1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 35 extern char *commandname; /* currently executing command */ 36 extern int exitstatus; /* exit status of last command */ 37 extern int oexitstatus; /* saved exit status */ 38 extern struct arglist *cmdenviron; /* environment for builtin command */ 39 40 41 struct backcmd { /* result of evalbackcmd */ 42 int fd; /* file descriptor to read from */ 43 char *buf; /* buffer */ 44 int nleft; /* number of chars in buffer */ 45 struct job *jp; /* job structure for command */ 46 }; 47 48 void reseteval(void); 49 50 /* flags in argument to evaltree/evalstring */ 51 #define EV_EXIT 01 /* exit after evaluating tree */ 52 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */ 53 #define EV_BACKCMD 04 /* command executing within back quotes */ 54 55 void evalstring(const char *, int); 56 union node; /* BLETCH for ansi C */ 57 void evaltree(union node *, int); 58 void evalbackcmd(union node *, struct backcmd *); 59 60 /* in_function returns nonzero if we are currently evaluating a function */ 61 #define in_function() funcnest 62 extern int funcnest; 63 extern int evalskip; 64 extern int skipcount; 65 66 /* reasons for skipping commands (see comment on breakcmd routine) */ 67 #define SKIPBREAK 1 68 #define SKIPCONT 2 69 #define SKIPRETURN 3 70