re PR c/89495 (gcc/c-family/c-format.c:1272:20: runtime error: signed integer…

re PR c/89495 (gcc/c-family/c-format.c:1272:20: runtime error: signed integer overflow: 214748365 * 10 cannot be represented in type 'int')

	PR c/89495
	* c-format.c (maybe_read_dollar_number): Compute nargnum in
	HOST_WIDE_INT type to avoid overflows and change overflow_flag
	checking.

From-SVN: r269198

gcc/c-family/ChangeLog

+2019-02-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/89495
+	* c-format.c (maybe_read_dollar_number): Compute nargnum in
+	HOST_WIDE_INT type to avoid overflows and change overflow_flag
+	checking.
+
 2019-02-22  Richard Biener  <rguenther@suse.de>
 
 	* c-pch.c (no_checksum): Remove.

gcc/c-family/c-format.c

@@ -1268,9 +1268,9 @@ maybe_read_dollar_number (const char **format,
   overflow_flag = 0;
   while (ISDIGIT (*fcp))
     {
-      int nargnum;
-      nargnum = 10 * argnum + (*fcp - '0');
-      if (nargnum < 0 || nargnum / 10 != argnum)
+      HOST_WIDE_INT nargnum
+	= HOST_WIDE_INT_UC (10) * argnum + (*fcp - '0');
+      if ((int) nargnum != nargnum)
 	overflow_flag = 1;
       argnum = nargnum;
       fcp++;