4084f829ec
Suppress shell error messages while expanding $ENV (which also causes errors while expanding $PS1 $PS2 and $PS4 to be suppressed as well). This allows any random garbage that happens to be in ENV to not cause noise when the shell starts (which is effectively all it did). On a parse error (for any of those vars) we also use "" as the result, which will be a null prompt, and avoid attempting to open any file for ENV. This does not in any way change what happens for a correctly parsed command substitution (either when it is executed when permitted for one of the prompts, or when it is not (which is always for ENV)) and commands run from those can still produce error output (but shell errors remain suppressed).
89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/* $NetBSD: eval.h,v 1.23 2019/02/04 11:16:41 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)eval.h 8.2 (Berkeley) 5/4/95
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*/
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extern const char *commandname; /* currently executing command */
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extern int exitstatus; /* exit status of last command */
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extern int back_exitstatus; /* exit status of backquoted command */
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extern struct strlist *cmdenviron; /* environment for builtin command */
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struct backcmd { /* result of evalbackcmd */
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int fd; /* file descriptor to read from */
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char *buf; /* buffer */
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int nleft; /* number of chars in buffer */
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struct job *jp; /* job structure for command */
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};
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void evalstring(char *, int);
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union node; /* BLETCH for ansi C */
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void evaltree(union node *, int);
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void evalbackcmd(union node *, struct backcmd *);
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const char *syspath(void);
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/* in_function returns nonzero if we are currently evaluating a function */
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int in_function(void); /* return non-zero, if evaluating a function */
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/* reasons for skipping commands (see comment on breakcmd routine) */
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enum skipstate {
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SKIPNONE = 0, /* not skipping */
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SKIPBREAK, /* break */
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SKIPCONT, /* continue */
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SKIPFUNC, /* return in a function */
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SKIPFILE /* return in a dot command */
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};
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struct skipsave {
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enum skipstate state; /* skipping or not */
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int count; /* when break or continue, how many */
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};
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enum skipstate current_skipstate(void);
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void save_skipstate(struct skipsave *);
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void restore_skipstate(const struct skipsave *);
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void stop_skipping(void); /* reset internal skipping state to SKIPNONE */
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int set_dot_funcnest(int);
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/*
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* Only for use by reset() in init.c!
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*/
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void reset_eval(void);
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/* flags in argument to evaltree */
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#define EV_EXIT 0x01 /* exit after evaluating tree */
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#define EV_TESTED 0x02 /* exit status is checked; ignore -e flag */
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#define EV_BACKCMD 0x04 /* command executing within back quotes */
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