boolean.c

Linux下利用NTP协议的网络时间同步客户端

/*
 *  $Id: boolean.c,v 4.10 2007/02/04 17:44:12 bkorb Exp $
 * Time-stamp:      "2007-01-13 10:10:39 bkorb"
 *
 *   Automated Options Paged Usage module.
 *
 *  This routine will run run-on options through a pager so the
 *  user may examine, print or edit them at their leisure.
 */

/*
 *  Automated Options copyright 1992-2007 Bruce Korb
 *
 *  Automated Options is free software.
 *  You may redistribute it and/or modify it under the terms of the
 *  GNU General Public License, as published by the Free Software
 *  Foundation; either version 2, or (at your option) any later version.
 *
 *  Automated Options is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Automated Options.  See the file "COPYING".  If not,
 *  write to:  The Free Software Foundation, Inc.,
 *             51 Franklin Street, Fifth Floor,
 *             Boston, MA  02110-1301, USA.
 *
 * As a special exception, Bruce Korb gives permission for additional
 * uses of the text contained in his release of AutoOpts.
 *
 * The exception is that, if you link the AutoOpts library with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the AutoOpts library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by Bruce Korb under
 * the name AutoOpts.  If you copy code from other sources under the
 * General Public License into a copy of AutoOpts, as the General Public
 * License permits, the exception does not apply to the code that you add
 * in this way.  To avoid misleading anyone as to the status of such
 * modified files, you must delete this exception notice from them.
 *
 * If you write modifications of your own for AutoOpts, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 */

/*=export_func  optionBooleanVal
 * private:
 *
 * what:  Decipher a boolean value
 * arg:   + tOptions* + pOpts    + program options descriptor +
 * arg:   + tOptDesc* + pOptDesc + the descriptor for this arg +
 *
 * doc:
 *  Decipher a true or false value for a boolean valued option argument.
 *  The value is true, unless it starts with 'n' or 'f' or "#f" or
 *  it is an empty string or it is a number that evaluates to zero.
=*/
void
optionBooleanVal( tOptions* pOpts, tOptDesc* pOD )
{
    char* pz;
    ag_bool  res = AG_TRUE;

    switch (*(pOD->optArg.argString)) {
    case '0':
    {
        long  val = strtol( pOD->optArg.argString, &pz, 0 );
        if ((val != 0) || (*pz != NUL))
            break;
        /* FALLTHROUGH */
    }
    case 'N':
    case 'n':
    case 'F':
    case 'f':
    case NUL:
        res = AG_FALSE;
        break;
    case '#':
        if (pOD->optArg.argString[1] != 'f')
            break;
        res = AG_FALSE;
    }

    if (pOD->fOptState & OPTST_ALLOC_ARG) {
        AGFREE(pOD->optArg.argString);
        pOD->fOptState &= ~OPTST_ALLOC_ARG;
    }
    pOD->optArg.argBool = res;
}
/*
 * Local Variables:
 * mode: C
 * c-file-style: "stroustrup"
 * indent-tabs-mode: nil
 * End:
 * end of autoopts/boolean.c */