/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include "shell.h"
#define DEFINE_OPTIONS
#include "options.h"
#undef DEFINE_OPTIONS
#include "nodes.h" /* for other header files */
#include "eval.h"
#include "jobs.h"
#include "input.h"
#include "output.h"
#include "trap.h"
#include "var.h"
#include "memalloc.h"
#include "error.h"
#include "mystring.h"
#include "builtins.h"
#ifndef NO_HISTORY
#include "myhistedit.h"
#endif
char *arg0; /* value of $0 */
struct shparam shellparam; /* current positional parameters */
char **argptr; /* argument list for builtin commands */
char *shoptarg; /* set by nextopt (like getopt) */
char *nextopt_optptr; /* used by nextopt */
char *minusc; /* argument to -c option */
static void options(int);
static void minus_o(char *, int);
static void setoption(int, int);
static void setoptionbyindex(int, int);
static void setparam(int, char **);
static int getopts(char *, char *, char **, char ***, char **);
/*
* Process the shell command line arguments.
*/
void
procargs(int argc, char **argv)
{
int i;
char *scriptname;
argptr = argv;
if (argc > 0)
argptr++;
for (i = 0; i < NOPTS; i++)
optval[i] = 2;
privileged = (getuid() != geteuid() || getgid() != getegid());
options(1);
if (*argptr == NULL && minusc == NULL)
sflag = 1;
if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
iflag = 1;
if (Eflag == 2)
Eflag = 1;
}
if (mflag == 2)
mflag = iflag;
for (i = 0; i < NOPTS; i++)
if (optval[i] == 2)
optval[i] = 0;
arg0 = argv[0];
if (sflag == 0 && minusc == NULL) {
scriptname = *argptr++;
setinputfile(scriptname, 0);
commandname = arg0 = scriptname;
}
/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
if (argptr && minusc && *argptr)
arg0 = *argptr++;
shellparam.p = argptr;
shellparam.reset = 1;
/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
while (*argptr) {
shellparam.nparam++;
argptr++;
}
optschanged();
}
void
optschanged(void)
{
setinteractive();
#ifndef NO_HISTORY
histedit();
#endif
setjobctl(mflag);
}
/*
* Process shell options. The global variable argptr contains a pointer
* to the argument list; we advance it past the options.
* If cmdline is true, process the shell's argv; otherwise, process arguments
* to the set special builtin.
*/
static void
options(int cmdline)
{
char *kp, *p;
int val;
int c;
if (cmdline)
minusc = NULL;
while ((p = *argptr) != NULL) {
argptr++;
if ((c = *p++) == '-') {
val = 1;
/* A "-" or "--" terminates options */
if (p[0] == '\0')
goto end_options1;
if (p[0] == '-' && p[1] == '\0')
goto end_options2;
/**
* For the benefit of `#!' lines in shell scripts,
* treat a string of '-- *#.*' the same as '--'.
* This is needed so that a script starting with:
* #!/bin/sh -- # -*- perl -*-
* will continue to work after a change is made to
* kern/imgact_shell.c to NOT token-ize the options
* specified on a '#!' line. A bit of a kludge,
* but that trick is recommended in documentation
* for some scripting languages, and we might as
* well continue to support it.
*/
if (p[0] == '-') {
kp = p + 1;
while (*kp == ' ' || *kp == '\t')
kp++;
if (*kp == '#' || *kp == '\0')
goto end_options2;
}
} else if (c == '+') {
val = 0;
} else {
argptr--;
break;
}
while ((c = *p++) != '\0') {
if (c == 'c' && cmdline) {
char *q;
q = *argptr++;
if (q == NULL || minusc != NULL)
error("Bad -c option");
minusc = q;
} else if (c == 'o') {
minus_o(*argptr, val);
if (*argptr)
argptr++;
} else
setoption(c, val);
}
}
return;
/* When processing `set', a single "-" means turn off -x and -v */
end_options1:
if (!cmdline) {
xflag = vflag = 0;
return;
}
/*
* When processing `set', a "--" means the remaining arguments
* replace the positional parameters in the active shell. If
* there are no remaining options, then all the positional
* parameters are cleared (equivalent to doing ``shift $#'').
*/
end_options2:
if (!cmdline) {
if (*argptr == NULL)
setparam(0, argptr);
return;
}
/*
* At this point we are processing options given to 'sh' on a command
* line. If an end-of-options marker ("-" or "--") is followed by an
* arg of "#", then skip over all remaining arguments. Some scripting
* languages (e.g.: perl) document that /bin/sh will implement this
* behavior, and they recommend that users take advantage of it to
* solve certain issues that can come up when writing a perl script.
* Yes, this feature is in /bin/sh to help users write perl scripts.
*/
p = *argptr;
if (p != NULL && p[0] == '#' && p[1] == '\0') {
while (*argptr != NULL)
argptr++;
/* We need to keep the final argument */
argptr--;
}
}
static void
minus_o(char *name, int val)
{
int i;
const unsigned char *on;
size_t len;
if (name == NULL) {
if (val) {
/* "Pretty" output. */
out1str("Current option settings\n");
for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
out1fmt("%-16.*s%s\n", *on, on + 1,
optval[i] ? "on" : "off");
} else {
/* Output suitable for re-input to shell. */
for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
out1fmt("%s %co %.*s%s",
i % 6 == 0 ? "set" : "",
optval[i] ? '-' : '+',
*on, on + 1,
i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
}
} else {
len = strlen(name);
for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
if (*on == len && memcmp(on + 1, name, len) == 0) {
setoptionbyindex(i, val);
return;
}
error("Illegal option -o %s", name);
}
}
static void
setoptionbyindex(int idx, int val)
{
if (&optval[idx] == &privileged && !val && privileged) {
if (setgid(getgid()) == -1)
error("setgid");
if (setuid(getuid()) == -1)
error("setuid");
}
optval[idx] = val;
if (val) {
/* #%$ hack for ksh semantics */
if (&optval[idx] == &Vflag)
Eflag = 0;
else if (&optval[idx] == &Eflag)
Vflag = 0;
}
}
static void
setoption(int flag, int val)
{
int i;
for (i = 0; i < NSHORTOPTS; i++)
if (optletter[i] == flag) {
setoptionbyindex(i, val);
return;
}
error("Illegal option -%c", flag);
}
/*
* Set the shell parameters.
*/
static void
setparam(int argc, char **argv)
{
char **newparam;
char **ap;
ap = newparam = ckmalloc((argc + 1) * sizeof *ap);
while (*argv) {
*ap++ = savestr(*argv++);
}
*ap = NULL;
freeparam(&shellparam);
shellparam.malloc = 1;
shellparam.nparam = argc;
shellparam.p = newparam;
shellparam.optp = NULL;
shellparam.reset = 1;
shellparam.optnext = NULL;
}
/*
* Free the list of positional parameters.
*/
void
freeparam(struct shparam *param)
{
char **ap;
if (param->malloc) {
for (ap = param->p ; *ap ; ap++)
ckfree(*ap);
ckfree(param->p);
}
if (param->optp) {
for (ap = param->optp ; *ap ; ap++)
ckfree(*ap);
ckfree(param->optp);
}
}
/*
* The shift builtin command.
*/
int
shiftcmd(int argc, char **argv)
{
int i, n;
n = 1;
if (argc > 1)
n = number(argv[1]);
if (n > shellparam.nparam)
return 1;
INTOFF;
shellparam.nparam -= n;
if (shellparam.malloc)
for (i = 0; i < n; i++)
ckfree(shellparam.p[i]);
memmove(shellparam.p, shellparam.p + n,
(shellparam.nparam + 1) * sizeof(shellparam.p[0]));
shellparam.reset = 1;
INTON;
return 0;
}
/*
* The set builtin command.
*/
int
setcmd(int argc, char **argv)
{
if (argc == 1)
return showvarscmd(argc, argv);
INTOFF;
options(0);
optschanged();
if (*argptr != NULL) {
setparam(argc - (argptr - argv), argptr);
}
INTON;
return 0;
}
void
getoptsreset(const char *value)
{
while (*value == '0')
value++;
if (strcmp(value, "1") == 0)
shellparam.reset = 1;
}
/*
* The getopts builtin. Shellparam.optnext points to the next argument
* to be processed. Shellparam.optptr points to the next character to
* be processed in the current argument. If shellparam.optnext is NULL,
* then it's the first time getopts has been called.
*/
int
getoptscmd(int argc, char **argv)
{
char **optbase = NULL, **ap;
int i;
if (argc < 3)
error("usage: getopts optstring var [arg]");
if (shellparam.reset == 1) {
INTOFF;
if (shellparam.optp) {
for (ap = shellparam.optp ; *ap ; ap++)
ckfree(*ap);
ckfree(shellparam.optp);
shellparam.optp = NULL;
}
if (argc > 3) {
shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
for (i = 0; i < argc - 3; i++)
shellparam.optp[i] = savestr(argv[i + 3]);
}
INTON;
optbase = argc == 3 ? shellparam.p : shellparam.optp;
shellparam.optnext = optbase;
shellparam.optptr = NULL;
shellparam.reset = 0;
} else
optbase = shellparam.optp ? shellparam.optp : shellparam.p;
return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
&shellparam.optptr);
}
static int
getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
char **optptr)
{
char *p, *q;
char c = '?';
int done = 0;
int ind = 0;
int err = 0;
char s[10];
const char *newoptarg = NULL;
if ((p = *optptr) == NULL || *p == '\0') {
/* Current word is done, advance */
if (*optnext == NULL)
return 1;
p = **optnext;
if (p == NULL || *p != '-' || *++p == '\0') {
atend:
ind = *optnext - optfirst + 1;
*optnext = NULL;
p = NULL;
done = 1;
goto out;
}
(*optnext)++;
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
goto atend;
}
c = *p++;
for (q = optstr; *q != c; ) {
if (*q == '\0') {
if (optstr[0] == ':') {
s[0] = c;
s[1] = '\0';
newoptarg = s;
}
else
out2fmt_flush("Illegal option -%c\n", c);
c = '?';
goto out;
}
if (*++q == ':')
q++;
}
if (*++q == ':') {
if (*p == '\0' && (p = **optnext) == NULL) {
if (optstr[0] == ':') {
s[0] = c;
s[1] = '\0';
newoptarg = s;
c = ':';
}
else {
out2fmt_flush("No arg for -%c option\n", c);
c = '?';
}
goto out;
}
if (p == **optnext)
(*optnext)++;
newoptarg = p;
p = NULL;
}
out:
if (*optnext != NULL)
ind = *optnext - optfirst + 1;
*optptr = p;
if (newoptarg != NULL)
err |= setvarsafe("OPTARG", newoptarg, 0);
else {
INTOFF;
err |= unsetvar("OPTARG");
INTON;
}
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;
*optptr = NULL;
flushall();
exraise(EXERROR);
}
return done;
}
/*
* 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 returns the option, or '\0' on
* end of input.
*/
int
nextopt(const char *optstring)
{
char *p;
const char *q;
char c;
if ((p = nextopt_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;
}
nextopt_optptr = p;
return c;
}
