Replace darray_mem with a new darray_steal

That's a more declarative interface.

Signed-off-by: Ran Benita <ran234@gmail.com>

src/darray.h

@@ -44,6 +44,13 @@
     darray_init(arr); \
 } while (0)
 
+#define darray_steal(arr, to, to_size) do { \
+    *(to) = (arr).item; \
+    if (to_size) \
+        *(unsigned int *) (to_size) = (arr).size; \
+    darray_init(arr); \
+} while (0)
+
 /*
  * Typedefs for darrays of common types.  These are useful
  * when you want to pass a pointer to an darray(T) around.
@@ -78,7 +85,6 @@ typedef darray (unsigned long)  darray_ulong;
 #define darray_item(arr, i)     ((arr).item[i])
 #define darray_size(arr)        ((arr).size)
 #define darray_empty(arr)       ((arr).size == 0)
-#define darray_mem(arr, offset) ((arr).item + (offset))
 
 /*** Insertion (single item) ***/
 

src/xkbcomp/ast-build.c

@@ -226,15 +226,15 @@ ExprAppendKeysymList(ExprDef *expr, xkb_keysym_t sym)
 ExprDef *
 ExprAppendMultiKeysymList(ExprDef *expr, ExprDef *append)
 {
+    xkb_keysym_t *syms;
     unsigned nSyms = darray_size(expr->keysym_list.syms);
     unsigned numEntries = darray_size(append->keysym_list.syms);
 
     darray_append(expr->keysym_list.symsMapIndex, nSyms);
     darray_append(expr->keysym_list.symsNumEntries, numEntries);
-    darray_append_items(expr->keysym_list.syms,
-                        darray_mem(append->keysym_list.syms, 0), numEntries);
+    darray_steal(append->keysym_list.syms, &syms, NULL);
+    darray_append_items(expr->keysym_list.syms, syms, numEntries);
 
-    darray_resize(append->keysym_list.syms, 0);
     FreeStmt((ParseCommon *) &append);
 
     return expr;

src/xkbcomp/compat.c

@@ -890,8 +890,8 @@ CopyCompatToKeymap(struct xkb_keymap *keymap, CompatInfo *info)
         CopyInterps(info, false, MATCH_ANY, &collect);
         CopyInterps(info, false, MATCH_ANY_OR_NONE, &collect);
 
-        keymap->num_sym_interprets = darray_size(collect.sym_interprets);
-        keymap->sym_interprets = darray_mem(collect.sym_interprets, 0);
+        darray_steal(collect.sym_interprets,
+                     &keymap->sym_interprets, &keymap->num_sym_interprets);
     }
 
     CopyLedMapDefsToKeymap(keymap, info);

src/xkbcomp/rules.c

@@ -946,14 +946,11 @@ finish:
         darray_empty(m->kccgst[KCCGST_SYMBOLS]))
         goto error;
 
-    out->keycodes = darray_mem(m->kccgst[KCCGST_KEYCODES], 0);
-    out->types = darray_mem(m->kccgst[KCCGST_TYPES], 0);
-    out->compat = darray_mem(m->kccgst[KCCGST_COMPAT], 0);
-    /* out->geometry = darray_mem(m->kccgst[KCCGST_GEOMETRY], 0); */
+    darray_steal(m->kccgst[KCCGST_KEYCODES], &out->keycodes, NULL);
+    darray_steal(m->kccgst[KCCGST_TYPES], &out->types, NULL);
+    darray_steal(m->kccgst[KCCGST_COMPAT], &out->compat, NULL);
+    darray_steal(m->kccgst[KCCGST_SYMBOLS], &out->symbols, NULL);
     darray_free(m->kccgst[KCCGST_GEOMETRY]);
-    out->symbols = darray_mem(m->kccgst[KCCGST_SYMBOLS], 0);
-    for (int i = 0; i < _KCCGST_NUM_ENTRIES; i++)
-        darray_init(m->kccgst[i]);
 
     return true;
 

src/xkbcomp/symbols.c

@@ -1468,10 +1468,8 @@ CopySymbolsDefToKeymap(struct xkb_keymap *keymap, SymbolsInfo *info,
     }
 
     /* Copy levels. */
-    darray_enumerate(i, groupi, keyi->groups) {
-        key->groups[i].levels = darray_mem(groupi->levels, 0);
-        darray_init(groupi->levels);
-    }
+    darray_enumerate(i, groupi, keyi->groups)
+        darray_steal(groupi->levels, &key->groups[i].levels, NULL);
 
     key->out_of_range_group_number = keyi->out_of_range_group_number;
     key->out_of_range_group_action = keyi->out_of_range_group_action;
@@ -1540,9 +1538,8 @@ CopySymbolsToKeymap(struct xkb_keymap *keymap, SymbolsInfo *info)
 
     keymap->mods = info->mods;
 
-    keymap->num_group_names = darray_size(info->group_names);
-    keymap->group_names = darray_mem(info->group_names, 0);
-    darray_init(info->group_names);
+    darray_steal(info->group_names,
+                 &keymap->group_names, &keymap->num_group_names);
 
     darray_foreach(keyi, info->keys)
         if (!CopySymbolsDefToKeymap(keymap, info, keyi))

src/xkbcomp/types.c

@@ -700,14 +700,12 @@ CopyKeyTypesToKeymap(struct xkb_keymap *keymap, KeyTypesInfo *info)
             KeyTypeInfo *def = &darray_item(info->types, i);
             struct xkb_key_type *type = &types[i];
 
-            type->mods.mods = def->mods;
-            type->num_levels = def->num_levels;
-            type->entries = darray_mem(def->entries, 0);
-            type->num_entries = darray_size(def->entries);
-            darray_init(def->entries);
             type->name = def->name;
-            type->level_names = darray_mem(def->level_names, 0);
-            darray_init(def->level_names);
+            type->mods.mods = def->mods;
+            darray_steal(def->level_names,
+                         &type->level_names, &type->num_levels);
+            darray_steal(def->entries,
+                         &type->entries, &type->num_entries);
         }
     }