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
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42
43 /* declarations to provide consistent linkage */
44 extern char *optarg;
45 extern int optind;
46 extern int opterr;
47
48 int opterr = 1, /* if error message should be printed */
49 optind = 1, /* index into parent argv vector */
50 optopt, /* character checked for validity */
51 optreset; /* reset getopt */
52 char *optarg; /* argument associated with option */
53
54 #define BADCH (int)'?'
55 #define BADARG (int)':'
56 #define EMSG ""
57
58 /*
59 * getopt --
60 * Parse argc/argv argument vector.
61 */
62 int
63 getopt(nargc, nargv, ostr)
64 int nargc;
65 char * const *nargv;
66 const char *ostr;
67 {
68 static char *place = EMSG; /* option letter processing */
69 char *oli; /* option letter list index */
70
71 if (optreset || !*place) { /* update scanning pointer */
72 optreset = 0;
73 if (optind >= nargc || *(place = nargv[optind]) != '-') {
74 place = EMSG;
75 return (EOF);
76 }
77 if (place[1] && *++place == '-') { /* found "--" */
78 ++optind;
79 place = EMSG;
80 return (EOF);
81 }
82 } /* option letter okay? */
83 if ((optopt = (int)*place++) == (int)':' ||
84 !(oli = strchr(ostr, optopt))) {
85 /*
86 * if the user didn't specify '-' as an option,
87 * assume it means EOF.
88 */
89 if (optopt == (int)'-')
90 return (EOF);
91 if (!*place)
92 ++optind;
93 if (opterr && *ostr != ':')
94 (void)fprintf(stderr,
95 "%s: illegal option -- %c\n", __FILE__, optopt);
96 return (BADCH);
97 }
98 if (*++oli != ':') { /* don't need argument */
99 optarg = NULL;
100 if (!*place)
101 ++optind;
102 }
103 else { /* need an argument */
104 if (*place) /* no white space */
105 optarg = place;
106 else if (nargc <= ++optind) { /* no arg */
107 place = EMSG;
108 if (*ostr == ':')
109 return (BADARG);
110 if (opterr)
111 (void)fprintf(stderr,
112 "%s: option requires an argument -- %c\n",
113 __FILE__, optopt);
114 return (BADCH);
115 }
116 else /* white space */
117 optarg = nargv[optind];
118 place = EMSG;
119 ++optind;
120 }
121 return (optopt); /* dump back option letter */
122 }
123
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