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