1/*-
2 * See the file LICENSE for redistribution information.
3 *
4 * Copyright (c) 1996,2008 Oracle.  All rights reserved.
5 */
6/*
7 * Copyright (c) 1987, 1993, 1994
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $Id: getopt.c,v 12.8 2008/03/12 17:50:25 mbrey Exp $
35 */
36
37#include "db_config.h"
38
39#include "db_int.h"
40
41int	__db_getopt_reset;	/* global reset for VxWorks. */
42
43int	opterr = 1,		/* if error message should be printed */
44	optind = 1,		/* index into parent argv vector */
45	optopt,			/* character checked for validity */
46	optreset;		/* reset getopt */
47char	*optarg;		/* argument associated with option */
48
49#undef	BADCH
50#define	BADCH	(int)'?'
51#undef	BADARG
52#define	BADARG	(int)':'
53#undef	EMSG
54#define	EMSG	""
55
56/*
57 * getopt --
58 *	Parse argc/argv argument vector.
59 *
60 * PUBLIC: #ifndef HAVE_GETOPT
61 * PUBLIC: int getopt __P((int, char * const *, const char *));
62 * PUBLIC: #endif
63 */
64int
65getopt(nargc, nargv, ostr)
66	int nargc;
67	char * const *nargv;
68	const char *ostr;
69{
70	static char *progname;
71	static char *place = EMSG;		/* option letter processing */
72	char *oli;				/* option letter list index */
73
74	/*
75	 * VxWorks needs to be able to repeatedly call getopt from multiple
76	 * programs within its global name space.
77	 */
78	if (__db_getopt_reset) {
79		__db_getopt_reset = 0;
80
81		opterr = optind = 1;
82		optopt = optreset = 0;
83		optarg = NULL;
84		progname = NULL;
85		place = EMSG;
86	}
87	if (!progname) {
88		if ((progname = __db_rpath(*nargv)) == NULL)
89			progname = *nargv;
90		else
91			++progname;
92	}
93
94	if (optreset || !*place) {		/* update scanning pointer */
95		optreset = 0;
96		if (optind >= nargc || *(place = nargv[optind]) != '-') {
97			place = EMSG;
98			return (EOF);
99		}
100		if (place[1] && *++place == '-') {	/* found "--" */
101			++optind;
102			place = EMSG;
103			return (EOF);
104		}
105	}					/* option letter okay? */
106	if ((optopt = (int)*place++) == (int)':' ||
107	    !(oli = strchr(ostr, optopt))) {
108		/*
109		 * if the user didn't specify '-' as an option,
110		 * assume it means EOF.
111		 */
112		if (optopt == (int)'-')
113			return (EOF);
114		if (!*place)
115			++optind;
116		if (opterr && *ostr != ':')
117			(void)fprintf(stderr,
118			    "%s: illegal option -- %c\n", progname, optopt);
119		return (BADCH);
120	}
121	if (*++oli != ':') {			/* don't need argument */
122		optarg = NULL;
123		if (!*place)
124			++optind;
125	}
126	else {					/* need an argument */
127		if (*place)			/* no white space */
128			optarg = place;
129		else if (nargc <= ++optind) {	/* no arg */
130			place = EMSG;
131			if (*ostr == ':')
132				return (BADARG);
133			if (opterr)
134				(void)fprintf(stderr,
135				    "%s: option requires an argument -- %c\n",
136				    progname, optopt);
137			return (BADCH);
138		}
139		else				/* white space */
140			optarg = nargv[optind];
141		place = EMSG;
142		++optind;
143	}
144	return (optopt);			/* dump back option letter */
145}
146