patch 9.0.2123: Problem with initializing the length of range() lists Commit: https://github.com/vim/vim/commit/df63da98d8dc284b1c76cfe1b17fa0acbd6094d8 Author: Christian Brabandt <cb@256bit.org> Date: Thu Nov 23 20:14:28 2023 +0100 patch 9.0.2123: Problem with initializing the length of range() lists Problem: Problem with initializing the length of range() lists Solution: Set length explicitly when it shouldn't contain any items range() may cause a wrong calculation of list length, which may later then cause a segfault in list_find(). This is usually not a problem, because range_list_materialize() calculates the length, when it materializes the list. In addition, in list_find() when the length of the range was wrongly initialized, it may seem to be valid, so the check for list index out-of-bounds will not be true, because it is called before the list is actually materialized. And so we may eventually try to access a null pointer, causing a segfault. So this patch does 3 things: - In f_range(), when we know that the list should be empty, explicitly set the list->lv_len value to zero. This should happen, when start is larger than end (in case the stride is positive) or end is larger than start when the stride is negative. This should fix the underlying issue properly. However, - as a safety measure, let's check that the requested index is not out of range one more time, after the list has been materialized and return NULL in case it suddenly is. - add a few more tests to verify the behaviour. fixes: #13557 closes: #13563 Co-authored-by: Tim Pope <tpope@github.com> Signed-off-by: Christian Brabandt <cb@256bit.org>

" PostScript indent file
" Language:	PostScript
" Maintainer:	Mike Williams <mrw@eandem.co.uk>
" Last Change:	2022 Apr 06

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentexpr=PostscrIndentGet(v:lnum)
setlocal indentkeys+=0],0=>>,0=%%,0=end,0=restore,0=grestore indentkeys-=:,0#,e

let b:undo_indent = "setl inde< indk<"

" Catch multiple instantiations
if exists("*PostscrIndentGet")
  finish
endif

function! PostscrIndentGet(lnum)
  " Find a non-empty non-comment line above the current line.
  " Note: ignores DSC comments as well!
  let lnum = a:lnum - 1
  while lnum != 0
    let lnum = prevnonblank(lnum)
    if getline(lnum) !~ '^\s*%.*$'
      break
    endif
    let lnum = lnum - 1
  endwhile

  " Hit the start of the file, use user indent.
  if lnum == 0
    return -1
  endif

  " Start with the indent of the previous line
  let ind = indent(lnum)
  let pline = getline(lnum)

  " Indent for dicts, arrays, and saves with possible trailing comment
  if pline =~ '\(begin\|<<\|g\=save\|{\|[\)\s*\(%.*\)\=$'
    let ind = ind + shiftwidth()
  endif

  " Remove indent for popped dicts, and restores.
  if pline =~ '\(end\|g\=restore\)\s*$'
    let ind = ind - shiftwidth()

  " Else handle immediate dedents of dicts, restores, and arrays.
  elseif getline(a:lnum) =~ '\(end\|>>\|g\=restore\|}\|]\)'
    let ind = ind - shiftwidth()

  " Else handle DSC comments - always start of line.
  elseif getline(a:lnum) =~ '^\s*%%'
    let ind = 0
  endif

  " For now catch excessive left indents if they occur.
  if ind < 0
    let ind = -1
  endif

  return ind
endfunction

" vim:sw=2