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Avoid character classification in regex escape parsing.

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For regex escape sequences, just test directly for the relevant ASCII
characters rather than using locale-sensitive character
classification.

This fixes an assertion failure when a locale considers a non-ASCII
character, such as "൧", to be a digit.

Reported-by: Richard Guo
Discussion: https://postgr.es/m/CAMbWs49Q6UoKGeT8pBkMtJGJd+16CBFZaaWUk9Du+2ERE5g_YA@mail.gmail.com
Backpatch-through: 11
This commit is contained in:
Jeff Davis 2023-04-21 08:19:41 -07:00
parent a14afd3bdc
commit 109363de0a
1 changed files with 10 additions and 3 deletions
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13
src/backend/regex/regc_lex.c
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@ -613,7 +613,11 @@ lexescape(struct vars *v)
assert(!ATEOS());
c = *v->now++;
if (!iscalnum(c))
/* if it's not alphanumeric ASCII, treat it as a plain character */
if (!('a' <= c && c <= 'z') &&
!('A' <= c && c <= 'Z') &&
!('0' <= c && c <= '9'))
RETV(PLAIN, c);
NOTE(REG_UNONPOSIX);
@ -755,8 +759,11 @@ lexescape(struct vars *v)
RETV(PLAIN, c);
break;
default:
assert(iscalpha(c));
FAILW(REG_EESCAPE); /* unknown alphabetic escape */
/*
* Throw an error for unrecognized ASCII alpha escape sequences,
* which reserves them for future use if needed.
*/
FAILW(REG_EESCAPE);
break;
}
assert(NOTREACHED);