1  /*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $	*/
  2  
  3  /*
  4   * Copyright (c) 1987, 1993, 1994
  5   *	The Regents of the University of California.  All rights reserved.
  6   *
  7   * Redistribution and use in source and binary forms, with or without
  8   * modification, are permitted provided that the following conditions
  9   * are met:
 10   * 1. Redistributions of source code must retain the above copyright
 11   *    notice, this list of conditions and the following disclaimer.
 12   * 2. Redistributions in binary form must reproduce the above copyright
 13   *    notice, this list of conditions and the following disclaimer in the
 14   *    documentation and/or other materials provided with the distribution.
 15   * 4. Neither the name of the University nor the names of its contributors
 16   *    may be used to endorse or promote products derived from this software
 17   *    without specific prior written permission.
 18   *
 19   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 20   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 21   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 22   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 23   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 24   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 25   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 26   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 27   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 28   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 29   * SUCH DAMAGE.
 30   */
 31  
 32  #if defined(LIBC_SCCS) && !defined(lint)
 33  static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
 34  #endif /* LIBC_SCCS and not lint */
 35  #include <sys/cdefs.h>
 36  __FBSDID("$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $");
 37  
 38  #include "namespace.h"
 39  #include <stdio.h>
 40  #include <stdlib.h>
 41  #include <string.h>
 42  #include <unistd.h>
 43  #include "un-namespace.h"
 44  
 45  #include "libc_private.h"
 46  
 47  #ifndef BUILDING_VARIANT
 48  int	opterr = 1,		/* if error message should be printed */
 49  	optind = 1,		/* index into parent argv vector */
 50  	optopt,			/* character checked for validity */
 51  	optreset;		/* reset getopt */
 52  char	*optarg;		/* argument associated with option */
 53  #endif /* !BUILDING_VARIANT */
 54  
 55  #define	BADCH	(int)'?'
 56  #define	BADARG	(int)':'
 57  #define	EMSG	""
 58  
 59  #if __DARWIN_UNIX03
 60  #define PROGNAME nargv[0]
 61  #else
 62  #define PROGNAME _getprogname()
 63  #endif
 64  
 65  /*
 66   * getopt --
 67   *	Parse argc/argv argument vector.
 68   */
 69  int
 70  getopt(nargc, nargv, ostr)
 71  	int nargc;
 72  	char * const nargv[];
 73  	const char *ostr;
 74  {
 75  	static char *place = EMSG;		/* option letter processing */
 76  	char *oli;				/* option letter list index */
 77  
 78  	if (optreset || *place == 0) {		/* update scanning pointer */
 79  		optreset = 0;
 80  		place = nargv[optind];
 81  		if (optind >= nargc || *place++ != '-') {
 82  			/* Argument is absent or is not an option */
 83  			place = EMSG;
 84  			return (-1);
 85  		}
 86  		optopt = *place++;
 87  		if (optopt == '-' && *place == 0) {
 88  			/* "--" => end of options */
 89  			++optind;
 90  			place = EMSG;
 91  			return (-1);
 92  		}
 93  		if (optopt == 0) {
 94  			/* Solitary '-', treat as a '-' option
 95  			   if the program (eg su) is looking for it. */
 96  			place = EMSG;
 97  			if (strchr(ostr, '-') == NULL)
 98  				return (-1);
 99  			optopt = '-';
100  		}
101  	} else
102  		optopt = *place++;
103  
104  	/* See if option letter is one the caller wanted... */
105  	if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
106  		if (*place == 0)
107  			++optind;
108  		if (opterr && *ostr != ':')
109  			(void)fprintf(stderr,
110  			    "%s: illegal option -- %c\n",
111  			    PROGNAME, optopt);
112  		return (BADCH);
113  	}
114  
115  	/* Does this option need an argument? */
116  	if (oli[1] != ':') {
117  		/* don't need argument */
118  		optarg = NULL;
119  		if (*place == 0)
120  			++optind;
121  	} else {
122  		/* Option-argument is either the rest of this argument or the
123  		   entire next argument. */
124  		if (*place)
125  			optarg = place;
126  		else if (nargc > ++optind)
127  			optarg = nargv[optind];
128  		else {
129  			/* option-argument absent */
130  #if __DARWIN_UNIX03
131  			/* Yes, the standard will put optind past the last
132  			   argument */
133  			++optind;
134  			optarg = NULL;
135  #endif /* __DARWIN_UNIX03 */
136  			place = EMSG;
137  			if (*ostr == ':')
138  				return (BADARG);
139  			if (opterr)
140  				(void)fprintf(stderr,
141  				    "%s: option requires an argument -- %c\n",
142  				    PROGNAME, optopt);
143  			return (BADCH);
144  		}
145  		place = EMSG;
146  		++optind;
147  	}
148  	return (optopt);			/* return option letter */
149  }