650 lines
14 KiB
C
650 lines
14 KiB
C
/* $NetBSD: options.c,v 1.58 2022/09/18 06:03:19 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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#include <sys/cdefs.h>
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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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#else
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__RCSID("$NetBSD: options.c,v 1.58 2022/09/18 06:03:19 kre Exp $");
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#endif
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#endif /* not lint */
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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 "builtins.h"
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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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#include "syntax.h"
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#ifndef SMALL
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#include "myhistedit.h"
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#endif
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#include "show.h"
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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 *optionarg; /* 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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size_t i;
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int psx;
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argptr = argv;
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if (argc > 0)
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argptr++;
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psx = posix; /* save what we set it to earlier */
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/*
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* option values are mostly boolean 0:off 1:on
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* we use 2 (just in this routine) to mean "unknown yet"
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*/
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for (i = 0; i < NOPTS; i++)
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optlist[i].val = 2;
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posix = psx; /* restore before processing -o ... */
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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(2))
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iflag = 1;
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if (iflag == 1 && sflag == 2)
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iflag = 2;
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if (mflag == 2)
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mflag = iflag;
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#ifndef DO_SHAREDVFORK
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if (usefork == 2)
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usefork = 1;
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#endif
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#if DEBUG >= 2
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if (debug == 2)
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debug = 1;
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#endif
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arg0 = argv[0];
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if (loginsh == 2 && arg0 != NULL && arg0[0] == '-')
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loginsh = 1;
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/*
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* Any options not dealt with as special cases just above,
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* and which were not set on the command line, are set to
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* their expected default values (mostly "off")
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*
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* then as each option is initialised, save its setting now
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* as its "default" value for future use ("set -o default").
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*/
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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 = optlist[i].dflt;
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optlist[i].dflt = optlist[i].val;
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}
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if (sflag == 0 && minusc == NULL) {
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commandname = argv[0];
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arg0 = *argptr++;
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setinputfile(arg0, 0);
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commandname = arg0;
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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 (minusc != NULL) {
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if (argptr == NULL || *argptr == NULL)
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error("Bad -c option");
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minusc = *argptr++;
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if (*argptr != 0)
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arg0 = *argptr++;
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}
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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 SMALL
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histedit();
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#endif
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setjobctl(mflag);
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if (privileged && !pflag) {
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setuid(getuid());
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setgid(getgid());
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privileged = 0;
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setvarsafe("PSc", (getuid() == 0 ? "#" : "$"), 0);
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}
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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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static char empty[] = "";
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char *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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if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
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if (!cmdline) {
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/* "-" means turn off -x and -v */
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if (p[0] == '\0')
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xflag = vflag = 0;
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/* "--" means reset params */
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else if (*argptr == NULL)
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setparam(argptr);
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}
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break; /* "-" or "--" terminates options */
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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 (val == 1 && c == 'c' && cmdline) {
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/* command is after shell args*/
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minusc = empty;
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} else if (c == 'o') {
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if (*p != '\0')
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minus_o(p, val + (cmdline ? val : 0));
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else if (*argptr)
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minus_o(*argptr++,
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val + (cmdline ? val : 0));
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else if (!cmdline)
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minus_o(NULL, val);
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else
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error("arg for %co missing", "+-"[val]);
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break;
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#ifdef DEBUG
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} else if (c == 'D') {
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if (*p) {
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set_debug(p, val);
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break;
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} else if (*argptr)
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set_debug(*argptr++, val);
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else
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set_debug("*$", val);
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#endif
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} else {
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setoption(c, val);
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}
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}
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}
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}
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static void
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set_opt_val(size_t i, int val)
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{
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size_t j;
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int flag;
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if (val && (flag = optlist[i].opt_set)) {
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/* some options (eg vi/emacs) are mutually exclusive */
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for (j = 0; j < NOPTS; j++)
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if (optlist[j].opt_set == flag)
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optlist[j].val = 0;
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}
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#ifndef SMALL
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if (i == _SH_OPT_Xflag)
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xtracefdsetup(val);
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#endif
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optlist[i].val = val;
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#ifdef DEBUG
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if (&optlist[i].val == &debug)
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opentrace(); /* different "trace" than the -x one... */
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#endif
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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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size_t i;
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const char *sep = ": ";
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if (name == NULL) {
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if (val) {
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out1str("Current option settings");
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for (i = 0; i < NOPTS; i++) {
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if (optlist[i].name == NULL) {
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out1fmt("%s%c%c", sep,
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"+-"[optlist[i].val],
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optlist[i].letter);
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sep = ", ";
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}
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}
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out1c('\n');
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for (i = 0; i < NOPTS; i++) {
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if (optlist[i].name)
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out1fmt("%-19s %s\n", optlist[i].name,
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optlist[i].val ? "on" : "off");
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}
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} else {
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out1str("set -o default");
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for (i = 0; i < NOPTS; i++) {
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if (optlist[i].val == optlist[i].dflt)
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continue;
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if (optlist[i].name)
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out1fmt(" %co %s",
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"+-"[optlist[i].val], optlist[i].name);
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else
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out1fmt(" %c%c", "+-"[optlist[i].val],
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optlist[i].letter);
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}
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out1c('\n');
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}
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} else {
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if (val == 1 && equal(name, "default")) { /* special case */
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for (i = 0; i < NOPTS; i++)
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set_opt_val(i, optlist[i].dflt);
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return;
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}
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if (val)
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val = 1;
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for (i = 0; i < NOPTS; i++)
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if (optlist[i].name && equal(name, optlist[i].name)) {
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set_opt_val(i, val);
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#ifndef SMALL
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if (i == _SH_OPT_Xflag)
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set_opt_val(_SH_OPT_xflag, val);
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#endif
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return;
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}
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error("Unknown option %co %s", "+-"[val], 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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size_t i;
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for (i = 0; i < NOPTS; i++)
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if (optlist[i].letter == flag) {
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set_opt_val(i, val);
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#ifndef SMALL
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if (i == _SH_OPT_Xflag)
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set_opt_val(_SH_OPT_xflag, val);
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#endif
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return;
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}
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error("Unknown option %c%c", "+-"[val], flag);
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/* NOTREACHED */
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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; optlist[i].name; 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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continue;
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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(volatile 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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if (argc > 2)
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error("Usage: shift [n]");
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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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error("can't shift that many");
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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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continue;
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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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* 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 showvars(0, 0, 1, 0);
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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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/*
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* This is just to detect the case where OPTIND=1
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* is executed. Any other string assigned to OPTIND
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* is OK, but is not a reset. No errors, so cannot use number()
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*/
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if (is_digit(*value) && strtol(value, NULL, 10) == 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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* 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;
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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, char **optpptr)
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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[12];
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if ((p = *optpptr) == 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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} else {
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outfmt(&errout, "Unknown option -%c\n", c);
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(void) unsetvar("OPTARG", 0);
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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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} else {
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outfmt(&errout, "No arg for -%c option\n", c);
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(void) unsetvar("OPTARG", 0);
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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)++;
|
|
err |= setvarsafe("OPTARG", p, 0);
|
|
p = NULL;
|
|
} else
|
|
err |= setvarsafe("OPTARG", "", 0);
|
|
ind = *optnext - optfirst + 1;
|
|
goto out;
|
|
|
|
bad:
|
|
ind = 1;
|
|
*optnext = NULL;
|
|
p = NULL;
|
|
out:
|
|
*optpptr = p;
|
|
fmtstr(s, sizeof(s), "%d", ind);
|
|
err |= setvarsafe("OPTIND", s, VNOFUNC);
|
|
s[0] = c;
|
|
s[1] = '\0';
|
|
err |= setvarsafe(optvar, s, 0);
|
|
if (err) {
|
|
*optnext = NULL;
|
|
*optpptr = NULL;
|
|
flushall();
|
|
exraise(EXERROR);
|
|
}
|
|
return done;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* only argument that is passed to nextopt is the option string; the
|
|
* other arguments are unnecessary. It return the character, or '\0' on
|
|
* end of input. If optstring is NULL, then there are no options, and
|
|
* args are allowed to begin with '-', but a single leading "--" will be
|
|
* discarded. This is for some POSIX special builtins that require
|
|
* -- processing, have no args, and we never did opt processing before
|
|
* and need to retain backwards compat.
|
|
*/
|
|
|
|
int
|
|
nextopt(const char *optstring)
|
|
{
|
|
char *p;
|
|
const char *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';
|
|
if (optstring == NULL) /* not processing the "option" */
|
|
argptr--; /* so make it be an arg again */
|
|
}
|
|
if (optstring == NULL)
|
|
return '\0';
|
|
c = *p++;
|
|
for (q = optstring ; *q != c ; ) {
|
|
if (*q == '\0')
|
|
error("Unknown option -%c", c);
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = *argptr++) == NULL)
|
|
error("No arg for -%c option", c);
|
|
optionarg = p;
|
|
p = NULL;
|
|
}
|
|
optptr = p;
|
|
return c;
|
|
}
|