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- /*
- * Portions Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
- * Portions Copyright (C) 2001 Internet Software Consortium.
- * Portions Copyright (C) 2001 Nominum, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
- /* $Id: symtab.h,v 1.3.18.2 2005/04/29 00:17:14 marka Exp $ */
-
- #ifndef ISCCC_SYMTAB_H
- #define ISCCC_SYMTAB_H 1
-
- /*****
- ***** Module Info
- *****/
-
- /*! \file
- * \brief
- * Provides a simple memory-based symbol table.
- *
- * Keys are C strings. A type may be specified when looking up,
- * defining, or undefining. A type value of 0 means "match any type";
- * any other value will only match the given type.
- *
- * It's possible that a client will attempt to define a <key, type,
- * value> tuple when a tuple with the given key and type already
- * exists in the table. What to do in this case is specified by the
- * client. Possible policies are:
- *
- *\li isccc_symexists_reject Disallow the define, returning #ISC_R_EXISTS
- *\li isccc_symexists_replace Replace the old value with the new. The
- * undefine action (if provided) will be called
- * with the old <key, type, value> tuple.
- *\li isccc_symexists_add Add the new tuple, leaving the old tuple in
- * the table. Subsequent lookups will retrieve
- * the most-recently-defined tuple.
- *
- * A lookup of a key using type 0 will return the most-recently
- * defined symbol with that key. An undefine of a key using type 0
- * will undefine the most-recently defined symbol with that key.
- * Trying to define a key with type 0 is illegal.
- *
- * The symbol table library does not make a copy the key field, so the
- * caller must ensure that any key it passes to isccc_symtab_define()
- * will not change until it calls isccc_symtab_undefine() or
- * isccc_symtab_destroy().
- *
- * A user-specified action will be called (if provided) when a symbol
- * is undefined. It can be used to free memory associated with keys
- * and/or values.
- */
-
- /***
- *** Imports.
- ***/
-
- #include <isc/lang.h>
- #include <isccc/types.h>
-
- /***
- *** Symbol Tables.
- ***/
-
- typedef union isccc_symvalue {
- void * as_pointer;
- int as_integer;
- unsigned int as_uinteger;
- } isccc_symvalue_t;
-
- typedef void (*isccc_symtabundefaction_t)(char *key, unsigned int type,
- isccc_symvalue_t value, void *userarg);
-
- typedef isc_boolean_t (*isccc_symtabforeachaction_t)(char *key,
- unsigned int type,
- isccc_symvalue_t value,
- void *userarg);
-
- typedef enum {
- isccc_symexists_reject = 0,
- isccc_symexists_replace = 1,
- isccc_symexists_add = 2
- } isccc_symexists_t;
-
- ISC_LANG_BEGINDECLS
-
- isc_result_t
- isccc_symtab_create(unsigned int size,
- isccc_symtabundefaction_t undefine_action, void *undefine_arg,
- isc_boolean_t case_sensitive, isccc_symtab_t **symtabp);
-
- void
- isccc_symtab_destroy(isccc_symtab_t **symtabp);
-
- isc_result_t
- isccc_symtab_lookup(isccc_symtab_t *symtab, const char *key, unsigned int type,
- isccc_symvalue_t *value);
-
- isc_result_t
- isccc_symtab_define(isccc_symtab_t *symtab, char *key, unsigned int type,
- isccc_symvalue_t value, isccc_symexists_t exists_policy);
-
- isc_result_t
- isccc_symtab_undefine(isccc_symtab_t *symtab, const char *key, unsigned int type);
-
- void
- isccc_symtab_foreach(isccc_symtab_t *symtab, isccc_symtabforeachaction_t action,
- void *arg);
-
- ISC_LANG_ENDDECLS
-
- #endif /* ISCCC_SYMTAB_H */
-