1/*
2 * Copyright (c) 2000, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *    This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: cfopt.c,v 1.3 2000/07/11 01:51:49 bp Exp $
33 */
34#include <sys/param.h>
35
36#include <stdio.h>
37#include <string.h>
38
39#include <cflib.h>
40
41extern char *__progname;
42
43int	cf_opterr = 1,		/* if error message should be printed */
44	cf_optind = 1,		/* index into parent argv vector */
45	cf_optopt,			/* character checked for validity */
46	cf_optreset;		/* reset getopt */
47const char* cf_optarg;		/* argument associated with option */
48
49#define	BADCH	(int)'?'
50#define	BADARG	(int)':'
51#define	EMSG	""
52
53int
54cf_getopt(nargc, nargv, ostr)
55	int nargc;
56	char * const *nargv;
57	const char *ostr;
58{
59	static const char *place = EMSG;		/* option letter processing */
60	char *oli;				/* option letter list index */
61	int tmpind;
62
63	if (cf_optreset || !*place) {		/* update scanning pointer */
64		cf_optreset = 0;
65		tmpind = cf_optind;
66		while (1) {
67			if (tmpind >= nargc) {
68				place = EMSG;
69				return (-1);
70			}
71			if (*(place = nargv[tmpind]) != '-') {
72				tmpind++;
73				continue;	/* lookup next option */
74			}
75			if (place[1] && *++place == '-') {	/* found "--" */
76				cf_optind = ++tmpind;
77				place = EMSG;
78				return (-1);
79			}
80			cf_optind = tmpind;
81			break;
82		}
83	}					/* option letter okay? */
84	if ((cf_optopt = (int)*place++) == (int)':' ||
85	    !(oli = strchr(ostr, cf_optopt))) {
86		/*
87		 * if the user didn't specify '-' as an option,
88		 * assume it means -1.
89		 */
90		if (cf_optopt == (int)'-')
91			return (-1);
92		if (!*place)
93			++cf_optind;
94		if (cf_opterr && *ostr != ':')
95			(void)fprintf(stderr,
96			    "%s: illegal option -- %c\n", __progname, cf_optopt);
97		return (BADCH);
98	}
99	if (*++oli != ':') {			/* don't need argument */
100		cf_optarg = NULL;
101		if (!*place)
102			++cf_optind;
103	}
104	else {					/* need an argument */
105		if (*place)			/* no white space */
106			cf_optarg = place;
107		else if (nargc <= ++cf_optind) {	/* no arg */
108			place = EMSG;
109			if (*ostr == ':')
110				return (BADARG);
111			if (cf_opterr)
112				(void)fprintf(stderr,
113				    "%s: option requires an argument -- %c\n",
114				    __progname, cf_optopt);
115			return (BADCH);
116		}
117	 	else				/* white space */
118			cf_optarg = nargv[cf_optind];
119		place = EMSG;
120		++cf_optind;
121	}
122	return (cf_optopt);			/* dump back option letter */
123}
124