Re: [Qemu-devel] [PATCHv2] unicore32-softmmu: Add a minimal curses screen support

["Andreas Färber" <afaerber@suse.de>]

Am 01.08.2012 05:09, schrieb gxt@mprc.pku.edu.cn:
> From: Guan Xuetao <gxt@mprc.pku.edu.cn>
> 
> This patch adds a minimal curses screen support for unicore32-softmmu.
> We assume 80*30 screen size to minimize the implementation.
> Two problems are not solved, but they are innocuous.
> 1. curses windows will be blank when switching to monitor screen and back
> 2. backspace is not handled yet
> 
> v1->v2: add extra handler for '\r'
> 
> Signed-off-by: Zhang Mengchi <zhangmengchi@mprc.pku.edu.cn>
> Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
> ---
>  target-unicore32/helper.c |   45 +++++++++++++++++++++++++++++++++++++++++++--
>  1 files changed, 43 insertions(+), 2 deletions(-)
> 
> diff --git a/target-unicore32/helper.c b/target-unicore32/helper.c
> index d6eb758..d21e7df 100644
> --- a/target-unicore32/helper.c
> +++ b/target-unicore32/helper.c
> @@ -13,6 +13,7 @@
>  #include "gdbstub.h"
>  #include "helper.h"
>  #include "host-utils.h"
> +#include "console.h"
>  
>  #undef DEBUG_UC32
>  
> @@ -186,10 +187,50 @@ uint32_t helper_cp0_get(CPUUniCore32State *env, uint32_t creg, uint32_t cop)
>      return 0;
>  }
>  
> +#ifdef CONFIG_CURSES
> +/*
> + * FIXME:
> + *     1. curses windows will be blank when switching back
> + *     2. backspace is not handled yet
> + */
> +static void putc_on_screen(unsigned char ch)
> +{
> +    static WINDOW *localwin;
> +    static int init;
> +
> +    if (!init) {
> +        /* Assume 80 * 30 screen to minimize the implementation */
> +        localwin = newwin(30, 80, 0, 0);
> +        scrollok(localwin, TRUE);
> +        init = TRUE;
> +    }
> +
> +    if (isprint(ch)) {
> +        wprintw(localwin, "%c", ch);
> +    } else {
> +        switch (ch) {
> +        case '\n':
> +            wprintw(localwin, "%c", ch);
> +            break;
> +        case '\r':
> +            /* If '\r' is put before '\n', the curses window will destroy the
> +             * last print line. And meanwhile, '\n' implifies '\r' inside. */
> +            break;
> +        default: /* Not handled, so just print it hex code */
> +            wprintw(localwin, "-- 0x%h --", ch);
> +        }
> +    }
> +
> +    wrefresh(localwin);
> +}
> +#else
> +#define putc_on_screen(c)               do { } while (0)
> +#endif
> +
>  void helper_cp1_putc(target_ulong x)
>  {
> -    /* TODO: curses display should be added here for screen output. */
> -    DPRINTF("%c", x);
> +    putc_on_screen((unsigned char)x);   /* Output to screen */
> +    DPRINTF("%c", x);                   /* Output to stdout */
>  }
>  #endif
>  

Why is a TCG helper missing with curses directly? Shouldn't that use
QEMU's console infrastructure and leave it to the user whether to use
curses as a backend at runtime?

What is the problem you are trying to solve? If you just need scrolling
support you can already use -curses, -nographic and friends...

Regards,
Andreas

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