/*      $NetBSD: alias.c,v 1.6 2024/08/18 20:47:24 christos Exp $       */


/**
* \file alias.c
*
* Handle options that are aliases for another option.
*
* @addtogroup autoopts
* @{
*/
/*
*  This routine will forward an option alias to the correct option code.
*
*  This file is part of AutoOpts, a companion to AutoGen.
*  AutoOpts is free software.
*  AutoOpts is Copyright (C) 1992-2018 by Bruce Korb - all rights reserved
*
*  AutoOpts is available under any one of two licenses.  The license
*  in use must be one of these two and the choice is under the control
*  of the user of the license.
*
*   The GNU Lesser General Public License, version 3 or later
*      See the files "COPYING.lgplv3" and "COPYING.gplv3"
*
*   The Modified Berkeley Software Distribution License
*      See the file "COPYING.mbsd"
*
*  These files have the following sha256 sums:
*
*  8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95  COPYING.gplv3
*  4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b  COPYING.lgplv3
*  13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239  COPYING.mbsd
*/

static tSuccess
too_many_occurrences(tOptions * opts, tOptDesc * od)
{
   if ((opts->fOptSet & OPTPROC_ERRSTOP) != 0) {
       char const * eqv = (od->optEquivIndex != NO_EQUIVALENT) ? zequiv : zNil;

       fprintf(stderr, ztoo_often_fmt, opts->pzProgName);

       if (od->optMaxCt > 1)
           fprintf(stderr, zat_most, od->optMaxCt, od->pz_Name, eqv);
       else
           fprintf(stderr, zonly_one, od->pz_Name, eqv);
       (*opts->pUsageProc)(opts, EXIT_FAILURE);
       /* NOTREACHED */
   }

   return FAILURE;
}

/*=export_func  optionAlias
* private:
*
* what:  relay an option to its alias
* arg:   + tOptions *   + opts   + program options descriptor  +
* arg:   + tOptDesc *   + old_od + the descriptor for this arg +
* arg:   + unsigned int + alias  + the aliased-to option index +
* ret-type: int
*
* doc:
*  Handle one option as if it had been specified as another.  Exactly.
*  Returns "-1" if the aliased-to option has appeared too many times.
=*/
int
optionAlias(tOptions * opts, tOptDesc * old_od, unsigned int alias)
{
   tOptDesc * new_od;

   if (opts <= OPTPROC_EMIT_LIMIT)
       return 0;

   new_od = opts->pOptDesc + alias;
   if ((unsigned)opts->optCt <= alias) {
       fputs(zbad_alias_id, stderr);
       option_exits(EXIT_FAILURE);
   }

   /*
    *  Copy over the option instance flags
    */
   new_od->fOptState &= OPTST_PERSISTENT_MASK;
   new_od->fOptState |= (old_od->fOptState & ~OPTST_PERSISTENT_MASK);
   new_od->optArg.argString = old_od->optArg.argString;

   /*
    *  Keep track of count only for DEFINED (command line) options.
    *  IF we have too many, build up an error message and bail.
    */
   if (  (new_od->fOptState & OPTST_DEFINED)
      && (++new_od->optOccCt > new_od->optMaxCt)  )
       return too_many_occurrences(opts, new_od);

   /*
    *  Clear the state bits and counters
    */
   old_od->fOptState &= OPTST_PERSISTENT_MASK;
   old_od->optOccCt   = 0;

   /*
    *  If there is a procedure to call, call it
    */
   if (new_od->pOptProc != NULL)
       (*new_od->pOptProc)(opts, new_od);
   return 0;
}

/** @}
*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of autoopts/alias.c */