Subversion Repositories HelenOS

/*  $NetBSD: getopt_long.c,v 1.21.4.1 2008/01/09 01:34:14 matt Exp $    */

/*-

 * Copyright (c) 2000 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Dieter Baron and Thomas Klausner.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.

 */

/* Ported to HelenOS August 2008 by Tim Post <echo@echoreply.us> */

#include <assert.h>

#include <stdarg.h>

#include <err.h>

#include <errno.h>

#include <getopt.h>

#include <stdlib.h>

#include <string.h>

/* HelenOS Port : We're incorporating only the modern getopt_long with wrappers

 * to keep legacy getopt() usage from breaking. All references to REPLACE_GETOPT

 * are dropped, we just include the code */

int opterr = 1;     /* if error message should be printed */

int optind = 1;     /* index into parent argv vector */

int optopt = '?';       /* character checked for validity */

int optreset;       /* reset getopt */

char *optarg;       /* argument associated with option */

#define IGNORE_FIRST    (*options == '-' || *options == '+')

#define PRINT_ERROR ((opterr) && ((*options != ':') \

                      || (IGNORE_FIRST && options[1] != ':')))

/*HelenOS Port - POSIXLY_CORRECT is always false */

#define IS_POSIXLY_CORRECT 0

#define PERMUTE         (!IS_POSIXLY_CORRECT && !IGNORE_FIRST)

/* XXX: GNU ignores PC if *options == '-' */

#define IN_ORDER        (!IS_POSIXLY_CORRECT && *options == '-')

/* return values */

#define BADCH   (int)'?'

#define BADARG      ((IGNORE_FIRST && options[1] == ':') \

             || (*options == ':') ? (int)':' : (int)'?')

#define INORDER (int)1

#define EMSG    ""

static int getopt_internal(int, char **, const char *);

static int gcd(int, int);

static void permute_args(int, int, int, char **);

static const char *place = EMSG; /* option letter processing */

/* XXX: set optreset to 1 rather than these two */

static int nonopt_start = -1; /* first non option argument (for permute) */

static int nonopt_end = -1;   /* first option after non options (for permute) */

/* Error messages */

/* HelenOS Port: Calls to warnx() were eliminated (as we have no stderr that

 * may be redirected) and replaced with printf. As such, error messages now

 * end in a newline */

static const char recargchar[] = "option requires an argument -- %c\n";

static const char recargstring[] = "option requires an argument -- %s\n";

static const char ambig[] = "ambiguous option -- %.*s\n";

static const char noarg[] = "option doesn't take an argument -- %.*s\n";

static const char illoptchar[] = "unknown option -- %c\n";

static const char illoptstring[] = "unknown option -- %s\n";

/*

 * Compute the greatest common divisor of a and b.

 */

static int

gcd(a, b)

    int a;

    int b;

{

    int c;

    c = a % b;

    while (c != 0) {

        a = b;

        b = c;

        c = a % b;

    }

    return b;

}

/*

 * Exchange the block from nonopt_start to nonopt_end with the block

 * from nonopt_end to opt_end (keeping the same order of arguments

 * in each block).

 */

static void

permute_args(panonopt_start, panonopt_end, opt_end, nargv)

    int panonopt_start;

    int panonopt_end;

    int opt_end;

    char **nargv;

{

    int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;

    char *swap;

    assert(nargv != NULL);

    /*

     * compute lengths of blocks and number and size of cycles

     */

    nnonopts = panonopt_end - panonopt_start;

    nopts = opt_end - panonopt_end;

    ncycle = gcd(nnonopts, nopts);

    cyclelen = (opt_end - panonopt_start) / ncycle;

    for (i = 0; i < ncycle; i++) {

        cstart = panonopt_end+i;

        pos = cstart;

        for (j = 0; j < cyclelen; j++) {

            if (pos >= panonopt_end)

                pos -= nnonopts;

            else

                pos += nopts;

            swap = nargv[pos];

            nargv[pos] = nargv[cstart];

            nargv[cstart] = swap;

        }

    }

}

/*

 * getopt_internal --

 *  Parse argc/argv argument vector.  Called by user level routines.

 *  Returns -2 if -- is found (can be long option or end of options marker).

 */

static int

getopt_internal(nargc, nargv, options)

    int nargc;

    char **nargv;

    const char *options;

{

    char *oli;              /* option letter list index */

    int optchar;

    assert(nargv != NULL);

    assert(options != NULL);

    optarg = NULL;

    /*

     * XXX Some programs (like rsyncd) expect to be able to

     * XXX re-initialize optind to 0 and have getopt_long(3)

     * XXX properly function again.  Work around this braindamage.

     */

    if (optind == 0)

        optind = 1;

    if (optreset)

        nonopt_start = nonopt_end = -1;

start:

    if (optreset || !*place) {      /* update scanning pointer */

        optreset = 0;

        if (optind >= nargc) {          /* end of argument vector */

            place = EMSG;

            if (nonopt_end != -1) {

                /* do permutation, if we have to */

                permute_args(nonopt_start, nonopt_end,

                    optind, nargv);

                optind -= nonopt_end - nonopt_start;

            }

            else if (nonopt_start != -1) {

                /*

                 * If we skipped non-options, set optind

                 * to the first of them.

                 */

                optind = nonopt_start;

            }

            nonopt_start = nonopt_end = -1;

            return -1;

        }

        if ((*(place = nargv[optind]) != '-')

            || (place[1] == '\0')) {    /* found non-option */

            place = EMSG;

            if (IN_ORDER) {

                /*

                 * GNU extension:

                 * return non-option as argument to option 1

                 */

                optarg = nargv[optind++];

                return INORDER;

            }

            if (!PERMUTE) {

                /*

                 * if no permutation wanted, stop parsing

                 * at first non-option

                 */

                return -1;

            }

            /* do permutation */

            if (nonopt_start == -1)

                nonopt_start = optind;

            else if (nonopt_end != -1) {

                permute_args(nonopt_start, nonopt_end,

                    optind, nargv);

                nonopt_start = optind -

                    (nonopt_end - nonopt_start);

                nonopt_end = -1;

            }

            optind++;

            /* process next argument */

            goto start;

        }

        if (nonopt_start != -1 && nonopt_end == -1)

            nonopt_end = optind;

        if (place[1] && *++place == '-') {  /* found "--" */

            place++;

            return -2;

        }

    }

    if ((optchar = (int)*place++) == (int)':' ||

        (oli = strchr(options + (IGNORE_FIRST ? 1 : 0), optchar)) == NULL) {

        /* option letter unknown or ':' */

        if (!*place)

            ++optind;

        if (PRINT_ERROR)

            printf(illoptchar, optchar);

        optopt = optchar;

        return BADCH;

    }

    if (optchar == 'W' && oli[1] == ';') {      /* -W long-option */

        /* XXX: what if no long options provided (called by getopt)? */

        if (*place)

            return -2;

        if (++optind >= nargc) {    /* no arg */

            place = EMSG;

            if (PRINT_ERROR)

                printf(recargchar, optchar);

            optopt = optchar;

            return BADARG;

        } else              /* white space */

            place = nargv[optind];

        /*

         * Handle -W arg the same as --arg (which causes getopt to

         * stop parsing).

         */

        return -2;

    }

    if (*++oli != ':') {            /* doesn't take argument */

        if (!*place)

            ++optind;

    } else {                /* takes (optional) argument */

        optarg = NULL;

        if (*place)         /* no white space */

            optarg = *place;

        /* XXX: disable test for :: if PC? (GNU doesn't) */

        else if (oli[1] != ':') {   /* arg not optional */

            if (++optind >= nargc) {    /* no arg */

                place = EMSG;

                if (PRINT_ERROR)

                    printf(recargchar, optchar);

                optopt = optchar;

                return BADARG;

            } else

                optarg = nargv[optind];

        }

        place = EMSG;

        ++optind;

    }

    /* dump back option letter */

    return optchar;

}

/*

 * getopt --

 *  Parse argc/argv argument vector.

 */

int

getopt(nargc, nargv, options)

    int nargc;

    char * const *nargv;

    const char *options;

{

    int retval;

    assert(nargv != NULL);

    assert(options != NULL);

    retval = getopt_internal(nargc, (char **)nargv, options);

    if (retval == -2) {

        ++optind;

        /*

         * We found an option (--), so if we skipped non-options,

         * we have to permute.

         */

        if (nonopt_end != -1) {

            permute_args(nonopt_start, nonopt_end, optind,

                       (char **)nargv);

            optind -= nonopt_end - nonopt_start;

        }

        nonopt_start = nonopt_end = -1;

        retval = -1;

    }

    return retval;

}

/*

 * getopt_long --

 *  Parse argc/argv argument vector.

 */

int

getopt_long(nargc, nargv, options, long_options, idx)

    int nargc;

    char * const *nargv;

    const char *options;

    const struct option *long_options;

    int *idx;

{

    int retval;

#define IDENTICAL_INTERPRETATION(_x, _y)                \

    (long_options[(_x)].has_arg == long_options[(_y)].has_arg &&    \

     long_options[(_x)].flag == long_options[(_y)].flag &&      \

     long_options[(_x)].val == long_options[(_y)].val)

    assert(nargv != NULL);

    assert(options != NULL);

    assert(long_options != NULL);

    /* idx may be NULL */

    retval = getopt_internal(nargc, (char **)nargv, options);

    if (retval == -2) {

        char *current_argv, *has_equal;

        size_t current_argv_len;

        int i, ambiguous, match;

        current_argv = (char *)place;

        match = -1;

        ambiguous = 0;

        optind++;

        place = EMSG;

        if (*current_argv == '\0') {        /* found "--" */

            /*

             * We found an option (--), so if we skipped

             * non-options, we have to permute.

             */

            if (nonopt_end != -1) {

                permute_args(nonopt_start, nonopt_end,

                    optind, (char **)nargv);

                optind -= nonopt_end - nonopt_start;

            }

            nonopt_start = nonopt_end = -1;

            return -1;

        }

        if ((has_equal = strchr(current_argv, '=')) != NULL) {

            /* argument found (--option=arg) */

            current_argv_len = has_equal - current_argv;

            has_equal++;

        } else

            current_argv_len = strlen(current_argv);

        for (i = 0; long_options[i].name; i++) {

            /* find matching long option */

            if (strncmp(current_argv, long_options[i].name,

                current_argv_len))

                continue;

            if (strlen(long_options[i].name) ==

                (unsigned)current_argv_len) {

                /* exact match */

                match = i;

                ambiguous = 0;

                break;

            }

            if (match == -1)        /* partial match */

                match = i;

            else if (!IDENTICAL_INTERPRETATION(i, match))

                ambiguous = 1;

        }

        if (ambiguous) {

            /* ambiguous abbreviation */

            if (PRINT_ERROR)

                printf(ambig, (int)current_argv_len,

                     current_argv);

            optopt = 0;

            return BADCH;

        }

        if (match != -1) {          /* option found */

                if (long_options[match].has_arg == no_argument

                && has_equal) {

                if (PRINT_ERROR)

                    printf(noarg, (int)current_argv_len,

                         current_argv);

                /*

                 * XXX: GNU sets optopt to val regardless of

                 * flag

                 */

                if (long_options[match].flag == NULL)

                    optopt = long_options[match].val;

                else

                    optopt = 0;

                return BADARG;

            }

            if (long_options[match].has_arg == required_argument ||

                long_options[match].has_arg == optional_argument) {

                if (has_equal)

                    optarg = has_equal;

                else if (long_options[match].has_arg ==

                    required_argument) {

                    /*

                     * optional argument doesn't use

                     * next nargv

                     */

                    optarg = nargv[optind++];

                }

            }

            if ((long_options[match].has_arg == required_argument)

                && (optarg == NULL)) {

                /*

                 * Missing argument; leading ':'

                 * indicates no error should be generated

                 */

                if (PRINT_ERROR)

                    printf(recargstring, current_argv);

                /*

                 * XXX: GNU sets optopt to val regardless

                 * of flag

                 */

                if (long_options[match].flag == NULL)

                    optopt = long_options[match].val;

                else

                    optopt = 0;

                --optind;

                return BADARG;

            }

        } else {            /* unknown option */

            if (PRINT_ERROR)

                printf(illoptstring, current_argv);

            optopt = 0;

            return BADCH;

        }

        if (long_options[match].flag) {

            *long_options[match].flag = long_options[match].val;

            retval = 0;

        } else

            retval = long_options[match].val;

        if (idx)

            *idx = match;

    }

    return retval;

#undef IDENTICAL_INTERPRETATION

}