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 * 4. 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 *	@(#)eval.h	8.2 (Berkeley) 5/4/95
33 * $FreeBSD$
34 */
35
36extern char *commandname;	/* currently executing command */
37extern int exitstatus;		/* exit status of last command */
38extern int oexitstatus;		/* saved exit status */
39extern struct strlist *cmdenviron;  /* environment for builtin command */
40
41
42struct backcmd {		/* result of evalbackcmd */
43	int fd;			/* file descriptor to read from */
44	char *buf;		/* buffer */
45	int nleft;		/* number of chars in buffer */
46	struct job *jp;		/* job structure for command */
47};
48
49void reseteval(void);
50
51/* flags in argument to evaltree/evalstring */
52#define EV_EXIT 01		/* exit after evaluating tree */
53#define EV_TESTED 02		/* exit status is checked; ignore -e flag */
54#define EV_BACKCMD 04		/* command executing within back quotes */
55
56void evalstring(char *, int);
57union node;	/* BLETCH for ansi C */
58void evaltree(union node *, int);
59void evalbackcmd(union node *, struct backcmd *);
60
61/* in_function returns nonzero if we are currently evaluating a function */
62#define in_function()	funcnest
63extern int funcnest;
64extern int evalskip;
65extern int skipcount;
66
67/* reasons for skipping commands (see comment on breakcmd routine) */
68#define SKIPBREAK	1
69#define SKIPCONT	2
70#define SKIPRETURN	3
71