NetBSD/gnu/dist/postfix/util/dict_ht.c

103 lines
2.4 KiB
C

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