kc3-lang/libxkbcommon/src/xkbcomp/vmod.c

Branch : - branch - android master - tag -

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• Author : Pierre Le Marre
  Date : 2025-02-11 17:34:27
  Hash : 558447d8
  Message : xkbcomp: Explicit vars initialization The `Resolve*` functions do not always initialize the parameters that they can modify, so it is safer to always initialize them at the call site.

• src/xkbcomp/vmod.c

• /*
   * Copyright (c) 1994 by Silicon Graphics Computer Systems, Inc.
   * SPDX-License-Identifier: HPND
   */
  
  #include "config.h"
  
  #include "xkbcomp-priv.h"
  #include "text.h"
  #include "expr.h"
  #include "vmod.h"
  
  bool
  HandleVModDef(struct xkb_context *ctx, struct xkb_mod_set *mods,
                VModDef *stmt, enum merge_mode merge)
  {
      xkb_mod_mask_t mapping = 0;
      if (stmt->value) {
          /*
           * This is a statement such as 'virtualModifiers NumLock = Mod1';
           * it sets the vmod-to-real-mod[s] mapping directly instead of going
           * through modifier_map or some such.
           */
          if (!ExprResolveModMask(ctx, stmt->value, MOD_REAL, mods, &mapping)) {
              log_err(ctx, XKB_LOG_MESSAGE_NO_ID,
                      "Declaration of %s ignored\n",
                      xkb_atom_text(ctx, stmt->name));
              return false;
          }
      }
  
      merge = (merge == MERGE_DEFAULT ? stmt->merge : merge);
      xkb_mod_index_t i;
      struct xkb_mod *mod;
      xkb_mods_enumerate(i, mod, mods) {
          if (mod->name == stmt->name) {
              if (mod->type != MOD_VIRT) {
                  log_err(ctx, XKB_LOG_MESSAGE_NO_ID,
                          "Can't add a virtual modifier named \"%s\"; "
                          "there is already a non-virtual modifier with this name! Ignored\n",
                          xkb_atom_text(ctx, mod->name));
                  return false;
              }
  
              if (mod->mapping == mapping || !stmt->value) {
                  /*
                   * Same definition or no new explicit mapping: do nothing.
                   * Note that we must test the statement value and not the mapping
                   * in order to allow resetting it: e.g. `VMod=none`.
                   */
                  return true;
              }
  
              const xkb_mod_mask_t vmod = UINT32_C(1) << i;
              if (mods->explicit_vmods & vmod) {
                  /* Handle conflicting mappings */
                  assert(mod->mapping != 0);
                  const bool clobber = (merge != MERGE_AUGMENT);
                  const xkb_mod_mask_t use = (clobber ? mapping : mod->mapping);
                  const xkb_mod_mask_t ignore = (clobber ? mod->mapping : mapping);
  
                  log_warn(ctx, XKB_LOG_MESSAGE_NO_ID,
                           "Virtual modifier %s defined multiple times; "
                           "Using %s, ignoring %s\n",
                           xkb_atom_text(ctx, stmt->name),
                           ModMaskText(ctx, mods, use),
                           ModMaskText(ctx, mods, ignore));
  
                  mapping = use;
              }
  
              mod->mapping = mapping;
              if (mapping) {
                  mods->explicit_vmods |= vmod;
              } else {
                  mods->explicit_vmods &= ~vmod;
              }
  
              return true;
          }
      }
  
      if (mods->num_mods >= XKB_MAX_MODS) {
          log_err(ctx, XKB_LOG_MESSAGE_NO_ID,
                  "Too many modifiers defined (maximum %d)\n",
                  XKB_MAX_MODS);
          return false;
      }
  
      mods->mods[mods->num_mods].name = stmt->name;
      mods->mods[mods->num_mods].type = MOD_VIRT;
      mods->mods[mods->num_mods].mapping = mapping;
      if (mapping)
          mods->explicit_vmods |= UINT32_C(1) << mods->num_mods;
      mods->num_mods++;
      return true;
  }