* Allocates a specific type, with a given parent context. The name
* of the object is a string of the type, but if CCAN_TAL_DEBUG is
* defined it also contains the file and line which allocated it.
+ *
+ * Example:
+ * int *p = tal(NULL, int);
+ * *p = 1;
*/
#define tal(ctx, type) \
((type *)tal_alloc_((ctx), sizeof(type), false, TAL_LABEL(type, "")))
* @type: the type to allocate.
*
* Equivalent to tal() followed by memset() to zero.
+ *
+ * Example:
+ * p = talz(NULL, int);
+ * assert(*p == 0);
*/
#define talz(ctx, type) \
((type *)tal_alloc_((ctx), sizeof(type), true, TAL_LABEL(type, "")))
*
* This calls the destructors for p (if any), then does the same for all its
* children (recursively) before finally freeing the memory.
+ *
+ * Note: errno is preserved by this call.
+ *
+ * Example:
+ * tal_free(p);
*/
void tal_free(const tal_t *p);
* @ctx: NULL, or tal allocated object to be parent.
* @type: the type to allocate.
* @count: the number to allocate.
+ *
+ * Example:
+ * p = tal_arr(NULL, int, 2);
+ * p[0] = 0;
+ * p[1] = 1;
*/
#define tal_arr(ctx, type, count) \
((type *)tal_alloc_((ctx), tal_sizeof_(sizeof(type), (count)), false, \
* @ctx: NULL, or tal allocated object to be parent.
* @type: the type to allocate.
* @count: the number to allocate.
+ *
+ * Example:
+ * p = tal_arrz(NULL, int, 2);
+ * assert(p[0] == 0 && p[1] == 0);
*/
#define tal_arrz(ctx, type, count) \
((type *)tal_alloc_((ctx), tal_sizeof_(sizeof(type), (count)), true, \
TAL_LABEL(type, "[]")))
/**
- * tal_resize - enlarge or reduce a tal_arr(z).
- * @p: The tal allocated array to resize.
+ * tal_resize - enlarge or reduce a tal_arr[z].
+ * @p: A pointer to the tal allocated array to resize.
* @count: the number to allocate.
*
- * This returns the new pointer, or NULL (and destroys the old one)
- * on failure.
+ * This returns true on success (and may move *@p), or false on failure.
+ *
+ * Example:
+ * tal_resize(&p, 100);
*/
#define tal_resize(p, count) \
- ((tal_typeof(p) tal_realloc_((p), tal_sizeof_(sizeof(*p), (count)))))
+ tal_resize_((void **)(p), tal_sizeof_(sizeof**(p), (count)))
/**
* tal_steal - change the parent of a tal-allocated pointer.
* This may need to perform an allocation, in which case it may fail; thus
* it can return NULL, otherwise returns @ptr.
*
- * Weird macro avoids gcc's 'warning: value computed is not used'.
+ * Note: weird macro avoids gcc's 'warning: value computed is not used'.
*/
#if HAVE_STATEMENT_EXPR
#define tal_steal(ctx, ptr) \
tal_t *tal_parent(const tal_t *ctx);
/**
- * tal_memdup - duplicate memory.
+ * tal_dup - duplicate an array.
* @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the memory to copy
- * @n: the number of bytes.
- *
+ * @type: the type (should match type of @p!)
+ * @p: the array to copy
+ * @n: the number of sizeof(type) entries to copy.
+ * @extra: the number of extra sizeof(type) entries to allocate.
*/
-void *tal_memdup(const tal_t *ctx, const void *p, size_t n);
+#define tal_dup(ctx, type, p, n, extra) \
+ ((type *)tal_dup_((ctx), tal_typechk_(p, type *), \
+ tal_sizeof_(sizeof(type), (n)), \
+ tal_sizeof_(sizeof(type), (extra)), \
+ TAL_LABEL(type, "[]")))
/**
* tal_strdup - duplicate a string
#if HAVE_TYPEOF
#define tal_typeof(ptr) (__typeof__(ptr))
+#if HAVE_STATEMENT_EXPR
+/* Careful: ptr can be const foo *, ptype is foo *. Also, ptr could
+ * be an array, eg "hello". */
+#define tal_typechk_(ptr, ptype) ({ __typeof__(&*(ptr)) _p = (ptype)(ptr); _p; })
#else
+#define tal_typechk_(ptr, ptype) (ptr)
+#endif
+#else /* !HAVE_TYPEOF */
#define tal_typeof(ptr)
+#define tal_typechk_(ptr, ptype) (ptr)
#endif
void *tal_alloc_(const tal_t *ctx, size_t bytes, bool clear, const char *label);
+void *tal_dup_(const tal_t *ctx, const void *p, size_t n, size_t extra,
+ const char *label);
+
tal_t *tal_steal_(const tal_t *new_parent, const tal_t *t);
-void *tal_realloc_(tal_t *ctx, size_t size);
+bool tal_resize_(tal_t **ctxp, size_t size);
bool tal_add_destructor_(tal_t *ctx, void (*destroy)(void *me));