text: /*
   * getopt.c --
   *
   *      Standard UNIX getopt function.  Code is from BSD.
   *
   * Copyright (c) 1987-2002 The Regents of the University of California.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * A. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * B. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * C. Neither the names of the copyright holders nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
   * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* #if !defined(lint)
   * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
   * #endif
   */
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  /* declarations to provide consistent linkage */
  extern char *optarg;
  extern int optind;
  extern int opterr;
  
  int     opterr = 1,             /* if error message should be printed */
          optind = 1,             /* index into parent argv vector */
          optopt,                 /* character checked for validity */
          optreset;               /* reset getopt */
  char    *optarg;                /* argument associated with option */
  
  #define BADCH   (int)'?'
  #define BADARG  (int)':'
  #define EMSG    ""
  
  /*
   * getopt --
   *      Parse argc/argv argument vector.
   */
  int
  getopt( int nargc,
  	    char * const *nargv,
          const char *ostr)
  {
          static char *place = EMSG;              /* option letter processing */
          char *oli;                              /* option letter list index */
  
          if (optreset || !*place) {              /* update scanning pointer */
                  optreset = 0;
                  if (optind >= nargc || *(place = nargv[optind]) != '-') {
                          place = EMSG;
                          return (EOF);
                  }
                  if (place[1] && *++place == '-') {      /* found "--" */
                          ++optind;
                          place = EMSG;
                          return (EOF);
                  }
          }                                       /* option letter okay? */
          if ((optopt = (int)*place++) == (int)':' ||
              !(oli = (char*) strchr(ostr, optopt))) {
                  /*
                   * if the user didn't specify '-' as an option,
                   * assume it means EOF.
                   */
                   if (optopt == (int)'-')
                          return (EOF);
                  if (!*place)
                          ++optind;
                   if (opterr && *ostr != ':')
                           (void)fprintf(stderr,
                               "illegal option -- %c\n", optopt);
                   return (BADCH);
           }
           if (*++oli != ':') {                    /* don't need argument */
                   optarg = NULL;
                  if (!*place)
                          ++optind;
          }
          else {                                  /* need an argument */
                  if (*place)                     /* no white space */
                          optarg = place;
                  else if (nargc <= ++optind) {   /* no arg */
                          place = EMSG;
                          if (*ostr == ':')
                                  return (BADARG);
                          if (opterr)
                                  (void)fprintf(stderr,
                                      "option requires an argument -- %c\n",
                                       optopt);
                          return (BADCH);
                  }
                  else                            /* white space */
                          optarg = nargv[optind];
                  place = EMSG;
                  ++optind;
          }
          return (optopt);                        /* dump back option letter */
  }