From bfd3f37be309c3647844aed937e6a66aad5fd3cb Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Fri, 29 Oct 2010 15:51:52 -0400
Subject: Fix comparisons of pointers with zero to compare with NULL instead.

Per C standard, these are semantically the same thing; but saying NULL
when you mean NULL is good for readability.

Marti Raudsepp, per results of INRIA's Coccinelle.
---
 src/backend/regex/regc_lex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/backend/regex')

diff --git a/src/backend/regex/regc_lex.c b/src/backend/regex/regc_lex.c
index da3ff0bf384..3360cfb0e9f 100644
--- a/src/backend/regex/regc_lex.c
+++ b/src/backend/regex/regc_lex.c
@@ -846,7 +846,7 @@ lexescape(struct vars * v)
 			if (ISERR())
 				FAILW(REG_EESCAPE);
 			/* ugly heuristic (first test is "exactly 1 digit?") */
-			if (v->now - save == 0 || ((int) c > 0 && (int) c <= v->nsubexp))
+			if (v->now == save || ((int) c > 0 && (int) c <= v->nsubexp))
 			{
 				NOTE(REG_UBACKREF);
 				RETV(BACKREF, (chr) c);
-- 
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