/*
* parse snapshot from cstring
*/
static TxidSnapshot *
parse_snapshot(const char *str)
{
txid xmin;
txid xmax;
txid last_val = 0,
val;
const char *str_start = str;
const char *endp;
StringInfo buf;
xmin = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
xmax = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
/* it should look sane */
if (xmin == 0 || xmax == 0 || xmin > xmax)
goto bad_format;
/* allocate buffer */
buf = buf_init(xmin, xmax);
/* loop over values */
while (*str != '\0')
{
/* read next value */
val = str2txid(str, &endp);
str = endp;
/* require the input to be in order */
if (val < xmin || val >= xmax || val < last_val)
goto bad_format;
/* skip duplicates */
if (val != last_val)
buf_add_txid(buf, val);
last_val = val;
if (*str == ',')
str++;
else if (*str != '\0')
goto bad_format;
}
return buf_finalize(buf);
bad_format:
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type txid_snapshot: \"%s\"",
str_start)));
return NULL; /* keep compiler quiet */
}
/*
* parse snapshot from cstring
*/
static TxidSnapshot *
parse_snapshot(const char *str)
{
txid xmin;
txid xmax;
txid last_val = 0,
val;
const char *str_start = str;
const char *endp;
StringInfo buf;
xmin = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
xmax = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
/* it should look sane */
if (xmin == 0 || xmax == 0 || xmin > xmax)
goto bad_format;
/* allocate buffer */
buf = buf_init(xmin, xmax);
/* loop over values */
while (*str != '\0')
{
/* read next value */
val = str2txid(str, &endp);
str = endp;
/* require the input to be in order */
if (val < xmin || val >= xmax || val < last_val)
goto bad_format;
/* skip duplicates */
if (val != last_val)
buf_add_txid(buf, val);
last_val = val;
if (*str == ',')
str++;
else if (*str != '\0')
goto bad_format;
}
return buf_finalize(buf);
bad_format:
elog(ERROR, "invalid input for txid_snapshot: \"%s\"", str_start);
return NULL;
}
