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    Subject[PATCH] Fix to virtual terminal UTF-8 mode handling
    This patch fixes a bug in the virtual terminal driver, whereby the UTF-8
    mode is reset to "off" following a console reset, such as might be
    delivered by mingetty, screen, vim, etc...

    Rather than resetting to hardcoded "0", it gets reset on or off, as
    determined by a new sysctl located in /proc/tty/vt/default_utf8_mode.
    This patch is best accompanied with an addition of the following line to
    the system's init scripts:

    echo 1 >/proc/tty/vt/default_utf8_mode

    Following this, all resets to the console will leave it with UTF-8 mode
    on.

    The default behaviour of this sysctl is as before, without the patch.
    Namely, UTF-8 mode is switched off on reset. [I.e applying this patch
    does not affect default behaviour].


    Signed-off-by: Paul Evans <leonerd@leonerd.org.uk>


    --- linux-2.6.11/drivers/char/vt.c 2005-05-04 02:01:08.000000000
    +0100 +++ linux-2.6.11-utfswitch/drivers/char/vt.c 2005-05-07
    22:41:58.000000000 +0100 @@ -93,6 +93,7 @@
    #include <linux/pm.h>
    #include <linux/font.h>
    #include <linux/bitops.h>
    +#include <linux/proc_fs.h>

    #include <asm/io.h>
    #include <asm/system.h>
    @@ -162,6 +163,15 @@
    static int blankinterval = 10*60*HZ;
    static int vesa_off_interval;

    +/*
    + * When resetting a console, do we start in UTF-8 mode or not?
    + * 0 = no, 1 = yes
    + */
    +static int default_utf8_mode = 0;
    +
    +struct proc_dir_entry *proc_vt_dir;
    +struct proc_dir_entry *proc_default_utf8_mode;
    +
    static DECLARE_WORK(console_work, console_callback, NULL);

    /*
    @@ -1472,7 +1482,7 @@
    charset = 0;
    need_wrap = 0;
    report_mouse = 0;
    - utf = 0;
    + utf = default_utf8_mode;
    utf_count = 0;

    disp_ctrl = 0;
    @@ -2530,6 +2540,63 @@
    reset_terminal(currcons, do_clear);
    }

    +static int proc_write_default_utf8_mode(struct file *file, const char
    *buffer,
    + unsigned long count, void *data)
    +{
    + char temp[16];
    + int len;
    +
    + if (count > sizeof(temp)-1)
    + len = sizeof(temp)-1;
    + else
    + len = count;
    +
    + if (copy_from_user(temp, buffer, len))
    + return -EFAULT;
    +
    + temp[len] = 0;
    +
    + /* No effect if empty or >1 character long */
    + if (temp[0] == 0 || (temp[1] != '\n' && temp[1] != 0)) {
    + return len;
    + }
    +
    + /* No effect if outside the range 0<=x<=1 */
    + if (temp[0] < '0' || temp[0] > '1') {
    + return len;
    + }
    +
    + default_utf8_mode = (temp[0] - '0');
    +
    + return len;
    +}
    +
    +static int proc_read_default_utf8_mode(char *page, char **start, off_t
    off,
    + int count, int *eof, void *data)
    +{
    + return sprintf(page, "default_utf8_mode = %d\n",
    default_utf8_mode); +}
    +
    +static int init_proc(void)
    +{
    + proc_vt_dir = proc_mkdir("tty/vt", NULL);
    +
    + if (!proc_vt_dir)
    + return -ENOMEM;
    +
    + proc_default_utf8_mode = create_proc_entry("default_utf8_mode",
    0644, proc_vt_dir); +
    + if (!proc_default_utf8_mode)
    + return -ENOMEM;
    +
    + proc_default_utf8_mode->owner = THIS_MODULE;
    + proc_default_utf8_mode->data = &default_utf8_mode;
    + proc_default_utf8_mode->write_proc =
    proc_write_default_utf8_mode;
    + proc_default_utf8_mode->read_proc = proc_read_default_utf8_mode;
    +
    + return 0;
    +}
    +
    /*
    * This routine initializes console interrupts, and does nothing
    * else. If you want the screen to clear, call tty_write with
    @@ -2612,6 +2679,8 @@

    int __init vty_init(void)
    {
    + int ret;
    +
    vcs_init();

    console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
    @@ -2638,6 +2707,11 @@
    #ifdef CONFIG_MDA_CONSOLE
    mda_console_init();
    #endif
    +
    + ret = init_proc();
    + if (ret)
    + return ret;
    +
    return 0;
    }


    --
    Paul "LeoNerd" Evans

    leonerd@leonerd.org.uk
    ICQ# 4135350 | Registered Linux# 179460
    http://www.leonerd.org.uk/[unhandled content-type:application/pgp-signature]
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