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getopt_long.c

/*
   getopt_long.c - implementation of getopt_long() for systems that lack it

   Copyright (C) 2002 Arthur de Jong

   This program is free software; you can 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 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
*/


#include "config.h"

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include "getopt_long.h"


/* this is a (poor) getopt_long() replacement for systems that don't have it
   (this is generaly a GNU extention) 
   this implementation is by no meens flawless, especialy the optional arguments
   to options and options following filenames is not quite right, allso
   minimal error checking
   */
int
getopt_long(int argc,char * const argv[],
            const char *optstring,
            const struct option *longopts,int *longindex)
{
  int i;   /* for looping through options */
  int l;   /* for length */

  /* first check if there realy is a -- option */
  if ((optind>0)&&(optind<argc)&&(strncmp(argv[optind],"--",2)==0)&&(argv[optind][2]!='\0'))
  {
    /* check the longopts list for a valid option */
    for (i=0;longopts[i].name!=NULL;i++)
    {
      /* save the length for later */
      l=strlen(longopts[i].name);
      if (strncmp(argv[optind]+2,longopts[i].name,l)==0)
      {
        /* we have a match */
        if ((longopts[i].has_arg==no_argument)&&(argv[optind][2+l]=='\0'))
        {
          optind++;
          return longopts[i].val;
        }
        else if ((longopts[i].has_arg==required_argument)&&(argv[optind][2+l]=='='))
        {
          optarg=argv[optind]+3+l;
          optind++;
          return longopts[i].val;
        }
        else if ((longopts[i].has_arg==required_argument)&&(argv[optind][2+l]=='\0'))
        {
          optarg=argv[optind+1];
          optind+=2;
          return longopts[i].val;
        }
        else if ((longopts[i].has_arg==optional_argument)&&(argv[optind][2+l]=='='))
        {
          optarg=argv[optind]+3+l;
          optind++;
          return longopts[i].val;
        }
        else if ((longopts[i].has_arg==optional_argument)&&(argv[optind][2+l]=='\0'))
        {
          optind++;
          return longopts[i].val;
        }
      }
    }
  }
  /* if all else fails use plain getopt() */
  return getopt(argc,argv,optstring);
}

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