Readline-5.1 Official Patch 4

[Chet Ramey]

                           READLINE PATCH REPORT
                           =====================

Readline-Release: 5.1
Patch-ID: readline51-004

Bug-Reported-by: Mike Stroyan <mike.stroyan@hp.com>
Bug-Reference-ID: <20060203191607.GC27614@localhost>
Bug-Reference-URL: 
http://lists.gnu.org/archive/html/bug-bash/2006-02/msg00004.html

Bug-Description:

The displayed search prompt is corrupted when using non-incremental
searches in vi and emacs mode if the prompt contains non-printing
characters or spans multiple lines.  The prompt is expanded more than
once; the second time without the escape sequences that protect non-
printing characters from the length calculations.

Patch:

*** ../readline-5.1-patched/display.c   Wed Nov 30 14:05:02 2005
--- display.c   Sat Feb 18 12:14:58 2006
***************
*** 1983,1993 ****
       int pchar;
  {
    int len;
!   char *pmt;
  
    rl_save_prompt ();
  
!   if (saved_local_prompt == 0)
      {
        len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
        pmt = (char *)xmalloc (len + 2);
--- 1998,2012 ----
       int pchar;
  {
    int len;
!   char *pmt, *p;
  
    rl_save_prompt ();
  
!   /* We've saved the prompt, and can do anything with the various prompt
!      strings we need before they're restored.  We want the unexpanded
!      portion of the prompt string after any final newline. */
!   p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
!   if (p == 0)
      {
        len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
        pmt = (char *)xmalloc (len + 2);
***************
*** 1998,2016 ****
      }
    else
      {
!       len = *saved_local_prompt ? strlen (saved_local_prompt) : 0;
        pmt = (char *)xmalloc (len + 2);
        if (len)
!       strcpy (pmt, saved_local_prompt);
        pmt[len] = pchar;
        pmt[len+1] = '\0';
!       local_prompt = savestring (pmt);
!       prompt_last_invisible = saved_last_invisible;
!       prompt_visible_length = saved_visible_length + 1;
!     }
  
    prompt_physical_chars = saved_physical_chars + 1;
- 
    return pmt;
  }
  
--- 2017,2033 ----
      }
    else
      {
!       p++;
!       len = strlen (p);
        pmt = (char *)xmalloc (len + 2);
        if (len)
!       strcpy (pmt, p);
        pmt[len] = pchar;
        pmt[len+1] = '\0';
!     }  
  
+   /* will be overwritten by expand_prompt, called from rl_message */
    prompt_physical_chars = saved_physical_chars + 1;
    return pmt;
  }
  

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
                                       Live Strong.  No day but today.
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/