From 48db59fab785ce881e154d83115de86d284fce5d Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 8 Oct 2012 11:24:12 +0000 Subject: move library packages to package/libs/ SVN-Revision: 33657 --- package/libs/libnl-tiny/src/object.c | 279 +++++++++++++++++++++++++++++++++++ 1 file changed, 279 insertions(+) create mode 100644 package/libs/libnl-tiny/src/object.c (limited to 'package/libs/libnl-tiny/src/object.c') diff --git a/package/libs/libnl-tiny/src/object.c b/package/libs/libnl-tiny/src/object.c new file mode 100644 index 0000000000..f91555137d --- /dev/null +++ b/package/libs/libnl-tiny/src/object.c @@ -0,0 +1,279 @@ +/* + * lib/object.c Generic Cacheable Object + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf + */ + +/** + * @ingroup cache + * @defgroup object Object + * @{ + */ + +#include +#include +#include +#include +#include + +static inline struct nl_object_ops *obj_ops(struct nl_object *obj) +{ + if (!obj->ce_ops) + BUG(); + + return obj->ce_ops; +} + +/** + * @name Object Creation/Deletion + * @{ + */ + +/** + * Allocate a new object of kind specified by the operations handle + * @arg ops cache operations handle + * @return The new object or NULL + */ +struct nl_object *nl_object_alloc(struct nl_object_ops *ops) +{ + struct nl_object *new; + + if (ops->oo_size < sizeof(*new)) + BUG(); + + new = calloc(1, ops->oo_size); + if (!new) + return NULL; + + new->ce_refcnt = 1; + nl_init_list_head(&new->ce_list); + + new->ce_ops = ops; + if (ops->oo_constructor) + ops->oo_constructor(new); + + NL_DBG(4, "Allocated new object %p\n", new); + + return new; +} + +#ifdef disabled +/** + * Allocate a new object of kind specified by the name + * @arg kind name of object type + * @return The new object or nULL + */ +int nl_object_alloc_name(const char *kind, struct nl_object **result) +{ + struct nl_cache_ops *ops; + + ops = nl_cache_ops_lookup(kind); + if (!ops) + return -NLE_OPNOTSUPP; + + if (!(*result = nl_object_alloc(ops->co_obj_ops))) + return -NLE_NOMEM; + + return 0; +} +#endif + +struct nl_derived_object { + NLHDR_COMMON + char data; +}; + +/** + * Allocate a new object and copy all data from an existing object + * @arg obj object to inherite data from + * @return The new object or NULL. + */ +struct nl_object *nl_object_clone(struct nl_object *obj) +{ + struct nl_object *new; + struct nl_object_ops *ops = obj_ops(obj); + int doff = offsetof(struct nl_derived_object, data); + int size; + + new = nl_object_alloc(ops); + if (!new) + return NULL; + + size = ops->oo_size - doff; + if (size < 0) + BUG(); + + new->ce_ops = obj->ce_ops; + new->ce_msgtype = obj->ce_msgtype; + + if (size) + memcpy((void *)new + doff, (void *)obj + doff, size); + + if (ops->oo_clone) { + if (ops->oo_clone(new, obj) < 0) { + nl_object_free(new); + return NULL; + } + } else if (size && ops->oo_free_data) + BUG(); + + return new; +} + +/** + * Free a cacheable object + * @arg obj object to free + * + * @return 0 or a negative error code. + */ +void nl_object_free(struct nl_object *obj) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (obj->ce_refcnt > 0) + NL_DBG(1, "Warning: Freeing object in use...\n"); + + if (obj->ce_cache) + nl_cache_remove(obj); + + if (ops->oo_free_data) + ops->oo_free_data(obj); + + free(obj); + + NL_DBG(4, "Freed object %p\n", obj); +} + +/** @} */ + +/** + * @name Reference Management + * @{ + */ + +/** @} */ + +/** + * @name Utillities + * @{ + */ + +#ifdef disabled +/** + * Dump this object according to the specified parameters + * @arg obj object to dump + * @arg params dumping parameters + */ +void nl_object_dump(struct nl_object *obj, struct nl_dump_params *params) +{ + dump_from_ops(obj, params); +} + +/** + * Check if the identifiers of two objects are identical + * @arg a an object + * @arg b another object of same type + * + * @return true if both objects have equal identifiers, otherwise false. + */ +int nl_object_identical(struct nl_object *a, struct nl_object *b) +{ + struct nl_object_ops *ops = obj_ops(a); + int req_attrs; + + /* Both objects must be of same type */ + if (ops != obj_ops(b)) + return 0; + + req_attrs = ops->oo_id_attrs; + + /* Both objects must provide all required attributes to uniquely + * identify an object */ + if ((a->ce_mask & req_attrs) != req_attrs || + (b->ce_mask & req_attrs) != req_attrs) + return 0; + + /* Can't judge unless we can compare */ + if (ops->oo_compare == NULL) + return 0; + + return !(ops->oo_compare(a, b, req_attrs, 0)); +} + +/** + * Compute bitmask representing difference in attribute values + * @arg a an object + * @arg b another object of same type + * + * The bitmask returned is specific to an object type, each bit set represents + * an attribute which mismatches in either of the two objects. Unavailability + * of an attribute in one object and presence in the other is regarded a + * mismatch as well. + * + * @return Bitmask describing differences or 0 if they are completely identical. + */ +uint32_t nl_object_diff(struct nl_object *a, struct nl_object *b) +{ + struct nl_object_ops *ops = obj_ops(a); + + if (ops != obj_ops(b) || ops->oo_compare == NULL) + return UINT_MAX; + + return ops->oo_compare(a, b, ~0, 0); +} + +/** + * Match a filter against an object + * @arg obj object to check + * @arg filter object of same type acting as filter + * + * @return 1 if the object matches the filter or 0 + * if no filter procedure is available or if the + * filter does not match. + */ +int nl_object_match_filter(struct nl_object *obj, struct nl_object *filter) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (ops != obj_ops(filter) || ops->oo_compare == NULL) + return 0; + + return !(ops->oo_compare(obj, filter, filter->ce_mask, + LOOSE_COMPARISON)); +} + +/** + * Convert bitmask of attributes to a character string + * @arg obj object of same type as attribute bitmask + * @arg attrs bitmask of attribute types + * @arg buf destination buffer + * @arg len length of destination buffer + * + * Converts the bitmask of attribute types into a list of attribute + * names separated by comas. + * + * @return destination buffer. + */ +char *nl_object_attrs2str(struct nl_object *obj, uint32_t attrs, + char *buf, size_t len) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (ops->oo_attrs2str != NULL) + return ops->oo_attrs2str(attrs, buf, len); + else { + memset(buf, 0, len); + return buf; + } +} + +#endif + +/** @} */ + +/** @} */ -- cgit v1.2.3