a/src/cff/cffdrivr.c b/src/cff/cffdrivr.c
index 67bf09d8c..1d8d12e7b 100644
--- a/src/cff/cffdrivr.c
+++ b/src/cff/cffdrivr.c
@@ -358,6 +358,7 @@
 
   FT_DEFINE_SERVICE_GLYPHDICTREC(
     cff_service_glyph_dict,
+
     (FT_GlyphDict_GetNameFunc)  cff_get_glyph_name,      /* get_name   */
     (FT_GlyphDict_NameIndexFunc)cff_get_name_index       /* name_index */
   )
@@ -421,6 +422,7 @@
 
   FT_DEFINE_SERVICE_PSINFOREC(
     cff_service_ps_info,
+
     (PS_GetFontInfoFunc)   cff_ps_get_font_info,    /* ps_get_font_info    */
     (PS_GetFontExtraFunc)  NULL,                    /* ps_get_font_extra   */
     (PS_HasGlyphNamesFunc) cff_ps_has_glyph_names,  /* ps_has_glyph_names  */
@@ -466,6 +468,7 @@
 
   FT_DEFINE_SERVICE_PSFONTNAMEREC(
     cff_service_ps_name,
+
     (FT_PsName_GetFunc)cff_get_ps_name      /* get_ps_font_name */
   )
 
@@ -513,6 +516,7 @@
 
   FT_DEFINE_SERVICE_TTCMAPSREC(
     cff_service_get_cmap_info,
+
     (TT_CMap_Info_GetFunc)cff_get_cmap_info    /* get_cmap_info */
   )
 
@@ -643,6 +647,7 @@
 
   FT_DEFINE_SERVICE_CIDREC(
     cff_service_cid_info,
+
     (FT_CID_GetRegistryOrderingSupplementFunc)
       cff_get_ros,                             /* get_ros                  */
     (FT_CID_GetIsInternallyCIDKeyedFunc)
@@ -855,6 +860,7 @@
 
   FT_DEFINE_SERVICE_PROPERTIESREC(
     cff_service_properties,
+
     (FT_Properties_SetFunc)cff_property_set,      /* set_property */
     (FT_Properties_GetFunc)cff_property_get )     /* get_property */
 
@@ -874,6 +880,7 @@
 #ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES
   FT_DEFINE_SERVICEDESCREC7(
     cff_services,
+
     FT_SERVICE_ID_FONT_FORMAT,          FT_FONT_FORMAT_CFF,
     FT_SERVICE_ID_POSTSCRIPT_INFO,      &CFF_SERVICE_PS_INFO_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &CFF_SERVICE_PS_NAME_GET,
@@ -885,6 +892,7 @@
 #else
   FT_DEFINE_SERVICEDESCREC6(
     cff_services,
+
     FT_SERVICE_ID_FONT_FORMAT,          FT_FONT_FORMAT_CFF,
     FT_SERVICE_ID_POSTSCRIPT_INFO,      &CFF_SERVICE_PS_INFO_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &CFF_SERVICE_PS_NAME_GET,
@@ -954,7 +962,7 @@
       0x10000L,
       0x20000L,
 
-      0,   /* module-specific interface */
+      NULL,   /* module-specific interface */
 
       cff_driver_init,          /* FT_Module_Constructor  module_init   */
       cff_driver_done,          /* FT_Module_Destructor   module_done   */
@@ -974,7 +982,7 @@
     cff_glyph_load,             /* FT_Slot_LoadFunc  load_glyph */
 
     cff_get_kerning,            /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
     cff_get_advances,           /* FT_Face_GetAdvancesFunc  get_advances */
 
     cff_size_request,           /* FT_Size_RequestFunc  request_size */
diff --git a/src/cid/cidriver.c b/src/cid/cidriver.c
index 64141ab6b..257365681 100644
--- a/src/cid/cidriver.c
+++ b/src/cid/cidriver.c
@@ -206,7 +206,7 @@
       0x10000L,  /* version 1.0 of driver */
       0x20000L,  /* requires FreeType 2.0 */
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
       cid_driver_init,          /* FT_Module_Constructor  module_init   */
       cid_driver_done,          /* FT_Module_Destructor   module_done   */
@@ -226,12 +226,12 @@
 
     cid_slot_load_glyph,        /* FT_Slot_LoadFunc  load_glyph */
 
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
     cid_size_request,           /* FT_Size_RequestFunc  request_size */
-    0                           /* FT_Size_SelectFunc   select_size  */
+    NULL                        /* FT_Size_SelectFunc   select_size  */
   };
 
 
diff --git a/src/gxvalid/gxvmod.c b/src/gxvalid/gxvmod.c
index e589a7fb7..32fd84e14 100644
--- a/src/gxvalid/gxvmod.c
+++ b/src/gxvalid/gxvmod.c
@@ -274,11 +274,11 @@
     0x10000L,
     0x20000L,
 
-    0,              /* module-specific interface */
+    NULL,              /* module-specific interface */
 
-    (FT_Module_Constructor)0,
-    (FT_Module_Destructor) 0,
-    (FT_Module_Requester)  gxvalid_get_service
+    (FT_Module_Constructor)NULL,                /* module_init   */
+    (FT_Module_Destructor) NULL,                /* module_done   */
+    (FT_Module_Requester)  gxvalid_get_service  /* get_interface */
   };
 
 
diff --git a/src/otvalid/otvmod.c b/src/otvalid/otvmod.c
index 972bd1baa..aed5e9c6f 100644
--- a/src/otvalid/otvmod.c
+++ b/src/otvalid/otvmod.c
@@ -271,11 +271,11 @@
     0x10000L,
     0x20000L,
 
-    0,              /* module-specific interface */
+    NULL,              /* module-specific interface */
 
-    (FT_Module_Constructor)0,
-    (FT_Module_Destructor) 0,
-    (FT_Module_Requester)  otvalid_get_service
+    (FT_Module_Constructor)NULL,                /* module_init   */
+    (FT_Module_Destructor) NULL,                /* module_done   */
+    (FT_Module_Requester)  otvalid_get_service  /* get_interface */
   };
 
 
diff --git a/src/pcf/pcfdrivr.c b/src/pcf/pcfdrivr.c
index 0996d1079..a0db8070f 100644
--- a/src/pcf/pcfdrivr.c
+++ b/src/pcf/pcfdrivr.c
@@ -700,10 +700,10 @@ THE SOFTWARE.
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
-      0,                        /* FT_Module_Constructor  module_init   */
-      0,                        /* FT_Module_Destructor   module_done   */
+      NULL,                     /* FT_Module_Constructor  module_init   */
+      NULL,                     /* FT_Module_Destructor   module_done   */
       pcf_driver_requester      /* FT_Module_Requester    get_interface */
     },
 
@@ -713,16 +713,16 @@ THE SOFTWARE.
 
     PCF_Face_Init,              /* FT_Face_InitFunc  init_face */
     PCF_Face_Done,              /* FT_Face_DoneFunc  done_face */
-    0,                          /* FT_Size_InitFunc  init_size */
-    0,                          /* FT_Size_DoneFunc  done_size */
-    0,                          /* FT_Slot_InitFunc  init_slot */
-    0,                          /* FT_Slot_DoneFunc  done_slot */
+    NULL,                       /* FT_Size_InitFunc  init_size */
+    NULL,                       /* FT_Size_DoneFunc  done_size */
+    NULL,                       /* FT_Slot_InitFunc  init_slot */
+    NULL,                       /* FT_Slot_DoneFunc  done_slot */
 
     PCF_Glyph_Load,             /* FT_Slot_LoadFunc  load_glyph */
 
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
     PCF_Size_Request,           /* FT_Size_RequestFunc  request_size */
     PCF_Size_Select             /* FT_Size_SelectFunc   select_size  */
diff --git a/src/pfr/pfrcmap.c b/src/pfr/pfrcmap.c
index a1439c2e9..f1f9c53b9 100644
--- a/src/pfr/pfrcmap.c
+++ b/src/pfr/pfrcmap.c
@@ -161,12 +161,16 @@
   {
     sizeof ( PFR_CMapRec ),
 
-    (FT_CMap_InitFunc)     pfr_cmap_init,
-    (FT_CMap_DoneFunc)     pfr_cmap_done,
-    (FT_CMap_CharIndexFunc)pfr_cmap_char_index,
-    (FT_CMap_CharNextFunc) pfr_cmap_char_next,
-
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_InitFunc)     pfr_cmap_init,        /* init       */
+    (FT_CMap_DoneFunc)     pfr_cmap_done,        /* done       */
+    (FT_CMap_CharIndexFunc)pfr_cmap_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) pfr_cmap_char_next,   /* char_next  */
+
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   };
 
 
diff --git a/src/pfr/pfrdrivr.c b/src/pfr/pfrdrivr.c
index b81c15e56..2316cd3e7 100644
--- a/src/pfr/pfrdrivr.c
+++ b/src/pfr/pfrdrivr.c
@@ -181,10 +181,10 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
-      0,                        /* FT_Module_Constructor  module_init   */
-      0,                        /* FT_Module_Destructor   module_done   */
+      NULL,                     /* FT_Module_Constructor  module_init   */
+      NULL,                     /* FT_Module_Destructor   module_done   */
       pfr_get_service           /* FT_Module_Requester    get_interface */
     },
 
@@ -194,19 +194,19 @@
 
     pfr_face_init,              /* FT_Face_InitFunc  init_face */
     pfr_face_done,              /* FT_Face_DoneFunc  done_face */
-    0,                          /* FT_Size_InitFunc  init_size */
-    0,                          /* FT_Size_DoneFunc  done_size */
+    NULL,                       /* FT_Size_InitFunc  init_size */
+    NULL,                       /* FT_Size_DoneFunc  done_size */
     pfr_slot_init,              /* FT_Slot_InitFunc  init_slot */
     pfr_slot_done,              /* FT_Slot_DoneFunc  done_slot */
 
     pfr_slot_load,              /* FT_Slot_LoadFunc  load_glyph */
 
     pfr_get_kerning,            /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
-    0,                          /* FT_Size_RequestFunc  request_size */
-    0,                          /* FT_Size_SelectFunc   select_size  */
+    NULL,                       /* FT_Size_RequestFunc  request_size */
+    NULL,                       /* FT_Size_SelectFunc   select_size  */
   };
 
 
diff --git a/src/psaux/psauxmod.c b/src/psaux/psauxmod.c
index 80805e695..b1b8b19c3 100644
--- a/src/psaux/psauxmod.c
+++ b/src/psaux/psauxmod.c
@@ -30,52 +30,56 @@
   FT_CALLBACK_TABLE_DEF
   const PS_Table_FuncsRec  ps_table_funcs =
   {
-    ps_table_new,
-    ps_table_done,
-    ps_table_add,
-    ps_table_release
+    ps_table_new,     /* init    */
+    ps_table_done,    /* done    */
+    ps_table_add,     /* add     */
+    ps_table_release  /* release */
   };
 
 
   FT_CALLBACK_TABLE_DEF
   const PS_Parser_FuncsRec  ps_parser_funcs =
   {
-    ps_parser_init,
-    ps_parser_done,
-    ps_parser_skip_spaces,
-    ps_parser_skip_PS_token,
-    ps_parser_to_int,
-    ps_parser_to_fixed,
-    ps_parser_to_bytes,
-    ps_parser_to_coord_array,
-    ps_parser_to_fixed_array,
-    ps_parser_to_token,
-    ps_parser_to_token_array,
-    ps_parser_load_field,
-    ps_parser_load_field_table
+    ps_parser_init,             /* init             */
+    ps_parser_done,             /* done             */
+
+    ps_parser_skip_spaces,      /* skip_spaces      */
+    ps_parser_skip_PS_token,    /* skip_PS_token    */
+
+    ps_parser_to_int,           /* to_int           */
+    ps_parser_to_fixed,         /* to_fixed         */
+    ps_parser_to_bytes,         /* to_bytes         */
+    ps_parser_to_coord_array,   /* to_coord_array   */
+    ps_parser_to_fixed_array,   /* to_fixed_array   */
+    ps_parser_to_token,         /* to_token         */
+    ps_parser_to_token_array,   /* to_token_array   */
+
+    ps_parser_load_field,       /* load_field       */
+    ps_parser_load_field_table  /* load_field_table */
   };
 
 
   FT_CALLBACK_TABLE_DEF
   const T1_Builder_FuncsRec  t1_builder_funcs =
   {
-    t1_builder_init,
-    t1_builder_done,
-    t1_builder_check_points,
-    t1_builder_add_point,
-    t1_builder_add_point1,
-    t1_builder_add_contour,
-    t1_builder_start_point,
-    t1_builder_close_contour
+    t1_builder_init,          /* init */
+    t1_builder_done,          /* done */
+
+    t1_builder_check_points,  /* check_points  */
+    t1_builder_add_point,     /* add_point     */
+    t1_builder_add_point1,    /* add_point1    */
+    t1_builder_add_contour,   /* add_contour   */
+    t1_builder_start_point,   /* start_point   */
+    t1_builder_close_contour  /* close_contour */
   };
 
 
   FT_CALLBACK_TABLE_DEF
   const T1_Decoder_FuncsRec  t1_decoder_funcs =
   {
-    t1_decoder_init,
-    t1_decoder_done,
-    t1_decoder_parse_charstrings
+    t1_decoder_init,              /* init              */
+    t1_decoder_done,              /* done              */
+    t1_decoder_parse_charstrings  /* parse_charstrings */
   };
 
 
@@ -83,9 +87,9 @@
   FT_CALLBACK_TABLE_DEF
   const AFM_Parser_FuncsRec  afm_parser_funcs =
   {
-    afm_parser_init,
-    afm_parser_done,
-    afm_parser_parse
+    afm_parser_init,  /* init  */
+    afm_parser_done,  /* done  */
+    afm_parser_parse  /* parse */
   };
 #endif
 
@@ -130,9 +134,9 @@
 
     &psaux_interface,  /* module-specific interface */
 
-    (FT_Module_Constructor)0,
-    (FT_Module_Destructor) 0,
-    (FT_Module_Requester)  0
+    (FT_Module_Constructor)NULL,  /* module_init   */
+    (FT_Module_Destructor) NULL,  /* module_done   */
+    (FT_Module_Requester)  NULL   /* get_interface */
   };
 
 
diff --git a/src/psaux/t1cmap.c b/src/psaux/t1cmap.c
index 43abb9861..d35243589 100644
--- a/src/psaux/t1cmap.c
+++ b/src/psaux/t1cmap.c
@@ -136,12 +136,16 @@
   {
     sizeof ( T1_CMapStdRec ),
 
-    (FT_CMap_InitFunc)     t1_cmap_standard_init,
-    (FT_CMap_DoneFunc)     t1_cmap_std_done,
-    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,
-    (FT_CMap_CharNextFunc) t1_cmap_std_char_next,
-
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_InitFunc)     t1_cmap_standard_init,   /* init       */
+    (FT_CMap_DoneFunc)     t1_cmap_std_done,        /* done       */
+    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) t1_cmap_std_char_next,   /* char_next  */
+
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   };
 
 
@@ -161,12 +165,16 @@
   {
     sizeof ( T1_CMapStdRec ),
 
-    (FT_CMap_InitFunc)     t1_cmap_expert_init,
-    (FT_CMap_DoneFunc)     t1_cmap_std_done,
-    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,
-    (FT_CMap_CharNextFunc) t1_cmap_std_char_next,
+    (FT_CMap_InitFunc)     t1_cmap_expert_init,     /* init       */
+    (FT_CMap_DoneFunc)     t1_cmap_std_done,        /* done       */
+    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) t1_cmap_std_char_next,   /* char_next  */
 
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   };
 
 
@@ -257,12 +265,16 @@
   {
     sizeof ( T1_CMapCustomRec ),
 
-    (FT_CMap_InitFunc)     t1_cmap_custom_init,
-    (FT_CMap_DoneFunc)     t1_cmap_custom_done,
-    (FT_CMap_CharIndexFunc)t1_cmap_custom_char_index,
-    (FT_CMap_CharNextFunc) t1_cmap_custom_char_next,
+    (FT_CMap_InitFunc)     t1_cmap_custom_init,        /* init       */
+    (FT_CMap_DoneFunc)     t1_cmap_custom_done,        /* done       */
+    (FT_CMap_CharIndexFunc)t1_cmap_custom_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) t1_cmap_custom_char_next,   /* char_next  */
 
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   };
 
 
@@ -343,12 +355,16 @@
   {
     sizeof ( PS_UnicodesRec ),
 
-    (FT_CMap_InitFunc)     t1_cmap_unicode_init,
-    (FT_CMap_DoneFunc)     t1_cmap_unicode_done,
-    (FT_CMap_CharIndexFunc)t1_cmap_unicode_char_index,
-    (FT_CMap_CharNextFunc) t1_cmap_unicode_char_next,
+    (FT_CMap_InitFunc)     t1_cmap_unicode_init,        /* init       */
+    (FT_CMap_DoneFunc)     t1_cmap_unicode_done,        /* done       */
+    (FT_CMap_CharIndexFunc)t1_cmap_unicode_char_index,  /* char_index */
+    (FT_CMap_CharNextFunc) t1_cmap_unicode_char_next,   /* char_next  */
 
-    NULL, NULL, NULL, NULL, NULL
+    (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+    (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+    (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+    (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+    (FT_CMap_VariantCharListFunc) NULL   /* variantchar_list */
   };
 
 
diff --git a/src/pshinter/pshmod.c b/src/pshinter/pshmod.c
index fa4ad1f56..d5d53ab2d 100644
--- a/src/pshinter/pshmod.c
+++ b/src/pshinter/pshmod.c
@@ -95,9 +95,11 @@
 
   FT_DEFINE_PSHINTER_INTERFACE(
     pshinter_interface,
+
     pshinter_get_globals_funcs,
     pshinter_get_t1_funcs,
-    pshinter_get_t2_funcs )
+    pshinter_get_t2_funcs
+  )
 
 
   FT_DEFINE_MODULE(
@@ -111,9 +113,9 @@
 
     &PSHINTER_INTERFACE_GET,              /* module-specific interface */
 
-    (FT_Module_Constructor)ps_hinter_init,
-    (FT_Module_Destructor) ps_hinter_done,
-    (FT_Module_Requester)  NULL )   /* no additional interface for now */
-
+    (FT_Module_Constructor)ps_hinter_init,  /* module_init   */
+    (FT_Module_Destructor) ps_hinter_done,  /* module_done   */
+    (FT_Module_Requester)  NULL             /* get_interface */
+  )
 
 /* END */
diff --git a/src/psnames/psmodule.c b/src/psnames/psmodule.c
index 345402d7c..3ea9b2701 100644
--- a/src/psnames/psmodule.c
+++ b/src/psnames/psmodule.c
@@ -525,6 +525,7 @@
 
   FT_DEFINE_SERVICE_PSCMAPSREC(
     pscmaps_interface,
+
     (PS_Unicode_ValueFunc)     ps_unicode_value,        /* unicode_value         */
     (PS_Unicodes_InitFunc)     ps_unicodes_init,        /* unicodes_init         */
     (PS_Unicodes_CharIndexFunc)ps_unicodes_char_index,  /* unicodes_char_index   */
@@ -534,12 +535,14 @@
     (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings     */
 
     t1_standard_encoding,                               /* adobe_std_encoding    */
-    t1_expert_encoding )                                /* adobe_expert_encoding */
+    t1_expert_encoding                                  /* adobe_expert_encoding */
+  )
 
 #else
 
   FT_DEFINE_SERVICE_PSCMAPSREC(
     pscmaps_interface,
+
     NULL,                                               /* unicode_value         */
     NULL,                                               /* unicodes_init         */
     NULL,                                               /* unicodes_char_index   */
@@ -549,13 +552,15 @@
     (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings     */
 
     t1_standard_encoding,                               /* adobe_std_encoding    */
-    t1_expert_encoding )                                /* adobe_expert_encoding */
+    t1_expert_encoding                                  /* adobe_expert_encoding */
+  )
 
 #endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
 
 
   FT_DEFINE_SERVICEDESCREC1(
     pscmaps_services,
+
     FT_SERVICE_ID_POSTSCRIPT_CMAPS, &PSCMAPS_INTERFACE_GET )
 
 
@@ -601,9 +606,11 @@
 
     PUT_PS_NAMES_SERVICE(
       (void*)&PSCMAPS_INTERFACE_GET ),   /* module specific interface */
-    (FT_Module_Constructor)NULL,
-    (FT_Module_Destructor) NULL,
-    (FT_Module_Requester)  PUT_PS_NAMES_SERVICE( psnames_get_service ) )
+
+    (FT_Module_Constructor)NULL,                                       /* module_init   */
+    (FT_Module_Destructor) NULL,                                       /* module_done   */
+    (FT_Module_Requester)  PUT_PS_NAMES_SERVICE( psnames_get_service ) /* get_interface */
+  )
 
 
 /* END */
diff --git a/src/raster/ftraster.c b/src/raster/ftraster.c
index 0fa2f2687..73c2fbf43 100644
--- a/src/raster/ftraster.c
+++ b/src/raster/ftraster.c
@@ -3208,11 +3208,12 @@
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Raster_New_Func)     ft_black_new,
-    (FT_Raster_Reset_Func)   ft_black_reset,
-    (FT_Raster_Set_Mode_Func)ft_black_set_mode,
-    (FT_Raster_Render_Func)  ft_black_render,
-    (FT_Raster_Done_Func)    ft_black_done )
+    (FT_Raster_New_Func)     ft_black_new,       /* raster_new      */
+    (FT_Raster_Reset_Func)   ft_black_reset,     /* raster_reset    */
+    (FT_Raster_Set_Mode_Func)ft_black_set_mode,  /* raster_set_mode */
+    (FT_Raster_Render_Func)  ft_black_render,    /* raster_render   */
+    (FT_Raster_Done_Func)    ft_black_done       /* raster_done     */
+  )
 
 
 /* END */
diff --git a/src/raster/ftrend1.c b/src/raster/ftrend1.c
index 494f11223..c456dc52d 100644
--- a/src/raster/ftrend1.c
+++ b/src/raster/ftrend1.c
@@ -224,7 +224,8 @@
   }
 
 
-  FT_DEFINE_RENDERER( ft_raster1_renderer_class,
+  FT_DEFINE_RENDERER(
+    ft_raster1_renderer_class,
 
       FT_MODULE_RENDERER,
       sizeof ( FT_RendererRec ),
@@ -233,21 +234,20 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module specific interface */
+      NULL,    /* module specific interface */
 
-      (FT_Module_Constructor)ft_raster1_init,
-      (FT_Module_Destructor) 0,
-      (FT_Module_Requester)  0
-    ,
+      (FT_Module_Constructor)ft_raster1_init,  /* module_init   */
+      (FT_Module_Destructor) NULL,             /* module_done   */
+      (FT_Module_Requester)  NULL,             /* get_interface */
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Renderer_RenderFunc)   ft_raster1_render,
-    (FT_Renderer_TransformFunc)ft_raster1_transform,
-    (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
-    (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
+    (FT_Renderer_RenderFunc)   ft_raster1_render,     /* render_glyph    */
+    (FT_Renderer_TransformFunc)ft_raster1_transform,  /* transform_glyph */
+    (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,   /* get_glyph_cbox  */
+    (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,   /* set_mode        */
 
-    (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
+    (FT_Raster_Funcs*)&FT_STANDARD_RASTER_GET         /* raster_class    */
   )
 
 
diff --git a/src/sfnt/sfdriver.c b/src/sfnt/sfdriver.c
index 22332694b..b838d77fc 100644
--- a/src/sfnt/sfdriver.c
+++ b/src/sfnt/sfdriver.c
@@ -139,9 +139,11 @@
 
   FT_DEFINE_SERVICE_SFNT_TABLEREC(
     sfnt_service_sfnt_table,
+
     (FT_SFNT_TableLoadFunc)tt_face_load_any,     /* load_table */
     (FT_SFNT_TableGetFunc) get_sfnt_table,       /* get_table  */
-    (FT_SFNT_TableInfoFunc)sfnt_table_info )     /* table_info */
+    (FT_SFNT_TableInfoFunc)sfnt_table_info       /* table_info */
+  )
 
 
 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
@@ -205,9 +207,10 @@
 
   FT_DEFINE_SERVICE_GLYPHDICTREC(
     sfnt_service_glyph_dict,
-    (FT_GlyphDict_GetNameFunc)  sfnt_get_glyph_name,    /* get_name   */
-    (FT_GlyphDict_NameIndexFunc)sfnt_get_name_index )   /* name_index */
 
+    (FT_GlyphDict_GetNameFunc)  sfnt_get_glyph_name,    /* get_name   */
+    (FT_GlyphDict_NameIndexFunc)sfnt_get_name_index     /* name_index */
+  )
 
 #endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
 
@@ -330,7 +333,9 @@
 
   FT_DEFINE_SERVICE_PSFONTNAMEREC(
     sfnt_service_ps_name,
-    (FT_PsName_GetFunc)sfnt_get_ps_name )     /* get_ps_font_name */
+
+    (FT_PsName_GetFunc)sfnt_get_ps_name       /* get_ps_font_name */
+  )
 
 
   /*
@@ -338,7 +343,9 @@
    */
   FT_DEFINE_SERVICE_TTCMAPSREC(
     tt_service_get_cmap_info,
-    (TT_CMap_Info_GetFunc)tt_get_cmap_info )  /* get_cmap_info */
+
+    (TT_CMap_Info_GetFunc)tt_get_cmap_info    /* get_cmap_info */
+  )
 
 
 #ifdef TT_CONFIG_OPTION_BDF
@@ -381,8 +388,10 @@
 
   FT_DEFINE_SERVICE_BDFRec(
     sfnt_service_bdf,
+
     (FT_BDF_GetCharsetIdFunc)sfnt_get_charset_id,     /* get_charset_id */
-    (FT_BDF_GetPropertyFunc) tt_face_find_bdf_prop )  /* get_property   */
+    (FT_BDF_GetPropertyFunc) tt_face_find_bdf_prop    /* get_property   */
+  )
 
 
 #endif /* TT_CONFIG_OPTION_BDF */
@@ -395,6 +404,7 @@
 #if defined TT_CONFIG_OPTION_POSTSCRIPT_NAMES && defined TT_CONFIG_OPTION_BDF
   FT_DEFINE_SERVICEDESCREC5(
     sfnt_services,
+
     FT_SERVICE_ID_SFNT_TABLE,           &SFNT_SERVICE_SFNT_TABLE_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &SFNT_SERVICE_PS_NAME_GET,
     FT_SERVICE_ID_GLYPH_DICT,           &SFNT_SERVICE_GLYPH_DICT_GET,
@@ -403,6 +413,7 @@
 #elif defined TT_CONFIG_OPTION_POSTSCRIPT_NAMES
   FT_DEFINE_SERVICEDESCREC4(
     sfnt_services,
+
     FT_SERVICE_ID_SFNT_TABLE,           &SFNT_SERVICE_SFNT_TABLE_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &SFNT_SERVICE_PS_NAME_GET,
     FT_SERVICE_ID_GLYPH_DICT,           &SFNT_SERVICE_GLYPH_DICT_GET,
@@ -410,6 +421,7 @@
 #elif defined TT_CONFIG_OPTION_BDF
   FT_DEFINE_SERVICEDESCREC4(
     sfnt_services,
+
     FT_SERVICE_ID_SFNT_TABLE,           &SFNT_SERVICE_SFNT_TABLE_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &SFNT_SERVICE_PS_NAME_GET,
     FT_SERVICE_ID_BDF,                  &SFNT_SERVICE_BDF_GET,
@@ -417,6 +429,7 @@
 #else
   FT_DEFINE_SERVICEDESCREC3(
     sfnt_services,
+
     FT_SERVICE_ID_SFNT_TABLE,           &SFNT_SERVICE_SFNT_TABLE_GET,
     FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &SFNT_SERVICE_PS_NAME_GET,
     FT_SERVICE_ID_TT_CMAP,              &TT_SERVICE_CMAP_INFO_GET )
@@ -459,6 +472,7 @@
 
   FT_DEFINE_SFNT_INTERFACE(
     sfnt_interface,
+
     tt_face_goto_table,     /* TT_Loader_GotoTableFunc goto_table      */
 
     sfnt_init_face,         /* TT_Init_Face_Func       init_face       */
@@ -530,9 +544,10 @@
 
     (const void*)&SFNT_INTERFACE_GET,  /* module specific interface */
 
-    (FT_Module_Constructor)0,
-    (FT_Module_Destructor) 0,
-    (FT_Module_Requester)  sfnt_get_interface )
+    (FT_Module_Constructor)NULL,               /* module_init   */
+    (FT_Module_Destructor) NULL,               /* module_done   */
+    (FT_Module_Requester)  sfnt_get_interface  /* get_interface */
+  )
 
 
 /* END */
diff --git a/src/sfnt/ttcmap.c b/src/sfnt/ttcmap.c
index cd7467d4d..24b06e01c 100644
--- a/src/sfnt/ttcmap.c
+++ b/src/sfnt/ttcmap.c
@@ -180,22 +180,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap0_class_rec,
-    sizeof ( TT_CMapRec ),
 
-    (FT_CMap_InitFunc)     tt_cmap_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap0_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap0_char_next,
+      sizeof ( TT_CMapRec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap_init,         /* init       */
+      (FT_CMap_DoneFunc)     NULL,                 /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap0_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap0_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     0,
-    (TT_CMap_ValidateFunc)tt_cmap0_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap0_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap0_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap0_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_0 */
 
@@ -571,22 +573,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap2_class_rec,
-    sizeof ( TT_CMapRec ),
 
-    (FT_CMap_InitFunc)     tt_cmap_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap2_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap2_char_next,
+      sizeof ( TT_CMapRec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap_init,         /* init       */
+      (FT_CMap_DoneFunc)     NULL,                 /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap2_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap2_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     2,
-    (TT_CMap_ValidateFunc)tt_cmap2_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap2_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap2_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap2_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_2 */
 
@@ -1516,21 +1520,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap4_class_rec,
-    sizeof ( TT_CMap4Rec ),
-    (FT_CMap_InitFunc)     tt_cmap4_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap4_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap4_char_next,
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      sizeof ( TT_CMap4Rec ),
+
+      (FT_CMap_InitFunc)     tt_cmap4_init,        /* init       */
+      (FT_CMap_DoneFunc)     NULL,                 /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap4_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap4_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     4,
-    (TT_CMap_ValidateFunc)tt_cmap4_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap4_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap4_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap4_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_4 */
 
@@ -1683,22 +1690,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap6_class_rec,
-    sizeof ( TT_CMapRec ),
 
-    (FT_CMap_InitFunc)     tt_cmap_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap6_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap6_char_next,
+      sizeof ( TT_CMapRec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap_init,         /* init       */
+      (FT_CMap_DoneFunc)     NULL,                 /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap6_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap6_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     6,
-    (TT_CMap_ValidateFunc)tt_cmap6_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap6_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap6_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap6_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_6 */
 
@@ -1975,22 +1984,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap8_class_rec,
-    sizeof ( TT_CMapRec ),
 
-    (FT_CMap_InitFunc)     tt_cmap_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap8_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap8_char_next,
+      sizeof ( TT_CMapRec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap_init,         /* init       */
+      (FT_CMap_DoneFunc)     NULL,                 /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap8_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap8_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     8,
-    (TT_CMap_ValidateFunc)tt_cmap8_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap8_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap8_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap8_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_8 */
 
@@ -2145,22 +2156,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap10_class_rec,
-    sizeof ( TT_CMapRec ),
 
-    (FT_CMap_InitFunc)     tt_cmap_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap10_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap10_char_next,
+      sizeof ( TT_CMapRec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap_init,          /* init       */
+      (FT_CMap_DoneFunc)     NULL,                  /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap10_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap10_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     10,
-    (TT_CMap_ValidateFunc)tt_cmap10_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap10_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap10_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap10_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_10 */
 
@@ -2499,22 +2512,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap12_class_rec,
-    sizeof ( TT_CMap12Rec ),
 
-    (FT_CMap_InitFunc)     tt_cmap12_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap12_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap12_char_next,
+      sizeof ( TT_CMap12Rec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap12_init,        /* init       */
+      (FT_CMap_DoneFunc)     NULL,                  /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap12_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap12_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     12,
-    (TT_CMap_ValidateFunc)tt_cmap12_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap12_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap12_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap12_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_12 */
 
@@ -2823,22 +2838,24 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap13_class_rec,
-    sizeof ( TT_CMap13Rec ),
 
-    (FT_CMap_InitFunc)     tt_cmap13_init,
-    (FT_CMap_DoneFunc)     NULL,
-    (FT_CMap_CharIndexFunc)tt_cmap13_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap13_char_next,
+      sizeof ( TT_CMap13Rec ),
 
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+      (FT_CMap_InitFunc)     tt_cmap13_init,        /* init       */
+      (FT_CMap_DoneFunc)     NULL,                  /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap13_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap13_char_next,   /* char_next  */
+
+      (FT_CMap_CharVarIndexFunc)    NULL,  /* char_var_index   */
+      (FT_CMap_CharVarIsDefaultFunc)NULL,  /* char_var_default */
+      (FT_CMap_VariantListFunc)     NULL,  /* variant_list     */
+      (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
+      (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
     13,
-    (TT_CMap_ValidateFunc)tt_cmap13_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap13_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap13_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap13_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_13 */
 
@@ -3582,23 +3599,25 @@
 
   FT_DEFINE_TT_CMAP(
     tt_cmap14_class_rec,
-    sizeof ( TT_CMap14Rec ),
 
-    (FT_CMap_InitFunc)     tt_cmap14_init,
-    (FT_CMap_DoneFunc)     tt_cmap14_done,
-    (FT_CMap_CharIndexFunc)tt_cmap14_char_index,
-    (FT_CMap_CharNextFunc) tt_cmap14_char_next,
+      sizeof ( TT_CMap14Rec ),
+
+      (FT_CMap_InitFunc)     tt_cmap14_init,        /* init       */
+      (FT_CMap_DoneFunc)     tt_cmap14_done,        /* done       */
+      (FT_CMap_CharIndexFunc)tt_cmap14_char_index,  /* char_index */
+      (FT_CMap_CharNextFunc) tt_cmap14_char_next,   /* char_next  */
 
-    /* Format 14 extension functions */
-    (FT_CMap_CharVarIndexFunc)    tt_cmap14_char_var_index,
-    (FT_CMap_CharVarIsDefaultFunc)tt_cmap14_char_var_isdefault,
-    (FT_CMap_VariantListFunc)     tt_cmap14_variants,
-    (FT_CMap_CharVariantListFunc) tt_cmap14_char_variants,
-    (FT_CMap_VariantCharListFunc) tt_cmap14_variant_chars,
+      /* Format 14 extension functions */
+      (FT_CMap_CharVarIndexFunc)    tt_cmap14_char_var_index,
+      (FT_CMap_CharVarIsDefaultFunc)tt_cmap14_char_var_isdefault,
+      (FT_CMap_VariantListFunc)     tt_cmap14_variants,
+      (FT_CMap_CharVariantListFunc) tt_cmap14_char_variants,
+      (FT_CMap_VariantCharListFunc) tt_cmap14_variant_chars,
 
     14,
-    (TT_CMap_ValidateFunc)tt_cmap14_validate,
-    (TT_CMap_Info_GetFunc)tt_cmap14_get_info )
+    (TT_CMap_ValidateFunc)tt_cmap14_validate,  /* validate      */
+    (TT_CMap_Info_GetFunc)tt_cmap14_get_info   /* get_cmap_info */
+  )
 
 #endif /* TT_CONFIG_CMAP_FORMAT_14 */
 
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index e75763519..75108da21 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1697,12 +1697,14 @@ typedef ptrdiff_t  FT_PtrDist;
   FT_DEFINE_OUTLINE_FUNCS(
     func_interface,
 
-    (FT_Outline_MoveTo_Func) gray_move_to,
-    (FT_Outline_LineTo_Func) gray_line_to,
-    (FT_Outline_ConicTo_Func)gray_conic_to,
-    (FT_Outline_CubicTo_Func)gray_cubic_to,
-    0,
-    0 )
+    (FT_Outline_MoveTo_Func) gray_move_to,   /* move_to  */
+    (FT_Outline_LineTo_Func) gray_line_to,   /* line_to  */
+    (FT_Outline_ConicTo_Func)gray_conic_to,  /* conic_to */
+    (FT_Outline_CubicTo_Func)gray_cubic_to,  /* cubic_to */
+
+    0,                                       /* shift    */
+    0                                        /* delta    */
+  )
 
 
   static int
@@ -2039,11 +2041,12 @@ typedef ptrdiff_t  FT_PtrDist;
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Raster_New_Func)     gray_raster_new,
-    (FT_Raster_Reset_Func)   gray_raster_reset,
-    (FT_Raster_Set_Mode_Func)gray_raster_set_mode,
-    (FT_Raster_Render_Func)  gray_raster_render,
-    (FT_Raster_Done_Func)    gray_raster_done )
+    (FT_Raster_New_Func)     gray_raster_new,       /* raster_new      */
+    (FT_Raster_Reset_Func)   gray_raster_reset,     /* raster_reset    */
+    (FT_Raster_Set_Mode_Func)gray_raster_set_mode,  /* raster_set_mode */
+    (FT_Raster_Render_Func)  gray_raster_render,    /* raster_render   */
+    (FT_Raster_Done_Func)    gray_raster_done       /* raster_done     */
+  )
 
 
 /* END */
diff --git a/src/smooth/ftsmooth.c b/src/smooth/ftsmooth.c
index 79276765b..866427e52 100644
--- a/src/smooth/ftsmooth.c
+++ b/src/smooth/ftsmooth.c
@@ -428,7 +428,8 @@
   }
 
 
-  FT_DEFINE_RENDERER( ft_smooth_renderer_class,
+  FT_DEFINE_RENDERER(
+    ft_smooth_renderer_class,
 
       FT_MODULE_RENDERER,
       sizeof ( FT_RendererRec ),
@@ -437,25 +438,25 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module specific interface */
+      NULL,    /* module specific interface */
 
-      (FT_Module_Constructor)ft_smooth_init,
-      (FT_Module_Destructor) 0,
-      (FT_Module_Requester)  0
-    ,
+      (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
+      (FT_Module_Destructor) NULL,            /* module_done   */
+      (FT_Module_Requester)  NULL,            /* get_interface */
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Renderer_RenderFunc)   ft_smooth_render,
-    (FT_Renderer_TransformFunc)ft_smooth_transform,
-    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
-    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+    (FT_Renderer_RenderFunc)   ft_smooth_render,     /* render_glyph    */
+    (FT_Renderer_TransformFunc)ft_smooth_transform,  /* transform_glyph */
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,   /* get_glyph_cbox  */
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,   /* set_mode        */
 
-    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+    (FT_Raster_Funcs*)&FT_GRAYS_RASTER_GET           /* raster_class    */
   )
 
 
-  FT_DEFINE_RENDERER( ft_smooth_lcd_renderer_class,
+  FT_DEFINE_RENDERER(
+    ft_smooth_lcd_renderer_class,
 
       FT_MODULE_RENDERER,
       sizeof ( FT_RendererRec ),
@@ -464,24 +465,25 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module specific interface */
+      NULL,    /* module specific interface */
 
-      (FT_Module_Constructor)ft_smooth_init,
-      (FT_Module_Destructor) 0,
-      (FT_Module_Requester)  0
-    ,
+      (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
+      (FT_Module_Destructor) NULL,            /* module_done   */
+      (FT_Module_Requester)  NULL,            /* get_interface */
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd,
-    (FT_Renderer_TransformFunc)ft_smooth_transform,
-    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
-    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd,  /* render_glyph    */
+    (FT_Renderer_TransformFunc)ft_smooth_transform,   /* transform_glyph */
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,    /* get_glyph_cbox  */
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,    /* set_mode        */
 
-    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+    (FT_Raster_Funcs*)&FT_GRAYS_RASTER_GET            /* raster_class    */
   )
 
-  FT_DEFINE_RENDERER( ft_smooth_lcdv_renderer_class,
+
+  FT_DEFINE_RENDERER(
+    ft_smooth_lcdv_renderer_class,
 
       FT_MODULE_RENDERER,
       sizeof ( FT_RendererRec ),
@@ -490,21 +492,20 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module specific interface */
+      NULL,    /* module specific interface */
 
-      (FT_Module_Constructor)ft_smooth_init,
-      (FT_Module_Destructor) 0,
-      (FT_Module_Requester)  0
-    ,
+      (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
+      (FT_Module_Destructor) NULL,            /* module_done   */
+      (FT_Module_Requester)  NULL,            /* get_interface */
 
     FT_GLYPH_FORMAT_OUTLINE,
 
-    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd_v,
-    (FT_Renderer_TransformFunc)ft_smooth_transform,
-    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
-    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd_v,  /* render_glyph    */
+    (FT_Renderer_TransformFunc)ft_smooth_transform,     /* transform_glyph */
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,      /* get_glyph_cbox  */
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,      /* set_mode        */
 
-    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+    (FT_Raster_Funcs*)&FT_GRAYS_RASTER_GET              /* raster_class    */
   )
 
 
diff --git a/src/truetype/ttdriver.c b/src/truetype/ttdriver.c
index b96a2276c..db8c63b01 100644
--- a/src/truetype/ttdriver.c
+++ b/src/truetype/ttdriver.c
@@ -144,8 +144,10 @@
 
   FT_DEFINE_SERVICE_PROPERTIESREC(
     tt_service_properties,
+
     (FT_Properties_SetFunc)tt_property_set,     /* set_property */
-    (FT_Properties_GetFunc)tt_property_get )    /* get_property */
+    (FT_Properties_GetFunc)tt_property_get      /* get_property */
+  )
 
 
   /*************************************************************************/
@@ -464,11 +466,13 @@
 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
   FT_DEFINE_SERVICE_MULTIMASTERSREC(
     tt_service_gx_multi_masters,
+
     (FT_Get_MM_Func)        NULL,                   /* get_mm         */
     (FT_Set_MM_Design_Func) NULL,                   /* set_mm_design  */
     (FT_Set_MM_Blend_Func)  TT_Set_MM_Blend,        /* set_mm_blend   */
     (FT_Get_MM_Var_Func)    TT_Get_MM_Var,          /* get_mm_var     */
-    (FT_Set_Var_Design_Func)TT_Set_Var_Design )     /* set_var_design */
+    (FT_Set_Var_Design_Func)TT_Set_Var_Design       /* set_var_design */
+  )
 #endif
 
 
@@ -488,12 +492,15 @@
 
   FT_DEFINE_SERVICE_TTGLYFREC(
     tt_service_truetype_glyf,
-    (TT_Glyf_GetLocationFunc)tt_face_get_location )    /* get_location */
+
+    (TT_Glyf_GetLocationFunc)tt_face_get_location      /* get_location */
+  )
 
 
 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
   FT_DEFINE_SERVICEDESCREC5(
     tt_services,
+
     FT_SERVICE_ID_FONT_FORMAT,     FT_FONT_FORMAT_TRUETYPE,
     FT_SERVICE_ID_MULTI_MASTERS,   &TT_SERVICE_GX_MULTI_MASTERS_GET,
     FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine,
@@ -502,6 +509,7 @@
 #else
   FT_DEFINE_SERVICEDESCREC4(
     tt_services,
+
     FT_SERVICE_ID_FONT_FORMAT,     FT_FONT_FORMAT_TRUETYPE,
     FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine,
     FT_SERVICE_ID_TT_GLYF,         &TT_SERVICE_TRUETYPE_GLYF_GET,
@@ -580,7 +588,7 @@
       0x10000L,        /* driver version == 1.0                 */
       0x20000L,        /* driver requires FreeType 2.0 or above */
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
       tt_driver_init,           /* FT_Module_Constructor  module_init   */
       tt_driver_done,           /* FT_Module_Destructor   module_done   */
@@ -595,12 +603,12 @@
     tt_size_init,               /* FT_Size_InitFunc  init_size */
     tt_size_done,               /* FT_Size_DoneFunc  done_size */
     tt_slot_init,               /* FT_Slot_InitFunc  init_slot */
-    0,                          /* FT_Slot_DoneFunc  done_slot */
+    NULL,                       /* FT_Slot_DoneFunc  done_slot */
 
     tt_glyph_load,              /* FT_Slot_LoadFunc  load_glyph */
 
     tt_get_kerning,             /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
     tt_get_advances,            /* FT_Face_GetAdvancesFunc  get_advances */
 
     tt_size_request,            /* FT_Size_RequestFunc  request_size */
diff --git a/src/type1/t1driver.c b/src/type1/t1driver.c
index f1e60d452..c8a87d585 100644
--- a/src/type1/t1driver.c
+++ b/src/type1/t1driver.c
@@ -714,7 +714,7 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
       T1_Driver_Init,           /* FT_Module_Constructor  module_init   */
       T1_Driver_Done,           /* FT_Module_Destructor   module_done   */
@@ -735,8 +735,8 @@
     T1_Load_Glyph,              /* FT_Slot_LoadFunc  load_glyph */
 
 #ifdef T1_CONFIG_OPTION_NO_AFM
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
 #else
     Get_Kerning,                /* FT_Face_GetKerningFunc   get_kerning  */
     T1_Read_Metrics,            /* FT_Face_AttachFunc       attach_file  */
@@ -744,7 +744,7 @@
     T1_Get_Advances,            /* FT_Face_GetAdvancesFunc  get_advances */
 
     T1_Size_Request,            /* FT_Size_RequestFunc  request_size */
-    0                           /* FT_Size_SelectFunc   select_size  */
+    NULL                        /* FT_Size_SelectFunc   select_size  */
   };
 
 
diff --git a/src/type42/t42drivr.c b/src/type42/t42drivr.c
index 54c4eb328..dad35c2b1 100644
--- a/src/type42/t42drivr.c
+++ b/src/type42/t42drivr.c
@@ -214,7 +214,7 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL,    /* module-specific interface */
 
       T42_Driver_Init,          /* FT_Module_Constructor  module_init   */
       T42_Driver_Done,          /* FT_Module_Destructor   module_done   */
@@ -234,9 +234,9 @@
 
     T42_GlyphSlot_Load,         /* FT_Slot_LoadFunc  load_glyph */
 
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
     T42_Size_Request,           /* FT_Size_RequestFunc  request_size */
     T42_Size_Select             /* FT_Size_SelectFunc   select_size  */
diff --git a/src/winfonts/winfnt.c b/src/winfonts/winfnt.c
index a0a18001b..b412f105d 100644
--- a/src/winfonts/winfnt.c
+++ b/src/winfonts/winfnt.c
@@ -1170,10 +1170,10 @@
       0x10000L,
       0x20000L,
 
-      0,    /* module-specific interface */
+      NULL, /* module-specific interface */
 
-      0,                        /* FT_Module_Constructor  module_init   */
-      0,                        /* FT_Module_Destructor   module_done   */
+      NULL,                     /* FT_Module_Constructor  module_init   */
+      NULL,                     /* FT_Module_Destructor   module_done   */
       winfnt_get_service        /* FT_Module_Requester    get_interface */
     },
 
@@ -1183,16 +1183,16 @@
 
     FNT_Face_Init,              /* FT_Face_InitFunc  init_face */
     FNT_Face_Done,              /* FT_Face_DoneFunc  done_face */
-    0,                          /* FT_Size_InitFunc  init_size */
-    0,                          /* FT_Size_DoneFunc  done_size */
-    0,                          /* FT_Slot_InitFunc  init_slot */
-    0,                          /* FT_Slot_DoneFunc  done_slot */
+    NULL,                       /* FT_Size_InitFunc  init_size */
+    NULL,                       /* FT_Size_DoneFunc  done_size */
+    NULL,                       /* FT_Slot_InitFunc  init_slot */
+    NULL,                       /* FT_Slot_DoneFunc  done_slot */
 
     FNT_Load_Glyph,             /* FT_Slot_LoadFunc  load_glyph */
 
-    0,                          /* FT_Face_GetKerningFunc   get_kerning  */
-    0,                          /* FT_Face_AttachFunc       attach_file  */
-    0,                          /* FT_Face_GetAdvancesFunc  get_advances */
+    NULL,                       /* FT_Face_GetKerningFunc   get_kerning  */
+    NULL,                       /* FT_Face_AttachFunc       attach_file  */
+    NULL,                       /* FT_Face_GetAdvancesFunc  get_advances */
 
     FNT_Size_Request,           /* FT_Size_RequestFunc  request_size */
     FNT_Size_Select             /* FT_Size_SelectFunc   select_size  */