lib/dns/gen-win32.h

/*
 * Copyright (C) 1999-2001, 2004-2007, 2009, 2014, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/*
 * Copyright (c) 1987, 1993, 1994
 *  The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

/* $Id: gen-win32.h,v 1.25 2009/01/17 23:47:42 tbox Exp $ */

/*! \file
 * \author Principal Authors: Computer Systems Research Group at UC Berkeley
 * \author Principal ISC caretaker: DCL
 */

/*
 * \note This file was adapted from the NetBSD project's source tree, RCS ID:
 *    NetBSD: getopt.c,v 1.15 1999/09/20 04:39:37 lukem Exp
 *
 * The primary change has been to rename items to the ISC namespace
 * and format in the ISC coding style.
 *
 * This file is responsible for defining two operations that are not
 * directly portable between Unix-like systems and Windows NT, option
 * parsing and directory scanning.  It is here because it was decided
 * that the "gen" build utility was not to depend on libisc.a, so
 * the functions declared in isc/commandline.h and isc/dir.h could not
 * be used.
 *
 * The commandline stuff is pretty much a straight copy from the initial
 * isc/commandline.c.  The dir stuff was shrunk to fit the needs of gen.c.
 */

#ifndef DNS_GEN_WIN32_H
#define DNS_GEN_WIN32_H 1

#include <stdio.h>
#include <string.h>
#include <windows.h>

#include <isc/boolean.h>
#include <isc/lang.h>

int isc_commandline_index = 1;      /* Index into parent argv vector. */
int isc_commandline_option;     /* Character checked for validity. */

char *isc_commandline_argument;     /* Argument associated with option. */
char *isc_commandline_progname;     /* For printing error messages. */

isc_boolean_t isc_commandline_errprint = ISC_TRUE; /* Print error messages. */
isc_boolean_t isc_commandline_reset = ISC_TRUE; /* Reset processing. */

#define BADOPT  '?'
#define BADARG  ':'
#define ENDOPT  ""

ISC_LANG_BEGINDECLS

/*
 * getopt --
 *  Parse argc/argv argument vector.
 */
int
isc_commandline_parse(int argc, char * const *argv, const char *options) {
    static char *place = ENDOPT;
    char *option;           /* Index into *options of option. */

    /*
     * Update scanning pointer, either because a reset was requested or
     * the previous argv was finished.
     */
    if (isc_commandline_reset || *place == '\0') {
        isc_commandline_reset = ISC_FALSE;

        if (isc_commandline_progname == NULL)
            isc_commandline_progname = argv[0];

        if (isc_commandline_index >= argc ||
            *(place = argv[isc_commandline_index]) != '-') {
            /*
             * Index out of range or points to non-option.
             */
            place = ENDOPT;
            return (-1);
        }

        if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
            /*
             * Found '--' to signal end of options.  Advance
             * index to next argv, the first non-option.
             */
            isc_commandline_index++;
            place = ENDOPT;
            return (-1);
        }
    }

    isc_commandline_option = *place++;
    option = strchr(options, isc_commandline_option);

    /*
     * Ensure valid option has been passed as specified by options string.
     * '-:' is never a valid command line option because it could not
     * distinguish ':' from the argument specifier in the options string.
     */
    if (isc_commandline_option == ':' || option == NULL) {
        if (*place == '\0')
            isc_commandline_index++;

        if (isc_commandline_errprint && *options != ':')
            fprintf(stderr, "%s: illegal option -- %c\n",
                isc_commandline_progname,
                isc_commandline_option);

        return (BADOPT);
    }

    if (*++option != ':') {
        /*
         * Option does not take an argument.
         */
        isc_commandline_argument = NULL;

        /*
         * Skip to next argv if at the end of the current argv.
         */
        if (*place == '\0')
            ++isc_commandline_index;

    } else {
        /*
         * Option needs an argument.
         */
        if (*place != '\0')
            /*
             * Option is in this argv, -D1 style.
             */
            isc_commandline_argument = place;

        else if (argc > ++isc_commandline_index)
            /*
             * Option is next argv, -D 1 style.
             */
            isc_commandline_argument = argv[isc_commandline_index];

        else {
            /*
             * Argument needed, but no more argv.
             */
            place = ENDOPT;

            /*
             * Silent failure with "missing argument" return
             * when ':' starts options string, per historical spec.
             */
            if (*options == ':')
                return (BADARG);

            if (isc_commandline_errprint)
                fprintf(stderr,
                    "%s: option requires an argument -- %c\n",
                    isc_commandline_progname,
                    isc_commandline_option);

            return (BADOPT);
        }

        place = ENDOPT;

        /*
         * Point to argv that follows argument.
         */
        isc_commandline_index++;
    }

    return (isc_commandline_option);
}

typedef struct {
    HANDLE handle;
    WIN32_FIND_DATA find_data;
    isc_boolean_t first_file;
    char *filename;
} isc_dir_t;

isc_boolean_t
start_directory(const char *path, isc_dir_t *dir) {
    char pattern[_MAX_PATH], *p;

    /*
     * Need space for slash-splat and final NUL.
     */
    if (strlen(path) + 3 > sizeof(pattern))
        return (ISC_FALSE);

    strcpy(pattern, path);

    /*
     * Append slash (if needed) and splat.
     */
    p = pattern + strlen(pattern);
    if (p != pattern  && p[-1] != '\\' && p[-1] != ':')
        *p++ = '\\';
    *p++ = '*';
    *p++ = '\0';

    dir->first_file = ISC_TRUE;

    dir->handle = FindFirstFile(pattern, &dir->find_data);

    if (dir->handle == INVALID_HANDLE_VALUE) {
        dir->filename = NULL;
        return (ISC_FALSE);
    } else {
        dir->filename = dir->find_data.cFileName;
        return (ISC_TRUE);
    }
}

isc_boolean_t
next_file(isc_dir_t *dir) {
    if (dir->first_file)
        dir->first_file = ISC_FALSE;

    else if (dir->handle != INVALID_HANDLE_VALUE) {
        if (FindNextFile(dir->handle, &dir->find_data) == TRUE)
            dir->filename = dir->find_data.cFileName;
        else
            dir->filename = NULL;

    } else
        dir->filename = NULL;

    if (dir->filename != NULL)
        return (ISC_TRUE);
    else
        return (ISC_FALSE);
}

void
end_directory(isc_dir_t *dir) {
    if (dir->handle != INVALID_HANDLE_VALUE)
        FindClose(dir->handle);
}

ISC_LANG_ENDDECLS

#endif /* DNS_GEN_WIN32_H */