/*      $NetBSD: options.c,v 1.63 2026/05/28 10:07:58 kre Exp $ */

/*-
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)options.c   8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: options.c,v 1.63 2026/05/28 10:07:58 kre Exp $");
#endif
#endif /* not lint */

#include <signal.h>
#include <unistd.h>
#include <stdlib.h>

#include "shell.h"
#define DEFINE_OPTIONS
#include "options.h"
#undef DEFINE_OPTIONS
#include "builtins.h"
#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 "syntax.h"
#ifndef SMALL
#include "myhistedit.h"
#endif
#include "show.h"

char *arg0;                     /* value of $0 */
struct shparam shellparam;      /* current positional parameters */
char **argptr;                  /* argument list for builtin commands */
char *optionarg;                /* set by nextopt (like getopt) */
char *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 int getopts(char *, char *, char **, char ***, char **);


/*
 * Process the shell command line arguments.
 */

void
procargs(int argc, char **argv)
{
        size_t i;
        int psx;

        argptr = argv;
        if (argc > 0)
                argptr++;

        psx = posix;            /* save what we set it to earlier */
        /*
         * option values are mostly boolean 0:off 1:on
         * we use 2 (just in this routine) to mean "unknown yet"
         */
        for (i = 0; i < NOPTS; i++)
                optlist[i].val = 2;
        posix = psx;            /* restore before processing -o ... */

        options(1);

        if (*argptr == NULL && minusc == NULL)
                sflag = 1;
        if (iflag == 2 && sflag == 1 && isatty(0) && isatty(2))
                iflag = 1;
        if (iflag == 1 && sflag == 2)
                iflag = 2;
        if (mflag == 2)
                mflag = iflag;
#ifndef DO_SHAREDVFORK
        if (usefork == 2)
                usefork = 1;
#endif
#if DEBUG >= 2
        if (debug == 2)
                debug = 1;
#endif
        arg0 = argv[0];
        if (loginsh == 2 && arg0 != NULL && arg0[0] == '-')
                loginsh = 1;

        /*
         * Any options not dealt with as special cases just above,
         * and which were not set on the command line, are set to
         * their expected default values (mostly "off")
         *
         * then as each option is initialised, save its setting now
         * as its "default" value for future use ("set -o default").
         */
        for (i = 0; i < NOPTS; i++) {
                if (optlist[i].val == 2)
                        optlist[i].val = optlist[i].dflt;
                optlist[i].dflt = optlist[i].val;
        }

        if (sflag == 0 && minusc == NULL) {
                commandname = argv[0];
                arg0 = *argptr++;
                setinputfile(arg0, 0);
                commandname = arg0;
        }
        /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
        if (minusc != NULL) {
                if (argptr == NULL || *argptr == NULL)
                        error("Bad -c option");
                minusc = *argptr++;
                if (*argptr != 0)
                        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(iflag);
#ifndef SMALL
        histedit();
#endif
        setjobctl(mflag);

        if (privileged && !pflag) {
                setuid(getuid());
                setgid(getgid());
                privileged = 0;
                setvarsafe("PSc", (getuid() == 0 ? "#" : "$"), 0);
        }
}

/*
 * Process shell options.  The global variable argptr contains a pointer
 * to the argument list; we advance it past the options.
 */

STATIC void
options(int cmdline)
{
        static char empty[] = "";
        char *p;
        int val;
        int c;

        if (cmdline)
                minusc = NULL;
        while ((p = *argptr) != NULL) {
                argptr++;
                if ((c = *p++) == '-') {
                        val = 1;
                        if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
                                if (!cmdline) {
                                        /* "-" means turn off -x and -v */
                                        if (p[0] == '\0')
                                                xflag = vflag = 0;
                                        /* "--" means reset params */
                                        else if (*argptr == NULL)
                                                setparam(argptr);
                                }
                                break;    /* "-" or  "--" terminates options */
                        }
                } else if (c == '+') {
                        val = 0;
                } else {
                        argptr--;
                        break;
                }
                while ((c = *p++) != '\0') {
                        if (val == 1 && c == 'c' && cmdline) {
                                /* command is after shell args*/
                                minusc = empty;
                        } else if (c == 'o') {
                                if (*p != '\0')
                                        minus_o(p, val + (cmdline ? val : 0));
                                else if (*argptr)
                                        minus_o(*argptr++,
                                            val + (cmdline ? val : 0));
                                else if (!cmdline)
                                        minus_o(NULL, val);
                                else
                                        error("arg for %co missing", "+-"[val]);
                                break;
#ifdef DEBUG
                        } else if (c == 'D') {
                                if (*p) {
                                        set_debug(p, val);
                                        break;
                                } else if (*argptr)
                                        set_debug(*argptr++, val);
                                else
                                        set_debug("*$", val);
#endif
                        } else if (cmdline && c == 'r') {
                                out1fmt("NetBSD shell: %s\n",
                                    lookupvar("NETBSD_SHELL"));
                                sh_exit(0);
                        } else {
                                setoption(c, val);
                        }
                }
        }
}

static void
set_opt_val(size_t i, int val)
{
        size_t j;
        int flag;

        if (val && (flag = optlist[i].opt_set)) {
                /* some options (eg vi/emacs) are mutually exclusive */
                for (j = 0; j < NOPTS; j++)
                    if (optlist[j].opt_set == flag)
                        optlist[j].val = 0;
        }
#ifndef SMALL
        if (i == _SH_OPT_Xflag)
                xtracefdsetup(val);
#endif
        optlist[i].val = val;
#ifdef DEBUG
        if (&optlist[i].val == &debug)
                opentrace();    /* different "trace" than the -x one... */
#endif
}

STATIC void
minus_o(char *name, int val)
{
        size_t i;
        const char *sep = ": ";

        if (name == NULL) {
                if (val) {
                        out1str("Current option settings");
                        for (i = 0; i < NOPTS; i++) {
                                if (optlist[i].name == NULL)  {
                                        out1fmt("%s%c%c", sep,
                                            "+-"[optlist[i].val],
                                            optlist[i].letter);
                                        sep = ", ";
                                }
                        }
                        out1c('\n');
                        for (i = 0; i < NOPTS; i++) {
                                if (optlist[i].name)
                                    out1fmt("%-19s %s\n", optlist[i].name,
                                        optlist[i].val ? "on" : "off");
                        }
                } else {
                        out1str("set -o default");
                        for (i = 0; i < NOPTS; i++) {
                                if (optlist[i].val == optlist[i].dflt)
                                        continue;
                                if (optlist[i].name)
                                    out1fmt(" %co %s",
                                        "+-"[optlist[i].val], optlist[i].name);
                                else
                                    out1fmt(" %c%c", "+-"[optlist[i].val],
                                        optlist[i].letter);
                        }
                        out1c('\n');
                }
        } else {
                if (val == 1 && equal(name, "default")) { /* special case */
                        for (i = 0; i < NOPTS; i++)
                                set_opt_val(i, optlist[i].dflt);
                        return;
                }
                if (val)
                        val = 1;
                for (i = 0; i < NOPTS; i++)
                        if (optlist[i].name && equal(name, optlist[i].name)) {
                                set_opt_val(i, val);
#ifndef SMALL
                                if (i == _SH_OPT_Xflag)
                                        set_opt_val(_SH_OPT_xflag, val);
#endif
                                return;
                        }
                error("Unknown option %co %s", "+-"[val], name);
        }
}


STATIC void
setoption(int flag, int val)
{
        size_t i;

        for (i = 0; i < NOPTS; i++)
                if (optlist[i].letter == flag) {
                        set_opt_val(i, val);
#ifndef SMALL
                        if (i == _SH_OPT_Xflag)
                                set_opt_val(_SH_OPT_xflag, val);
#endif
                        return;
                }
        error("Unknown option %c%c", "+-"[val], flag);
        /* NOTREACHED */
}



#ifdef mkinit
INCLUDE "options.h"

SHELLPROC {
        int i;

        for (i = 0; optlist[i].name; i++)
                optlist[i].val = 0;
        optschanged();

}
#endif


/*
 * Set the shell parameters.
 */

void
setparam(char **argv)
{
        char **newparam;
        char **ap;
        int nparam;

        for (nparam = 0 ; argv[nparam] ; nparam++)
                continue;
        ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
        while (*argv) {
                *ap++ = savestr(*argv++);
        }
        *ap = NULL;
        freeparam(&shellparam);
        shellparam.malloc = 1;
        shellparam.nparam = nparam;
        shellparam.p = newparam;
        shellparam.optnext = NULL;
}


/*
 * Free the list of positional parameters.
 */

void
freeparam(volatile struct shparam *param)
{
        char **ap;

        if (param->malloc) {
                for (ap = param->p ; *ap ; ap++)
                        ckfree(*ap);
                ckfree(param->p);
        }
}



/*
 * The shift builtin command.
 */

#ifndef TINY
/* first the rotate variant */
static inline int
rotatecmd(int argc, char **argv)
{
        int n;
        char **ap1, **ap2, **ss;

        (void) nextopt(NULL);   /* ignore '--' as leading option */

        /*
         * half this is just in case it ever becomes
         * a separate named command, while it remains
         * puerly an inline inside shift, the compiler
         * should optimise most of it to nothingness
         */
        if (argptr[0] && argptr[1])
                error("Usage: rotate [n]");
        n = 1;
        if (*argptr) {
                if (**argptr == '-')
                        n = number(*argptr + 1);
                else            /* anti-clockwise n == clockwise $# - n */
                        n = shellparam.nparam - number(*argptr);
        }

        if (n == 0 || n == shellparam.nparam)           /* nothing to do */
                return 0;

        if (n < 0 || n > shellparam.nparam)
                error("can't rotate that many");

        ap2 = ss = (char **)stalloc(n * sizeof(char *));
        INTOFF;
        for (ap1 = shellparam.p + shellparam.nparam - n;
             ap1 < shellparam.p + shellparam.nparam; )
                *ap2++ = *ap1++;
        for (ap2 = shellparam.p + shellparam.nparam, ap1 = ap2 - n;
             ap1 > shellparam.p; )
                *--ap2 = *--ap1;
        for (ap1 = ss + n; ap1 > ss; )
                *--ap2 = *--ap1;
        shellparam.optnext = NULL;
        INTON;
        stunalloc(ss);

        return 0;
}
#endif

int
shiftcmd(int argc, char **argv)
{
        int n;
        char **ap1, **ap2;

        (void) nextopt(NULL);   /* ignore '--' as leading option */

        if (argptr[0] && argptr[1])
                error("Usage: shift [n]");

#ifndef TINY
        if (*argptr && **argptr == '-') {
                argptr = argv + 1;      /* reinit nextopt() */
                optptr = NULL;
                return rotatecmd(argc, argv);
        }
#endif

        n = 1;
        if (*argptr)
                n = number(*argptr);
        if (n > shellparam.nparam)
                error("can't shift that many");
        INTOFF;
        shellparam.nparam -= n;
        for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
                if (shellparam.malloc)
                        ckfree(*ap1);
        }
        ap2 = shellparam.p;
        while ((*ap2++ = *ap1++) != NULL)
                continue;
        shellparam.optnext = NULL;
        INTON;
        return 0;
}



/*
 * The set command builtin.
 */

int
setcmd(int argc, char **argv)
{
        if (argc == 1)
                return showvars(0, 0, 1, 0);
        INTOFF;
        options(0);
        optschanged();
        if (*argptr != NULL) {
                setparam(argptr);
        }
        INTON;
        return 0;
}


void
getoptsreset(const char *value, int flags __unused, struct var *vp __unused)
{
        /*
         * This is just to detect the case where OPTIND=1
         * is executed.   Any other string assigned to OPTIND
         * is OK, but is not a reset.   No errors, so cannot use number()
         */
        if (is_digit(*value) && strtol(value, NULL, 10) == 1) {
                shellparam.optnext = NULL;
                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;

        if (argc < 3)
                error("usage: getopts optstring var [arg]");
        else if (argc == 3)
                optbase = shellparam.p;
        else
                optbase = &argv[3];

        if (shellparam.reset == 1) {
                shellparam.optnext = optbase;
                shellparam.optptr = NULL;
                shellparam.reset = 0;
        }

        return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
                       &shellparam.optptr);
}

STATIC int
getopts(char *optstr, char *optvar, char **optfirst,
    char ***optnext, char **optpptr)
{
        char *p, *q;
        char c = '?';
        int done = 0;
        int ind = 0;
        int err = 0;
        char s[12];

        if ((p = *optpptr) == 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';
                                err |= setvarsafe("OPTARG", s, 0);
                        } else {
                                outfmt(&errout, "Unknown option -%c\n", c);
                                (void) unsetvar("OPTARG", 0);
                        }
                        c = '?';
                        goto bad;
                }
                if (*++q == ':')
                        q++;
        }

        if (*++q == ':') {
                if (*p == '\0' && (p = **optnext) == NULL) {
                        if (optstr[0] == ':') {
                                s[0] = c;
                                s[1] = '\0';
                                err |= setvarsafe("OPTARG", s, 0);
                                c = ':';
                        } else {
                                outfmt(&errout, "No arg for -%c option\n", c);
                                (void) unsetvar("OPTARG", 0);
                                c = '?';
                        }
                        goto bad;
                }

                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;
}