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When expanding a here-doc (NXHERE - the type with an unquoted end delim)
the output will not be further processed (at all) so there is no need
to escape magic chars in the output, and doing so leaves stray CTLESC
chars in the here doc text.  Not good.   So don't do that...

To save a strlen() of the result, to determine the size of the here doc,
make rmescapes() return the length of the resulting string (this isn't
needed for other uses, so didn't happen previously).

Reported on current-users@ (2020-02-06) by Jun Ebihara

XXX pullup -9

/*	$NetBSD: expand.h,v 1.25 2020/02/13 05:19:05 kre Exp $	*/

/*-
 * 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.
 *
 *	@(#)expand.h	8.2 (Berkeley) 5/4/95
 */

#include <inttypes.h>

struct strlist {
	struct strlist *next;
	char *text;
};


struct arglist {
	struct strlist *list;
	struct strlist **lastp;
};

/*
 * expandarg() flags
 */
#define EXP_SPLIT	0x1	/* perform word splitting */
#define EXP_TILDE	0x2	/* do normal tilde expansion */
#define EXP_VARTILDE	0x4	/* expand tildes in an assignment */
#define EXP_REDIR	0x8	/* file glob for a redirection (1 match only) */
#define EXP_CASE	0x10	/* keeps quotes around for CASE pattern */
#define EXP_IFS_SPLIT	0x20	/* need to record arguments for ifs breakup */
#define EXP_IN_QUOTES	0x40	/* don't set EXP_IFS_SPLIT again */
#define EXP_GLOB	0x80	/* perform filename globbing */
#define EXP_NL		0x100	/* keep CRTNONL in output */

#define EXP_FULL	(EXP_SPLIT | EXP_GLOB)
#define EXP_QNEEDED	(EXP_GLOB | EXP_CASE | EXP_REDIR)

union node;

void expandhere(union node *, int);
void expandarg(union node *, struct arglist *, int);
int rmescapes(char *);
int casematch(union node *, char *);