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 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 int opterr = 1, /* if error message should be printed */
39 optind = 1, /* index into parent argv vector */
40 optopt, /* character checked for validity */
41 optreset; /* reset getopt */
42 char *optarg; /* argument associated with option */
43
44 #define BADCH (int)'?'
45 #define BADARG (int)':'
46 #define EMSG ""
47
48 /*
49 * getopt --
50 * Parse argc/argv argument vector.
51 */
52 int
getopt(nargc,nargv,ostr)53 getopt(nargc, nargv, ostr)
54 int nargc;
55 char * const *nargv;
56 const char *ostr;
57 {
58 static char *place = EMSG; /* option letter processing */
59 char *oli; /* option letter list index */
60
61 if (optreset || !*place) { /* update scanning pointer */
62 optreset = 0;
63 if (optind >= nargc || *(place = nargv[optind]) != '-') {
64 place = EMSG;
65 return (-1);
66 }
67 if (place[1] && *++place == '-') { /* found "--" */
68 ++optind;
69 place = EMSG;
70 return (-1);
71 }
72 } /* option letter okay? */
73 if ((optopt = (int)*place++) == (int)':' ||
74 !(oli = strchr(ostr, optopt))) {
75 /*
76 * if the user didn't specify '-' as an option,
77 * assume it means -1.
78 */
79 if (optopt == (int)'-')
80 return (-1);
81 if (!*place)
82 ++optind;
83 if (opterr && *ostr != ':' && optopt != BADCH)
84 (void)fprintf(stderr, "%s: illegal option -- %c\n",
85 "progname", optopt);
86 return (BADCH);
87 }
88 if (*++oli != ':') { /* don't need argument */
89 optarg = NULL;
90 if (!*place)
91 ++optind;
92 }
93 else { /* need an argument */
94 if (*place) /* no white space */
95 optarg = place;
96 else if (nargc <= ++optind) { /* no arg */
97 place = EMSG;
98 if (*ostr == ':')
99 return (BADARG);
100 if (opterr)
101 (void)fprintf(stderr,
102 "%s: option requires an argument -- %c\n",
103 "progname", optopt);
104 return (BADCH);
105 }
106 else /* white space */
107 optarg = nargv[optind];
108 place = EMSG;
109 ++optind;
110 }
111 return (optopt); /* dump back option letter */
112 }
113