Allow scanf to continue parsing format string after a '%n'.

dlls/msvcrt/scanf.h

@@ -427,6 +427,19 @@ _FUNCTION_ {
 			int*n = va_arg(ap, int*);
 			*n = consumed - (nch!=_EOF_);
 		    }
+		    /* This is an odd one: according to the standard,
+		     * "Execution of a %n directive does not increment the
+		     * assignment count returned at the completion of
+		     * execution" even if it wasn't suppressed with the
+		     * '*' flag.  The Corrigendum to the standard seems
+		     * to contradict this (comment out the assignment to
+		     * suppress below if you want to implement these
+		     * alternate semantics) but the windows program I'm
+		     * looking at expects the behavior I've coded here
+		     * (which happens to be what glibc does as well).
+		     */
+		    suppress = 1;
+		    st = 1;
 	        }
 		break;
 	    case '[': {

dlls/msvcrt/tests/scanf.c

@@ -117,6 +117,14 @@ static void test_sscanf( void )
     ok(hour == 18, "Field 1 incorrect: %d\n", hour);
     ok(min == 59, "Field 2 incorrect: %d\n", min);
     ok(c == 0x55, "Field 3 incorrect: 0x%02x\n", c);
+
+    /* Check %n (also whitespace in format strings and %s) */
+    buffer[0]=0; buffer1[0]=0;
+    ret = sscanf("abc   def", "%s %n%s", buffer, &number_so_far, buffer1);
+    ok(strcmp(buffer, "abc")==0, "First %%s read incorrectly: %s\n", buffer);
+    ok(strcmp(buffer1,"def")==0, "Second %%s read incorrectly: %s\n", buffer1);
+    ok(number_so_far==6, "%%n yielded wrong result: %d\n", number_so_far);
+    ok(ret == 2, "%%n shouldn't count as a conversion: %d\n", ret);
 }
 
 START_TEST(scanf)