htable: add htable_copy.

[ccan] / ccan / tal / tal.h

diff --git a/ccan/tal/tal.h b/ccan/tal/tal.h
index 86b56d35a3c26280a9915216a5443ebef78626e1..0cfea98446245ef3c0d9eb6882c4acf734e6cd83 100644 (file)
--- a/ccan/tal/tal.h
+++ b/ccan/tal/tal.h
@@ -110,7 +110,22 @@ void *tal_free(const tal_t *p);
  *     tal_resize(&p, 100);
  */
 #define tal_resize(p, count) \
-       tal_resize_((void **)(p), sizeof**(p), (count))
+       tal_resize_((void **)(p), sizeof**(p), (count), false)
+
+/**
+ * tal_resizez - enlarge or reduce a tal_arr[z]; zero out extra.
+ * @p: A pointer to the tal allocated array to resize.
+ * @count: the number to allocate.
+ *
+ * This returns true on success (and may move *@p), or false on failure.
+ * If @p has a length property, it is updated on success.
+ * On expand, new elements are memset to 0 bytes.
+ *
+ * Example:
+ *     tal_resizez(&p, 200);
+ */
+#define tal_resizez(p, count) \
+       tal_resize_((void **)(p), sizeof**(p), (count), true)
 
 /**
  * tal_steal - change the parent of a tal-allocated pointer.
@@ -274,14 +289,25 @@ tal_t *tal_next(const tal_t *root, const tal_t *prev);
 tal_t *tal_parent(const tal_t *ctx);
 
 /**
- * tal_dup - duplicate an array.
+ * tal_dup - duplicate an object.
+ * @ctx: The tal allocated object to be parent of the result (may be NULL).
+ * @type: the type (should match type of @p!)
+ * @p: the object to copy (or reparented if take())
+ */
+#define tal_dup(ctx, type, p)                  \
+       ((type *)tal_dup_((ctx), tal_typechk_(p, type *),       \
+                         sizeof(type), 1, 0,                   \
+                         false, TAL_LABEL(type, "")))
+
+/**
+ * tal_dup_arr - duplicate an array.
  * @ctx: The tal allocated object to be parent of the result (may be NULL).
  * @type: the type (should match type of @p!)
  * @p: the array to copy (or resized & reparented if take())
  * @n: the number of sizeof(type) entries to copy.
  * @extra: the number of extra sizeof(type) entries to allocate.
  */
-#define tal_dup(ctx, type, p, n, extra)                                \
+#define tal_dup_arr(ctx, type, p, n, extra)                    \
        ((type *)tal_dup_((ctx), tal_typechk_(p, type *),       \
                          sizeof(type), (n), (extra),           \
                          true, TAL_LABEL(type, "[]")))
@@ -340,13 +366,16 @@ void tal_cleanup(void);
 
 
 /**
- * tal_check - set the allocation or error functions to use
+ * tal_check - sanity check a tal context and its children.
  * @ctx: a tal context, or NULL.
  * @errorstr: a string to prepend calls to error_fn, or NULL.
  *
  * This sanity-checks a tal tree (unless NDEBUG is defined, in which case
  * it simply returns true).  If errorstr is not null, error_fn is called
  * when a problem is found, otherwise it is not.
+ *
+ * See also:
+ *     tal_set_backend()
  */
 bool tal_check(const tal_t *ctx, const char *errorstr);
 
@@ -406,7 +435,7 @@ void *tal_dup_(const tal_t *ctx, const void *p, size_t size,
 
 tal_t *tal_steal_(const tal_t *new_parent, const tal_t *t);
 
-bool tal_resize_(tal_t **ctxp, size_t size, size_t count);
+bool tal_resize_(tal_t **ctxp, size_t size, size_t count, bool clear);
 bool tal_expand_(tal_t **ctxp, const void *src, size_t size, size_t count);
 
 bool tal_add_destructor_(const tal_t *ctx, void (*destroy)(void *me));