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