/**

 * \file autoopts.c

 *

 *  This file contains all of the routines that must be linked into

 *  an executable to use the generated option processing.  The optional

 *  routines are in separately compiled modules so that they will not

 *  necessarily be linked in.

 *

 * @addtogroup autoopts

 * @{

 */

/*

 *  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

 */

/**

 * The number of tab characters to skip when printing continuation lines.

 */

  static unsigned int tab_skip_ct          = 0;

#ifndef HAVE_PATHFIND

#  define  pathfind(_p, _n, _m) option_pathfind(_p, _n, _m)

#  include "compat/pathfind.c"

#endif

#ifndef HAVE_SNPRINTF

#  define vsnprintf       option_vsnprintf

#  define snprintf        option_snprintf

#  include "compat/snprintf.c"

#endif

#ifndef HAVE_STRDUP

#  define  strdup(_s)     option_strdup(_s)

#  include "compat/strdup.c"

#endif

#ifndef HAVE_STRCHR

#  define strrchr(_s, _c) option_strrchr(_s, _c)

#  define strchr(_s, _c)  option_strchr(_s, _c)

#  include "compat/strchr.c"

#endif

static void *

ao_malloc(size_t sz)

{

    void * res = malloc(sz);

    if (res == NULL) {

        fprintf(stderr, zalloc_fail, (int)sz);

        option_exits(EXIT_FAILURE);

    }

    return res;

}

static void *

ao_realloc(void *p, size_t sz)

{

    void * res = (p == NULL) ? malloc(sz) : realloc(p, sz);

    if (res == NULL) {

        fprintf(stderr, zrealloc_fail, (int)sz, p);

        option_exits(EXIT_FAILURE);

    }

    return res;

}

static char *

ao_strdup(char const *str)

{

    char * res = strdup(str);

    if (res == NULL) {

        fprintf(stderr, zalloc_fail, (int)strlen(str));

        option_exits(EXIT_FAILURE);

    }

    return res;

}

/**

 *  handle an option.

 *

 *  This routine handles equivalencing, sets the option state flags and

 *  invokes the handler procedure, if any.

 */

static tSuccess

handle_opt(tOptions * opts, tOptState * o_st)

{

    /*

     *  Save a copy of the option procedure pointer.

     *  If this is an equivalence class option, we still want this proc.

     */

    tOptDesc *  od = o_st->pOD;

    tOptProc *  opt_proc = od->pOptProc;

    if (od->fOptState & OPTST_ALLOC_ARG)

        AGFREE(od->optArg.argString);

    od->optArg.argString = o_st->pzOptArg;

    /*

     *  IF we are presetting options, then we will ignore any un-presettable

     *  options.  They are the ones either marked as such.

     */

    if (  ((opts->fOptSet & OPTPROC_PRESETTING) != 0)

       && ((od->fOptState & OPTST_NO_INIT) != 0)

       )

        return PROBLEM;

    /*

     *  IF this is an equivalence class option,

     *  THEN

     *      Save the option value that got us to this option

     *      entry.  (It may not be od->optChar[0], if this is an

     *      equivalence entry.)

     *      set the pointer to the equivalence class base

     */

    if (od->optEquivIndex != NO_EQUIVALENT) {

        tOptDesc * eqv_od = opts->pOptDesc + od->optEquivIndex;

        /*

         * IF the current option state has not been defined (set on the

         *    command line), THEN we will allow continued resetting of

         *    the value.  Once "defined", then it must not change.

         */

        if ((od->fOptState & OPTST_DEFINED) != 0) {

            /*

             *  The equivalenced-to option has been found on the command

             *  line before.  Make sure new occurrences are the same type.

             *

             *  IF this option has been previously equivalenced and

             *     it was not the same equivalenced-to option,

             *  THEN we have a usage problem.

             */

            if (eqv_od->optActualIndex != od->optIndex) {

                fprintf(stderr, zmultiway_bug, eqv_od->pz_Name, od->pz_Name,

                        (opts->pOptDesc + eqv_od->optActualIndex)->pz_Name);

                return FAILURE;

            }

        } else {

            /*

             *  Set the equivalenced-to actual option index to no-equivalent

             *  so that we set all the entries below.  This option may either

             *  never have been selected before, or else it was selected by

             *  some sort of "presetting" mechanism.

             */

            eqv_od->optActualIndex = NO_EQUIVALENT;

        }

        if (eqv_od->optActualIndex != od->optIndex) {

            /*

             *  First time through, copy over the state

             *  and add in the equivalence flag

             */

            eqv_od->optActualValue = od->optValue;

            eqv_od->optActualIndex = od->optIndex;

            o_st->flags |= OPTST_EQUIVALENCE;

        }

        /*

         *  Copy the most recent option argument.  set membership state

         *  is kept in 'eqv_od->optCookie'.  Do not overwrite.

         */

        eqv_od->optArg.argString = od->optArg.argString;

        od = eqv_od;

    } else {

        od->optActualValue = od->optValue;

        od->optActualIndex = od->optIndex;

    }

    od->fOptState &= OPTST_PERSISTENT_MASK;

    od->fOptState |= (o_st->flags & ~OPTST_PERSISTENT_MASK);

    /*

     *  Keep track of count only for DEFINED (command line) options.

     *  IF we have too many, build up an error message and bail.

     */

    if (  (od->fOptState & OPTST_DEFINED)

       && (++od->optOccCt > od->optMaxCt)  )

        return too_many_occurrences(opts, od);

    /*

     *  If provided a procedure to call, call it

     */

    if (opt_proc != NULL)

        (*opt_proc)(opts, od);

    return SUCCESS;

}

/**

 *  Find the option descriptor and option argument (if any) for the

 *  next command line argument.  DO NOT modify the descriptor.  Put

 *  all the state in the state argument so that the option can be skipped

 *  without consequence (side effect).

 *

 * @param opts the program option descriptor

 * @param o_st  the state of the next found option

 */

static tSuccess

next_opt(tOptions * opts, tOptState * o_st)

{

    {

        tSuccess res = find_opt(opts, o_st);

        if (! SUCCESSFUL(res))

            return res;

    }

    if (  ((o_st->flags & OPTST_DEFINED) != 0)

       && ((o_st->pOD->fOptState & OPTST_NO_COMMAND) != 0)) {

        fprintf(stderr, zNotCmdOpt, o_st->pOD->pz_Name);

        return FAILURE;

    }

    return get_opt_arg(opts, o_st);

}

/**

 * Process all the options from our current position onward.  (This allows

 * interspersed options and arguments for the few non-standard programs that

 * require it.)  Thus, do not rewind option indexes because some programs

 * choose to re-invoke after a non-option.

 *

 *  @param[in,out] opts   program options descriptor

 *  @returns SUCCESS or FAILURE

 */

static tSuccess

regular_opts(tOptions * opts)

{

    /* assert:  opts->fOptSet & OPTPROC_IMMEDIATE == 0 */

    for (;;) {

        tOptState opt_st = OPTSTATE_INITIALIZER(DEFINED);

        switch (next_opt(opts, &opt_st)) {

        case FAILURE: goto   failed_option;

        case PROBLEM: return SUCCESS; /* no more args */

        case SUCCESS: break;

        }

        /*

         *  IF this is an immediate action option,

         *  THEN skip it (unless we are supposed to do it a second time).

         */

        if (! DO_NORMALLY(opt_st.flags)) {

            if (! DO_SECOND_TIME(opt_st.flags))

                continue;

            opt_st.pOD->optOccCt--; /* don't count this repetition */

        }

        if (! SUCCESSFUL(handle_opt(opts, &opt_st)))

            break;

    } failed_option:;

    if ((opts->fOptSet & OPTPROC_ERRSTOP) != 0)

        (*opts->pUsageProc)(opts, EXIT_FAILURE);

    return FAILURE;

}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 *

 *  THESE ROUTINES ARE CALLABLE FROM THE GENERATED OPTION PROCESSING CODE

 */

/*=--subblock=arg=arg_type,arg_name,arg_desc =*/

/*=*

 * library:  opts

 * header:   your-opts.h

 *

 * lib_description:

 *

 *  These are the routines that libopts users may call directly from their

 *  code.  There are several other routines that can be called by code

 *  generated by the libopts option templates, but they are not to be

 *  called from any other user code.  The @file{options.h} header is

 *  fairly clear about this, too.

=*/

/*=export_func optionProcess

 *

 * what: this is the main option processing routine

 *

 * arg:  + tOptions * + opts  + program options descriptor +

 * arg:  + int        + a_ct  + program arg count  +

 * arg:  + char **    + a_v   + program arg vector +

 *

 * ret_type:  int

 * ret_desc:  the count of the arguments processed

 *

 * doc:

 *

 * This is the main entry point for processing options.  It is intended

 * that this procedure be called once at the beginning of the execution of

 * a program.  Depending on options selected earlier, it is sometimes

 * necessary to stop and restart option processing, or to select completely

 * different sets of options.  This can be done easily, but you generally

 * do not want to do this.

 *

 * The number of arguments processed always includes the program name.

 * If one of the arguments is "--", then it is counted and the processing

 * stops.  If an error was encountered and errors are to be tolerated, then

 * the returned value is the index of the argument causing the error.

 * A hyphen by itself ("-") will also cause processing to stop and will

 * @emph{not} be counted among the processed arguments.  A hyphen by itself

 * is treated as an operand.  Encountering an operand stops option

 * processing.

 *

 * err:  Errors will cause diagnostics to be printed.  @code{exit(3)} may

 *       or may not be called.  It depends upon whether or not the options

 *       were generated with the "allow-errors" attribute, or if the

 *       ERRSKIP_OPTERR or ERRSTOP_OPTERR macros were invoked.

=*/

int

optionProcess(tOptions * opts, int a_ct, char ** a_v)

{

    if (! SUCCESSFUL(validate_struct(opts, a_v[0])))

        ao_bug(zbad_data_msg);

    /*

     *  Establish the real program name, the program full path,

     *  and do all the presetting the first time thru only.

     */

    if (! ao_initialize(opts, a_ct, a_v))

        return 0;

    /*

     *  IF we are (re)starting,

     *  THEN reset option location

     */

    if (opts->curOptIdx <= 0) {

        opts->curOptIdx = 1;

        opts->pzCurOpt  = NULL;

    }

    if (! SUCCESSFUL(regular_opts(opts)))

        return (int)opts->origArgCt;

    /*

     *  IF    there were no errors

     *    AND we have RC/INI files

     *    AND there is a request to save the files

     *  THEN do that now before testing for conflicts.

     *       (conflicts are ignored in preset options)

     */

    switch (opts->specOptIdx.save_opts) {

    case 0:

    case NO_EQUIVALENT:

        break;

    default:

    {

        tOptDesc * od = opts->pOptDesc + opts->specOptIdx.save_opts;

        if (SELECTED_OPT(od)) {

            optionSaveFile(opts);

            option_exits(EXIT_SUCCESS);

        }

    }

    }

    /*

     *  IF we are checking for errors,

     *  THEN look for too few occurrences of required options

     */

    if (((opts->fOptSet & OPTPROC_ERRSTOP) != 0)

       && (! is_consistent(opts)))

        (*opts->pUsageProc)(opts, EXIT_FAILURE);

    return (int)opts->curOptIdx;

}

/** @}

 *

 * Local Variables:

 * mode: C

 * c-file-style: "stroustrup"

 * indent-tabs-mode: nil

 * End:

 * end of autoopts/autoopts.c */