Logo Search packages:      
Sourcecode: qt4-x11 version File versions  Download package

getopt.c

/* $Id: getopt.c,v 1.2 2005/07/07 16:34:06 dron Exp $ */

/*
 * 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. 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 0
static char sccsid[] = "@(#)getopt.c      8.3 (Berkeley) 4/27/95";
__RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
#endif

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

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 argc, char * const argv[], const char *optstring)
{
      static char *place = EMSG;          /* option letter processing */
      char *oli;                    /* option letter list index */

      if (optreset || *place == 0) {            /* update scanning pointer */
            optreset = 0;
            place = argv[optind];
            if (optind >= argc || *place++ != '-') {
                  /* Argument is absent or is not an option */
                  place = EMSG;
                  return (-1);
            }
            optopt = *place++;
            if (optopt == '-' && *place == 0) {
                  /* "--" => end of options */
                  ++optind;
                  place = EMSG;
                  return (-1);
            }
            if (optopt == 0) {
                  /* Solitary '-', treat as a '-' option
                     if the program (eg su) is looking for it. */
                  place = EMSG;
                  if (strchr(optstring, '-') == NULL)
                        return -1;
                  optopt = '-';
            }
      } else
            optopt = *place++;

      /* See if option letter is one the caller wanted... */
      if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
            if (*place == 0)
                  ++optind;
            if (opterr && *optstring != ':')
                  (void)fprintf(stderr,
                                      "unknown option -- %c\n", optopt);
            return (BADCH);
      }

      /* Does this option need an argument? */
      if (oli[1] != ':') {
            /* don't need argument */
            optarg = NULL;
            if (*place == 0)
                  ++optind;
      } else {
            /* Option-argument is either the rest of this argument or the
               entire next argument. */
            if (*place)
                  optarg = place;
            else if (argc > ++optind)
                  optarg = argv[optind];
            else {
                  /* option-argument absent */
                  place = EMSG;
                  if (*optstring == ':')
                        return (BADARG);
                  if (opterr)
                        (void)fprintf(stderr,
                                        "option requires an argument -- %c\n",
                                        optopt);
                  return (BADCH);
            }
            place = EMSG;
            ++optind;
      }
      return (optopt);              /* return option letter */
}

Generated by  Doxygen 1.6.0   Back to index