kc3-lang/libxkbcommon/src/keymap-dump.c

Branch : - branch - android master - tag -

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  Commit

• Author : Ran Benita
  Date : 2012-10-22 20:49:44
  Hash : 6a94b122
  Message : Split the mods, layout, leds parts of xkb_state_components Note first: This commits breaks the ABI somewhat. If an application is run against this commit without recompiling against the updated header, these break: - xkb_state_layout_*_is_active always retuns false. - xkb_state_serialize_mods always returns 0. So it might break layout switching in some applications. However, xkbcommon-compat.h provides the necessary fixes, so recompiling should work (though updating the application is even better). Split the enum to its individual components, which enables us to refer to them individually. We will use that later for reporting which components of the state have changed after update. Signed-off-by: Ran Benita <ran234@gmail.com>

• src/keymap-dump.c

• /************************************************************
   * Copyright (c) 1994 by Silicon Graphics Computer Systems, Inc.
   *
   * Permission to use, copy, modify, and distribute this
   * software and its documentation for any purpose and without
   * fee is hereby granted, provided that the above copyright
   * notice appear in all copies and that both that copyright
   * notice and this permission notice appear in supporting
   * documentation, and that the name of Silicon Graphics not be
   * used in advertising or publicity pertaining to distribution
   * of the software without specific prior written permission.
   * Silicon Graphics makes no representation about the suitability
   * of this software for any purpose. It is provided "as is"
   * without any express or implied warranty.
   *
   * SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
   * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
   * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
   * GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
   * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
   * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
   * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION  WITH
   * THE USE OR PERFORMANCE OF THIS SOFTWARE.
   *
   ********************************************************/
  
  /*
   * Copyright © 2012 Intel Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   *
   * Author: Daniel Stone <daniel@fooishbar.org>
   */
  
  #include "keymap.h"
  #include "text.h"
  
  #define VMOD_HIDE_VALUE    0
  #define VMOD_SHOW_VALUE    1
  #define VMOD_COMMENT_VALUE 2
  
  #define BUF_CHUNK_SIZE     4096
  
  struct buf {
      char *buf;
      size_t size;
      size_t alloc;
  };
  
  static bool
  do_realloc(struct buf *buf, size_t at_least)
  {
      char *new;
  
      buf->alloc += BUF_CHUNK_SIZE;
      if (at_least >= BUF_CHUNK_SIZE)
          buf->alloc += at_least;
  
      new = realloc(buf->buf, buf->alloc);
      if (!new)
          return false;
  
      buf->buf = new;
      return true;
  }
  
  ATTR_PRINTF(2, 3) static bool
  check_write_buf(struct buf *buf, const char *fmt, ...)
  {
      va_list args;
      int printed;
      size_t available;
  
      available = buf->alloc - buf->size;
      va_start(args, fmt);
      printed = vsnprintf(buf->buf + buf->size, available, fmt, args);
      va_end(args);
  
      if (printed < 0)
          goto err;
  
      if (printed >= available)
          if (!do_realloc(buf, printed))
              goto err;
  
      /* The buffer has enough space now. */
  
      available = buf->alloc - buf->size;
      va_start(args, fmt);
      printed = vsnprintf(buf->buf + buf->size, available, fmt, args);
      va_end(args);
  
      if (printed >= available || printed < 0)
          goto err;
  
      buf->size += printed;
      return true;
  
  err:
      free(buf->buf);
      buf->buf = NULL;
      return false;
  }
  
  #define write_buf(buf, ...) do { \
      if (!check_write_buf(buf, __VA_ARGS__)) \
          return false; \
  } while (0)
  
  static bool
  write_vmods(struct xkb_keymap *keymap, struct buf *buf)
  {
      const struct xkb_mod *mod;
      xkb_mod_index_t num_vmods = 0;
  
      darray_foreach(mod, keymap->mods) {
          if (mod->type != MOD_VIRT)
              continue;
  
          if (num_vmods == 0)
              write_buf(buf, "\t\tvirtual_modifiers ");
          else
              write_buf(buf, ",");
          write_buf(buf, "%s", xkb_atom_text(keymap->ctx, mod->name));
          num_vmods++;
      }
  
      if (num_vmods > 0)
          write_buf(buf, ";\n\n");
  
      return true;
  }
  
  static bool
  write_keycodes(struct xkb_keymap *keymap, struct buf *buf)
  {
      struct xkb_key *key;
      struct xkb_key_alias *alias;
      xkb_led_index_t i;
      const struct xkb_indicator_map *im;
  
      if (keymap->keycodes_section_name)
          write_buf(buf, "\txkb_keycodes \"%s\" {\n",
                    keymap->keycodes_section_name);
      else
          write_buf(buf, "\txkb_keycodes {\n");
  
      xkb_foreach_key(key, keymap) {
          if (key->name == XKB_ATOM_NONE)
              continue;
  
          write_buf(buf, "\t\t%-20s = %d;\n",
                    KeyNameText(keymap->ctx, key->name), key->keycode);
      }
  
      darray_enumerate(i, im, keymap->indicators)
          if (im->name != XKB_ATOM_NONE)
              write_buf(buf, "\t\tindicator %d = \"%s\";\n",
                        i + 1, xkb_atom_text(keymap->ctx, im->name));
  
  
      darray_foreach(alias, keymap->key_aliases)
          write_buf(buf, "\t\talias %-14s = %s;\n",
                    KeyNameText(keymap->ctx, alias->alias),
                    KeyNameText(keymap->ctx, alias->real));
  
      write_buf(buf, "\t};\n\n");
      return true;
  }
  
  static bool
  write_types(struct xkb_keymap *keymap, struct buf *buf)
  {
      unsigned int i, j;
      xkb_level_index_t n;
      struct xkb_key_type *type;
      struct xkb_kt_map_entry *entry;
  
      if (keymap->types_section_name)
          write_buf(buf, "\txkb_types \"%s\" {\n\n",
                    keymap->types_section_name);
      else
          write_buf(buf, "\txkb_types {\n\n");
  
      write_vmods(keymap, buf);
  
      for (i = 0; i < keymap->num_types; i++) {
          type = &keymap->types[i];
  
          write_buf(buf, "\t\ttype \"%s\" {\n",
                    xkb_atom_text(keymap->ctx, type->name));
          write_buf(buf, "\t\t\tmodifiers= %s;\n",
                    ModMaskText(keymap, type->mods.mods));
  
          for (j = 0; j < type->num_entries; j++) {
              const char *str;
              entry = &type->map[j];
  
              /*
               * Printing level 1 entries is redundant, it's the default,
               * unless there's preserve info.
               */
              if (entry->level == 0 && entry->preserve.mods == 0)
                  continue;
  
              str = ModMaskText(keymap, entry->mods.mods);
              write_buf(buf, "\t\t\tmap[%s]= Level%d;\n",
                        str, entry->level + 1);
  
              if (entry->preserve.mods == 0)
                  continue;
  
              write_buf(buf, "\t\t\tpreserve[%s]= ", str);
              write_buf(buf, "%s;\n",
                        ModMaskText(keymap, entry->preserve.mods));
          }
  
          if (type->level_names) {
              for (n = 0; n < type->num_levels; n++) {
                  if (!type->level_names[n])
                      continue;
                  write_buf(buf, "\t\t\tlevel_name[Level%d]= \"%s\";\n", n + 1,
                            xkb_atom_text(keymap->ctx, type->level_names[n]));
              }
          }
          write_buf(buf, "\t\t};\n");
      }
  
      write_buf(buf, "\t};\n\n");
      return true;
  }
  
  static bool
  write_indicator_map(struct xkb_keymap *keymap, struct buf *buf,
                      const struct xkb_indicator_map *led)
  {
      write_buf(buf, "\t\tindicator \"%s\" {\n",
                xkb_atom_text(keymap->ctx, led->name));
  
      if (led->which_groups) {
          if (led->which_groups != XKB_STATE_LAYOUT_EFFECTIVE) {
              write_buf(buf, "\t\t\twhichGroupState= %s;\n",
                        IndicatorStateText(keymap->ctx, led->which_groups));
          }
          write_buf(buf, "\t\t\tgroups= 0x%02x;\n",
                    led->groups);
      }
  
      if (led->which_mods) {
          if (led->which_mods != XKB_STATE_MODS_EFFECTIVE) {
              write_buf(buf, "\t\t\twhichModState= %s;\n",
                        IndicatorStateText(keymap->ctx, led->which_mods));
          }
          write_buf(buf, "\t\t\tmodifiers= %s;\n",
                    ModMaskText(keymap, led->mods.mods));
      }
  
      if (led->ctrls) {
          write_buf(buf, "\t\t\tcontrols= %s;\n",
                    ControlMaskText(keymap->ctx, led->ctrls));
      }
  
      write_buf(buf, "\t\t};\n");
      return true;
  }
  
  static bool
  write_action(struct xkb_keymap *keymap, struct buf *buf,
               const union xkb_action *action,
               const char *prefix, const char *suffix)
  {
      const char *type;
      const char *args = NULL;
  
      if (!prefix)
          prefix = "";
      if (!suffix)
          suffix = "";
  
      type = ActionTypeText(action->type);
  
      switch (action->type) {
      case ACTION_TYPE_MOD_SET:
      case ACTION_TYPE_MOD_LATCH:
      case ACTION_TYPE_MOD_LOCK:
          if (action->mods.flags & ACTION_MODS_LOOKUP_MODMAP)
              args = "modMapMods";
          else
              args = ModMaskText(keymap, action->mods.mods.mods);
          write_buf(buf, "%s%s(modifiers=%s%s%s)%s", prefix, type, args,
                    (action->type != ACTION_TYPE_MOD_LOCK &&
                     (action->mods.flags & ACTION_LOCK_CLEAR)) ?
                     ",clearLocks" : "",
                    (action->type != ACTION_TYPE_MOD_LOCK &&
                     (action->mods.flags & ACTION_LATCH_TO_LOCK)) ?
                     ",latchToLock" : "",
                    suffix);
          break;
  
      case ACTION_TYPE_GROUP_SET:
      case ACTION_TYPE_GROUP_LATCH:
      case ACTION_TYPE_GROUP_LOCK:
          write_buf(buf, "%s%s(group=%s%d%s%s)%s", prefix, type,
                    (!(action->group.flags & ACTION_ABSOLUTE_SWITCH) &&
                     action->group.group > 0) ? "+" : "",
                    (action->group.flags & ACTION_ABSOLUTE_SWITCH) ?
                    action->group.group + 1 : action->group.group,
                    (action->type != ACTION_TYPE_GROUP_LOCK &&
                     (action->group.flags & ACTION_LOCK_CLEAR)) ?
                    ",clearLocks" : "",
                    (action->type != ACTION_TYPE_GROUP_LOCK &&
                     (action->group.flags & ACTION_LATCH_TO_LOCK)) ?
                    ",latchToLock" : "",
                    suffix);
          break;
  
      case ACTION_TYPE_TERMINATE:
          write_buf(buf, "%s%s()%s", prefix, type, suffix);
          break;
  
      case ACTION_TYPE_PTR_MOVE:
          write_buf(buf, "%s%s(x=%s%d,y=%s%d%s)%s", prefix, type,
                    (!(action->ptr.flags & ACTION_ABSOLUTE_X) &&
                     action->ptr.x >= 0) ? "+" : "",
                    action->ptr.x,
                    (!(action->ptr.flags & ACTION_ABSOLUTE_Y) &&
                     action->ptr.y >= 0) ? "+" : "",
                    action->ptr.y,
                    (action->ptr.flags & ACTION_NO_ACCEL) ? ",!accel" : "",
                    suffix);
          break;
  
      case ACTION_TYPE_PTR_LOCK:
          switch (action->btn.flags &
                   (ACTION_LOCK_NO_LOCK | ACTION_LOCK_NO_UNLOCK)) {
          case ACTION_LOCK_NO_UNLOCK:
              args = ",affect=lock";
              break;
  
          case ACTION_LOCK_NO_LOCK:
              args = ",affect=unlock";
              break;
  
          case ACTION_LOCK_NO_LOCK | ACTION_LOCK_NO_UNLOCK:
              args = ",affect=neither";
              break;
  
          default:
              args = ",affect=both";
              break;
          }
      case ACTION_TYPE_PTR_BUTTON:
          write_buf(buf, "%s%s(button=", prefix, type);
          if (action->btn.button > 0 && action->btn.button <= 5)
              write_buf(buf, "%d", action->btn.button);
          else
              write_buf(buf, "default");
          if (action->btn.count)
              write_buf(buf, ",count=%d", action->btn.count);
          if (args)
              write_buf(buf, "%s", args);
          write_buf(buf, ")%s", suffix);
          break;
  
      case ACTION_TYPE_PTR_DEFAULT:
          write_buf(buf, "%s%s(", prefix, type);
          write_buf(buf, "affect=button,button=%s%d",
                    (!(action->dflt.flags & ACTION_ABSOLUTE_SWITCH) &&
                     action->dflt.value >= 0) ? "+" : "",
                    action->dflt.value);
          write_buf(buf, ")%s", suffix);
          break;
  
      case ACTION_TYPE_SWITCH_VT:
          write_buf(buf, "%s%s(screen=%s%d,%ssame)%s", prefix, type,
                    (!(action->screen.flags & ACTION_ABSOLUTE_SWITCH) &&
                     action->screen.screen >= 0) ? "+" : "",
                    action->screen.screen,
                    (action->screen.flags & ACTION_SAME_SCREEN) ? "!" : "",
                    suffix);
          break;
  
      case ACTION_TYPE_CTRL_SET:
      case ACTION_TYPE_CTRL_LOCK:
          write_buf(buf, "%s%s(controls=%s)%s", prefix, type,
                    ControlMaskText(keymap->ctx, action->ctrls.ctrls), suffix);
          break;
  
      case ACTION_TYPE_NONE:
          write_buf(buf, "%sNoAction()%s", prefix, suffix);
          break;
  
      default:
          write_buf(buf,
                    "%s%s(type=0x%02x,data[0]=0x%02x,data[1]=0x%02x,data[2]=0x%02x,data[3]=0x%02x,data[4]=0x%02x,data[5]=0x%02x,data[6]=0x%02x)%s",
                    prefix, type, action->type, action->priv.data[0],
                    action->priv.data[1], action->priv.data[2],
                    action->priv.data[3], action->priv.data[4],
                    action->priv.data[5], action->priv.data[6],
                    suffix);
          break;
      }
  
      return true;
  }
  
  static bool
  write_compat(struct xkb_keymap *keymap, struct buf *buf)
  {
      struct xkb_sym_interpret *interp;
      const struct xkb_indicator_map *led;
  
      if (keymap->compat_section_name)
          write_buf(buf, "\txkb_compatibility \"%s\" {\n\n",
                    keymap->compat_section_name);
      else
          write_buf(buf, "\txkb_compatibility {\n\n");
  
      write_vmods(keymap, buf);
  
      write_buf(buf, "\t\tinterpret.useModMapMods= AnyLevel;\n");
      write_buf(buf, "\t\tinterpret.repeat= False;\n");
  
      darray_foreach(interp, keymap->sym_interprets) {
          char keysym_name[64];
  
          if (interp->sym == XKB_KEY_NoSymbol)
              sprintf(keysym_name, "Any");
          else
              xkb_keysym_get_name(interp->sym, keysym_name, sizeof(keysym_name));
  
          write_buf(buf, "\t\tinterpret %s+%s(%s) {\n",
                    keysym_name,
                    SIMatchText(interp->match),
                    ModMaskText(keymap, interp->mods));
  
          if (interp->virtual_mod != XKB_MOD_INVALID)
              write_buf(buf, "\t\t\tvirtualModifier= %s;\n",
                        ModIndexText(keymap, interp->virtual_mod));
  
          if (interp->level_one_only)
              write_buf(buf, "\t\t\tuseModMapMods=level1;\n");
          if (interp->repeat)
              write_buf(buf, "\t\t\trepeat= True;\n");
  
          write_action(keymap, buf, &interp->action, "\t\t\taction= ", ";\n");
          write_buf(buf, "\t\t};\n");
      }
  
      darray_foreach(led, keymap->indicators)
          if (led->which_groups || led->groups || led->which_mods ||
              led->mods.mods || led->ctrls)
              write_indicator_map(keymap, buf, led);
  
      write_buf(buf, "\t};\n\n");
  
      return true;
  }
  
  static bool
  write_keysyms(struct xkb_keymap *keymap, struct buf *buf,
                struct xkb_key *key, xkb_layout_index_t group)
  {
      const xkb_keysym_t *syms;
      int num_syms;
      xkb_level_index_t level;
  #define OUT_BUF_LEN 128
      char out_buf[OUT_BUF_LEN];
  
      for (level = 0; level < XkbKeyGroupWidth(key, group); level++) {
          if (level != 0)
              write_buf(buf, ", ");
          num_syms = xkb_keymap_key_get_syms_by_level(keymap, key->keycode,
                                                      group, level, &syms);
          if (num_syms == 0) {
              write_buf(buf, "%15s", "NoSymbol");
          }
          else if (num_syms == 1) {
              xkb_keysym_get_name(syms[0], out_buf, OUT_BUF_LEN);
              write_buf(buf, "%15s", out_buf);
          }
          else {
              int s;
              write_buf(buf, "{ ");
              for (s = 0; s < num_syms; s++) {
                  if (s != 0)
                      write_buf(buf, ", ");
                  xkb_keysym_get_name(syms[s], out_buf, OUT_BUF_LEN);
                  write_buf(buf, "%s", out_buf);
              }
              write_buf(buf, " }");
          }
      }
  #undef OUT_BUF_LEN
  
      return true;
  }
  
  static bool
  write_symbols(struct xkb_keymap *keymap, struct buf *buf)
  {
      struct xkb_key *key;
      xkb_layout_index_t group, tmp;
      xkb_atom_t *group_name;
      bool showActions;
  
      if (keymap->symbols_section_name)
          write_buf(buf, "\txkb_symbols \"%s\" {\n\n",
                    keymap->symbols_section_name);
      else
          write_buf(buf, "\txkb_symbols {\n\n");
  
      tmp = 0;
      darray_enumerate(group, group_name, keymap->group_names) {
          if (!*group_name)
              continue;
          write_buf(buf,
                    "\t\tname[group%d]=\"%s\";\n", group + 1,
                    xkb_atom_text(keymap->ctx, *group_name));
          tmp++;
      }
      if (tmp > 0)
          write_buf(buf, "\n");
  
      xkb_foreach_key(key, keymap) {
          bool simple = true;
          bool explicit_types = false;
          bool multi_type = false;
  
          if (key->num_groups == 0)
              continue;
  
          write_buf(buf, "\t\tkey %-20s {", KeyNameText(keymap->ctx, key->name));
  
          for (group = 0; group < key->num_groups; group++) {
              if (key->groups[group].explicit_type)
                  explicit_types = true;
  
              if (group != 0 && key->groups[group].type != key->groups[0].type)
                  multi_type = true;
          }
  
          if (explicit_types) {
              const struct xkb_key_type *type;
              simple = false;
  
              if (multi_type) {
                  for (group = 0; group < key->num_groups; group++) {
                      if (!key->groups[group].explicit_type)
                          continue;
  
                      type = key->groups[group].type;
                      write_buf(buf, "\n\t\t\ttype[group%u]= \"%s\",",
                                group + 1,
                                xkb_atom_text(keymap->ctx, type->name));
                  }
              }
              else {
                  type = key->groups[0].type;
                  write_buf(buf, "\n\t\t\ttype= \"%s\",",
                            xkb_atom_text(keymap->ctx, type->name));
              }
          }
  
          if (key->explicit & EXPLICIT_REPEAT) {
              if (key->repeats)
                  write_buf(buf, "\n\t\t\trepeat= Yes,");
              else
                  write_buf(buf, "\n\t\t\trepeat= No,");
              simple = false;
          }
  
          if (key->vmodmap && (key->explicit & EXPLICIT_VMODMAP))
              write_buf(buf, "\n\t\t\tvirtualMods= %s,",
                        ModMaskText(keymap, key->vmodmap));
  
          switch (key->out_of_range_group_action) {
          case RANGE_SATURATE:
              write_buf(buf, "\n\t\t\tgroupsClamp,");
              break;
  
          case RANGE_REDIRECT:
              write_buf(buf, "\n\t\t\tgroupsRedirect= Group%u,",
                        key->out_of_range_group_number + 1);
              break;
  
          default:
              break;
          }
  
          showActions = !!(key->explicit & EXPLICIT_INTERP);
  
          if (key->num_groups > 1 || showActions)
              simple = false;
  
          if (simple) {
              write_buf(buf, "\t[ ");
              if (!write_keysyms(keymap, buf, key, 0))
                  return false;
              write_buf(buf, " ] };\n");
          }
          else {
              xkb_level_index_t level;
  
              for (group = 0; group < key->num_groups; group++) {
                  if (group != 0)
                      write_buf(buf, ",");
                  write_buf(buf, "\n\t\t\tsymbols[Group%u]= [ ", group + 1);
                  if (!write_keysyms(keymap, buf, key, group))
                      return false;
                  write_buf(buf, " ]");
                  if (showActions) {
                      write_buf(buf, ",\n\t\t\tactions[Group%u]= [ ",
                                group + 1);
                      for (level = 0;
                           level < XkbKeyGroupWidth(key, group); level++) {
                          if (level != 0)
                              write_buf(buf, ", ");
                          write_action(keymap, buf,
                                       &key->groups[group].levels[level].action,
                                       NULL, NULL);
                      }
                      write_buf(buf, " ]");
                  }
              }
              write_buf(buf, "\n\t\t};\n");
          }
      }
  
      xkb_foreach_key(key, keymap) {
          xkb_mod_index_t i;
          const struct xkb_mod *mod;
  
          if (key->modmap == 0)
              continue;
  
          darray_enumerate(i, mod, keymap->mods) {
              if (!(key->modmap & (1 << i)))
                  continue;
  
              write_buf(buf, "\t\tmodifier_map %s { %s };\n",
                        xkb_atom_text(keymap->ctx, mod->name),
                        KeyNameText(keymap->ctx, key->name));
          }
      }
  
      write_buf(buf, "\t};\n\n");
      return true;
  }
  
  XKB_EXPORT char *
  xkb_keymap_get_as_string(struct xkb_keymap *keymap,
                           enum xkb_keymap_format format)
  {
      bool ok;
      struct buf buf = { NULL, 0, 0 };
  
      if (format == XKB_KEYMAP_USE_ORIGINAL_FORMAT)
          format = keymap->format;
  
      if (format != XKB_KEYMAP_FORMAT_TEXT_V1) {
          log_err(keymap->ctx,
                  "Trying to get a keymap as a string in an unsupported format (%d)\n",
                  format);
          return NULL;
      }
  
      ok = (check_write_buf(&buf, "xkb_keymap {\n") &&
            write_keycodes(keymap, &buf) &&
            write_types(keymap, &buf) &&
            write_compat(keymap, &buf) &&
            write_symbols(keymap, &buf) &&
            check_write_buf(&buf, "};\n"));
  
      return (ok ? buf.buf : NULL);
  }