1 /*
2 * getopt.c --
3 *
4 * Standard UNIX getopt function. Code is from BSD.
5 *
6 * Copyright (c) 1987-2002 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * A. Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 * B. Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * C. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
22 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /* #if !defined(lint)
35 * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
36 * #endif
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 static char *place = EMSG; /* option letter processing */
61 char *oli; /* option letter list index */
62
63 if (optreset || !*place) { /* update scanning pointer */
64 optreset = 0;
65 if (optind >= nargc || *(place = nargv[optind]) != '-') {
66 place = EMSG;
67 return (EOF);
68 }
69 if (place[1] && *++place == '-') { /* found "--" */
70 ++optind;
71 place = EMSG;
72 return (EOF);
73 }
74 } /* option letter okay? */
75 if ((optopt = (int)*place++) == (int)':' || !(oli = (char *)strchr(ostr, optopt))) {
76 /*
77 * if the user didn't specify '-' as an option,
78 * assume it means EOF.
79 */
80 if (optopt == (int)'-')
81 return (EOF);
82 if (!*place)
83 ++optind;
84 if (opterr && *ostr != ':')
85 (void)fprintf(stderr, "illegal option -- %c\n", 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, "option requires an argument -- %c\n", optopt);
102 return (BADCH);
103 }
104 else /* white space */
105 optarg = nargv[optind];
106 place = EMSG;
107 ++optind;
108 }
109 return (optopt); /* dump back option letter */
110 }
111