[Bug 46441] sh(1): Does not support PS1, PS2, PS4 parameter expansion

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=46441

Piotr Pawel Stefaniak <pstef@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |pstef@freebsd.org

--- Comment #13 from Piotr Pawel Stefaniak <pstef@freebsd.org> ---
(In reply to Nathaniel Barragan from comment #11)
I tried the naive approach to make the parser re-entrant by doing something
like this

static struct state {
  struct heredoc *heredoclist;  /* list of here documents to read */
  int doprompt;         /* if set, prompt the user */
  int needprompt;               /* true if interactive and at start of line */
  int lasttoken;                /* last token read */
  int tokpushback;              /* last token pushed back */
  char *wordtext;               /* text of last word returned by readtoken */
  int checkkwd;
  struct nodelist *backquotelist;
  union node *redirnode;
  struct heredoc *heredoc;
  int quoteflag;                /* set if (part of) last token was quoted */
  int startlinno;               /* line # where last token started */
  int funclinno;                /* line # where the current function started */
  struct parser_temp *parser_temp;
} states[2];
static size_t current;

then referring to the fields in states[current] in place of the formerly file
scope identifiers, and also incrementing/decrementing current at the right
times. 

But I'm not exactly sure when those are. Also, there's the problem of expdest
invalidation on multiple calls to expandarg.

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