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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/bin/sh/eval.h
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/*-

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 * Copyright (c) 1991, 1993

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 *	The Regents of the University of California.  All rights reserved.

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 *

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 * This code is derived from software contributed to Berkeley by

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 * Kenneth Almquist.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 * 3. Neither the name of the University nor the names of its contributors

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 *    may be used to endorse or promote products derived from this software

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 *    without specific prior written permission.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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extern char *commandname;	/* currently executing command */

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extern int exitstatus;		/* exit status of last command */

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extern int oexitstatus;		/* saved exit status */

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extern struct arglist *cmdenviron;  /* environment for builtin command */

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struct backcmd {		/* result of evalbackcmd */

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	int fd;			/* file descriptor to read from */

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	char *buf;		/* buffer */

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	int nleft;		/* number of chars in buffer */

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	struct job *jp;		/* job structure for command */

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};

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void reseteval(void);

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/* flags in argument to evaltree/evalstring */

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#define EV_EXIT 01		/* exit after evaluating tree */

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#define EV_TESTED 02		/* exit status is checked; ignore -e flag */

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#define EV_BACKCMD 04		/* command executing within back quotes */

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void evalstring(const char *, int);

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union node;	/* BLETCH for ansi C */

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void evaltree(union node *, int);

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void evalbackcmd(union node *, struct backcmd *);

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/* in_function returns nonzero if we are currently evaluating a function */

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#define in_function()	funcnest

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extern int funcnest;

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extern int evalskip;

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extern int skipcount;

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/* reasons for skipping commands (see comment on breakcmd routine) */

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#define SKIPBREAK	1

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#define SKIPCONT	2

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#define SKIPRETURN	3

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