d5f6b530fc
This makes sh a bit more friendly in single user mode, make buildenv, chroot and the like, and matches other shells. The -o emacs can be overridden on the command line or in the ENV file.
590 lines
12 KiB
C
590 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 *nextopt_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 != 0 && sflag == 1 && isatty(0) && isatty(1)) {
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iflag = 1;
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if (Eflag == 2)
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Eflag = 1;
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}
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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.reset = 1;
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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.reset = 1;
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INTON;
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return 0;
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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.reset = 1;
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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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return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
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&shellparam.optptr);
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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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{
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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') {
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/* Current word is done, advance */
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if (*optnext == NULL)
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return 1;
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p = **optnext;
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if (p == NULL || *p != '-' || *++p == '\0') {
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atend:
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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;
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}
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(*optnext)++;
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if (p[0] == '-' && p[1] == '\0') /* check for "--" */
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goto atend;
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}
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c = *p++;
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for (q = optstr; *q != c; ) {
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if (*q == '\0') {
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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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}
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else {
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out1fmt("Illegal option -%c\n", c);
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(void) unsetvar("OPTARG");
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}
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c = '?';
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goto bad;
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}
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if (*++q == ':')
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q++;
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}
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if (*++q == ':') {
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if (*p == '\0' && (p = **optnext) == NULL) {
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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);
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(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)
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(*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;
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bad:
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ind = 1;
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*optnext = NULL;
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p = NULL;
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out:
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*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);
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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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/*
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* XXX - should get rid of. have all builtins use getopt(3). the
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* library getopt must have the BSD extension static variable "optreset"
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* otherwise it can't be used within the shell safely.
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*
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* 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(const char *optstring)
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{
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char *p;
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const char *q;
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char c;
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if ((p = nextopt_optptr) == NULL || *p == '\0') {
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p = *argptr;
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if (p == NULL || *p != '-' || *++p == '\0')
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return '\0';
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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;
|
|
}
|
|
nextopt_optptr = p;
|
|
return c;
|
|
}
|