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