/* [argparse.c wk 17.06.97] Argument Parser for option handling

 * Copyright (C) 1998-2001, 2006-2008, 2012 Free Software Foundation, Inc.

 * Copyright (C) 1997-2001, 2006-2008, 2013-2015 Werner Koch

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify it

 * under the terms of either

 *

 *   - the GNU Lesser General Public License as published by the Free

 *     Software Foundation; either version 3 of the License, or (at

 *     your option) any later version.

 *

 * or

 *

 *   - the GNU General Public License as published by the Free

 *     Software Foundation; either version 2 of the License, or (at

 *     your option) any later version.

 *

 * or both in parallel, as here.

 *

 * GnuPG 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 copies of the GNU General Public License

 * and the GNU Lesser General Public License along with this program;

 * if not, see <https://www.gnu.org/licenses/>.

 */

/* This file may be used as part of GnuPG or standalone.  A GnuPG

   build is detected by the presence of the macro GNUPG_MAJOR_VERSION.

   Some feature are only availalbe in the GnuPG build mode.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <string.h>

#include <stdarg.h>

#include <limits.h>

#include <errno.h>

#ifdef GNUPG_MAJOR_VERSION

# include "util.h"

# include "common-defs.h"

# include "i18n.h"

# include "mischelp.h"

# include "stringhelp.h"

# include "logging.h"

# include "utf8conv.h"

#endif /*GNUPG_MAJOR_VERSION*/

#include "argparse.h"

/* GnuPG uses GPLv3+ but a standalone version of this defaults to

   GPLv2+ because that is the license of this file.  Change this if

   you include it in a program which uses GPLv3.  If you don't want to

   set a a copyright string for your usage() you may also hardcode it

   here.  */

#ifndef GNUPG_MAJOR_VERSION

# define ARGPARSE_GPL_VERSION      2

# define ARGPARSE_CRIGHT_STR "Copyright (C) YEAR NAME"

#else /* Used by GnuPG  */

# define ARGPARSE_GPL_VERSION      3

# define ARGPARSE_CRIGHT_STR "Copyright (C) 2015 Free Software Foundation, Inc."

#endif /*GNUPG_MAJOR_VERSION*/

/* Replacements for standalone builds.  */

#ifndef GNUPG_MAJOR_VERSION

# ifndef _

#  define _(a)  (a)

# endif

# ifndef DIM

#  define DIM(v)           (sizeof(v)/sizeof((v)[0]))

# endif

# define xtrymalloc(a)    malloc ((a))

# define xtryrealloc(a,b) realloc ((a), (b))

# define xtrystrdup(a)    strdup ((a))

# define xfree(a)         free ((a))

# define log_error        my_log_error

# define log_bug	  my_log_bug

# define trim_spaces(a)   my_trim_spaces ((a))

# define map_static_macro_string(a)  (a)

#endif /*!GNUPG_MAJOR_VERSION*/

#define ARGPARSE_STR(v) #v

#define ARGPARSE_STR2(v) ARGPARSE_STR(v)

/* Replacements for standalone builds.  */

#ifndef GNUPG_MAJOR_VERSION

static void

my_log_error (const char *fmt, ...)

{

  va_list arg_ptr ;

  va_start (arg_ptr, fmt);

  fprintf (stderr, "%s: ", strusage (11));

  vfprintf (stderr, fmt, arg_ptr);

  va_end (arg_ptr);

}

static void

my_log_bug (const char *fmt, ...)

{

  va_list arg_ptr ;

  va_start (arg_ptr, fmt);

  fprintf (stderr, "%s: Ohhhh jeeee: ", strusage (11));

  vfprintf (stderr, fmt, arg_ptr);

  va_end (arg_ptr);

  abort ();

}

/* Return true if the native charset is utf-8.  */

static int

is_native_utf8 (void)

{

  return 1;

}

static char *

my_trim_spaces (char *str)

{

  char *string, *p, *mark;

  string = str;

  /* Find first non space character. */

  for (p=string; *p && isspace (*(unsigned char*)p) ; p++)

    ;

  /* Move characters. */

  for ((mark = NULL); (*string = *p); string++, p++)

    if (isspace (*(unsigned char*)p))

      {

        if (!mark)

          mark = string;

      }

    else

      mark = NULL;

  if (mark)

    *mark = '\0' ;  /* Remove trailing spaces. */

  return str ;

}

#endif /*!GNUPG_MAJOR_VERSION*/

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

 * @Summary arg_parse

 *  #include "argparse.h"

 *

 *  typedef struct {

 *	char *argc;		  pointer to argc (value subject to change)

 *	char ***argv;		  pointer to argv (value subject to change)

 *	unsigned flags; 	  Global flags (DO NOT CHANGE)

 *	int err;		  print error about last option

 *				  1 = warning, 2 = abort

 *	int r_opt;		  return option

 *	int r_type;		  type of return value (0 = no argument found)

 *	union {

 *	    int   ret_int;

 *	    long  ret_long

 *	    ulong ret_ulong;

 *	    char *ret_str;

 *	} r;			  Return values

 *	struct {

 *	    int idx;

 *	    const char *last;

 *	    void *aliases;

 *	} internal;		  DO NOT CHANGE

 *  } ARGPARSE_ARGS;

 *

 *  typedef struct {

 *	int	    short_opt;

 *	const char *long_opt;

 *	unsigned flags;

 *  } ARGPARSE_OPTS;

 *

 *  int arg_parse( ARGPARSE_ARGS *arg, ARGPARSE_OPTS *opts );

 *

 * @Description

 *  This is my replacement for getopt(). See the example for a typical usage.

 *  Global flags are:

 *     Bit 0 : Do not remove options form argv

 *     Bit 1 : Do not stop at last option but return other args

 *	       with r_opt set to -1.

 *     Bit 2 : Assume options and real args are mixed.

 *     Bit 3 : Do not use -- to stop option processing.

 *     Bit 4 : Do not skip the first arg.

 *     Bit 5 : allow usage of long option with only one dash

 *     Bit 6 : ignore --version

 *     all other bits must be set to zero, this value is modified by the

 *     function, so assume this is write only.

 *  Local flags (for each option):

 *     Bit 2-0 : 0 = does not take an argument

 *		 1 = takes int argument

 *		 2 = takes string argument

 *		 3 = takes long argument

 *		 4 = takes ulong argument

 *     Bit 3 : argument is optional (r_type will the be set to 0)

 *     Bit 4 : allow 0x etc. prefixed values.

 *     Bit 6 : Ignore this option

 *     Bit 7 : This is a command and not an option

 *  You stop the option processing by setting opts to NULL, the function will

 *  then return 0.

 * @Return Value

 *   Returns the args.r_opt or 0 if ready

 *   r_opt may be -2/-7 to indicate an unknown option/command.

 * @See Also

 *   ArgExpand

 * @Notes

 *  You do not need to process the options 'h', '--help' or '--version'

 *  because this function includes standard help processing; but if you

 *  specify '-h', '--help' or '--version' you have to do it yourself.

 *  The option '--' stops argument processing; if bit 1 is set the function

 *  continues to return normal arguments.

 *  To process float args or unsigned args you must use a string args and do

 *  the conversion yourself.

 * @Example

 *

 *     ARGPARSE_OPTS opts[] = {

 *     { 'v', "verbose",   0 },

 *     { 'd', "debug",     0 },

 *     { 'o', "output",    2 },

 *     { 'c', "cross-ref", 2|8 },

 *     { 'm', "my-option", 1|8 },

 *     { 300, "ignored-long-option, ARGPARSE_OP_IGNORE},

 *     { 500, "have-no-short-option-for-this-long-option", 0 },

 *     {0} };

 *     ARGPARSE_ARGS pargs = { &argc, &argv, 0 }

 *

 *     while( ArgParse( &pargs, &opts) ) {

 *	   switch( pargs.r_opt ) {

 *	     case 'v': opt.verbose++; break;

 *	     case 'd': opt.debug++; break;

 *	     case 'o': opt.outfile = pargs.r.ret_str; break;

 *	     case 'c': opt.crf = pargs.r_type? pargs.r.ret_str:"a.crf"; break;

 *	     case 'm': opt.myopt = pargs.r_type? pargs.r.ret_int : 1; break;

 *	     case 500: opt.a_long_one++;  break

 *	     default : pargs.err = 1; break; -- force warning output --

 *	   }

 *     }

 *     if( argc > 1 )

 *	   log_fatal( "Too many args");

 *

 */

typedef struct alias_def_s *ALIAS_DEF;

struct alias_def_s {

    ALIAS_DEF next;

    char *name;   /* malloced buffer with name, \0, value */

    const char *value; /* ptr into name */

};

/* Object to store the names for the --ignore-invalid-option option.

   This is a simple linked list.  */

typedef struct iio_item_def_s *IIO_ITEM_DEF;

struct iio_item_def_s

{

  IIO_ITEM_DEF next;

  char name[1];      /* String with the long option name.  */

};

static const char *(*strusage_handler)( int ) = NULL;

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

static int  set_opt_arg(ARGPARSE_ARGS *arg, unsigned flags, char *s);

static void show_help(ARGPARSE_OPTS *opts, unsigned flags);

static void show_version(void);

static int writestrings (int is_error, const char *string, ...)

#if __GNUC__ >= 4

  __attribute__ ((sentinel(0)))

#endif

  ;

void

argparse_register_outfnc (int (*fnc)(int, const char *))

{

  custom_outfnc = fnc;

}

/* Write STRING and all following const char * arguments either to

   stdout or, if IS_ERROR is set, to stderr.  The list of strings must

   be terminated by a NULL.  */

static int

writestrings (int is_error, const char *string, ...)

{

  va_list arg_ptr;

  const char *s;

  int count = 0;

  if (string)

    {

      s = string;

      va_start (arg_ptr, string);

      do

        {

          if (custom_outfnc)

            custom_outfnc (is_error? 2:1, s);

          else

            fputs (s, is_error? stderr : stdout);

          count += strlen (s);

        }

      while ((s = va_arg (arg_ptr, const char *)));

      va_end (arg_ptr);

    }

  return count;

}

static void

flushstrings (int is_error)

{

  if (custom_outfnc)

    custom_outfnc (is_error? 2:1, NULL);

  else

    fflush (is_error? stderr : stdout);

}

static void

initialize( ARGPARSE_ARGS *arg, const char *filename, unsigned *lineno )

{

  if( !(arg->flags & (1<<15)) )

    {

      /* Initialize this instance. */

      arg->internal.idx = 0;

      arg->internal.last = NULL;

      arg->internal.inarg = 0;

      arg->internal.stopped = 0;

      arg->internal.aliases = NULL;

      arg->internal.cur_alias = NULL;

      arg->internal.iio_list = NULL;

      arg->err = 0;

      arg->flags |= 1<<15; /* Mark as initialized.  */

      if ( *arg->argc < 0 )

        log_bug ("invalid argument for arg_parse\n");

    }

  if (arg->err)

    {

      /* Last option was erroneous.  */

      const char *s;

      if (filename)

        {

          if ( arg->r_opt == ARGPARSE_UNEXPECTED_ARG )

            s = _("argument not expected");

          else if ( arg->r_opt == ARGPARSE_READ_ERROR )

            s = _("read error");

          else if ( arg->r_opt == ARGPARSE_KEYWORD_TOO_LONG )

            s = _("keyword too long");

          else if ( arg->r_opt == ARGPARSE_MISSING_ARG )

            s = _("missing argument");

          else if ( arg->r_opt == ARGPARSE_INVALID_ARG )

            s = _("invalid argument");

          else if ( arg->r_opt == ARGPARSE_INVALID_COMMAND )

            s = _("invalid command");

          else if ( arg->r_opt == ARGPARSE_INVALID_ALIAS )

            s = _("invalid alias definition");

          else if ( arg->r_opt == ARGPARSE_OUT_OF_CORE )

            s = _("out of core");

          else

            s = _("invalid option");

          log_error ("%s:%u: %s\n", filename, *lineno, s);

	}

      else

        {

          s = arg->internal.last? arg->internal.last:"[??]";

          if ( arg->r_opt == ARGPARSE_MISSING_ARG )

            log_error (_("missing argument for option \"%.50s\"\n"), s);

          else if ( arg->r_opt == ARGPARSE_INVALID_ARG )

            log_error (_("invalid argument for option \"%.50s\"\n"), s);

          else if ( arg->r_opt == ARGPARSE_UNEXPECTED_ARG )

            log_error (_("option \"%.50s\" does not expect an argument\n"), s);

          else if ( arg->r_opt == ARGPARSE_INVALID_COMMAND )

            log_error (_("invalid command \"%.50s\"\n"), s);

          else if ( arg->r_opt == ARGPARSE_AMBIGUOUS_OPTION )

            log_error (_("option \"%.50s\" is ambiguous\n"), s);

          else if ( arg->r_opt == ARGPARSE_AMBIGUOUS_COMMAND )

            log_error (_("command \"%.50s\" is ambiguous\n"),s );

          else if ( arg->r_opt == ARGPARSE_OUT_OF_CORE )

            log_error ("%s\n", _("out of core\n"));

          else

            log_error (_("invalid option \"%.50s\"\n"), s);

	}

      if (arg->err != ARGPARSE_PRINT_WARNING)

        exit (2);

      arg->err = 0;

    }

  /* Zero out the return value union.  */

  arg->r.ret_str = NULL;

  arg->r.ret_long = 0;

}

static void

store_alias( ARGPARSE_ARGS *arg, char *name, char *value )

{

    /* TODO: replace this dummy function with a rea one

     * and fix the probelms IRIX has with (ALIAS_DEV)arg..

     * used as lvalue

     */

  (void)arg;

  (void)name;

  (void)value;

#if 0

    ALIAS_DEF a = xmalloc( sizeof *a );

    a->name = name;

    a->value = value;

    a->next = (ALIAS_DEF)arg->internal.aliases;

    (ALIAS_DEF)arg->internal.aliases = a;

#endif

}

/* Return true if KEYWORD is in the ignore-invalid-option list.  */

static int

ignore_invalid_option_p (ARGPARSE_ARGS *arg, const char *keyword)

{

  IIO_ITEM_DEF item = arg->internal.iio_list;

  for (; item; item = item->next)

    if (!strcmp (item->name, keyword))

      return 1;

  return 0;

}

/* Add the keywords up to the next LF to the list of to be ignored

   options.  After returning FP will either be at EOF or the next

   character read wll be the first of a new line.  The function

   returns 0 on success or true on malloc failure.  */

static int

ignore_invalid_option_add (ARGPARSE_ARGS *arg, FILE *fp)

{

  IIO_ITEM_DEF item;

  int c;

  char name[100];

  int namelen = 0;

  int ready = 0;

  enum { skipWS, collectNAME, skipNAME, addNAME} state = skipWS;

  while (!ready)

    {

      c = getc (fp);

      if (c == '\n')

        ready = 1;

      else if (c == EOF)

        {

          c = '\n';

          ready = 1;

        }

    again:

      switch (state)

        {

        case skipWS:

          if (!isascii (c) || !isspace(c))

            {

              namelen = 0;

              state = collectNAME;

              goto again;

            }

          break;

        case collectNAME:

          if (isspace (c))

            {

              state = addNAME;

              goto again;

            }

          else if (namelen < DIM(name)-1)

            name[namelen++] = c;

          else /* Too long.  */

            state = skipNAME;

          break;

        case skipNAME:

          if (isspace (c))

            {

              state = skipWS;

              goto again;

            }

          break;

        case addNAME:

          name[namelen] = 0;

          if (!ignore_invalid_option_p (arg, name))

            {

              item = xtrymalloc (sizeof *item + namelen);

              if (!item)

                return 1;

              strcpy (item->name, name);

              item->next = (IIO_ITEM_DEF)arg->internal.iio_list;

              arg->internal.iio_list = item;

            }

          state = skipWS;

          goto again;

        }

    }

  return 0;

}

/* Clear the entire ignore-invalid-option list.  */

static void

ignore_invalid_option_clear (ARGPARSE_ARGS *arg)

{

  IIO_ITEM_DEF item, tmpitem;

  for (item = arg->internal.iio_list; item; item = tmpitem)

    {

      tmpitem = item->next;

      xfree (item);

    }

  arg->internal.iio_list = NULL;

}

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

 * Get options from a file.

 * Lines starting with '#' are comment lines.

 * Syntax is simply a keyword and the argument.

 * Valid keywords are all keywords from the long_opt list without

 * the leading dashes. The special keywords "help", "warranty" and "version"

 * are not valid here.

 * The special keyword "alias" may be used to store alias definitions,

 * which are later expanded like long options.

 * The option

 *   ignore-invalid-option OPTIONNAMEs

 * is recognized and updates a list of option which should be ignored if they

 * are not defined.

 * Caller must free returned strings.

 * If called with FP set to NULL command line args are parse instead.

 *

 * Q: Should we allow the syntax

 *     keyword = value

 *    and accept for boolean options a value of 1/0, yes/no or true/false?

 * Note: Abbreviation of options is here not allowed.

 */

int

optfile_parse (FILE *fp, const char *filename, unsigned *lineno,

	       ARGPARSE_ARGS *arg, ARGPARSE_OPTS *opts)

{

  int state, i, c;

  int idx=0;

  char keyword[100];

  char *buffer = NULL;

  size_t buflen = 0;

  int in_alias=0;

  if (!fp) /* Divert to to arg_parse() in this case.  */

    return arg_parse (arg, opts);

  initialize (arg, filename, lineno);

  /* Find the next keyword.  */

  state = i = 0;

  for (;;)

    {

      c = getc (fp);

      if (c == '\n' || c== EOF )

        {

          if ( c != EOF )

            ++*lineno;

          if (state == -1)

            break;

          else if (state == 2)

            {

              keyword[i] = 0;

              for (i=0; opts[i].short_opt; i++ )

                {

                  if (opts[i].long_opt && !strcmp (opts[i].long_opt, keyword))

                    break;

                }

              idx = i;

              arg->r_opt = opts[idx].short_opt;

              if ((opts[idx].flags & ARGPARSE_OPT_IGNORE))

                {

                  state = i = 0;

                  continue;

                }

              else if (!opts[idx].short_opt )

                {

                  if (!strcmp (keyword, "ignore-invalid-option"))

                    {

                      /* No argument - ignore this meta option.  */

                      state = i = 0;

                      continue;

                    }

                  else if (ignore_invalid_option_p (arg, keyword))

                    {

                      /* This invalid option is in the iio list.  */

                      state = i = 0;

                      continue;

                    }

                  arg->r_opt = ((opts[idx].flags & ARGPARSE_OPT_COMMAND)

                                ? ARGPARSE_INVALID_COMMAND

                                : ARGPARSE_INVALID_OPTION);

                }

              else if (!(opts[idx].flags & ARGPARSE_TYPE_MASK))

                arg->r_type = 0; /* Does not take an arg. */

              else if ((opts[idx].flags & ARGPARSE_OPT_OPTIONAL) )

                arg->r_type = 0; /* Arg is optional.  */

              else

                arg->r_opt = ARGPARSE_MISSING_ARG;

              break;

	    }

          else if (state == 3)

            {

              /* No argument found.  */

              if (in_alias)

                arg->r_opt = ARGPARSE_MISSING_ARG;

              else if (!(opts[idx].flags & ARGPARSE_TYPE_MASK))

                arg->r_type = 0; /* Does not take an arg. */

              else if ((opts[idx].flags & ARGPARSE_OPT_OPTIONAL))

                arg->r_type = 0; /* No optional argument. */

              else

                arg->r_opt = ARGPARSE_MISSING_ARG;

              break;

	    }

          else if (state == 4)

            {

              /* Has an argument. */

              if (in_alias)

                {

                  if (!buffer)

                    arg->r_opt = ARGPARSE_UNEXPECTED_ARG;

                  else

                    {

                      char *p;

                      buffer[i] = 0;

                      p = strpbrk (buffer, " \t");

                      if (p)

                        {

                          *p++ = 0;

                          trim_spaces (p);

			}

                      if (!p || !*p)

                        {

                          xfree (buffer);

                          arg->r_opt = ARGPARSE_INVALID_ALIAS;

                        }

                      else

                        {

                          store_alias (arg, buffer, p);

                        }

		    }

		}

              else if (!(opts[idx].flags & ARGPARSE_TYPE_MASK))

                arg->r_opt = ARGPARSE_UNEXPECTED_ARG;

              else

                {

                  char *p;

                  if (!buffer)

                    {

                      keyword[i] = 0;

                      buffer = xtrystrdup (keyword);

                      if (!buffer)

                        arg->r_opt = ARGPARSE_OUT_OF_CORE;

		    }

                  else

                    buffer[i] = 0;

                  if (buffer)

                    {

                      trim_spaces (buffer);

                      p = buffer;

                      if (*p == '"')

                        {

                          /* Remove quotes. */

                          p++;

                          if (*p && p[strlen(p)-1] == '\"' )

                            p[strlen(p)-1] = 0;

                        }

                      if (!set_opt_arg (arg, opts[idx].flags, p))

                        xfree (buffer);

                    }

                }

              break;

            }

          else if (c == EOF)

            {

              ignore_invalid_option_clear (arg);

              if (ferror (fp))

                arg->r_opt = ARGPARSE_READ_ERROR;

              else

                arg->r_opt = 0; /* EOF. */

              break;

            }

          state = 0;

          i = 0;

        }

      else if (state == -1)

        ; /* Skip. */

      else if (state == 0 && isascii (c) && isspace(c))

        ; /* Skip leading white space.  */

      else if (state == 0 && c == '#' )

        state = 1;	/* Start of a comment.  */

      else if (state == 1)

        ; /* Skip comments. */

      else if (state == 2 && isascii (c) && isspace(c))

        {

          /* Check keyword.  */

          keyword[i] = 0;

          for (i=0; opts[i].short_opt; i++ )

            if (opts[i].long_opt && !strcmp (opts[i].long_opt, keyword))

              break;

          idx = i;

          arg->r_opt = opts[idx].short_opt;

          if ((opts[idx].flags & ARGPARSE_OPT_IGNORE))

            {

              state = 1; /* Process like a comment.  */

            }

          else if (!opts[idx].short_opt)

            {

              if (!strcmp (keyword, "alias"))

                {

                  in_alias = 1;

                  state = 3;

                }

              else if (!strcmp (keyword, "ignore-invalid-option"))

                {

                  if (ignore_invalid_option_add (arg, fp))

                    {

                      arg->r_opt = ARGPARSE_OUT_OF_CORE;

                      break;

                    }

                  state = i = 0;

                  ++*lineno;

                }

              else if (ignore_invalid_option_p (arg, keyword))

                state = 1; /* Process like a comment.  */

              else

                {

                  arg->r_opt = ((opts[idx].flags & ARGPARSE_OPT_COMMAND)

                                ? ARGPARSE_INVALID_COMMAND

                                : ARGPARSE_INVALID_OPTION);

                  state = -1; /* Skip rest of line and leave.  */

                }

            }

          else

            state = 3;

        }

      else if (state == 3)

        {

          /* Skip leading spaces of the argument.  */

          if (!isascii (c) || !isspace(c))

            {

              i = 0;

              keyword[i++] = c;

              state = 4;

            }

        }

      else if (state == 4)

        {

          /* Collect the argument. */

          if (buffer)

            {

              if (i < buflen-1)

                buffer[i++] = c;

              else

                {

                  char *tmp;

                  size_t tmplen = buflen + 50;

                  tmp = xtryrealloc (buffer, tmplen);

                  if (tmp)

                    {

                      buflen = tmplen;

                      buffer = tmp;

                      buffer[i++] = c;

                    }

                  else

                    {

                      xfree (buffer);

                      arg->r_opt = ARGPARSE_OUT_OF_CORE;

                      break;

                    }

                }

            }

          else if (i < DIM(keyword)-1)

            keyword[i++] = c;

          else

            {

              size_t tmplen = DIM(keyword) + 50;

              buffer = xtrymalloc (tmplen);

              if (buffer)

                {

                  buflen = tmplen;

                  memcpy(buffer, keyword, i);

                  buffer[i++] = c;

                }

              else

                {

                  arg->r_opt = ARGPARSE_OUT_OF_CORE;

                  break;

                }

            }

        }

      else if (i >= DIM(keyword)-1)

        {

          arg->r_opt = ARGPARSE_KEYWORD_TOO_LONG;

          state = -1; /* Skip rest of line and leave.  */

        }

      else

        {

          keyword[i++] = c;

          state = 2;

        }

    }

  return arg->r_opt;

}

static int

find_long_option( ARGPARSE_ARGS *arg,

		  ARGPARSE_OPTS *opts, const char *keyword )

{

    int i;

    size_t n;

    (void)arg;

    /* Would be better if we can do a binary search, but it is not

       possible to reorder our option table because we would mess

       up our help strings - What we can do is: Build a nice option

       lookup table when this function is first invoked */

    if( !*keyword )

	return -1;

    for(i=0; opts[i].short_opt; i++ )

	if( opts[i].long_opt && !strcmp( opts[i].long_opt, keyword) )

	    return i;

#if 0

    {

	ALIAS_DEF a;

	/* see whether it is an alias */

	for( a = args->internal.aliases; a; a = a->next ) {

	    if( !strcmp( a->name, keyword) ) {

		/* todo: must parse the alias here */

		args->internal.cur_alias = a;

		return -3; /* alias available */

	    }

	}

    }

#endif

    /* not found, see whether it is an abbreviation */

    /* aliases may not be abbreviated */

    n = strlen( keyword );

    for(i=0; opts[i].short_opt; i++ ) {

	if( opts[i].long_opt && !strncmp( opts[i].long_opt, keyword, n ) ) {

	    int j;

	    for(j=i+1; opts[j].short_opt; j++ ) {

		if( opts[j].long_opt