*/
typedef void tal_t;
-/**
- * TAL_TAKE - fake tal_t to indicate function will own arguments.
- *
- * Various functions take a context on which to allocate: if you use
- * TAL_TAKE there instead, it means that the argument(s) are actually
- * tal objects. The returned value will share the same parent; it may
- * even be the same pointer as the arguments. The arguments themselves
- * will be reused, freed, or made a child of the return value: they are
- * no longer valid for external use.
- */
-#define TAL_TAKE ((tal_t *)-2L)
-
/**
* tal - basic allocator function
* @ctx: NULL, or tal allocated object to be parent.
* @p: NULL, or tal allocated object to free.
*
* This calls the destructors for p (if any), then does the same for all its
- * children (recursively) before finally freeing the memory.
+ * children (recursively) before finally freeing the memory. It returns
+ * NULL, for convenience.
*
* Note: errno is preserved by this call.
*
* Example:
- * tal_free(p);
+ * p = tal_free(p);
*/
-void tal_free(const tal_t *p);
+void *tal_free(const tal_t *p);
/**
* tal_arr - allocate an array of objects.
*
* This may need to perform an allocation, in which case it may fail; thus
* it can return NULL, otherwise returns @ptr.
- *
- * Note: weird macro avoids gcc's 'warning: value computed is not used'.
*/
#if HAVE_STATEMENT_EXPR
+/* Weird macro avoids gcc's 'warning: value computed is not used'. */
#define tal_steal(ctx, ptr) \
({ (tal_typeof(ptr) tal_steal_((ctx),(ptr))); })
#else
tal_t *tal_parent(const tal_t *ctx);
/**
- * tal_memdup - duplicate memory.
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the memory to copy
- * @n: the number of bytes.
- *
+ * tal_dup - 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.
*/
-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
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the string to copy
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @p: the string to copy (can be take()).
*/
char *tal_strdup(const tal_t *ctx, const char *p);
/**
* tal_strndup - duplicate a limited amount of a string.
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the string to copy
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @p: the string to copy (can be take()).
* @n: the maximum length to copy.
*
* Always gives a nul-terminated string, with strlen() <= @n.
/**
* tal_asprintf - allocate a formatted string
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @fmt: the printf-style format.
- *
- * If @ctx is TAL_TAKE, @fmt is freed and its parent will be the parent
- * of the return value.
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @fmt: the printf-style format (can be take()).
*/
char *tal_asprintf(const tal_t *ctx, const char *fmt, ...) PRINTF_FMT(2,3);
/**
* tal_vasprintf - allocate a formatted string (va_list version)
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @fmt: the printf-style format.
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @fmt: the printf-style format (can be take()).
* @va: the va_list containing the format args.
- *
- * If @ctx is TAL_TAKE, @fmt is freed and its parent will be the parent
- * of the return value.
*/
char *tal_vasprintf(const tal_t *ctx, const char *fmt, va_list ap)
PRINTF_FMT(2,0);
#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)+0) _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);
bool tal_resize_(tal_t **ctxp, size_t size);