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 * 4. 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 "unifdef.h"
31
32 int opterr = 1, /* if error message should be printed */
33 optind = 1, /* index into parent argv vector */
34 optopt, /* character checked for validity */
35 optreset; /* reset getopt */
36 char *optarg; /* argument associated with option */
37
38 #define BADCH (int)'?'
39 #define BADARG (int)':'
40
41 static char EMSG[] = "";
42
43 /*
44 * getopt --
45 * Parse argc/argv argument vector.
46 */
47 int
getopt(int nargc,char * nargv[],const char * ostr)48 getopt(int nargc, char *nargv[], const char *ostr)
49 {
50 static char *place = EMSG; /* option letter processing */
51 const char *oli; /* option letter list index */
52
53 if (optreset || *place == 0) { /* update scanning pointer */
54 optreset = 0;
55 place = nargv[optind];
56 if (optind >= nargc || *place++ != '-') {
57 /* Argument is absent or is not an option */
58 place = EMSG;
59 return (-1);
60 }
61 optopt = *place++;
62 if (optopt == '-' && *place == 0) {
63 /* "--" => end of options */
64 ++optind;
65 place = EMSG;
66 return (-1);
67 }
68 if (optopt == 0) {
69 /* Solitary '-', treat as a '-' option
70 if the program (eg su) is looking for it. */
71 place = EMSG;
72 if (strchr(ostr, '-') == NULL)
73 return (-1);
74 optopt = '-';
75 }
76 } else
77 optopt = *place++;
78
79 /* See if option letter is one the caller wanted... */
80 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
81 if (*place == 0)
82 ++optind;
83 if (opterr && *ostr != ':')
84 (void)fprintf(stderr,
85 "%s: illegal option -- %c\n", _getprogname(),
86 optopt);
87 return (BADCH);
88 }
89
90 /* Does this option need an argument? */
91 if (oli[1] != ':') {
92 /* don't need argument */
93 optarg = NULL;
94 if (*place == 0)
95 ++optind;
96 } else {
97 /* Option-argument is either the rest of this argument or the
98 entire next argument. */
99 if (*place)
100 optarg = place;
101 else if (nargc > ++optind)
102 optarg = nargv[optind];
103 else {
104 /* option-argument absent */
105 place = EMSG;
106 if (*ostr == ':')
107 return (BADARG);
108 if (opterr)
109 (void)fprintf(stderr,
110 "%s: option requires an argument -- %c\n",
111 _getprogname(), optopt);
112 return (BADCH);
113 }
114 place = EMSG;
115 ++optind;
116 }
117 return (optopt); /* return option letter */
118 }
119