Rename catsh to 1sh

Yes it's another rename because I felt like catsh was too long. 1sh is
short and unique.

1 files changed, 0 insertions, 2170 deletions

diff --git a/bin/catsh/parser.c b/bin/catsh/parser.c
deleted file mode 100644
index 377ab78f..00000000
--- a/bin/catsh/parser.c
+++ /dev/null
@@ -1,2170 +0,0 @@
-/*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1991, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Kenneth Almquist.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef lint
-#if 0
-static char sccsid[] = "@(#)parser.c	8.7 (Berkeley) 5/16/95";
-#endif
-#endif /* not lint */
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD: releng/12.0/bin/sh/parser.c 334008 2018-05-21 21:52:48Z jilles $");
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-
-#include "shell.h"
-#include "parser.h"
-#include "nodes.h"
-#include "expand.h"	/* defines rmescapes() */
-#include "syntax.h"
-#include "options.h"
-#include "input.h"
-#include "output.h"
-#include "var.h"
-#include "error.h"
-#include "memalloc.h"
-#include "mystring.h"
-#include "alias.h"
-#include "show.h"
-#include "eval.h"
-#include "exec.h"	/* to check for special builtins */
-#ifndef NO_HISTORY
-#include "myhistedit.h"
-#endif
-
-/*
- * Shell command parser.
- */
-
-#define	PROMPTLEN	128
-
-/* values of checkkwd variable */
-#define CHKALIAS	0x1
-#define CHKKWD		0x2
-#define CHKNL		0x4
-
-/* values returned by readtoken */
-#include "token.h"
-
-
-
-struct heredoc {
-	struct heredoc *next;	/* next here document in list */
-	union node *here;		/* redirection node */
-	char *eofmark;		/* string indicating end of input */
-	int striptabs;		/* if set, strip leading tabs */
-};
-
-struct parser_temp {
-	struct parser_temp *next;
-	void *data;
-};
-
-
-static struct heredoc *heredoclist;	/* list of here documents to read */
-static int doprompt;		/* if set, prompt the user */
-static int needprompt;		/* true if interactive and at start of line */
-static int lasttoken;		/* last token read */
-static int tokpushback;		/* last token pushed back */
-static char *wordtext;		/* text of last word returned by readtoken */
-static int checkkwd;
-static struct nodelist *backquotelist;
-static union node *redirnode;
-static struct heredoc *heredoc;
-static int quoteflag;		/* set if (part of) last token was quoted */
-static int startlinno;		/* line # where last token started */
-static int funclinno;		/* line # where the current function started */
-static struct parser_temp *parser_temp;
-
-#define NOEOFMARK ((const char *)&heredoclist)
-
-
-static union node *list(int);
-static union node *andor(void);
-static union node *pipeline(void);
-static union node *command(void);
-static union node *simplecmd(union node **, union node *);
-static union node *makename(void);
-static union node *makebinary(int type, union node *n1, union node *n2);
-static void parsefname(void);
-static void parseheredoc(void);
-static int peektoken(void);
-static int readtoken(void);
-static int xxreadtoken(void);
-static int readtoken1(int, const char *, const char *, int);
-static int noexpand(char *);
-static void consumetoken(int);
-static void synexpect(int) __dead2;
-static void synerror(const char *) __dead2;
-static void setprompt(int);
-static char *expandprompt(const char *);
-static int pgetc_linecont(void);
-
-
-static void *
-parser_temp_alloc(size_t len)
-{
-	struct parser_temp *t;
-
-	INTOFF;
-	t = ckmalloc(sizeof(*t));
-	t->data = NULL;
-	t->next = parser_temp;
-	parser_temp = t;
-	t->data = ckmalloc(len);
-	INTON;
-	return t->data;
-}
-
-
-static void *
-parser_temp_realloc(void *ptr, size_t len)
-{
-	struct parser_temp *t;
-
-	INTOFF;
-	t = parser_temp;
-	if (ptr != t->data)
-		error("bug: parser_temp_realloc misused");
-	t->data = ckrealloc(t->data, len);
-	INTON;
-	return t->data;
-}
-
-
-static void
-parser_temp_free_upto(void *ptr)
-{
-	struct parser_temp *t;
-	int done = 0;
-
-	INTOFF;
-	while (parser_temp != NULL && !done) {
-		t = parser_temp;
-		parser_temp = t->next;
-		done = t->data == ptr;
-		ckfree(t->data);
-		ckfree(t);
-	}
-	INTON;
-	if (!done)
-		error("bug: parser_temp_free_upto misused");
-}
-
-
-static void
-parser_temp_free_all(void)
-{
-	struct parser_temp *t;
-
-	INTOFF;
-	while (parser_temp != NULL) {
-		t = parser_temp;
-		parser_temp = t->next;
-		ckfree(t->data);
-		ckfree(t);
-	}
-	INTON;
-}
-
-
-/*
- * Read and parse a command.  Returns NEOF on end of file.  (NULL is a
- * valid parse tree indicating a blank line.)
- */
-
-union node *
-parsecmd(int interact)
-{
-	int t;
-
-	/* This assumes the parser is not re-entered,
-	 * which could happen if we add command substitution on PS1/PS2.
-	 */
-	parser_temp_free_all();
-	heredoclist = NULL;
-
-	tokpushback = 0;
-	checkkwd = 0;
-	doprompt = interact;
-	if (doprompt)
-		setprompt(1);
-	else
-		setprompt(0);
-	needprompt = 0;
-	t = readtoken();
-	if (t == TEOF)
-		return NEOF;
-	if (t == TNL)
-		return NULL;
-	tokpushback++;
-	return list(1);
-}
-
-
-/*
- * Read and parse words for wordexp.
- * Returns a list of NARG nodes; NULL if there are no words.
- */
-union node *
-parsewordexp(void)
-{
-	union node *n, *first = NULL, **pnext;
-	int t;
-
-	/* This assumes the parser is not re-entered,
-	 * which could happen if we add command substitution on PS1/PS2.
-	 */
-	parser_temp_free_all();
-	heredoclist = NULL;
-
-	tokpushback = 0;
-	checkkwd = 0;
-	doprompt = 0;
-	setprompt(0);
-	needprompt = 0;
-	pnext = &first;
-	while ((t = readtoken()) != TEOF) {
-		if (t != TWORD)
-			synexpect(TWORD);
-		n = makename();
-		*pnext = n;
-		pnext = &n->narg.next;
-	}
-	return first;
-}
-
-
-static union node *
-list(int nlflag)
-{
-	union node *ntop, *n1, *n2, *n3;
-	int tok;
-
-	checkkwd = CHKNL | CHKKWD | CHKALIAS;
-	if (!nlflag && tokendlist[peektoken()])
-		return NULL;
-	ntop = n1 = NULL;
-	for (;;) {
-		n2 = andor();
-		tok = readtoken();
-		if (tok == TBACKGND) {
-			if (n2 != NULL && n2->type == NPIPE) {
-				n2->npipe.backgnd = 1;
-			} else if (n2 != NULL && n2->type == NREDIR) {
-				n2->type = NBACKGND;
-			} else {
-				n3 = (union node *)stalloc(sizeof (struct nredir));
-				n3->type = NBACKGND;
-				n3->nredir.n = n2;
-				n3->nredir.redirect = NULL;
-				n2 = n3;
-			}
-		}
-		if (ntop == NULL)
-			ntop = n2;
-		else if (n1 == NULL) {
-			n1 = makebinary(NSEMI, ntop, n2);
-			ntop = n1;
-		}
-		else {
-			n3 = makebinary(NSEMI, n1->nbinary.ch2, n2);
-			n1->nbinary.ch2 = n3;
-			n1 = n3;
-		}
-		switch (tok) {
-		case TBACKGND:
-		case TSEMI:
-			tok = readtoken();
-			/* FALLTHROUGH */
-		case TNL:
-			if (tok == TNL) {
-				parseheredoc();
-				if (nlflag)
-					return ntop;
-			} else if (tok == TEOF && nlflag) {
-				parseheredoc();
-				return ntop;
-			} else {
-				tokpushback++;
-			}
-			checkkwd = CHKNL | CHKKWD | CHKALIAS;
-			if (!nlflag && tokendlist[peektoken()])
-				return ntop;
-			break;
-		case TEOF:
-			if (heredoclist)
-				parseheredoc();
-			else
-				pungetc();		/* push back EOF on input */
-			return ntop;
-		default:
-			if (nlflag)
-				synexpect(-1);
-			tokpushback++;
-			return ntop;
-		}
-	}
-}
-
-
-
-static union node *
-andor(void)
-{
-	union node *n;
-	int t;
-
-	n = pipeline();
-	for (;;) {
-		if ((t = readtoken()) == TAND) {
-			t = NAND;
-		} else if (t == TOR) {
-			t = NOR;
-		} else {
-			tokpushback++;
-			return n;
-		}
-		n = makebinary(t, n, pipeline());
-	}
-}
-
-
-
-static union node *
-pipeline(void)
-{
-	union node *n1, *n2, *pipenode;
-	struct nodelist *lp, *prev;
-	int negate, t;
-
-	negate = 0;
-	checkkwd = CHKNL | CHKKWD | CHKALIAS;
-	TRACE(("pipeline: entered\n"));
-	while (readtoken() == TNOT)
-		negate = !negate;
-	tokpushback++;
-	n1 = command();
-	if (readtoken() == TPIPE) {
-		pipenode = (union node *)stalloc(sizeof (struct npipe));
-		pipenode->type = NPIPE;
-		pipenode->npipe.backgnd = 0;
-		lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
-		pipenode->npipe.cmdlist = lp;
-		lp->n = n1;
-		do {
-			prev = lp;
-			lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
-			checkkwd = CHKNL | CHKKWD | CHKALIAS;
-			t = readtoken();
-			tokpushback++;
-			if (t == TNOT)
-				lp->n = pipeline();
-			else
-				lp->n = command();
-			prev->next = lp;
-		} while (readtoken() == TPIPE);
-		lp->next = NULL;
-		n1 = pipenode;
-	}
-	tokpushback++;
-	if (negate) {
-		n2 = (union node *)stalloc(sizeof (struct nnot));
-		n2->type = NNOT;
-		n2->nnot.com = n1;
-		return n2;
-	} else
-		return n1;
-}
-
-
-
-static union node *
-command(void)
-{
-	union node *n1, *n2;
-	union node *ap, **app;
-	union node *cp, **cpp;
-	union node *redir, **rpp;
-	int t;
-	int is_subshell;
-
-	checkkwd = CHKNL | CHKKWD | CHKALIAS;
-	is_subshell = 0;
-	redir = NULL;
-	n1 = NULL;
-	rpp = &redir;
-
-	/* Check for redirection which may precede command */
-	while (readtoken() == TREDIR) {
-		*rpp = n2 = redirnode;
-		rpp = &n2->nfile.next;
-		parsefname();
-	}
-	tokpushback++;
-
-	switch (readtoken()) {
-	case TIF:
-		n1 = (union node *)stalloc(sizeof (struct nif));
-		n1->type = NIF;
-		if ((n1->nif.test = list(0)) == NULL)
-			synexpect(-1);
-		consumetoken(TTHEN);
-		n1->nif.ifpart = list(0);
-		n2 = n1;
-		while (readtoken() == TELIF) {
-			n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
-			n2 = n2->nif.elsepart;
-			n2->type = NIF;
-			if ((n2->nif.test = list(0)) == NULL)
-				synexpect(-1);
-			consumetoken(TTHEN);
-			n2->nif.ifpart = list(0);
-		}
-		if (lasttoken == TELSE)
-			n2->nif.elsepart = list(0);
-		else {
-			n2->nif.elsepart = NULL;
-			tokpushback++;
-		}
-		consumetoken(TFI);
-		checkkwd = CHKKWD | CHKALIAS;
-		break;
-	case TWHILE:
-	case TUNTIL:
-		t = lasttoken;
-		if ((n1 = list(0)) == NULL)
-			synexpect(-1);
-		consumetoken(TDO);
-		n1 = makebinary((t == TWHILE)? NWHILE : NUNTIL, n1, list(0));
-		consumetoken(TDONE);
-		checkkwd = CHKKWD | CHKALIAS;
-		break;
-	case TFOR:
-		if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
-			synerror("Bad for loop variable");
-		n1 = (union node *)stalloc(sizeof (struct nfor));
-		n1->type = NFOR;
-		n1->nfor.var = wordtext;
-		while (readtoken() == TNL)
-			;
-		if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) {
-			app = &ap;
-			while (readtoken() == TWORD) {
-				n2 = makename();
-				*app = n2;
-				app = &n2->narg.next;
-			}
-			*app = NULL;
-			n1->nfor.args = ap;
-			if (lasttoken != TNL && lasttoken != TSEMI)
-				synexpect(-1);
-		} else {
-			static char argvars[5] = {
-				CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
-			};
-			n2 = (union node *)stalloc(sizeof (struct narg));
-			n2->type = NARG;
-			n2->narg.text = argvars;
-			n2->narg.backquote = NULL;
-			n2->narg.next = NULL;
-			n1->nfor.args = n2;
-			/*
-			 * Newline or semicolon here is optional (but note
-			 * that the original Bourne shell only allowed NL).
-			 */
-			if (lasttoken != TNL && lasttoken != TSEMI)
-				tokpushback++;
-		}
-		checkkwd = CHKNL | CHKKWD | CHKALIAS;
-		if ((t = readtoken()) == TDO)
-			t = TDONE;
-		else if (t == TBEGIN)
-			t = TEND;
-		else
-			synexpect(-1);
-		n1->nfor.body = list(0);
-		consumetoken(t);
-		checkkwd = CHKKWD | CHKALIAS;
-		break;
-	case TCASE:
-		n1 = (union node *)stalloc(sizeof (struct ncase));
-		n1->type = NCASE;
-		consumetoken(TWORD);
-		n1->ncase.expr = makename();
-		while (readtoken() == TNL);
-		if (lasttoken != TWORD || ! equal(wordtext, "in"))
-			synerror("expecting \"in\"");
-		cpp = &n1->ncase.cases;
-		checkkwd = CHKNL | CHKKWD, readtoken();
-		while (lasttoken != TESAC) {
-			*cpp = cp = (union node *)stalloc(sizeof (struct nclist));
-			cp->type = NCLIST;
-			app = &cp->nclist.pattern;
-			if (lasttoken == TLP)
-				readtoken();
-			for (;;) {
-				*app = ap = makename();
-				checkkwd = CHKNL | CHKKWD;
-				if (readtoken() != TPIPE)
-					break;
-				app = &ap->narg.next;
-				readtoken();
-			}
-			ap->narg.next = NULL;
-			if (lasttoken != TRP)
-				synexpect(TRP);
-			cp->nclist.body = list(0);
-
-			checkkwd = CHKNL | CHKKWD | CHKALIAS;
-			if ((t = readtoken()) != TESAC) {
-				if (t == TENDCASE)
-					;
-				else if (t == TFALLTHRU)
-					cp->type = NCLISTFALLTHRU;
-				else
-					synexpect(TENDCASE);
-				checkkwd = CHKNL | CHKKWD, readtoken();
-			}
-			cpp = &cp->nclist.next;
-		}
-		*cpp = NULL;
-		checkkwd = CHKKWD | CHKALIAS;
-		break;
-	case TLP:
-		n1 = (union node *)stalloc(sizeof (struct nredir));
-		n1->type = NSUBSHELL;
-		n1->nredir.n = list(0);
-		n1->nredir.redirect = NULL;
-		consumetoken(TRP);
-		checkkwd = CHKKWD | CHKALIAS;
-		is_subshell = 1;
-		break;
-	case TBEGIN:
-		n1 = list(0);
-		consumetoken(TEND);
-		checkkwd = CHKKWD | CHKALIAS;
-		break;
-	/* A simple command must have at least one redirection or word. */
-	case TBACKGND:
-	case TSEMI:
-	case TAND:
-	case TOR:
-	case TPIPE:
-	case TENDCASE:
-	case TFALLTHRU:
-	case TEOF:
-	case TNL:
-	case TRP:
-		if (!redir)
-			synexpect(-1);
-	case TWORD:
-		tokpushback++;
-		n1 = simplecmd(rpp, redir);
-		return n1;
-	default:
-		synexpect(-1);
-	}
-
-	/* Now check for redirection which may follow command */
-	while (readtoken() == TREDIR) {
-		*rpp = n2 = redirnode;
-		rpp = &n2->nfile.next;
-		parsefname();
-	}
-	tokpushback++;
-	*rpp = NULL;
-	if (redir) {
-		if (!is_subshell) {
-			n2 = (union node *)stalloc(sizeof (struct nredir));
-			n2->type = NREDIR;
-			n2->nredir.n = n1;
-			n1 = n2;
-		}
-		n1->nredir.redirect = redir;
-	}
-
-	return n1;
-}
-
-
-static union node *
-simplecmd(union node **rpp, union node *redir)
-{
-	union node *args, **app;
-	union node **orig_rpp = rpp;
-	union node *n = NULL;
-	int special;
-	int savecheckkwd;
-
-	/* If we don't have any redirections already, then we must reset */
-	/* rpp to be the address of the local redir variable.  */
-	if (redir == NULL)
-		rpp = &redir;
-
-	args = NULL;
-	app = &args;
-	/*
-	 * We save the incoming value, because we need this for shell
-	 * functions.  There can not be a redirect or an argument between
-	 * the function name and the open parenthesis.
-	 */
-	orig_rpp = rpp;
-
-	savecheckkwd = CHKALIAS;
-
-	for (;;) {
-		checkkwd = savecheckkwd;
-		if (readtoken() == TWORD) {
-			n = makename();
-			*app = n;
-			app = &n->narg.next;
-			if (savecheckkwd != 0 && !isassignment(wordtext))
-				savecheckkwd = 0;
-		} else if (lasttoken == TREDIR) {
-			*rpp = n = redirnode;
-			rpp = &n->nfile.next;
-			parsefname();	/* read name of redirection file */
-		} else if (lasttoken == TLP && app == &args->narg.next
-					    && rpp == orig_rpp) {
-			/* We have a function */
-			consumetoken(TRP);
-			funclinno = plinno;
-			/*
-			 * - Require plain text.
-			 * - Functions with '/' cannot be called.
-			 * - Reject name=().
-			 * - Reject ksh extended glob patterns.
-			 */
-			if (!noexpand(n->narg.text) || quoteflag ||
-			    strchr(n->narg.text, '/') ||
-			    strchr("!%*+-=?@}~",
-				n->narg.text[strlen(n->narg.text) - 1]))
-				synerror("Bad function name");
-			rmescapes(n->narg.text);
-			if (find_builtin(n->narg.text, &special) >= 0 &&
-			    special)
-				synerror("Cannot override a special builtin with a function");
-			n->type = NDEFUN;
-			n->narg.next = command();
-			funclinno = 0;
-			return n;
-		} else {
-			tokpushback++;
-			break;
-		}
-	}
-	*app = NULL;
-	*rpp = NULL;
-	n = (union node *)stalloc(sizeof (struct ncmd));
-	n->type = NCMD;
-	n->ncmd.args = args;
-	n->ncmd.redirect = redir;
-	return n;
-}
-
-static union node *
-makename(void)
-{
-	union node *n;
-
-	n = (union node *)stalloc(sizeof (struct narg));
-	n->type = NARG;
-	n->narg.next = NULL;
-	n->narg.text = wordtext;
-	n->narg.backquote = backquotelist;
-	return n;
-}
-
-static union node *
-makebinary(int type, union node *n1, union node *n2)
-{
-	union node *n;
-
-	n = (union node *)stalloc(sizeof (struct nbinary));
-	n->type = type;
-	n->nbinary.ch1 = n1;
-	n->nbinary.ch2 = n2;
-	return (n);
-}
-
-void
-forcealias(void)
-{
-	checkkwd |= CHKALIAS;
-}
-
-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();
-	}
-}
-
-
-static void
-parsefname(void)
-{
-	union node *n = redirnode;
-
-	consumetoken(TWORD);
-	if (n->type == NHERE) {
-		struct heredoc *here = heredoc;
-		struct heredoc *p;
-
-		if (quoteflag == 0)
-			n->type = NXHERE;
-		TRACE(("Here document %d\n", n->type));
-		if (here->striptabs) {
-			while (*wordtext == '\t')
-				wordtext++;
-		}
-		if (! noexpand(wordtext))
-			synerror("Illegal eof marker for << redirection");
-		rmescapes(wordtext);
-		here->eofmark = wordtext;
-		here->next = NULL;
-		if (heredoclist == NULL)
-			heredoclist = here;
-		else {
-			for (p = heredoclist ; p->next ; p = p->next);
-			p->next = here;
-		}
-	} else if (n->type == NTOFD || n->type == NFROMFD) {
-		fixredir(n, wordtext, 0);
-	} else {
-		n->nfile.fname = makename();
-	}
-}
-
-
-/*
- * Input any here documents.
- */
-
-static void
-parseheredoc(void)
-{
-	struct heredoc *here;
-	union node *n;
-
-	while (heredoclist) {
-		here = heredoclist;
-		heredoclist = here->next;
-		if (needprompt) {
-			setprompt(2);
-			needprompt = 0;
-		}
-		readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
-				here->eofmark, here->striptabs);
-		n = makename();
-		here->here->nhere.doc = n;
-	}
-}
-
-static int
-peektoken(void)
-{
-	int t;
-
-	t = readtoken();
-	tokpushback++;
-	return (t);
-}
-
-static int
-readtoken(void)
-{
-	int t;
-	struct alias *ap;
-#ifdef DEBUG
-	int alreadyseen = tokpushback;
-#endif
-
-	top:
-	t = xxreadtoken();
-
-	/*
-	 * eat newlines
-	 */
-	if (checkkwd & CHKNL) {
-		while (t == TNL) {
-			parseheredoc();
-			t = xxreadtoken();
-		}
-	}
-
-	/*
-	 * check for keywords and aliases
-	 */
-	if (t == TWORD && !quoteflag)
-	{
-		const char * const *pp;
-
-		if (checkkwd & CHKKWD)
-			for (pp = parsekwd; *pp; pp++) {
-				if (**pp == *wordtext && equal(*pp, wordtext))
-				{
-					lasttoken = t = pp - parsekwd + KWDOFFSET;
-					TRACE(("keyword %s recognized\n", tokname[t]));
-					goto out;
-				}
-			}
-		if (checkkwd & CHKALIAS &&
-		    (ap = lookupalias(wordtext, 1)) != NULL) {
-			pushstring(ap->val, strlen(ap->val), ap);
-			goto top;
-		}
-	}
-out:
-	if (t != TNOT)
-		checkkwd = 0;
-
-#ifdef DEBUG
-	if (!alreadyseen)
-	    TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
-	else
-	    TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
-#endif
-	return (t);
-}
-
-
-/*
- * Read the next input token.
- * If the token is a word, we set backquotelist to the list of cmds in
- *	backquotes.  We set quoteflag to true if any part of the word was
- *	quoted.
- * If the token is TREDIR, then we set redirnode to a structure containing
- *	the redirection.
- * In all cases, the variable startlinno is set to the number of the line
- *	on which the token starts.
- *
- * [Change comment:  here documents and internal procedures]
- * [Readtoken shouldn't have any arguments.  Perhaps we should make the
- *  word parsing code into a separate routine.  In this case, readtoken
- *  doesn't need to have any internal procedures, but parseword does.
- *  We could also make parseoperator in essence the main routine, and
- *  have parseword (readtoken1?) handle both words and redirection.]
- */
-
-#define RETURN(token)	return lasttoken = token
-
-static int
-xxreadtoken(void)
-{
-	int c;
-
-	if (tokpushback) {
-		tokpushback = 0;
-		return lasttoken;
-	}
-	if (needprompt) {
-		setprompt(2);
-		needprompt = 0;
-	}
-	startlinno = plinno;
-	for (;;) {	/* until token or start of word found */
-		c = pgetc_macro();
-		switch (c) {
-		case ' ': case '\t':
-			continue;
-		case '#':
-			while ((c = pgetc()) != '\n' && c != PEOF);
-			pungetc();
-			continue;
-		case '\\':
-			if (pgetc() == '\n') {
-				startlinno = ++plinno;
-				if (doprompt)
-					setprompt(2);
-				else
-					setprompt(0);
-				continue;
-			}
-			pungetc();
-			/* FALLTHROUGH */
-		default:
-			return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
-		case '\n':
-			plinno++;
-			needprompt = doprompt;
-			RETURN(TNL);
-		case PEOF:
-			RETURN(TEOF);
-		case '&':
-			if (pgetc_linecont() == '&')
-				RETURN(TAND);
-			pungetc();
-			RETURN(TBACKGND);
-		case '|':
-			if (pgetc_linecont() == '|')
-				RETURN(TOR);
-			pungetc();
-			RETURN(TPIPE);
-		case ';':
-			c = pgetc_linecont();
-			if (c == ';')
-				RETURN(TENDCASE);
-			else if (c == '&')
-				RETURN(TFALLTHRU);
-			pungetc();
-			RETURN(TSEMI);
-		case '(':
-			RETURN(TLP);
-		case ')':
-			RETURN(TRP);
-		}
-	}
-#undef RETURN
-}
-
-
-#define MAXNEST_static 8
-struct tokenstate
-{
-	const char *syntax; /* *SYNTAX */
-	int parenlevel; /* levels of parentheses in arithmetic */
-	enum tokenstate_category
-	{
-		TSTATE_TOP,
-		TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */
-		TSTATE_VAR_NEW, /* other ${var...}, own dquote state */
-		TSTATE_ARITH
-	} category;
-};
-
-
-/*
- * Check to see whether we are at the end of the here document.  When this
- * is called, c is set to the first character of the next input line.  If
- * we are at the end of the here document, this routine sets the c to PEOF.
- * The new value of c is returned.
- */
-
-static int
-checkend(int c, const char *eofmark, int striptabs)
-{
-	if (striptabs) {
-		while (c == '\t')
-			c = pgetc();
-	}
-	if (c == *eofmark) {
-		int c2;
-		const char *q;
-
-		for (q = eofmark + 1; c2 = pgetc(), *q != '\0' && c2 == *q; q++)
-			;
-		if ((c2 == PEOF || c2 == '\n') && *q == '\0') {
-			c = PEOF;
-			if (c2 == '\n') {
-				plinno++;
-				needprompt = doprompt;
-			}
-		} else {
-			pungetc();
-			pushstring(eofmark + 1, q - (eofmark + 1), NULL);
-		}
-	} else if (c == '\n' && *eofmark == '\0') {
-		c = PEOF;
-		plinno++;
-		needprompt = doprompt;
-	}
-	return (c);
-}
-
-
-/*
- * Parse a redirection operator.  The variable "out" points to a string
- * specifying the fd to be redirected.  The variable "c" contains the
- * first character of the redirection operator.
- */
-
-static void
-parseredir(char *out, int c)
-{
-	char fd = *out;
-	union node *np;
-
-	np = (union node *)stalloc(sizeof (struct nfile));
-	if (c == '>') {
-		np->nfile.fd = 1;
-		c = pgetc_linecont();
-		if (c == '>')
-			np->type = NAPPEND;
-		else if (c == '&')
-			np->type = NTOFD;
-		else if (c == '|')
-			np->type = NCLOBBER;
-		else {
-			np->type = NTO;
-			pungetc();
-		}
-	} else {	/* c == '<' */
-		np->nfile.fd = 0;
-		c = pgetc_linecont();
-		if (c == '<') {
-			if (sizeof (struct nfile) != sizeof (struct nhere)) {
-				np = (union node *)stalloc(sizeof (struct nhere));
-				np->nfile.fd = 0;
-			}
-			np->type = NHERE;
-			heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
-			heredoc->here = np;
-			if ((c = pgetc_linecont()) == '-') {
-				heredoc->striptabs = 1;
-			} else {
-				heredoc->striptabs = 0;
-				pungetc();
-			}
-		} else if (c == '&')
-			np->type = NFROMFD;
-		else if (c == '>')
-			np->type = NFROMTO;
-		else {
-			np->type = NFROM;
-			pungetc();
-		}
-	}
-	if (fd != '\0')
-		np->nfile.fd = digit_val(fd);
-	redirnode = np;
-}
-
-/*
- * Called to parse command substitutions.
- */
-
-static char *
-parsebackq(char *out, struct nodelist **pbqlist,
-		int oldstyle, int dblquote, int quoted)
-{
-	struct nodelist **nlpp;
-	union node *n;
-	char *volatile str;
-	struct jmploc jmploc;
-	struct jmploc *const savehandler = handler;
-	size_t savelen;
-	int saveprompt;
-	const int bq_startlinno = plinno;
-	char *volatile ostr = NULL;
-	struct parsefile *const savetopfile = getcurrentfile();
-	struct heredoc *const saveheredoclist = heredoclist;
-	struct heredoc *here;
-
-	str = NULL;
-	if (setjmp(jmploc.loc)) {
-		popfilesupto(savetopfile);
-		if (str)
-			ckfree(str);
-		if (ostr)
-			ckfree(ostr);
-		heredoclist = saveheredoclist;
-		handler = savehandler;
-		if (exception == EXERROR) {
-			startlinno = bq_startlinno;
-			synerror("Error in command substitution");
-		}
-		longjmp(handler->loc, 1);
-	}
-	INTOFF;
-	savelen = out - stackblock();
-	if (savelen > 0) {
-		str = ckmalloc(savelen);
-		memcpy(str, stackblock(), savelen);
-	}
-	handler = &jmploc;
-	heredoclist = NULL;
-	INTON;
-        if (oldstyle) {
-                /* We must read until the closing backquote, giving special
-                   treatment to some slashes, and then push the string and
-                   reread it as input, interpreting it normally.  */
-                char *oout;
-                int c;
-                int olen;
-
-
-                STARTSTACKSTR(oout);
-		for (;;) {
-			if (needprompt) {
-				setprompt(2);
-				needprompt = 0;
-			}
-			CHECKSTRSPACE(2, oout);
-			c = pgetc_linecont();
-			if (c == '`')
-				break;
-			switch (c) {
-			case '\\':
-				c = pgetc();
-                                if (c != '\\' && c != '`' && c != '$'
-                                    && (!dblquote || c != '"'))
-                                        USTPUTC('\\', oout);
-				break;
-
-			case '\n':
-				plinno++;
-				needprompt = doprompt;
-				break;
-
-			case PEOF:
-			        startlinno = plinno;
-				synerror("EOF in backquote substitution");
- 				break;
-
-			default:
-				break;
-			}
-			USTPUTC(c, oout);
-                }
-                USTPUTC('\0', oout);
-                olen = oout - stackblock();
-		INTOFF;
-		ostr = ckmalloc(olen);
-		memcpy(ostr, stackblock(), olen);
-		setinputstring(ostr, 1);
-		INTON;
-        }
-	nlpp = pbqlist;
-	while (*nlpp)
-		nlpp = &(*nlpp)->next;
-	*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
-	(*nlpp)->next = NULL;
-
-	if (oldstyle) {
-		saveprompt = doprompt;
-		doprompt = 0;
-	}
-
-	n = list(0);
-
-	if (oldstyle) {
-		if (peektoken() != TEOF)
-			synexpect(-1);
-		doprompt = saveprompt;
-	} else
-		consumetoken(TRP);
-
-	(*nlpp)->n = n;
-        if (oldstyle) {
-		/*
-		 * Start reading from old file again, ignoring any pushed back
-		 * tokens left from the backquote parsing
-		 */
-                popfile();
-		tokpushback = 0;
-	}
-	STARTSTACKSTR(out);
-	CHECKSTRSPACE(savelen + 1, out);
-	INTOFF;
-	if (str) {
-		memcpy(out, str, savelen);
-		STADJUST(savelen, out);
-		ckfree(str);
-		str = NULL;
-	}
-	if (ostr) {
-		ckfree(ostr);
-		ostr = NULL;
-	}
-	here = saveheredoclist;
-	if (here != NULL) {
-		while (here->next != NULL)
-			here = here->next;
-		here->next = heredoclist;
-		heredoclist = saveheredoclist;
-	}
-	handler = savehandler;
-	INTON;
-	if (quoted)
-		USTPUTC(CTLBACKQ | CTLQUOTE, out);
-	else
-		USTPUTC(CTLBACKQ, out);
-	return out;
-}
-
-
-/*
- * Called to parse a backslash escape sequence inside $'...'.
- * The backslash has already been read.
- */
-static char *
-readcstyleesc(char *out)
-{
-	int c, vc, i, n;
-	unsigned int v;
-
-	c = pgetc();
-	switch (c) {
-	case '\0':
-		synerror("Unterminated quoted string");
-	case '\n':
-		plinno++;
-		if (doprompt)
-			setprompt(2);
-		else
-			setprompt(0);
-		return out;
-	case '\\':
-	case '\'':
-	case '"':
-		v = c;
-		break;
-	case 'a': v = '\a'; break;
-	case 'b': v = '\b'; break;
-	case 'e': v = '\033'; break;
-	case 'f': v = '\f'; break;
-	case 'n': v = '\n'; break;
-	case 'r': v = '\r'; break;
-	case 't': v = '\t'; break;
-	case 'v': v = '\v'; break;
-	case 'x':
-		  v = 0;
-		  for (;;) {
-			  c = pgetc();
-			  if (c >= '0' && c <= '9')
-				  v = (v << 4) + c - '0';
-			  else if (c >= 'A' && c <= 'F')
-				  v = (v << 4) + c - 'A' + 10;
-			  else if (c >= 'a' && c <= 'f')
-				  v = (v << 4) + c - 'a' + 10;
-			  else
-				  break;
-		  }
-		  pungetc();
-		  break;
-	case '0': case '1': case '2': case '3':
-	case '4': case '5': case '6': case '7':
-		  v = c - '0';
-		  c = pgetc();
-		  if (c >= '0' && c <= '7') {
-			  v <<= 3;
-			  v += c - '0';
-			  c = pgetc();
-			  if (c >= '0' && c <= '7') {
-				  v <<= 3;
-				  v += c - '0';
-			  } else
-				  pungetc();
-		  } else
-			  pungetc();
-		  break;
-	case 'c':
-		  c = pgetc();
-		  if (c < 0x3f || c > 0x7a || c == 0x60)
-			  synerror("Bad escape sequence");
-		  if (c == '\\' && pgetc() != '\\')
-			  synerror("Bad escape sequence");
-		  if (c == '?')
-			  v = 127;
-		  else
-			  v = c & 0x1f;
-		  break;
-	case 'u':
-	case 'U':
-		  n = c == 'U' ? 8 : 4;
-		  v = 0;
-		  for (i = 0; i < n; i++) {
-			  c = pgetc();
-			  if (c >= '0' && c <= '9')
-				  v = (v << 4) + c - '0';
-			  else if (c >= 'A' && c <= 'F')
-				  v = (v << 4) + c - 'A' + 10;
-			  else if (c >= 'a' && c <= 'f')
-				  v = (v << 4) + c - 'a' + 10;
-			  else
-				  synerror("Bad escape sequence");
-		  }
-		  if (v == 0 || (v >= 0xd800 && v <= 0xdfff))
-			  synerror("Bad escape sequence");
-		  /* We really need iconv here. */
-		  if (initial_localeisutf8 && v > 127) {
-			  CHECKSTRSPACE(4, out);
-			  /*
-			   * We cannot use wctomb() as the locale may have
-			   * changed.
-			   */
-			  if (v <= 0x7ff) {
-				  USTPUTC(0xc0 | v >> 6, out);
-				  USTPUTC(0x80 | (v & 0x3f), out);
-				  return out;
-			  } else if (v <= 0xffff) {
-				  USTPUTC(0xe0 | v >> 12, out);
-				  USTPUTC(0x80 | ((v >> 6) & 0x3f), out);
-				  USTPUTC(0x80 | (v & 0x3f), out);
-				  return out;
-			  } else if (v <= 0x10ffff) {
-				  USTPUTC(0xf0 | v >> 18, out);
-				  USTPUTC(0x80 | ((v >> 12) & 0x3f), out);
-				  USTPUTC(0x80 | ((v >> 6) & 0x3f), out);
-				  USTPUTC(0x80 | (v & 0x3f), out);
-				  return out;
-			  }
-		  }
-		  if (v > 127)
-			  v = '?';
-		  break;
-	default:
-		  synerror("Bad escape sequence");
-	}
-	vc = (char)v;
-	/*
-	 * We can't handle NUL bytes.
-	 * POSIX says we should skip till the closing quote.
-	 */
-	if (vc == '\0') {
-		while ((c = pgetc()) != '\'') {
-			if (c == '\\')
-				c = pgetc();
-			if (c == PEOF)
-				synerror("Unterminated quoted string");
-			if (c == '\n') {
-				plinno++;
-				if (doprompt)
-					setprompt(2);
-				else
-					setprompt(0);
-			}
-		}
-		pungetc();
-		return out;
-	}
-	if (SQSYNTAX[vc] == CCTL)
-		USTPUTC(CTLESC, out);
-	USTPUTC(vc, out);
-	return out;
-}
-
-
-/*
- * If eofmark is NULL, read a word or a redirection symbol.  If eofmark
- * is not NULL, read a here document.  In the latter case, eofmark is the
- * word which marks the end of the document and striptabs is true if
- * leading tabs should be stripped from the document.  The argument firstc
- * is the first character of the input token or document.
- *
- * Because C does not have internal subroutines, I have simulated them
- * using goto's to implement the subroutine linkage.  The following macros
- * will run code that appears at the end of readtoken1.
- */
-
-#define PARSESUB()	{goto parsesub; parsesub_return:;}
-#define	PARSEARITH()	{goto parsearith; parsearith_return:;}
-
-static int
-readtoken1(int firstc, char const *initialsyntax, const char *eofmark,
-    int striptabs)
-{
-	int c = firstc;
-	char *out;
-	int len;
-	struct nodelist *bqlist;
-	int quotef;
-	int newvarnest;
-	int level;
-	int synentry;
-	struct tokenstate state_static[MAXNEST_static];
-	int maxnest = MAXNEST_static;
-	struct tokenstate *state = state_static;
-	int sqiscstyle = 0;
-
-	startlinno = plinno;
-	quotef = 0;
-	bqlist = NULL;
-	newvarnest = 0;
-	level = 0;
-	state[level].syntax = initialsyntax;
-	state[level].parenlevel = 0;
-	state[level].category = TSTATE_TOP;
-
-	STARTSTACKSTR(out);
-	loop: {	/* for each line, until end of word */
-		if (eofmark && eofmark != NOEOFMARK)
-			/* set c to PEOF if at end of here document */
-			c = checkend(c, eofmark, striptabs);
-		for (;;) {	/* until end of line or end of word */
-			CHECKSTRSPACE(4, out);	/* permit 4 calls to USTPUTC */
-
-			synentry = state[level].syntax[c];
-
-			switch(synentry) {
-			case CNL:	/* '\n' */
-				if (level == 0)
-					goto endword;	/* exit outer loop */
-				/* FALLTHROUGH */
-			case CQNL:
-				USTPUTC(c, out);
-				plinno++;
-				if (doprompt)
-					setprompt(2);
-				else
-					setprompt(0);
-				c = pgetc();
-				goto loop;		/* continue outer loop */
-			case CSBACK:
-				if (sqiscstyle) {
-					out = readcstyleesc(out);
-					break;
-				}
-				/* FALLTHROUGH */
-			case CWORD:
-				USTPUTC(c, out);
-				break;
-			case CCTL:
-				if (eofmark == NULL || initialsyntax != SQSYNTAX)
-					USTPUTC(CTLESC, out);
-				USTPUTC(c, out);
-				break;
-			case CBACK:	/* backslash */
-				c = pgetc();
-				if (c == PEOF) {
-					USTPUTC('\\', out);
-					pungetc();
-				} else if (c == '\n') {
-					plinno++;
-					if (doprompt)
-						setprompt(2);
-					else
-						setprompt(0);
-				} else {
-					if (state[level].syntax == DQSYNTAX &&
-					    c != '\\' && c != '`' && c != '$' &&
-					    (c != '"' || (eofmark != NULL &&
-						newvarnest == 0)) &&
-					    (c != '}' || state[level].category != TSTATE_VAR_OLD))
-						USTPUTC('\\', out);
-					if ((eofmark == NULL ||
-					    newvarnest > 0) &&
-					    state[level].syntax == BASESYNTAX)
-						USTPUTC(CTLQUOTEMARK, out);
-					if (SQSYNTAX[c] == CCTL)
-						USTPUTC(CTLESC, out);
-					USTPUTC(c, out);
-					if ((eofmark == NULL ||
-					    newvarnest > 0) &&
-					    state[level].syntax == BASESYNTAX &&
-					    state[level].category == TSTATE_VAR_OLD)
-						USTPUTC(CTLQUOTEEND, out);
-					quotef++;
-				}
-				break;
-			case CSQUOTE:
-				USTPUTC(CTLQUOTEMARK, out);
-				state[level].syntax = SQSYNTAX;
-				sqiscstyle = 0;
-				break;
-			case CDQUOTE:
-				USTPUTC(CTLQUOTEMARK, out);
-				state[level].syntax = DQSYNTAX;
-				break;
-			case CENDQUOTE:
-				if (eofmark != NULL && newvarnest == 0)
-					USTPUTC(c, out);
-				else {
-					if (state[level].category == TSTATE_VAR_OLD)
-						USTPUTC(CTLQUOTEEND, out);
-					state[level].syntax = BASESYNTAX;
-					quotef++;
-				}
-				break;
-			case CVAR:	/* '$' */
-				PARSESUB();		/* parse substitution */
-				break;
-			case CENDVAR:	/* '}' */
-				if (level > 0 &&
-				    ((state[level].category == TSTATE_VAR_OLD &&
-				      state[level].syntax ==
-				      state[level - 1].syntax) ||
-				    (state[level].category == TSTATE_VAR_NEW &&
-				     state[level].syntax == BASESYNTAX))) {
-					if (state[level].category == TSTATE_VAR_NEW)
-						newvarnest--;
-					level--;
-					USTPUTC(CTLENDVAR, out);
-				} else {
-					USTPUTC(c, out);
-				}
-				break;
-			case CLP:	/* '(' in arithmetic */
-				state[level].parenlevel++;
-				USTPUTC(c, out);
-				break;
-			case CRP:	/* ')' in arithmetic */
-				if (state[level].parenlevel > 0) {
-					USTPUTC(c, out);
-					--state[level].parenlevel;
-				} else {
-					if (pgetc_linecont() == ')') {
-						if (level > 0 &&
-						    state[level].category == TSTATE_ARITH) {
-							level--;
-							USTPUTC(CTLENDARI, out);
-						} else
-							USTPUTC(')', out);
-					} else {
-						/*
-						 * unbalanced parens
-						 *  (don't 2nd guess - no error)
-						 */
-						pungetc();
-						USTPUTC(')', out);
-					}
-				}
-				break;
-			case CBQUOTE:	/* '`' */
-				out = parsebackq(out, &bqlist, 1,
-				    state[level].syntax == DQSYNTAX &&
-				    (eofmark == NULL || newvarnest > 0),
-				    state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX);
-				break;
-			case CEOF:
-				goto endword;		/* exit outer loop */
-			case CIGN:
-				break;
-			default:
-				if (level == 0)
-					goto endword;	/* exit outer loop */
-				USTPUTC(c, out);
-			}
-			c = pgetc_macro();
-		}
-	}
-endword:
-	if (state[level].syntax == ARISYNTAX)
-		synerror("Missing '))'");
-	if (state[level].syntax != BASESYNTAX && eofmark == NULL)
-		synerror("Unterminated quoted string");
-	if (state[level].category == TSTATE_VAR_OLD ||
-	    state[level].category == TSTATE_VAR_NEW) {
-		startlinno = plinno;
-		synerror("Missing '}'");
-	}
-	if (state != state_static)
-		parser_temp_free_upto(state);
-	USTPUTC('\0', out);
-	len = out - stackblock();
-	out = stackblock();
-	if (eofmark == NULL) {
-		if ((c == '>' || c == '<')
-		 && quotef == 0
-		 && len <= 2
-		 && (*out == '\0' || is_digit(*out))) {
-			parseredir(out, c);
-			return lasttoken = TREDIR;
-		} else {
-			pungetc();
-		}
-	}
-	quoteflag = quotef;
-	backquotelist = bqlist;
-	grabstackblock(len);
-	wordtext = out;
-	return lasttoken = TWORD;
-/* end of readtoken routine */
-
-
-/*
- * Parse a substitution.  At this point, we have read the dollar sign
- * and nothing else.
- */
-
-parsesub: {
-	int subtype;
-	int typeloc;
-	int flags;
-	char *p;
-	static const char types[] = "}-+?=";
-	int linno;
-	int length;
-	int c1;
-
-	c = pgetc_linecont();
-	if (c == '(') {	/* $(command) or $((arith)) */
-		if (pgetc_linecont() == '(') {
-			PARSEARITH();
-		} else {
-			pungetc();
-			out = parsebackq(out, &bqlist, 0,
-			    state[level].syntax == DQSYNTAX &&
-			    (eofmark == NULL || newvarnest > 0),
-			    state[level].syntax == DQSYNTAX ||
-			    state[level].syntax == ARISYNTAX);
-		}
-	} else if (c == '{' || is_name(c) || is_special(c)) {
-		USTPUTC(CTLVAR, out);
-		typeloc = out - stackblock();
-		USTPUTC(VSNORMAL, out);
-		subtype = VSNORMAL;
-		flags = 0;
-		if (c == '{') {
-			c = pgetc_linecont();
-			subtype = 0;
-		}
-varname:
-		if (!is_eof(c) && is_name(c)) {
-			length = 0;
-			do {
-				STPUTC(c, out);
-				c = pgetc_linecont();
-				length++;
-			} while (!is_eof(c) && is_in_name(c));
-			if (length == 6 &&
-			    strncmp(out - length, "LINENO", length) == 0) {
-				/* Replace the variable name with the
-				 * current line number. */
-				STADJUST(-6, out);
-				CHECKSTRSPACE(11, out);
-				linno = plinno;
-				if (funclinno != 0)
-					linno -= funclinno - 1;
-				length = snprintf(out, 11, "%d", linno);
-				if (length > 10)
-					length = 10;
-				out += length;
-				flags |= VSLINENO;
-			}
-		} else if (is_digit(c)) {
-			if (subtype != VSNORMAL) {
-				do {
-					STPUTC(c, out);
-					c = pgetc_linecont();
-				} while (is_digit(c));
-			} else {
-				USTPUTC(c, out);
-				c = pgetc_linecont();
-			}
-		} else if (is_special(c)) {
-			c1 = c;
-			c = pgetc_linecont();
-			if (subtype == 0 && c1 == '#') {
-				subtype = VSLENGTH;
-				if (strchr(types, c) == NULL && c != ':' &&
-				    c != '#' && c != '%')
-					goto varname;
-				c1 = c;
-				c = pgetc_linecont();
-				if (c1 != '}' && c == '}') {
-					pungetc();
-					c = c1;
-					goto varname;
-				}
-				pungetc();
-				c = c1;
-				c1 = '#';
-				subtype = 0;
-			}
-			USTPUTC(c1, out);
-		} else {
-			subtype = VSERROR;
-			if (c == '}')
-				pungetc();
-			else if (c == '\n' || c == PEOF)
-				synerror("Unexpected end of line in substitution");
-			else if (BASESYNTAX[c] != CCTL)
-				USTPUTC(c, out);
-		}
-		if (subtype == 0) {
-			switch (c) {
-			case ':':
-				flags |= VSNUL;
-				c = pgetc_linecont();
-				/*FALLTHROUGH*/
-			default:
-				p = strchr(types, c);
-				if (p == NULL) {
-					if (c == '\n' || c == PEOF)
-						synerror("Unexpected end of line in substitution");
-					if (flags == VSNUL)
-						STPUTC(':', out);
-					if (BASESYNTAX[c] != CCTL)
-						STPUTC(c, out);
-					subtype = VSERROR;
-				} else
-					subtype = p - types + VSNORMAL;
-				break;
-			case '%':
-			case '#':
-				{
-					int cc = c;
-					subtype = c == '#' ? VSTRIMLEFT :
-							     VSTRIMRIGHT;
-					c = pgetc_linecont();
-					if (c == cc)
-						subtype++;
-					else
-						pungetc();
-					break;
-				}
-			}
-		} else if (subtype != VSERROR) {
-			if (subtype == VSLENGTH && c != '}')
-				subtype = VSERROR;
-			pungetc();
-		}
-		STPUTC('=', out);
-		if (state[level].syntax == DQSYNTAX ||
-		    state[level].syntax == ARISYNTAX)
-			flags |= VSQUOTE;
-		*(stackblock() + typeloc) = subtype | flags;
-		if (subtype != VSNORMAL) {
-			if (level + 1 >= maxnest) {
-				maxnest *= 2;
-				if (state == state_static) {
-					state = parser_temp_alloc(
-					    maxnest * sizeof(*state));
-					memcpy(state, state_static,
-					    MAXNEST_static * sizeof(*state));
-				} else
-					state = parser_temp_realloc(state,
-					    maxnest * sizeof(*state));
-			}
-			level++;
-			state[level].parenlevel = 0;
-			if (subtype == VSMINUS || subtype == VSPLUS ||
-			    subtype == VSQUESTION || subtype == VSASSIGN) {
-				/*
-				 * For operators that were in the Bourne shell,
-				 * inherit the double-quote state.
-				 */
-				state[level].syntax = state[level - 1].syntax;
-				state[level].category = TSTATE_VAR_OLD;
-			} else {
-				/*
-				 * The other operators take a pattern,
-				 * so go to BASESYNTAX.
-				 * Also, ' and " are now special, even
-				 * in here documents.
-				 */
-				state[level].syntax = BASESYNTAX;
-				state[level].category = TSTATE_VAR_NEW;
-				newvarnest++;
-			}
-		}
-	} else if (c == '\'' && state[level].syntax == BASESYNTAX) {
-		/* $'cstylequotes' */
-		USTPUTC(CTLQUOTEMARK, out);
-		state[level].syntax = SQSYNTAX;
-		sqiscstyle = 1;
-	} else {
-		USTPUTC('$', out);
-		pungetc();
-	}
-	goto parsesub_return;
-}
-
-
-/*
- * Parse an arithmetic expansion (indicate start of one and set state)
- */
-parsearith: {
-
-	if (level + 1 >= maxnest) {
-		maxnest *= 2;
-		if (state == state_static) {
-			state = parser_temp_alloc(
-			    maxnest * sizeof(*state));
-			memcpy(state, state_static,
-			    MAXNEST_static * sizeof(*state));
-		} else
-			state = parser_temp_realloc(state,
-			    maxnest * sizeof(*state));
-	}
-	level++;
-	state[level].syntax = ARISYNTAX;
-	state[level].parenlevel = 0;
-	state[level].category = TSTATE_ARITH;
-	USTPUTC(CTLARI, out);
-	if (state[level - 1].syntax == DQSYNTAX)
-		USTPUTC('"',out);
-	else
-		USTPUTC(' ',out);
-	goto parsearith_return;
-}
-
-} /* end of readtoken */
-
-
-/*
- * Returns true if the text contains nothing to expand (no dollar signs
- * or backquotes).
- */
-
-static int
-noexpand(char *text)
-{
-	char *p;
-	char c;
-
-	p = text;
-	while ((c = *p++) != '\0') {
-		if ( c == CTLQUOTEMARK)
-			continue;
-		if (c == CTLESC)
-			p++;
-		else if (BASESYNTAX[(int)c] == CCTL)
-			return 0;
-	}
-	return 1;
-}
-
-
-/*
- * Return true if the argument is a legal variable name (a letter or
- * underscore followed by zero or more letters, underscores, and digits).
- */
-
-int
-goodname(const char *name)
-{
-	const char *p;
-
-	p = name;
-	if (! is_name(*p))
-		return 0;
-	while (*++p) {
-		if (! is_in_name(*p))
-			return 0;
-	}
-	return 1;
-}
-
-
-int
-isassignment(const char *p)
-{
-	if (!is_name(*p))
-		return 0;
-	p++;
-	for (;;) {
-		if (*p == '=')
-			return 1;
-		else if (!is_in_name(*p))
-			return 0;
-		p++;
-	}
-}
-
-
-static void
-consumetoken(int token)
-{
-	if (readtoken() != token)
-		synexpect(token);
-}
-
-
-/*
- * Called when an unexpected token is read during the parse.  The argument
- * is the token that is expected, or -1 if more than one type of token can
- * occur at this point.
- */
-
-static void
-synexpect(int token)
-{
-	char msg[64];
-
-	if (token >= 0) {
-		fmtstr(msg, 64, "%s unexpected (expecting %s)",
-			tokname[lasttoken], tokname[token]);
-	} else {
-		fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
-	}
-	synerror(msg);
-}
-
-
-static void
-synerror(const char *msg)
-{
-	if (commandname)
-		outfmt(out2, "%s: %d: ", commandname, startlinno);
-	else if (arg0)
-		outfmt(out2, "%s: ", arg0);
-	outfmt(out2, "Syntax error: %s\n", msg);
-	error((char *)NULL);
-}
-
-static void
-setprompt(int which)
-{
-	whichprompt = which;
-	if (which == 0)
-		return;
-
-	if (which == 1 && *ps0val()) {
-		out2str(expandprompt(ps0val()));
-		flushout(out2);
-	}
-
-#ifndef NO_HISTORY
-	if (!el)
-#endif
-	{
-		out2str(getprompt(NULL));
-		flushout(out2);
-	}
-}
-
-static int
-pgetc_linecont(void)
-{
-	int c;
-
-	while ((c = pgetc_macro()) == '\\') {
-		c = pgetc();
-		if (c == '\n') {
-			plinno++;
-			if (doprompt)
-				setprompt(2);
-			else
-				setprompt(0);
-		} else {
-			pungetc();
-			/* Allow the backslash to be pushed back. */
-			pushstring("\\", 1, NULL);
-			return (pgetc());
-		}
-	}
-	return (c);
-}
-
-static char *
-expandprompt(const char *fmt) {
-	static char ps[PROMPTLEN];
-	const char *pwd, *home;
-	int i, trim;
-
-	/*
-	 * Format prompt string.
-	 */
-	for (i = 0; (i < PROMPTLEN - 1) && (*fmt != '\0'); i++, fmt++)
-		if (*fmt == '\\')
-			switch (*++fmt) {
-
-				/*
-				 * Hostname.
-				 *
-				 * \h specifies just the local hostname,
-				 * \H specifies fully-qualified hostname.
-				 */
-			case 'h':
-			case 'H':
-				ps[i] = '\0';
-				gethostname(&ps[i], PROMPTLEN - i - 1);
-				ps[PROMPTLEN - 1] = '\0';
-				/* Skip to end of hostname. */
-				trim = (*fmt == 'h') ? '.' : '\0';
-				while ((ps[i] != '\0') && (ps[i] != trim))
-					i++;
-				--i;
-				break;
-
-				/*
-				 * Working directory.
-				 *
-				 * \W specifies just the final component,
-				 * \w specifies the entire path.
-				 */
-			case 'W':
-			case 'w':
-				pwd = lookupvar("PWD");
-				home = lookupvar("HOME");
-				if (pwd == NULL || *pwd == '\0')
-					pwd = "?";
-				if (home == NULL || *home == '\0')
-					home = "?";
-				if (*fmt == 'W' &&
-				    *pwd == '/' && pwd[1] != '\0' &&
-					strcmp(pwd, home) != 0) {
-					strlcpy(&ps[i], strrchr(pwd, '/') + 1,
-					    PROMPTLEN - i);
-				} else {
-					if (strncmp(pwd, home, strlen(home)) == 0) {
-						ps[i++] = '~';
-						pwd += strlen(home);
-					}
-					strlcpy(&ps[i], pwd, PROMPTLEN - i);
-				}
-				/* Skip to end of path. */
-				while (ps[i] != '\0')
-					i++;
-				--i;
-				break;
-
-				/*
-				 * Superuser status.
-				 *
-				 * '$' for normal users, '#' for root.
-				 */
-			case '$':
-				ps[i] = (geteuid() != 0) ? '$' : '#';
-				break;
-
-				/*
-				 * A literal \.
-				 */
-			case '\\':
-				ps[i] = '\\';
-				break;
-
-				/*
-				 * Emit unrecognized formats verbatim.
-				 */
-			default:
-				ps[i] = '\\';
-				if (i < PROMPTLEN - 2)
-					ps[++i] = *fmt;
-				break;
-			}
-		else
-			ps[i] = *fmt;
-	ps[i] = '\0';
-	return (ps);
-}
-
-/*
- * called by editline -- any expansions to the prompt
- *    should be added here.
- */
-char *
-getprompt(void *unused __unused)
-{
-	const char *fmt;
-	static char internal_error[] = "??";
-
-	/*
-	 * Select prompt format.
-	 */
-	switch (whichprompt) {
-	case 0:
-		fmt = "";
-		break;
-	case 1:
-		fmt = ps1val();
-		break;
-	case 2:
-		fmt = ps2val();
-		break;
-	default:
-		return internal_error;
-	}
-
-	return expandprompt(fmt);
-}
-
-char *
-getrprompt(void *unused __unused)
-{
-	const char *fmt;
-	static char internal_error[] = "??";
-
-	/*
-	 * Select prompt format.
-	 */
-	switch (whichprompt) {
-	case 0:
-		fmt = "";
-		break;
-	case 1:
-		fmt = rps1val();
-		break;
-	case 2:
-		fmt = rps2val();
-		break;
-	default:
-		return internal_error;
-	}
-
-	return expandprompt(fmt);
-}
-
-
-const char *
-expandstr(const char *ps)
-{
-	union node n;
-	struct jmploc jmploc;
-	struct jmploc *const savehandler = handler;
-	const int saveprompt = doprompt;
-	struct parsefile *const savetopfile = getcurrentfile();
-	struct parser_temp *const saveparser_temp = parser_temp;
-	const char *result = NULL;
-
-	if (!setjmp(jmploc.loc)) {
-		handler = &jmploc;
-		parser_temp = NULL;
-		setinputstring(ps, 1);
-		doprompt = 0;
-		readtoken1(pgetc(), DQSYNTAX, NOEOFMARK, 0);
-		if (backquotelist != NULL)
-			error("Command substitution not allowed here");
-
-		n.narg.type = NARG;
-		n.narg.next = NULL;
-		n.narg.text = wordtext;
-		n.narg.backquote = backquotelist;
-
-		expandarg(&n, NULL, 0);
-		result = stackblock();
-		INTOFF;
-	}
-	handler = savehandler;
-	doprompt = saveprompt;
-	popfilesupto(savetopfile);
-	if (parser_temp != saveparser_temp) {
-		parser_temp_free_all();
-		parser_temp = saveparser_temp;
-	}
-	if (result != NULL) {
-		INTON;
-	} else if (exception == EXINT)
-		raise(SIGINT);
-	return result;
-}