85170a4a2a
demanded by POSIX. - A redirection error is only fatal (meaning the execution of a shell script is terminated) for special built-ins. Previously it was fatal for all shell builtins, causing problems like the one reported in PR 88845. - Variable assignments remain in effect for special built-ins. - Option or operand errors are only fatal for special built-ins. This change also makes errors from 'fc' non-fatal (I could not find any reasons for this behaviour). Somewhat independently from the above down-grade the error handling in the shift built-in if the operand is bigger than $# from an error() call (which is now fatal) to a return 1. I'm not sure if this should be considered a POSIX "operand error", however this change is needed for now as we trigger that error while building libncurses. Comparing with other shells, zsh does the same as our sh before this change (write a diagnostic, return 1), bash behaves as our sh after this commit (no diagnostic, return 1) and ksh93 and NetBSD's sh treat it as a fatal error.
586 lines
12 KiB
C
586 lines
12 KiB
C
/*-
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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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* 4. 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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "shell.h"
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#define DEFINE_OPTIONS
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#include "options.h"
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#undef DEFINE_OPTIONS
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#include "nodes.h" /* for other header files */
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#include "eval.h"
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#include "jobs.h"
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#include "input.h"
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#include "output.h"
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#include "trap.h"
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#include "var.h"
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#include "memalloc.h"
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#include "error.h"
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#include "mystring.h"
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#ifndef NO_HISTORY
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#include "myhistedit.h"
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#endif
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char *arg0; /* value of $0 */
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struct shparam shellparam; /* current positional parameters */
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char **argptr; /* argument list for builtin commands */
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char *shoptarg; /* set by nextopt (like getopt) */
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char *optptr; /* used by nextopt */
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char *minusc; /* argument to -c option */
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STATIC void options(int);
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STATIC void minus_o(char *, int);
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STATIC void setoption(int, int);
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STATIC int getopts(char *, char *, char **, char ***, char **);
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/*
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* Process the shell command line arguments.
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*/
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void
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procargs(int argc, char **argv)
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{
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int i;
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argptr = argv;
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if (argc > 0)
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argptr++;
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for (i = 0; i < NOPTS; i++)
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optlist[i].val = 2;
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privileged = (getuid() != geteuid() || getgid() != getegid());
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options(1);
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if (*argptr == NULL && minusc == NULL)
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sflag = 1;
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if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
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iflag = 1;
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if (mflag == 2)
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mflag = iflag;
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for (i = 0; i < NOPTS; i++)
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if (optlist[i].val == 2)
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optlist[i].val = 0;
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arg0 = argv[0];
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if (sflag == 0 && minusc == NULL) {
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commandname = arg0 = *argptr++;
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setinputfile(commandname, 0);
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}
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/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
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if (argptr && minusc && *argptr)
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arg0 = *argptr++;
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shellparam.p = argptr;
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shellparam.reset = 1;
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/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
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while (*argptr) {
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shellparam.nparam++;
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argptr++;
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}
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optschanged();
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}
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void
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optschanged(void)
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{
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setinteractive(iflag);
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#ifndef NO_HISTORY
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histedit();
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#endif
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setjobctl(mflag);
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}
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/*
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* Process shell options. The global variable argptr contains a pointer
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* to the argument list; we advance it past the options.
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*/
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STATIC void
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options(int cmdline)
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{
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char *kp, *p;
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int val;
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int c;
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if (cmdline)
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minusc = NULL;
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while ((p = *argptr) != NULL) {
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argptr++;
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if ((c = *p++) == '-') {
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val = 1;
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/* A "-" or "--" terminates options */
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if (p[0] == '\0')
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goto end_options1;
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if (p[0] == '-' && p[1] == '\0')
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goto end_options2;
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/**
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* For the benefit of `#!' lines in shell scripts,
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* treat a string of '-- *#.*' the same as '--'.
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* This is needed so that a script starting with:
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* #!/bin/sh -- # -*- perl -*-
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* will continue to work after a change is made to
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* kern/imgact_shell.c to NOT token-ize the options
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* specified on a '#!' line. A bit of a kludge,
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* but that trick is recommended in documentation
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* for some scripting languages, and we might as
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* well continue to support it.
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*/
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if (p[0] == '-') {
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kp = p + 1;
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while (*kp == ' ' || *kp == '\t')
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kp++;
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if (*kp == '#' || *kp == '\0')
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goto end_options2;
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}
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} else if (c == '+') {
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val = 0;
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} else {
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argptr--;
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break;
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}
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while ((c = *p++) != '\0') {
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if (c == 'c' && cmdline) {
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char *q;
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#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
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if (*p == '\0')
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#endif
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q = *argptr++;
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if (q == NULL || minusc != NULL)
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error("Bad -c option");
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minusc = q;
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#ifdef NOHACK
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break;
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#endif
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} else if (c == 'o') {
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minus_o(*argptr, val);
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if (*argptr)
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argptr++;
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} else {
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if (c == 'p' && !val && privileged) {
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(void) setuid(getuid());
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(void) setgid(getgid());
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}
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setoption(c, val);
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}
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}
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}
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return;
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/* When processing `set', a single "-" means turn off -x and -v */
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end_options1:
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if (!cmdline) {
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xflag = vflag = 0;
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return;
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}
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/*
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* When processing `set', a "--" means the remaining arguments
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* replace the positional parameters in the active shell. If
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* there are no remaining options, then all the positional
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* parameters are cleared (equivalent to doing ``shift $#'').
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*/
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end_options2:
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if (!cmdline) {
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if (*argptr == NULL)
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setparam(argptr);
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return;
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}
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/*
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* At this point we are processing options given to 'sh' on a command
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* line. If an end-of-options marker ("-" or "--") is followed by an
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* arg of "#", then skip over all remaining arguments. Some scripting
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* languages (e.g.: perl) document that /bin/sh will implement this
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* behavior, and they recommend that users take advantage of it to
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* solve certain issues that can come up when writing a perl script.
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* Yes, this feature is in /bin/sh to help users write perl scripts.
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*/
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p = *argptr;
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if (p != NULL && p[0] == '#' && p[1] == '\0') {
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while (*argptr != NULL)
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argptr++;
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/* We need to keep the final argument */
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argptr--;
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}
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}
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STATIC void
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minus_o(char *name, int val)
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{
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int i;
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if (name == NULL) {
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if (val) {
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/* "Pretty" output. */
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out1str("Current option settings\n");
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for (i = 0; i < NOPTS; i++)
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out1fmt("%-16s%s\n", optlist[i].name,
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optlist[i].val ? "on" : "off");
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} else {
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/* Output suitable for re-input to shell. */
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for (i = 0; i < NOPTS; i++) {
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if (i % 6 == 0)
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out1str(i == 0 ? "set" : "\nset");
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out1fmt(" %co %s", optlist[i].val ? '-' : '+',
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optlist[i].name);
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}
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out1c('\n');
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}
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} else {
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for (i = 0; i < NOPTS; i++)
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if (equal(name, optlist[i].name)) {
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if (!val && privileged && equal(name, "privileged")) {
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(void) setuid(getuid());
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(void) setgid(getgid());
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}
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setoption(optlist[i].letter, val);
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return;
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}
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error("Illegal option -o %s", name);
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}
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}
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STATIC void
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setoption(int flag, int val)
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{
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int i;
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for (i = 0; i < NOPTS; i++)
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if (optlist[i].letter == flag) {
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optlist[i].val = val;
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if (val) {
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/* #%$ hack for ksh semantics */
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if (flag == 'V')
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Eflag = 0;
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else if (flag == 'E')
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Vflag = 0;
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}
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return;
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}
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error("Illegal option -%c", flag);
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}
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#ifdef mkinit
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INCLUDE "options.h"
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SHELLPROC {
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int i;
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for (i = 0; i < NOPTS; i++)
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optlist[i].val = 0;
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optschanged();
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}
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#endif
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/*
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* Set the shell parameters.
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*/
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void
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setparam(char **argv)
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{
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char **newparam;
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char **ap;
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int nparam;
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for (nparam = 0 ; argv[nparam] ; nparam++);
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ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
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while (*argv) {
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*ap++ = savestr(*argv++);
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}
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*ap = NULL;
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freeparam(&shellparam);
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shellparam.malloc = 1;
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shellparam.nparam = nparam;
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shellparam.p = newparam;
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shellparam.optnext = NULL;
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}
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/*
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* Free the list of positional parameters.
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*/
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void
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freeparam(struct shparam *param)
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{
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char **ap;
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|
if (param->malloc) {
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for (ap = param->p ; *ap ; ap++)
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ckfree(*ap);
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ckfree(param->p);
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}
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}
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/*
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* The shift builtin command.
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*/
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int
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shiftcmd(int argc, char **argv)
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{
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|
int n;
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|
char **ap1, **ap2;
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n = 1;
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if (argc > 1)
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n = number(argv[1]);
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|
if (n > shellparam.nparam)
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return 1;
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INTOFF;
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shellparam.nparam -= n;
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for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
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if (shellparam.malloc)
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ckfree(*ap1);
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}
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ap2 = shellparam.p;
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while ((*ap2++ = *ap1++) != NULL);
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shellparam.optnext = NULL;
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INTON;
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return 0;
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}
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|
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/*
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|
* The set command builtin.
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*/
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int
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setcmd(int argc, char **argv)
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|
{
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|
if (argc == 1)
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return showvarscmd(argc, argv);
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INTOFF;
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options(0);
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|
optschanged();
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|
if (*argptr != NULL) {
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setparam(argptr);
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|
}
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INTON;
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return 0;
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}
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void
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getoptsreset(const char *value)
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|
{
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|
if (number(value) == 1) {
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|
shellparam.optnext = NULL;
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shellparam.reset = 1;
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}
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}
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|
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/*
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* The getopts builtin. Shellparam.optnext points to the next argument
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* to be processed. Shellparam.optptr points to the next character to
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* be processed in the current argument. If shellparam.optnext is NULL,
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* then it's the first time getopts has been called.
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*/
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int
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|
getoptscmd(int argc, char **argv)
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|
{
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|
char **optbase = NULL;
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|
|
|
if (argc < 3)
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|
error("usage: getopts optstring var [arg]");
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|
else if (argc == 3)
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optbase = shellparam.p;
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else
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optbase = &argv[3];
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|
|
|
if (shellparam.reset == 1) {
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|
shellparam.optnext = optbase;
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shellparam.optptr = NULL;
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shellparam.reset = 0;
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}
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|
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return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
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&shellparam.optptr);
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}
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|
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STATIC int
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|
getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
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|
char **optptr)
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|
{
|
|
char *p, *q;
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|
char c = '?';
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|
int done = 0;
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|
int ind = 0;
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|
int err = 0;
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|
char s[10];
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|
|
|
if ((p = *optptr) == NULL || *p == '\0') {
|
|
/* Current word is done, advance */
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|
if (*optnext == NULL)
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|
return 1;
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|
p = **optnext;
|
|
if (p == NULL || *p != '-' || *++p == '\0') {
|
|
atend:
|
|
ind = *optnext - optfirst + 1;
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|
*optnext = NULL;
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|
p = NULL;
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|
done = 1;
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|
goto out;
|
|
}
|
|
(*optnext)++;
|
|
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
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|
goto atend;
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|
}
|
|
|
|
c = *p++;
|
|
for (q = optstr; *q != c; ) {
|
|
if (*q == '\0') {
|
|
if (optstr[0] == ':') {
|
|
s[0] = c;
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|
s[1] = '\0';
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|
err |= setvarsafe("OPTARG", s, 0);
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|
}
|
|
else {
|
|
out1fmt("Illegal option -%c\n", c);
|
|
(void) unsetvar("OPTARG");
|
|
}
|
|
c = '?';
|
|
goto bad;
|
|
}
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = **optnext) == NULL) {
|
|
if (optstr[0] == ':') {
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|
s[0] = c;
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|
s[1] = '\0';
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|
err |= setvarsafe("OPTARG", s, 0);
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|
c = ':';
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|
}
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|
else {
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|
out1fmt("No arg for -%c option\n", c);
|
|
(void) unsetvar("OPTARG");
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|
c = '?';
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|
}
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|
goto bad;
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|
}
|
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|
|
if (p == **optnext)
|
|
(*optnext)++;
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|
setvarsafe("OPTARG", p, 0);
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|
p = NULL;
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|
}
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|
else
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|
setvarsafe("OPTARG", "", 0);
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|
ind = *optnext - optfirst + 1;
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|
goto out;
|
|
|
|
bad:
|
|
ind = 1;
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|
*optnext = NULL;
|
|
p = NULL;
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|
out:
|
|
*optptr = p;
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|
fmtstr(s, sizeof(s), "%d", ind);
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|
err |= setvarsafe("OPTIND", s, VNOFUNC);
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|
s[0] = c;
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|
s[1] = '\0';
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|
err |= setvarsafe(optvar, s, 0);
|
|
if (err) {
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|
*optnext = NULL;
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|
*optptr = NULL;
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|
flushall();
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|
exraise(EXERROR);
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}
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|
return done;
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}
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|
|
/*
|
|
* XXX - should get rid of. have all builtins use getopt(3). the
|
|
* library getopt must have the BSD extension static variable "optreset"
|
|
* otherwise it can't be used within the shell safely.
|
|
*
|
|
* Standard option processing (a la getopt) for builtin routines. The
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|
* only argument that is passed to nextopt is the option string; the
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|
* other arguments are unnecessary. It return the character, or '\0' on
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|
* end of input.
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|
*/
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|
|
|
int
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|
nextopt(char *optstring)
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|
{
|
|
char *p, *q;
|
|
char c;
|
|
|
|
if ((p = optptr) == NULL || *p == '\0') {
|
|
p = *argptr;
|
|
if (p == NULL || *p != '-' || *++p == '\0')
|
|
return '\0';
|
|
argptr++;
|
|
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
|
|
return '\0';
|
|
}
|
|
c = *p++;
|
|
for (q = optstring ; *q != c ; ) {
|
|
if (*q == '\0')
|
|
error("Illegal option -%c", c);
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = *argptr++) == NULL)
|
|
error("No arg for -%c option", c);
|
|
shoptarg = p;
|
|
p = NULL;
|
|
}
|
|
optptr = p;
|
|
return c;
|
|
}
|