1 /* $NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #if 0
37 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
38 #endif
39
40 #include <assert.h>
41 #include <errno.h>
42 #include <stdio.h>
43 #include <string.h>
44
45 #define __P(x) x
46 #define _DIAGASSERT(x) assert(x)
47
48 #ifdef __weak_alias
49 __weak_alias(getopt,_getopt);
50 #endif
51
52
53 int opterr = 1, /* if error message should be printed */
54 optind = 1, /* index into parent argv vector */
55 optopt, /* character checked for validity */
56 optreset; /* reset getopt */
57 char *optarg; /* argument associated with option */
58
59 static char * _progname __P((char *));
60 int getopt_internal __P((int, char * const *, const char *));
61
62 static char *
_progname(nargv0)63 _progname(nargv0)
64 char * nargv0;
65 {
66 char * tmp;
67
68 _DIAGASSERT(nargv0 != NULL);
69
70 tmp = strrchr(nargv0, '/');
71 if (tmp)
72 tmp++;
73 else
74 tmp = nargv0;
75 return(tmp);
76 }
77
78 #define BADCH (int)'?'
79 #define BADARG (int)':'
80 #define EMSG ""
81
82 /*
83 * getopt --
84 * Parse argc/argv argument vector.
85 */
86 int
getopt(nargc,nargv,ostr)87 getopt(nargc, nargv, ostr)
88 int nargc;
89 char * const nargv[];
90 const char *ostr;
91 {
92 static char *__progname = 0;
93 static char *place = EMSG; /* option letter processing */
94 char *oli; /* option letter list index */
95 __progname = __progname?__progname:_progname(*nargv);
96
97 _DIAGASSERT(nargv != NULL);
98 _DIAGASSERT(ostr != NULL);
99
100 if (optreset || !*place) { /* update scanning pointer */
101 optreset = 0;
102 if (optind >= nargc || *(place = nargv[optind]) != '-') {
103 place = EMSG;
104 return (-1);
105 }
106 if (place[1] && *++place == '-' /* found "--" */
107 && place[1] == '\0') {
108 ++optind;
109 place = EMSG;
110 return (-1);
111 }
112 } /* option letter okay? */
113 if ((optopt = (int)*place++) == (int)':' ||
114 !(oli = strchr(ostr, optopt))) {
115 /*
116 * if the user didn't specify '-' as an option,
117 * assume it means -1.
118 */
119 if (optopt == (int)'-')
120 return (-1);
121 if (!*place)
122 ++optind;
123 if (opterr && *ostr != ':')
124 (void)fprintf(stderr,
125 "%s: illegal option -- %c\n", __progname, optopt);
126 return (BADCH);
127 }
128 if (*++oli != ':') { /* don't need argument */
129 optarg = NULL;
130 if (!*place)
131 ++optind;
132 }
133 else { /* need an argument */
134 if (*place) /* no white space */
135 optarg = place;
136 else if (nargc <= ++optind) { /* no arg */
137 place = EMSG;
138 if (*ostr == ':')
139 return (BADARG);
140 if (opterr)
141 (void)fprintf(stderr,
142 "%s: option requires an argument -- %c\n",
143 __progname, optopt);
144 return (BADCH);
145 }
146 else /* white space */
147 optarg = nargv[optind];
148 place = EMSG;
149 ++optind;
150 }
151 return (optopt); /* dump back option letter */
152 }
153