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Add function to safely modify postgresql.auto.conf

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This is required for PostgreSQL 12 and later.
This commit is contained in:
Ian Barwick
2019-08-14 16:57:42 +09:00
parent 4ebc43fd63
commit f5044465cb
7 changed files with 190 additions and 27 deletions
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76
strutil.c
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@@ -29,6 +29,9 @@ static int
xvsnprintf(char *str, size_t size, const char *format, va_list ap)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)));
static void
_key_value_list_set(KeyValueList *item_list, bool replace, const char *key, const char *value);
static int
xvsnprintf(char *str, size_t size, const char *format, va_list ap)
{
@@ -164,16 +167,74 @@ item_list_free(ItemList *item_list)
void
key_value_list_set(KeyValueList *item_list, const char *key, const char *value)
{
key_value_list_set_format(item_list, key, "%s", value);
_key_value_list_set(item_list, false, key, value);
return;
}
void
key_value_list_set_format(KeyValueList *item_list, const char *key, const char *value,...)
key_value_list_replace_or_set(KeyValueList *item_list, const char *key, const char *value)
{
_key_value_list_set(item_list, true, key, value);
return;
}
void
key_value_list_set_format(KeyValueList *item_list, const char *key, const char *value, ...)
{
va_list arglist;
char formatted_value[MAXLEN];
va_start(arglist, value);
(void) xvsnprintf(formatted_value, MAXLEN, value, arglist);
va_end(arglist);
return _key_value_list_set(item_list, false, key, formatted_value);
}
static void
_key_value_list_set(KeyValueList *item_list, bool replace, const char *key, const char *value)
{
KeyValueListCell *cell = NULL;
va_list arglist;
int keylen = 0;
int vallen = 0;
if (replace == true)
{
KeyValueListCell *prev_cell = NULL;
KeyValueListCell *next_cell = NULL;
for (cell = item_list->head; cell; cell = next_cell)
{
next_cell = cell->next;
if (strcmp(cell->key, key) == 0)
{
if (item_list->head == cell)
item_list->head = cell->next;
if (prev_cell)
{
prev_cell->next = cell->next;
if (item_list->tail == cell)
item_list->tail = prev_cell;
}
else if (item_list->tail == cell)
{
item_list->tail = NULL;
}
pfree(cell->key);
pfree(cell->value);
pfree(cell);
}
else
{
prev_cell = cell;
}
}
}
cell = (KeyValueListCell *) pg_malloc0(sizeof(KeyValueListCell));
@@ -184,17 +245,14 @@ key_value_list_set_format(KeyValueList *item_list, const char *key, const char *
}
keylen = strlen(key);
vallen = strlen(value);
cell->key = pg_malloc0(keylen + 1);
cell->value = pg_malloc0(MAXLEN);
cell->value = pg_malloc0(vallen + 1);
cell->output_mode = OM_NOT_SET;
strncpy(cell->key, key, keylen);
va_start(arglist, value);
(void) xvsnprintf(cell->value, MAXLEN, value, arglist);
va_end(arglist);
strncpy(cell->value, value, vallen);
if (item_list->tail)
item_list->tail->next = cell;