103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
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/*++
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/* NAME
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/* dict_ht 3
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/* SUMMARY
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/* dictionary manager interface to hash tables
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/* SYNOPSIS
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/* #include <dict_ht.h>
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/*
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/* DICT *dict_ht_open(table, remove)
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/* HTABLE *table;
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/* void (*remove)(char *value)
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/* DESCRIPTION
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/* dict_ht_open() makes specified hash table accessible via the
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/* generic dictionary operations documented in dict_open(3).
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/* \fIremove\fR specifies an optional callback function
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/* that is called by the hash table manager when the hash table is
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/* removed from the dictionary manager's care. The hash table is not
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/* destroyed when \fIremove\fR is a null pointer.
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/* SEE ALSO
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/* dict(3) generic dictionary manager
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include "sys_defs.h"
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/* Utility library. */
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#include "mymalloc.h"
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#include "htable.h"
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#include "dict.h"
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#include "dict_ht.h"
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/* Application-specific. */
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typedef struct {
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DICT dict; /* generic members */
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HTABLE *table; /* hash table */
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void (*remove) (char *); /* callback */
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} DICT_HT;
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/* dict_ht_lookup - find hash-table entry */
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static const char *dict_ht_lookup(DICT *dict, const char *name)
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{
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DICT_HT *dict_ht = (DICT_HT *) dict;
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dict_errno = 0;
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return (htable_find(dict_ht->table, name));
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}
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/* dict_ht_update - add or update hash-table entry */
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static void dict_ht_update(DICT *dict, const char *name, const char *value)
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{
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DICT_HT *dict_ht = (DICT_HT *) dict;
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HTABLE_INFO *ht;
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if ((ht = htable_locate(dict_ht->table, name)) != 0) {
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myfree(ht->value);
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} else {
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ht = htable_enter(dict_ht->table, name, (char *) 0);
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}
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ht->value = mystrdup(value);
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}
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/* dict_ht_close - disassociate from hash table */
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static void dict_ht_close(DICT *dict)
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{
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DICT_HT *dict_ht = (DICT_HT *) dict;
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if (dict_ht->remove)
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htable_free(dict_ht->table, dict_ht->remove);
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myfree((char *) dict);
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}
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/* dict_ht_open - create association with hash table */
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DICT *dict_ht_open(HTABLE *table, void (*remove) (char *))
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{
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DICT_HT *dict_ht;
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dict_ht = (DICT_HT *) mymalloc(sizeof(*dict_ht));
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dict_ht->dict.lookup = dict_ht_lookup;
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dict_ht->dict.update = dict_ht_update;
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dict_ht->dict.close = dict_ht_close;
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dict_ht->dict.fd = -1;
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dict_ht->table = table;
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dict_ht->remove = remove;
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return (&dict_ht->dict);
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}
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