options.c

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/*-
 * Copyright (c) 1991 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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
static char sccsid[] = "@(#)options.c   5.2 (Berkeley) 3/13/91";
#endif /* not lint */

#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"

char *arg0;                     /* value of $0 */
struct shparam shellparam;      /* current positional parameters */
char **argptr;                  /* argument list for builtin commands */
char *optarg;                   /* set by nextopt (like getopt) */
char *optptr;                   /* used by nextopt */
int editable;                   /* isatty(0) && isatty(1) */

char *minusc;                   /* argument to -c option */


#ifdef __STDC__
STATIC void options(int);
STATIC void setoption(int, int);
#else
STATIC void options();
STATIC void setoption();
#endif



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

void
procargs(argc, argv)
        char **argv;
        {
        char *p;

        argptr = argv;
        if (argc > 0)
                argptr++;
        for (p = optval ; p < optval + sizeof optval - 1 ; p++)
                *p = 2;
        options(1);
        if (*argptr == NULL && minusc == NULL)
                sflag = 1;
        editable = (isatty(0) && isatty(1));
        if (iflag == 2 && sflag == 1 && editable)
                iflag = 1;
        if (jflag == 2)
                jflag = iflag;
        for (p = optval ; p < optval + sizeof optval - 1 ; p++)
                if (*p == 2)
                        *p = 0;
        arg0 = argv[0];
        if (sflag == 0) {
                arg0 = *argptr++;
                if (minusc == NULL) {
                        commandname = arg0;
                        setinputfile(commandname, 0);
                }
        }
        shellparam.p = argptr;
        /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
        while (*argptr) {
                shellparam.nparam++;
                argptr++;
        }
        setinteractive(iflag);
        setjobctl(jflag);
}



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

STATIC void
options(cmdline) {
        register 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 (c == 'c' && cmdline) {
                                char *q;
#ifdef NOHACK   /* removing this code allows sh -ce 'foo' for compat */
                                if (*p == '\0')
#endif
                                        q = *argptr++;
                                if (q == NULL || minusc != NULL)
                                        error("Bad -c option");
                                minusc = q;
#ifdef NOHACK
                                break;
#endif
                        } else {
                                setoption(c, val);
                        }
                }
                if (! cmdline)
                        break;
        }
}


STATIC void
setoption(flag, val)
        char flag;
        int val;
        {
        register char *p;

        if ((p = strchr(optchar, flag)) == NULL)
                error("Illegal option -%c", flag);
        optval[p - optchar] = val;
}



#ifdef mkinit
INCLUDE "options.h"

SHELLPROC {
        char *p;

        for (p = optval ; p < optval + sizeof optval ; p++)
                *p = 0;
}
#endif


/*
 * Set the shell parameters.
 */

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

        for (nparam = 0 ; argv[nparam] ; nparam++);
        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(param)
        struct shparam *param;
        {
        char **ap;

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



/*
 * The shift builtin command.
 */

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

        n = 1;
        if (argc > 1)
                n = number(argv[1]);
        if (n > shellparam.nparam)
                n = shellparam.nparam;
        INTOFF;
        shellparam.nparam -= n;
        for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
                if (shellparam.malloc)
                        ckfree(*ap1);
        }
        ap2 = shellparam.p;
        while ((*ap2++ = *ap1++) != NULL);
        shellparam.optnext = NULL;
        INTON;
        return 0;
}



/*
 * The set command builtin.
 */

setcmd(argc, argv)  char **argv; {
        if (argc == 1)
                return showvarscmd(argc, argv);
        INTOFF;
        options(0);
        setinteractive(iflag);
        setjobctl(jflag);
        if (*argptr != NULL) {
                setparam(argptr);
        }
        INTON;
        return 0;
}


/*
 * 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.
 */

getoptscmd(argc, argv)  char **argv; {
        register char *p, *q;
        char c;
        char s[10];

        if (argc != 3)
                error("Usage: getopts optstring var");
        if (shellparam.optnext == NULL) {
                shellparam.optnext = shellparam.p;
                shellparam.optptr = NULL;
        }
        if ((p = shellparam.optptr) == NULL || *p == '\0') {
                p = *shellparam.optnext;
                if (p == NULL || *p != '-' || *++p == '\0') {
atend:
                        fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
                        setvar("OPTIND", s, 0);
                        shellparam.optnext = NULL;
                        return 1;
                }
                shellparam.optnext++;
                if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
                        goto atend;
        }
        c = *p++;
        for (q = argv[1] ; *q != c ; ) {
                if (*q == '\0') {
                        out1fmt("Illegal option -%c\n", c);
                        c = '?';
                        goto out;
                }
                if (*++q == ':')
                        q++;
        }
        if (*++q == ':') {
                if (*p == '\0') {
                        if ((p = *shellparam.optnext) == NULL) {
                                out1fmt("No arg for -%c option\n", c);
                                c = '?';
                                goto out;
                        }
                        shellparam.optnext++;
                }
                setvar("OPTARG", p, 0);
                p = "";
        }
out:
        shellparam.optptr = p;
        s[0] = c;
        s[1] = '\0';
        setvar(argv[2], s, 0);
        fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
        setvar("OPTIND", s, 0);
        return 0;
}

/*
 * 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.
 */

int
nextopt(optstring)
        char *optstring;
        {
        register char *p, *q;
        char c;

        if ((p = optptr) == NULL || *p == '\0') {
                p = *argptr;
                if (p == NULL || *p != '-' || *++p == '\0')
                        return '\0';
                argptr++;
                if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
                        return '\0';
        }
        c = *p++;
        for (q = optstring ; *q != c ; ) {
                if (*q == '\0')
                        error("Illegal option -%c", c);
                if (*++q == ':')
                        q++;
        }
        if (*++q == ':') {
                if (*p == '\0' && (p = *argptr++) == NULL)
                        error("No arg for -%c option", c);
                optarg = p;
                p = NULL;
        }
        optptr = p;
        return c;
}

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