1/*-
 2 * SPDX-License-Identifier: BSD-3-Clause
 3 *
 4 * Copyright (c) 1991, 1993
 5 *	The Regents of the University of California.  All rights reserved.
 6 *
 7 * This code is derived from software contributed to Berkeley by
 8 * Kenneth Almquist.
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35extern char *commandname;	/* currently executing command */
36extern int exitstatus;		/* exit status of last command */
37extern int oexitstatus;		/* saved exit status */
38extern struct arglist *cmdenviron;  /* environment for builtin command */
39
40
41struct backcmd {		/* result of evalbackcmd */
42	int fd;			/* file descriptor to read from */
43	char *buf;		/* buffer */
44	int nleft;		/* number of chars in buffer */
45	struct job *jp;		/* job structure for command */
46};
47
48void reseteval(void);
49
50/* flags in argument to evaltree/evalstring */
51#define EV_EXIT 01		/* exit after evaluating tree */
52#define EV_TESTED 02		/* exit status is checked; ignore -e flag */
53#define EV_BACKCMD 04		/* command executing within back quotes */
54
55void evalstring(const char *, int);
56union node;	/* BLETCH for ansi C */
57void evaltree(union node *, int);
58void evalbackcmd(union node *, struct backcmd *);
59
60/* in_function returns nonzero if we are currently evaluating a function */
61#define in_function()	funcnest
62extern int funcnest;
63extern int evalskip;
64extern int skipcount;
65
66/* reasons for skipping commands (see comment on breakcmd routine) */
67#define SKIPBREAK	1
68#define SKIPCONT	2
69#define SKIPRETURN	3