1 /*
2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. 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 the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 int opterr = 1, /* if error message should be printed */
43 optind = 1, /* index into parent argv vector */
44 optopt, /* character checked for validity */
45 optreset; /* reset getopt */
46 char *optarg; /* argument associated with option */
47
48 #define BADCH (int)'?'
49 #define BADARG (int)':'
50 #define EMSG ""
51
52 /*
53 * getopt --
54 * Parse argc/argv argument vector.
55 */
56 int
getopt(nargc,nargv,ostr)57 getopt(nargc, nargv, ostr)
58 int nargc;
59 char * const *nargv;
60 const char *ostr;
61 {
62 #ifdef WIN32
63 char *__progname="windump";
64 #else
65 extern char *__progname;
66 #endif
67 static char *place = EMSG; /* option letter processing */
68 char *oli; /* option letter list index */
69
70 if (optreset || !*place) { /* update scanning pointer */
71 optreset = 0;
72 if (optind >= nargc || *(place = nargv[optind]) != '-') {
73 place = EMSG;
74 return (-1);
75 }
76 if (place[1] && *++place == '-') { /* found "--" */
77 ++optind;
78 place = EMSG;
79 return (-1);
80 }
81 } /* option letter okay? */
82 if ((optopt = (int)*place++) == (int)':' ||
83 !(oli = strchr(ostr, optopt))) {
84 /*
85 * if the user didn't specify '-' as an option,
86 * assume it means -1.
87 */
88 if (optopt == (int)'-')
89 return (-1);
90 if (!*place)
91 ++optind;
92 if (opterr && *ostr != ':')
93 (void)fprintf(stderr,
94 "%s: illegal option -- %c\n", __progname, optopt);
95 return (BADCH);
96 }
97 if (*++oli != ':') { /* don't need argument */
98 optarg = NULL;
99 if (!*place)
100 ++optind;
101 }
102 else { /* need an argument */
103 if (*place) /* no white space */
104 optarg = place;
105 else if (nargc <= ++optind) { /* no arg */
106 place = EMSG;
107 if (*ostr == ':')
108 return (BADARG);
109 if (opterr)
110 (void)fprintf(stderr,
111 "%s: option requires an argument -- %c\n",
112 __progname, optopt);
113 return (BADCH);
114 }
115 else /* white space */
116 optarg = nargv[optind];
117 place = EMSG;
118 ++optind;
119 }
120 return (optopt); /* dump back option letter */
121 }
122