Compose: add iterator API

[platform/upstream/libxkbcommon.git] / src / darray.h

diff --git a/src/darray.h b/src/darray.h
index e44b2e7..b75d85f 100644 (file)
--- a/src/darray.h
+++ b/src/darray.h
@@ -23,7 +23,7 @@
 #ifndef CCAN_DARRAY_H
 #define CCAN_DARRAY_H
 
-/* Originally taken from: http://ccodearchive.net/info/darray.html
+/* Originally taken from: https://ccodearchive.net/info/darray.html
  * But modified for libxkbcommon. */
 
 #include <stdlib.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) ***/
 
@@ -98,12 +104,21 @@ typedef darray (unsigned long)  darray_ulong;
 #define darray_from_items(arr, items, count) do { \
     unsigned __count = (count); \
     darray_resize(arr, __count); \
-    memcpy((arr).item, items, __count * sizeof(*(arr).item)); \
+    if (__count != 0) \
+        memcpy((arr).item, items, __count * sizeof(*(arr).item)); \
 } while (0)
 
 #define darray_copy(arr_to, arr_from) \
     darray_from_items((arr_to), (arr_from).item, (arr_from).size)
 
+#define darray_concat(arr_to, arr_from) \
+    darray_append_items((arr_to), (arr_from).item, (arr_from).size)
+
+/*** Removal ***/
+
+/* Warning: Do not call darray_remove_last on an empty darray. */
+#define darray_remove_last(arr) (--(arr).size)
+
 /*** String buffer ***/
 
 #define darray_append_string(arr, str) do { \
@@ -156,8 +171,14 @@ typedef darray (unsigned long)  darray_ulong;
 #define darray_growalloc(arr, need)   do { \
     unsigned __need = (need); \
     if (__need > (arr).alloc) \
-    darray_realloc(arr, darray_next_alloc((arr).alloc, __need, \
-                                          sizeof(*(arr).item))); \
+        darray_realloc(arr, darray_next_alloc((arr).alloc, __need, \
+                                              sizeof(*(arr).item))); \
+} while (0)
+
+#define darray_shrink(arr) do { \
+    if ((arr).size > 0) \
+        (arr).item = realloc((arr).item, \
+                             ((arr).alloc = (arr).size) * sizeof(*(arr).item)); \
 } while (0)
 
 static inline unsigned
@@ -191,6 +212,6 @@ darray_next_alloc(unsigned alloc, unsigned need, unsigned itemSize)
          (idx)++, (val)++)
 
 #define darray_foreach_reverse(i, arr) \
-    for ((i) = &(arr).item[(arr).size]; (i)-- > &(arr).item[0]; )
+    for ((i) = &(arr).item[(arr).size - 1]; (arr).size > 0 && (i) >= &(arr).item[0]; (i)--)
 
 #endif /* CCAN_DARRAY_H */