postgres.git / summary / log / commit / refs
commit 9bfb1f2d64c4cab108a69e4bf66da4c2464dcaaf
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon Jun 26 14:31:10 2017 +0000
Minor code review for parse_phrase_operator().
Fix its header comment, which described the old behavior of the <N>
phrase distance operator; we missed updating that in commit 028350f61.
Also, reset errno before strtol() call, to defend against the possibility
that it was already ERANGE at entry. (The lack of complaints says that
it generally isn't, but this is at least a latent bug.) Very minor
stylistic improvements as well.
Victor Drobny noted the obsolete comment, I noted the errno issue.
Back-patch to 9.6 where this code was added, just in case the errno
issue is a live bug in some cases.
Discussion: https://postgr.es/m/2b5382fdff9b1f79d5eb2c99c4d2cbe2@postgrespro.ru
src/backend/utils/adt/tsquery.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/src/backend/utils/adt/tsquery.c b/src/backend/utils/adt/tsquery.c
index f0bd52877f3..df75ee4f1ec 100644
--- a/src/backend/utils/adt/tsquery.c
+++ b/src/backend/utils/adt/tsquery.c
@@ -113,7 +113,7 @@ get_modifiers(char *buf, int16 *weight, bool *prefix)
* Parse phrase operator. The operator
* may take the following forms:
*
- * a <X> b (distance is no greater than X)
+ * a <N> b (distance is exactly N lexemes)
* a <-> b (default distance = 1)
*
* The buffer should begin with '<' char
@@ -129,10 +129,9 @@ parse_phrase_operator(char *buf, int16 *distance)
PHRASE_ERR,
PHRASE_FINISH
} state = PHRASE_OPEN;
-
char *ptr = buf;
char *endptr;
- long l = 1;
+ long l = 1; /* default distance */
while (*ptr)
{
@@ -151,16 +150,17 @@ parse_phrase_operator(char *buf, int16 *distance)
ptr++;
break;
}
- else if (!t_isdigit(ptr))
+ if (!t_isdigit(ptr))
{
state = PHRASE_ERR;
break;
}
+ errno = 0;
l = strtol(ptr, &endptr, 10);
if (ptr == endptr)
state = PHRASE_ERR;
- else if (errno == ERANGE || l > MAXENTRYPOS)
+ else if (errno == ERANGE || l < 0 || l > MAXENTRYPOS)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("distance in phrase operator should not be greater than %d",
[parent: 4947fced73c2]