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Code Issues Releases Wiki Activity

exists policy

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This commit is contained in:
Bob Halley
1998-12-19 00:13:59 +00:00
parent 22c7e1fbca
commit 95bcf47ff9
2 changed files with 34 additions and 12 deletions
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28
lib/isc/symtab.c
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@@ -168,7 +168,7 @@ isc_symtab_lookup(isc_symtab_t *symtab, const char *key, unsigned int type,
isc_result_t
isc_symtab_define(isc_symtab_t *symtab, char *key, unsigned int type,
isc_symvalue_t value)
isc_symvalue_t value, isc_symexists_t exists_policy)
{
unsigned int bucket;
elt_t *elt;
@@ -178,17 +178,29 @@ isc_symtab_define(isc_symtab_t *symtab, char *key, unsigned int type,
FIND(symtab, key, type, bucket, elt);
if (elt != NULL)
return (ISC_R_EXISTS);
elt = (elt_t *)isc_mem_get(symtab->mctx, sizeof *elt);
if (elt == NULL)
return (ISC_R_NOMEMORY);
if (exists_policy != isc_symexists_add && elt != NULL) {
if (exists_policy == isc_symexists_reject)
return (ISC_R_EXISTS);
INSIST(exists_policy == isc_symexists_replace);
UNLINK(symtab->table[bucket], elt, link);
if (symtab->undefine_action != NULL)
(symtab->undefine_action)(elt->key, elt->type,
elt->value);
} else {
elt = (elt_t *)isc_mem_get(symtab->mctx, sizeof *elt);
if (elt == NULL)
return (ISC_R_NOMEMORY);
}
elt->key = key;
elt->type = type;
elt->value = value;
APPEND(symtab->table[bucket], elt, link);
/*
* We prepend so that a 'type 0' lookup will return the most
* recent definition, and a 'type 0' undefine will undefine the
* most recent definition.
*/
PREPEND(symtab->table[bucket], elt, link);
return (ISC_R_SUCCESS);
}