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Get rid of dependency on strtoull() --- Marko Kreen.

Browse Source 
Some additional minor editorializing by Tom.
This commit is contained in:
Tom Lane 2007-10-08 20:25:40 +00:00
parent 7121cc9021
commit b196b7fb72
3 changed files with 59 additions and 13 deletions
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21
contrib/txid/expected/txid.out
View File

@ -8,18 +8,18 @@ select '12:13:'::txid_snapshot;
(1 row)
select '12:13:1,2'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "12:13:1,2"
-- errors
select '31:12:'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "31:12:"
select '0:1:'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "0:1:"
select '12:13:0'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "12:13:0"
select '12:16:14,13'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "12:16:14,13"
select '12:16:14,14'::txid_snapshot;
ERROR: illegal txid_snapshot input format
ERROR: invalid input for txid_snapshot: "12:16:14,14"
create table snapshot_test (
nr integer,
snap txid_snapshot
@ -210,3 +210,12 @@ select txid_visible_in_snapshot('1000100010001015', '1000100010001000:1000100010
t
(1 row)
-- test 64bit overflow
SELECT txid_snapshot '1:9223372036854775807:3';
txid_snapshot
-------------------------
1:9223372036854775807:3
(1 row)
SELECT txid_snapshot '1:9223372036854775808:3';
ERROR: invalid input for txid_snapshot: "1:9223372036854775808:3"

3
contrib/txid/sql/txid.sql
View File

@ -56,3 +56,6 @@ select txid_snapshot '1000100010001000:1000100010001100:1000100010001012,1000100
select txid_visible_in_snapshot('1000100010001012', '1000100010001000:1000100010001100:1000100010001012,1000100010001013');
select txid_visible_in_snapshot('1000100010001015', '1000100010001000:1000100010001100:1000100010001012,1000100010001013');
-- test 64bit overflow
SELECT txid_snapshot '1:9223372036854775807:3';
SELECT txid_snapshot '1:9223372036854775808:3';

48
contrib/txid/txid.c
View File

@ -225,6 +225,39 @@ buf_finalize(StringInfo buf)
return snap;
}
/*
* simple number parser.
*
* We return 0 on error, which is invalid value for txid.
*/
static txid
str2txid(const char *s, const char **endp)
{
txid val = 0;
for (; *s; s++)
{
txid last = val;
if (*s < '0' || *s > '9')
break;
val = val * 10 + (*s - '0');
/*
* check for overflow
*/
if (val > MAX_TXID || (val / 10) != last)
{
val = 0;
break;
}
}
if (endp)
*endp = s;
return val;
}
/*
* parse snapshot from cstring
*/
@ -234,21 +267,22 @@ parse_snapshot(const char *str)
txid xmin;
txid xmax;
txid last_val = 0, val;
char *endp;
const char *str_start = str;
const char *endp;
StringInfo buf;
xmin = (txid) strtoull(str, &endp, 0);
xmin = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
xmax = (txid) strtoull(str, &endp, 0);
xmax = str2txid(str, &endp);
if (*endp != ':')
goto bad_format;
str = endp + 1;
/* it should look sane */
if (xmin > xmax || xmin == 0 || xmax > MAX_TXID)
if (xmin == 0 || xmax == 0 || xmin > xmax)
goto bad_format;
/* allocate buffer */
@ -258,11 +292,11 @@ parse_snapshot(const char *str)
while (*str != '\0')
{
/* read next value */
val = (txid) strtoull(str, &endp, 0);
val = str2txid(str, &endp);
str = endp;
/* require the input to be in order */
if (val < xmin || val <= last_val || val >= xmax)
if (val < xmin || val >= xmax || val <= last_val)
goto bad_format;
buf_add_txid(buf, val);
@ -277,7 +311,7 @@ parse_snapshot(const char *str)
return buf_finalize(buf);
bad_format:
elog(ERROR, "illegal txid_snapshot input format");
elog(ERROR, "invalid input for txid_snapshot: \"%s\"", str_start);
return NULL;
}