xref: /freebsd-9.3-release/bin/sh/parser.h

/*-
 * 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.
 * 4. 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.
 *
 *	@(#)parser.h	8.3 (Berkeley) 5/4/95
 * $FreeBSD$
 */

/* control characters in argument strings */
#define CTLESC '\300'
#define CTLVAR '\301'
#define CTLENDVAR '\371'
#define CTLBACKQ '\372'
#define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
/*	CTLBACKQ | CTLQUOTE == '\373' */
#define	CTLARI	'\374'
#define	CTLENDARI '\375'
#define	CTLQUOTEMARK '\376'
#define	CTLQUOTEEND '\377' /* only for ${v+-...} */

/* variable substitution byte (follows CTLVAR) */
#define VSTYPE		0x0f	/* type of variable substitution */
#define VSNUL		0x10	/* colon--treat the empty string as unset */
#define VSLINENO	0x20	/* expansion of $LINENO, the line number \
				   follows immediately */
#define VSQUOTE		0x80	/* inside double quotes--suppress splitting */

/* values of VSTYPE field */
#define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
#define VSMINUS		0x2		/* ${var-text} */
#define VSPLUS		0x3		/* ${var+text} */
#define VSQUESTION	0x4		/* ${var?message} */
#define VSASSIGN	0x5		/* ${var=text} */
#define VSTRIMLEFT	0x6		/* ${var#pattern} */
#define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
#define VSTRIMRIGHT	0x8		/* ${var%pattern} */
#define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
#define VSLENGTH	0xa		/* ${#var} */
#define VSERROR		0xb		/* Syntax error, issue when expanded */


/*
 * NEOF is returned by parsecmd when it encounters an end of file.  It
 * must be distinct from NULL, so we use the address of a variable that
 * happens to be handy.
 */
extern int tokpushback;
#define NEOF ((union node *)&tokpushback)
extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
extern const char *const parsekwd[];


union node *parsecmd(int);
void fixredir(union node *, const char *, int);
int goodname(const char *);
int isassignment(const char *);
char *getprompt(void *);
const char *expandstr(char *);