[Bug 249620] Re: dash does not support multi-digit file descriptors

[jwater7]

One larger side effect of not supporting more fds is that the use of
multi volume info script in tar fails (as in their example)

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https://bugs.launchpad.net/bugs/249620

Title:
  dash does not support multi-digit file descriptors

Status in dash package in Ubuntu:
  Confirmed
Status in dash package in Debian:
  Confirmed

Bug description:
  Binary package hint: dash

  Found in dash version 0.5.4-8ubuntu1.

  The POSIX specification for "Shell Command Language" at
  http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_07
  says that multi-digit file descriptors are allowed, i.e. 10, 20, 25,
  etc..

  The relevant part of the specification is
  "The redirection operator:

  [n]>&word

  shall duplicate one output file descriptor from another, or shall
  close one. If word evaluates to one or more digits, the file
  descriptor denoted by n, or standard output if n is not specified,
  shall be made to be a copy of the file descriptor denoted by word ..."

  Dash seems to only support single digit fds:
  kstemen at kyle-vmserver:~$ sh 3>3.txt 9>9.txt 10>10.txt 11>11.txt
  $ ls /proc/$$/fd
  0  1  10  11  12  2  3  9
  $ echo test >&3
  $ echo test >&9
  $ echo test >&10
  sh: Syntax error: Bad fd number
  $ echo test >&11
  sh: Syntax error: Bad fd number
  $ 

  This seems to be caused by fixredir in parser.c:
  void fixredir(union node *n, const char *text, int err)
      {
      TRACE(("Fix redir %s %d\n", text, err));
      if (!err)
          n->ndup.vname = NULL;

      if (is_digit(text[0]) && text[1] == '\0')
          n->ndup.dupfd = digit_val(text[0]);
      else if (text[0] == '-' && text[1] == '\0')
          n->ndup.dupfd = -1;
      else {

          if (err)
              synerror("Bad fd number");
          else
              n->ndup.vname = makename();
      }
  }

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