bin/sh/eval.h

   1 /*      $NetBSD: eval.h,v 1.16 2014/05/31 14:42:18 christos 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 /* in_function returns nonzero if we are currently evaluating a function */
  56 int in_function(void);          /* return non-zero, if evaluating a function */
  57
  58 /* reasons for skipping commands (see comment on breakcmd routine) */
  59 enum skipstate {
  60       SKIPNONE  = 0,    /* not skipping */
  61       SKIPBREAK,        /* break */
  62       SKIPCONT,         /* continue */
  63       SKIPFUNC,         /* return in a function */
  64       SKIPFILE          /* return in a dot command */
  65 };
  66
  67 enum skipstate current_skipstate(void);
  68 void stop_skipping(void);       /* reset internal skipping state to SKIPNONE */
  69
  70 /*
  71  * Only for use by reset() in init.c!
  72  */
  73 void reset_eval(void);