bin/sh/eval.h

   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  *      @(#)eval.h      8.2 (Berkeley) 5/4/95
  33  * $FreeBSD$
  34  */
  35
  36 extern char *commandname;       /* currently executing command */
  37 extern int exitstatus;          /* exit status of last command */
  38 extern int oexitstatus;         /* saved exit status */
  39 extern struct strlist *cmdenviron;  /* environment for builtin command */
  40
  41
  42 struct 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
  49 void 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
  56 void evalstring(const char *, int);
  57 union node;     /* BLETCH for ansi C */
  58 void evaltree(union node *, int);
  59 void evalbackcmd(union node *, struct backcmd *);
  60
  61 /* in_function returns nonzero if we are currently evaluating a function */
  62 #define in_function()   funcnest
  63 extern int funcnest;
  64 extern int evalskip;
  65 extern 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