msvcrt: If we're at EOF in the buffer and we have pattern %n in format string we…

dlls/msvcrt/scanf.h

@@ -415,7 +415,7 @@ _FUNCTION_ {
 	    case 'n': {
  		    if (!suppress) {
 			int*n = va_arg(ap, int*);
-			*n = consumed - (nch!=_EOF_);
+			*n = consumed - 1;
 		    }
 		    /* This is an odd one: according to the standard,
 		     * "Execution of a %n directive does not increment the

dlls/msvcrt/tests/scanf.c

@@ -162,6 +162,12 @@ static void test_sscanf( void )
     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);
+
+    /* Check where %n matches to EOF in buffer */
+    strcpy(buffer, "3:45");
+    ret = sscanf(buffer, "%d:%d%n", &hour, &min, &number_so_far);
+    ok(ret == 2, "Wrong number of arguments read: %d\n", ret);
+    ok(number_so_far == 4, "%%n yielded wrong result: %d\n", number_so_far);
 }
 
 START_TEST(scanf)