Re: [Qemu-devel] [PATCH for-1.7 1/2] acpi-build: fix build on glib < 2.22

[Paolo Bonzini <pbonzini@redhat.com>]

Il 21/11/2013 13:17, Michael S. Tsirkin ha scritto:
> g_string_vprintf was only introduced in 2.24 so switch to vsnprintf
> instead.  A bit uglier but name size is fixed at 4 bytes here so it's
> easy.
> 
> Reported-by: Richard Henderson <rth@redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  hw/i386/acpi-build.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 486e705..59a17df 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -287,16 +287,17 @@ static inline void build_append_array(GArray *array, GArray *val)
>  
>  static void build_append_nameseg(GArray *array, const char *format, ...)
>  {
> -    GString *s = g_string_new("");
> +    /* It would be nicer to use g_string_vprintf but it's only there in 2.22 */
> +    char s[] = "XXXX";
> +    int len;
>      va_list args;
>  
>      va_start(args, format);
> -    g_string_vprintf(s, format, args);
> +    len = vsnprintf(s, sizeof s, format, args);
>      va_end(args);
>  
> -    assert(s->len == 4);
> -    g_array_append_vals(array, s->str, s->len);
> -    g_string_free(s, true);
> +    assert(len == 4);
> +    g_array_append_vals(array, s, len);
>  }
>  
>  /* 5.4 Definition Block Encoding */
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>