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getopt.c

/*
 * Copyright (c) 1987, 1993, 1994
 *    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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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(LIBC_SCCS) && !defined(lint)
/* static char sccsid[] = "from: @(#)getopt.c   8.2 (Berkeley) 4/2/94"; */
static char *rcsid = "$Id: getopt.c,v 1.2 1995/12/04 15:39:28 brezak Exp $";
#endif /* LIBC_SCCS and not lint */

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

#ifdef _BSD
extern char *__progname;
#else
#define __progname "getopt"
#endif

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(nargc, nargv, ostr)
      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 (-1);
            }
            if (place[1] && *++place == '-') {  /* found "--" */
                  ++optind;
                  place = EMSG;
                  return (-1);
            }
      }                             /* option letter okay? */
      if ((optopt = (int)*place++) == (int)':' ||
          !(oli = strchr(ostr, optopt))) {
            /*
             * if the user didn't specify '-' as an option,
             * assume it means -1.
             */
            if (optopt == (int)'-')
                  return (-1);
            if (!*place)
                  ++optind;
            if (opterr && *ostr != ':')
                  (void)fprintf(stderr,
                      "%s: illegal option -- %c\n", __progname, 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,
                            "%s: option requires an argument -- %c\n",
                            __progname, optopt);
                  return (BADCH);
            }
            else                    /* white space */
                  optarg = nargv[optind];
            place = EMSG;
            ++optind;
      }
      return (optopt);              /* dump back option letter */
}

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