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 #include "getopt.h"
43
44 int opterr = 1, /* if error message should be printed */
45 optind = 1, /* index into parent argv vector */
46 optopt, /* character checked for validity */
47 optreset; /* reset getopt */
48 char *optarg; /* argument associated with option */
49
50 #define BADCH (int)'?'
51 #define BADARG (int)':'
52 #define EMSG ""
53
54 /*
55 * getopt --
56 * Parse argc/argv argument vector.
57 */
58 int
getopt(int nargc,char * const * nargv,const char * ostr)59 getopt(int nargc, char * const *nargv, const char *ostr)
60 {
61 char *cp;
62 static char *__progname;
63 static char *place = EMSG; /* option letter processing */
64 char *oli; /* option letter list index */
65
66 if (__progname == NULL) {
67 if ((cp = strrchr(nargv[0], '/')) != NULL)
68 __progname = cp + 1;
69 else
70 __progname = nargv[0];
71 }
72 if (optreset || !*place) { /* update scanning pointer */
73 optreset = 0;
74 if (optind >= nargc || *(place = nargv[optind]) != '-') {
75 place = EMSG;
76 return (-1);
77 }
78 if (place[1] && *++place == '-') { /* found "--" */
79 ++optind;
80 place = EMSG;
81 return (-1);
82 }
83 } /* option letter okay? */
84 if ((optopt = (int)*place++) == (int)':' ||
85 !(oli = strchr(ostr, optopt))) {
86 /*
87 * if the user didn't specify '-' as an option,
88 * assume it means -1.
89 */
90 if (optopt == (int)'-')
91 return (-1);
92 if (!*place)
93 ++optind;
94 if (opterr && *ostr != ':')
95 (void)fprintf(stderr,
96 "%s: illegal option -- %c\n", __progname, optopt);
97 return (BADCH);
98 }
99 if (*++oli != ':') { /* don't need argument */
100 optarg = NULL;
101 if (!*place)
102 ++optind;
103 }
104 else { /* need an argument */
105 if (*place) /* no white space */
106 optarg = place;
107 else if (nargc <= ++optind) { /* no arg */
108 place = EMSG;
109 if (*ostr == ':')
110 return (BADARG);
111 if (opterr)
112 (void)fprintf(stderr,
113 "%s: option requires an argument -- %c\n",
114 __progname, optopt);
115 return (BADCH);
116 }
117 else /* white space */
118 optarg = nargv[optind];
119 place = EMSG;
120 ++optind;
121 }
122 return (optopt); /* dump back option letter */
123 }
124