mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-01-06 15:24:56 +08:00
Code Issues Packages Projects Releases Wiki Activity

Faster test for overflow in str2txid, from Marko.

Browse Source
This commit is contained in:
Tom Lane 2007-10-08 22:07:16 +00:00
parent b196b7fb72
commit 9f3bd2994c
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
contrib/txid/txid.c
View File

@ -234,24 +234,27 @@ static txid
str2txid(const char *s, const char **endp) str2txid(const char *s, const char **endp)
{ {
txid val = 0; txid val = 0;
txid cutoff = MAX_TXID / 10;
txid cutlim = MAX_TXID % 10;
for (; *s; s++) for (; *s; s++)
{ {
txid last = val; unsigned d;
if (*s < '0' || *s > '9') if (*s < '0' || *s > '9')
break; break;
d = *s - '0';
val = val * 10 + (*s - '0');
/* /*
* check for overflow * check for overflow
*/ */
if (val > MAX_TXID || (val / 10) != last) if (val > cutoff || (val == cutoff && d > cutlim))
{ {
val = 0; val = 0;
break; break;
} }
val = val * 10 + d;
} }
if (endp) if (endp)
*endp = s; *endp = s;