1/*
2 * Copyright (c) 1984 through 2008, William LeFebvre
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 are met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *
16 *     * Neither the name of William LeFebvre nor the names of other
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * "getopt" routine customized for top.
35 */
36
37/*
38 * Many modern-day Unix implementations already have this function
39 * in libc.  The standard "getopt" is perfectly sufficient for top's
40 * needs.  If such a function exists in libc then you certainly don't
41 * need to compile this one in.  To prevent this function from being
42 * compiled, define "HAVE_GETOPT".  This is usually done in the "CFLAGS"
43 * line of the corresponding machine module.
44 */
45
46/*
47 * This empty declaration exists solely to placate overexhuberant C
48 * compilers that like to warn you about content-free files.
49 */
50static void __empty();
51
52#ifndef HAVE_GETOPT
53
54/*LINTLIBRARY*/
55
56#include "os.h"
57#ifndef NULL
58#define NULL	0
59#endif
60#ifndef EOF
61#define EOF	(-1)
62#endif
63#define ERR(s, c)	if(opterr){\
64	extern int write();\
65	char errbuf[2];\
66	errbuf[0] = c; errbuf[1] = '\n';\
67	(void) write(2, argv[0], strlen(argv[0]));\
68	(void) write(2, s, strlen(s));\
69	(void) write(2, errbuf, 2);}
70
71
72int	opterr = 1;
73int	optind = 1;
74int	optopt;
75char	*optarg;
76
77int
78getopt(int argc, char **argv, char *opts)
79
80{
81	static int sp = 1;
82	register int c;
83	register char *cp;
84
85	if(sp == 1)
86		if(optind >= argc ||
87		   argv[optind][0] != '-' || argv[optind][1] == '\0')
88			return(EOF);
89		else if(strcmp(argv[optind], "--") == 0) {
90			optind++;
91			return(EOF);
92		}
93	optopt = c = argv[optind][sp];
94	if(c == ':' || (cp=strchr(opts, c)) == NULL) {
95		ERR(": unknown option, -", c);
96		if(argv[optind][++sp] == '\0') {
97			optind++;
98			sp = 1;
99		}
100		return('?');
101	}
102	if(*++cp == ':') {
103		if(argv[optind][sp+1] != '\0')
104			optarg = &argv[optind++][sp+1];
105		else if(++optind >= argc) {
106			ERR(": argument missing for -", c);
107			sp = 1;
108			return('?');
109		} else
110			optarg = argv[optind++];
111		sp = 1;
112	} else {
113		if(argv[optind][++sp] == '\0') {
114			sp = 1;
115			optind++;
116		}
117		optarg = NULL;
118	}
119	return(c);
120}
121#endif /* HAVE_GETOPT */
122