From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 27 May 2014 02:23:39 +0000 (-0400)
Subject: Avoid unportable usage of sscanf(UINT64_FORMAT).
X-Git-Tag: REL9_1_14~36
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3ae8e8bf552f622600b1a356550882e886753119;p=postgresql

Avoid unportable usage of sscanf(UINT64_FORMAT).

On Mingw, it seems that scanf() doesn't necessarily accept the same format
codes that printf() does, and in particular it may fail to recognize %llu
even though printf() does.  Since configure only probes printf() behavior
while setting up the INT64_FORMAT macros, this means it's unsafe to use
those macros with scanf().  We had only one instance of such a coding
pattern, in contrib/pg_stat_statements, so change that code to avoid
the problem.

Per buildfarm warnings.  Back-patch to 9.0 where the troublesome code
was introduced.

Michael Paquier
---

diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 468282ec99..5793068446 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -635,7 +635,7 @@ pgss_ProcessUtility(Node *parsetree, const char *queryString,
 	{
 		instr_time	start;
 		instr_time	duration;
-		uint64		rows = 0;
+		uint64		rows;
 		BufferUsage bufusage;
 
 		bufusage = pgBufferUsage;
@@ -664,7 +664,15 @@ pgss_ProcessUtility(Node *parsetree, const char *queryString,
 
 		/* parse command tag to retrieve the number of affected rows. */
 		if (completionTag &&
-			sscanf(completionTag, "COPY " UINT64_FORMAT, &rows) != 1)
+			strncmp(completionTag, "COPY ", 5) == 0)
+		{
+#ifdef HAVE_STRTOULL
+			rows = strtoull(completionTag + 5, NULL, 10);
+#else
+			rows = strtoul(completionTag + 5, NULL, 10);
+#endif
+		}
+		else
 			rows = 0;
 
 		/* calc differences of buffer counters. */