Re: [Qemu-devel] [PATCH 2/3] test-qga: Avoid qobject_from_jsonf("%"PRId64)

[Paolo Bonzini <pbonzini@redhat.com>]

----- Original Message -----
> From: "Eric Blake" <eblake@redhat.com>
> To: qemu-devel@nongnu.org
> Cc: programmingkidx@gmail.com, armbru@redhat.com, pbonzini@redhat.com
> Sent: Wednesday, November 23, 2016 5:16:27 AM
> Subject: [PATCH 2/3] test-qga: Avoid qobject_from_jsonf("%"PRId64)
> 
> The qobject_from_jsonf() function implements a pseudo-printf
> language for creating a QObject; however, it is hard-coded to
> only parse a subset of formats understood by printf().  In
> particular, any use of a 64-bit integer works only if the
> system's definition of PRId64 matches what the parser expects;
> which works on glibc (%lld) and mingw (%I64d), but not on
> Mac OS (%qd).  Rather than enhance the parser, it is just as
> easy to use normal printf() for this particular conversion,
> matching what is done elsewhere in this file.
> 
> Reported by: G 3 <programmingkidx@gmail.com>
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>  tests/test-qga.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/test-qga.c b/tests/test-qga.c
> index 40af649..421e27c 100644
> --- a/tests/test-qga.c
> +++ b/tests/test-qga.c
> @@ -852,8 +852,13 @@ static void test_qga_guest_exec(gconstpointer fix)
>      /* wait for completion */
>      now = g_get_monotonic_time();
>      do {
> -        ret = qmp_fd(fixture->fd, "{'execute': 'guest-exec-status',"
> -                     " 'arguments': { 'pid': %" PRId64 "  } }", pid);
> +        char *cmd;
> +
> +        cmd = g_strdup_printf("{'execute': 'guest-exec-status',"
> +                              " 'arguments': { 'pid': %" PRId64 " } }",
> +                              pid);

This is too ugly to see. :)  Why not use %lld, or just make pid an
int?  Are there really systems with 64-bit pid_t?

Paolo

> +        ret = qmp_fd(fixture->fd, cmd);
> +        g_free(cmd);
>          g_assert_nonnull(ret);
>          val = qdict_get_qdict(ret, "return");
>          exited = qdict_get_bool(val, "exited");
> --
> 2.7.4
> 
>