/*
* __wt_config_getone --
* Get the value for a given key from a single config string.
*/
int
__wt_config_getone(WT_SESSION_IMPL *session,
const char *cfg, WT_CONFIG_ITEM *key, WT_CONFIG_ITEM *value)
{
const char *cfgs[] = { cfg, NULL };
return (__wt_config_get(session, cfgs, key, value));
}
/*
* __wt_config_gets --
* Given a NULL-terminated list of configuration strings, find the final
* value for a given string key.
*/
int
__wt_config_gets(WT_SESSION_IMPL *session,
const char **cfg, const char *key, WT_CONFIG_ITEM *value)
{
WT_CONFIG_ITEM key_item = { key, strlen(key), 0, ITEM_STRING };
return (__wt_config_get(session, cfg, &key_item, value));
}
/*
* __wt_config_gets --
* Given a NULL-terminated list of configuration strings, find the final
* value for a given string key.
*/
int
__wt_config_gets(WT_SESSION_IMPL *session,
const char **cfg, const char *key, WT_CONFIG_ITEM *value)
{
WT_CONFIG_ITEM key_item;
key_item.type = ITEM_STRING;
key_item.str = key;
key_item.len = strlen(key);
return (__wt_config_get(session, cfg, &key_item, value));
}
/*
* __wt_config_collapse --
* Collapse a set of configuration strings into newly allocated memory.
*
* This function takes a NULL-terminated list of configuration strings (where
* the first one contains all the defaults and the values are in order from
* least to most preferred, that is, the default values are least preferred),
* and collapses them into newly allocated memory. The algorithm is to walk
* the first of the configuration strings, and for each entry, search all of
* the configuration strings for a final value, keeping the last value found.
*
* Notes:
* Any key not appearing in the first configuration string is discarded
* from the final result, because we'll never search for it.
*
* Nested structures aren't parsed. For example, imagine a configuration
* string contains "key=(k2=v2,k3=v3)", and a subsequent string has
* "key=(k4=v4)", the result will be "key=(k4=v4)", as we search for and
* use the final value of "key", regardless of field overlap or missing
* fields in the nested value.
*/
int
__wt_config_collapse(
WT_SESSION_IMPL *session, const char **cfg, char **config_ret)
{
WT_CONFIG cparser;
WT_CONFIG_ITEM k, v;
WT_DECL_ITEM(tmp);
WT_DECL_RET;
*config_ret = NULL;
WT_RET(__wt_scr_alloc(session, 0, &tmp));
__wt_config_init(session, &cparser, cfg[0]);
while ((ret = __wt_config_next(&cparser, &k, &v)) == 0) {
if (k.type != WT_CONFIG_ITEM_STRING &&
k.type != WT_CONFIG_ITEM_ID)
WT_ERR_MSG(session, EINVAL,
"Invalid configuration key found: '%s'", k.str);
WT_ERR(__wt_config_get(session, cfg, &k, &v));
/* Include the quotes around string keys/values. */
if (k.type == WT_CONFIG_ITEM_STRING) {
--k.str;
k.len += 2;
}
if (v.type == WT_CONFIG_ITEM_STRING) {
--v.str;
v.len += 2;
}
WT_ERR(__wt_buf_catfmt(session, tmp, "%.*s=%.*s,",
(int)k.len, k.str, (int)v.len, v.str));
}
/* We loop until error, and the expected error is WT_NOTFOUND. */
if (ret != WT_NOTFOUND)
goto err;
/*
* If the caller passes us no valid configuration strings, we get here
* with no bytes to copy -- that's OK, the underlying string copy can
* handle empty strings.
*
* Strip any trailing comma.
*/
if (tmp->size != 0)
--tmp->size;
ret = __wt_strndup(session, tmp->data, tmp->size, config_ret);
err: __wt_scr_free(session, &tmp);
return (ret);
}
