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eval.h revision 1.23 
      1 /*	$NetBSD: eval.h,v 1.23 2019/02/04 11:16:41 kre Exp $	*/
      2 
      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  *	@(#)eval.h	8.2 (Berkeley) 5/4/95
     35  */
     36 
     37 extern const char *commandname;	/* currently executing command */
     38 extern int exitstatus;		/* exit status of last command */
     39 extern int back_exitstatus;	/* exit status of backquoted command */
     40 extern struct strlist *cmdenviron;  /* environment for builtin command */
     41 
     42 
     43 struct backcmd {		/* result of evalbackcmd */
     44 	int fd;			/* file descriptor to read from */
     45 	char *buf;		/* buffer */
     46 	int nleft;		/* number of chars in buffer */
     47 	struct job *jp;		/* job structure for command */
     48 };
     49 
     50 void evalstring(char *, int);
     51 union node;	/* BLETCH for ansi C */
     52 void evaltree(union node *, int);
     53 void evalbackcmd(union node *, struct backcmd *);
     54 
     55 const char *syspath(void);
     56 
     57 /* in_function returns nonzero if we are currently evaluating a function */
     58 int in_function(void);		/* return non-zero, if evaluating a function */
     59 
     60 /* reasons for skipping commands (see comment on breakcmd routine) */
     61 enum skipstate {
     62       SKIPNONE  = 0,	/* not skipping */
     63       SKIPBREAK,	/* break */
     64       SKIPCONT,		/* continue */
     65       SKIPFUNC,		/* return in a function */
     66       SKIPFILE		/* return in a dot command */
     67 };
     68 
     69 struct skipsave {
     70 	enum skipstate state;	/* skipping or not */
     71 	int count;		/* when break or continue, how many */
     72 };
     73 
     74 enum skipstate current_skipstate(void);
     75 void save_skipstate(struct skipsave *);
     76 void restore_skipstate(const struct skipsave *);
     77 void stop_skipping(void);	/* reset internal skipping state to SKIPNONE */
     78 int set_dot_funcnest(int);
     79 
     80 /*
     81  * Only for use by reset() in init.c!
     82  */
     83 void reset_eval(void);
     84 
     85 /* flags in argument to evaltree */
     86 #define EV_EXIT		0x01	/* exit after evaluating tree */
     87 #define EV_TESTED	0x02	/* exit status is checked; ignore -e flag */
     88 #define EV_BACKCMD	0x04	/* command executing within back quotes */
     89