NetBSD Problem Report #57860

From www@netbsd.org  Mon Jan 15 21:34:39 2024
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Message-Id: <20240115213437.72B261A9255@mollari.NetBSD.org>
Date: Mon, 15 Jan 2024 21:07:35 +0000 (UTC)
From: achowe@snert.com
Reply-To: achowe@snert.com
To: gnats-bugs@NetBSD.org
Subject: Curses getnstr() family handling of kill char (^U) not correct.
X-Send-Pr-Version: www-1.0

>Number:         57860
>Category:       lib
>Synopsis:       Curses getnstr() family handling of kill char (^U) not correct.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 15 21:35:00 +0000 2024
>Last-Modified:  Sun Apr 14 13:15:01 +0000 2024
>Originator:     Anthony Howe
>Release:        9.3
>Organization:
>Environment:
NetBSD elf.snert.com 9.3 NetBSD 9.3 (GENERIC) #0: Thu Aug  4 15:30:37 UTC 2022  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
Entering text into a field with Curses getnstr() family of functions does not correct handle the behaviour of ^U kill char.   
>How-To-Repeat:
Short test program, instructions at end:
```
#include <curses.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
        char buf[80];
        if (initscr() == NULL) {
                return 1;
        }
        echo();
        cbreak();
        addstr(" 123456789.123456789.123456789.1234567890\n");
        standout();
        addstr("[                                        ]\n");
        mvgetnstr(1, 1, buf, sizeof (buf));
        standend();
        endwin();
        return 0;
}

/*
Type in a string like "abcdefghi", ^U, 1234.
Observe how there is a gap between 1 and 2.
Appears kill char ^U not handled properly.
Backspace / erase char (^H) works just fine.
*/
```

>Fix:

>Audit-Trail:
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: lib/57860: Curses getnstr() family handling of kill char (^U)
 not correct.
Date: Wed, 17 Jan 2024 07:07:36 +0000 (UTC)

 On Mon, 15 Jan 2024, achowe@snert.com wrote:

 >> Description:
 > Entering text into a field with Curses getnstr() family of functions does not correct handle the behaviour of ^U kill char.
 >

 Please try this. It should tide you over until this gets fixed properly (the
 *getnstr() don't look right with keypad(TRUE), for example).

 ```
 diff -urN a/lib/libcurses/getstr.c b/lib/libcurses/getstr.c
 --- a/lib/libcurses/getstr.c	2021-09-06 07:03:49.000000000 +0000
 +++ b/lib/libcurses/getstr.c	2024-01-17 06:37:43.889003732 +0000
 @@ -222,7 +222,7 @@
   					mvwaddch(win, win->cury, win->curx - 1,
   					    ' ');
   					wmove(win, win->cury, win->curx - 1);
 -					str--;
 +					xpos--; str--;
   					if (n != -1)
   						/* We're counting chars */
   						remain++;
 ```

 -RVP

From: Anthony Howe <achowe@snert.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: lib/57860: Curses getnstr() family handling of kill char (^U) not
 correct.
Date: Sun, 14 Apr 2024 09:07:55 -0400

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 To: gnats-bugs@netbsd.org
 Message-ID: <7b0cc92a-aa63-4f66-8f43-d99162da2893@snert.com>
 Subject: Re: lib/57860: Curses getnstr() family handling of kill char (^U) not
  correct.
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  <20240115213437.72B261A9255@mollari.NetBSD.org>
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From: Anthony Howe <achowe@snert.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: lib/57860: Curses getnstr() family handling of kill char (^U) not
 correct.
Date: Sun, 14 Apr 2024 09:11:49 -0400

 This issue remains unfixed in NetBSD 10.0.


 -- 
 Anthony C Howe
 achowe@snert.com                                   BarricadeMX & Milters
 http://nanozen.snert.com/                          http://software.snert.com/

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