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 <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
35 #endif /* LIBC_SCCS and not lint */
36
37 #include "stand.h"
38 #include <string.h>
39
40 int opterr = 1, /* if error message should be printed */
41 optind = 1, /* index into parent argv vector */
42 optopt, /* character checked for validity */
43 optreset; /* reset getopt */
44 char *optarg; /* argument associated with option */
45
46 #define BADCH (int)'?'
47 #define BADARG (int)':'
48 #define EMSG ""
49
50 /*
51 * getopt --
52 * Parse argc/argv argument vector.
53 */
54 int
getopt(int nargc,char * const * nargv,const char * ostr)55 getopt(int nargc, char * const *nargv, const char *ostr)
56 {
57 static char *place = EMSG; /* option letter processing */
58 char *oli; /* option letter list index */
59
60 if (optreset || !*place) { /* update scanning pointer */
61 optreset = 0;
62 if (optind >= nargc || *(place = nargv[optind]) != '-') {
63 place = EMSG;
64 return (-1);
65 }
66 if (place[1] && *++place == '-') { /* found "--" */
67 ++optind;
68 place = EMSG;
69 return (-1);
70 }
71 } /* option letter okay? */
72 if ((optopt = (int)*place++) == (int)':' ||
73 !(oli = strchr(ostr, optopt))) {
74 /*
75 * if the user didn't specify '-' as an option,
76 * assume it means -1.
77 */
78 if (optopt == (int)'-')
79 return (-1);
80 if (!*place)
81 ++optind;
82 if (opterr && *ostr != ':')
83 (void)printf("illegal option -- %c\n", optopt);
84 return (BADCH);
85 }
86 if (*++oli != ':') { /* don't need argument */
87 optarg = NULL;
88 if (!*place)
89 ++optind;
90 }
91 else { /* need an argument */
92 if (*place) /* no white space */
93 optarg = place;
94 else if (nargc <= ++optind) { /* no arg */
95 place = EMSG;
96 if (*ostr == ':')
97 return (BADARG);
98 if (opterr)
99 (void)printf("option requires an argument -- %c\n", optopt);
100 return (BADCH);
101 }
102 else /* white space */
103 optarg = nargv[optind];
104 place = EMSG;
105 ++optind;
106 }
107 return (optopt); /* dump back option letter */
108 }
109