Re: [Qemu-devel] [PATCH 13/17] qemu-print: New qemu_fprintf(), qemu_vfprintf()

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Markus Armbruster (armbru@redhat.com) wrote:
> Code that doesn't want to know about current monitor vs. stdout
> vs. stderr takes an fprintf_function callback and a FILE * argument to
> pass to it.  Actual arguments are either fprintf() and stdout or
> stderr, or monitor_fprintf() and the current monitor cast to FILE *.
> monitor_fprintf() casts it right back, and is otherwise identical to
> monitor_printf().  The type-punning is ugly.
> 
> New qemu_fprintf() and qemu_vprintf() address this need without type
> punning: they are like fprintf() and vfprintf(), except they print to
> the current monitor when passed a null FILE *.  The next commits will
> put them to use.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  include/qemu/qemu-print.h |  4 ++++
>  util/qemu-print.c         | 27 +++++++++++++++++++++++++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/include/qemu/qemu-print.h b/include/qemu/qemu-print.h
> index 8fed32bf42..40b596262f 100644
> --- a/include/qemu/qemu-print.h
> +++ b/include/qemu/qemu-print.h
> @@ -16,4 +16,8 @@
>  int qemu_vprintf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
>  int qemu_printf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
>  
> +int qemu_vfprintf(FILE *stream, const char *fmt, va_list ap)
> +    GCC_FMT_ATTR(2, 0);
> +int qemu_fprintf(FILE *stream, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
> +
>  #endif
> diff --git a/util/qemu-print.c b/util/qemu-print.c
> index 86f9417af8..e79d6b8396 100644
> --- a/util/qemu-print.c
> +++ b/util/qemu-print.c
> @@ -40,3 +40,30 @@ int qemu_printf(const char *fmt, ...)
>      va_end(ap);
>      return ret;
>  }
> +
> +/*
> + * Print like vfprintf()
> + * Print to @stream if non-null, else to current monitor.
> + */
> +int qemu_vfprintf(FILE *stream, const char *fmt, va_list ap)
> +{
> +    if (!stream) {
> +        return monitor_vprintf(cur_mon, fmt, ap);
> +    }
> +    return vfprintf(stream, fmt, ap);
> +}
> +
> +/*
> + * Print like fprintf().
> + * Print to @stream if non-null, else to current monitor.
> + */
> +int qemu_fprintf(FILE *stream, const char *fmt, ...)
> +{
> +    va_list ap;
> +    int ret;
> +
> +    va_start(ap, fmt);
> +    ret = qemu_vfprintf(stream, fmt, ap);
> +    va_end(ap);
> +    return ret;
> +}
> -- 
> 2.17.2
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK