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aes.h	1.05 KB	-rw-r--r--
app.h	10.23 KB	-rw-r--r--
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atomic.h	4.15 KB	-rw-r--r--
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commandline.h	1.69 KB	-rw-r--r--
condition.h	1.44 KB	-rw-r--r--
counter.h	1.88 KB	-rw-r--r--
crc64.h	986 B	-rw-r--r--
deprecated.h	622 B	-rw-r--r--
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entropy.h	8.76 KB	-rw-r--r--
errno.h	658 B	-rw-r--r--
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file.h	11.43 KB	-rw-r--r--
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hash.h	7.52 KB	-rw-r--r--
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hmacmd5.h	1.75 KB	-rw-r--r--
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httpd.h	2.26 KB	-rw-r--r--
int.h	1.37 KB	-rw-r--r--
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json.h	1.42 KB	-rw-r--r--
keyboard.h	976 B	-rw-r--r--
lang.h	636 B	-rw-r--r--
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mutex.h	3.44 KB	-rw-r--r--
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net.h	10.32 KB	-rw-r--r--
netaddr.h	4.56 KB	-rw-r--r--
netdb.h	862 B	-rw-r--r--
netscope.h	947 B	-rw-r--r--
offset.h	699 B	-rw-r--r--
once.h	981 B	-rw-r--r--
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os.h	670 B	-rw-r--r--
parseint.h	1.49 KB	-rw-r--r--
platform.h	9.31 KB	-rw-r--r--
pool.h	3.42 KB	-rw-r--r--
portset.h	3.21 KB	-rw-r--r--
print.h	2.49 KB	-rw-r--r--
queue.h	4.66 KB	-rw-r--r--
quota.h	2.29 KB	-rw-r--r--
radix.h	6.37 KB	-rw-r--r--
random.h	2.99 KB	-rw-r--r--
ratelimiter.h	3.38 KB	-rw-r--r--
refcount.h	7.89 KB	-rw-r--r--
regex.h	766 B	-rw-r--r--
region.h	1.99 KB	-rw-r--r--
resource.h	2.8 KB	-rw-r--r--
result.h	4.62 KB	-rw-r--r--
resultclass.h	1.56 KB	-rw-r--r--
rwlock.h	3.6 KB	-rw-r--r--
safe.h	1.21 KB	-rw-r--r--
serial.h	1.4 KB	-rw-r--r--
sha1.h	1.52 KB	-rw-r--r--
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sockaddr.h	6 KB	-rw-r--r--
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stats.h	3.02 KB	-rw-r--r--
stdio.h	1.74 KB	-rw-r--r--
stdlib.h	703 B	-rw-r--r--
stdtime.h	1.3 KB	-rw-r--r--
strerror.h	776 B	-rw-r--r--
string.h	5.94 KB	-rw-r--r--
symtab.h	4.21 KB	-rw-r--r--
syslog.h	843 B	-rw-r--r--
task.h	21.08 KB	-rw-r--r--
taskpool.h	3.61 KB	-rw-r--r--
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time.h	8.66 KB	-rw-r--r--
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types.h	5.54 KB	-rw-r--r--
util.h	7.49 KB	-rw-r--r--
version.h	688 B	-rw-r--r--
xml.h	1.07 KB	-rw-r--r--

Code Editor : symtab.h

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef ISC_SYMTAB_H
#define ISC_SYMTAB_H 1

/*****
 ***** Module Info
 *****/

/*! \file isc/symtab.h
 * \brief Provides a simple memory-based symbol table.
 *
 * Keys are C strings, and key comparisons are case-insensitive.  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	#isc_symexists_reject	Disallow the define, returning #ISC_R_EXISTS
 *\li	#isc_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	#isc_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 isc_symtab_define() will not
 * change until it calls isc_symtab_undefine() or isc_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.
 *
 * A symbol table is implemented as a hash table of lists; the size of the
 * hash table is set by the 'size' parameter to isc_symtbl_create().  When
 * the number of entries in the symbol table reaches three quarters of this
 * value, the hash table is reallocated with size doubled, in order to
 * optimize lookup performance.  This has a negative effect on insertion
 * performance, which can be mitigated by sizing the table appropriately
 * when creating it.
 *
 * \li MP:
 *	The callers of this module must ensure any required synchronization.
 *
 * \li Reliability:
 *	No anticipated impact.
 *
 * \li Resources:
 *	TBS
 *
 * \li Security:
 *	No anticipated impact.
 *
 * \li Standards:
 *	None.
 */

/***
 *** Imports.
 ***/

#include <isc/lang.h>
#include <isc/types.h>

/*
 *** Symbol Tables.
 ***/
/*% Symbol table value. */
typedef union isc_symvalue {
	void *				as_pointer;
	const void *			as_cpointer;
	int				as_integer;
	unsigned int			as_uinteger;
} isc_symvalue_t;

typedef void (*isc_symtabaction_t)(char *key, unsigned int type,
				   isc_symvalue_t value, void *userarg);
/*% Symbol table exists. */
typedef enum {
	isc_symexists_reject = 0,	/*%< Disallow the define */
	isc_symexists_replace = 1,	/*%< Replace the old value with the new */
	isc_symexists_add = 2		/*%< Add the new tuple */
} isc_symexists_t;

ISC_LANG_BEGINDECLS

/*% Create a symbol table. */
isc_result_t
isc_symtab_create(isc_mem_t *mctx, unsigned int size,
		  isc_symtabaction_t undefine_action, void *undefine_arg,
		  isc_boolean_t case_sensitive, isc_symtab_t **symtabp);

/*% Destroy a symbol table. */
void
isc_symtab_destroy(isc_symtab_t **symtabp);

/*% Lookup a symbol table. */
isc_result_t
isc_symtab_lookup(isc_symtab_t *symtab, const char *key, unsigned int type,
		  isc_symvalue_t *value);

/*% Define a symbol table. */
isc_result_t
isc_symtab_define(isc_symtab_t *symtab, const char *key, unsigned int type,
		  isc_symvalue_t value, isc_symexists_t exists_policy);

/*% Undefine a symbol table. */
isc_result_t
isc_symtab_undefine(isc_symtab_t *symtab, const char *key, unsigned int type);

/*% Return the number of items in a symbol table. */
unsigned int
isc_symtab_count(isc_symtab_t *symtab);
ISC_LANG_ENDDECLS

#endif /* ISC_SYMTAB_H */

${this.title}

Code Editor : symtab.h