1 /* $NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994, 1995
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. Neither the names of the copyright holders nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
20 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if 0
33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
34 #endif
35
36 #include <assert.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <string.h>
40
41 #define __P(x) x
42 #define _DIAGASSERT(x) assert(x)
43
44 #ifdef __weak_alias
45 __weak_alias(getopt,_getopt);
46 #endif
47
48
49 int opterr = 1, /* if error message should be printed */
50 optind = 1, /* index into parent argv vector */
51 optopt, /* character checked for validity */
52 optreset; /* reset getopt */
53 char *optarg; /* argument associated with option */
54
55 static char * _progname __P((char *));
56 int getopt_internal __P((int, char * const *, const char *));
57
58 static char *
_progname(nargv0)59 _progname(nargv0)
60 char * nargv0;
61 {
62 char * tmp;
63
64 _DIAGASSERT(nargv0 != NULL);
65
66 tmp = strrchr(nargv0, '/');
67 if (tmp)
68 tmp++;
69 else
70 tmp = nargv0;
71 return(tmp);
72 }
73
74 #define BADCH (int)'?'
75 #define BADARG (int)':'
76 #define EMSG ""
77
78 /*
79 * getopt --
80 * Parse argc/argv argument vector.
81 */
82 int
getopt(nargc,nargv,ostr)83 getopt(nargc, nargv, ostr)
84 int nargc;
85 char * const nargv[];
86 const char *ostr;
87 {
88 static char *__progname = 0;
89 static char *place = EMSG; /* option letter processing */
90 char *oli; /* option letter list index */
91 __progname = __progname?__progname:_progname(*nargv);
92
93 _DIAGASSERT(nargv != NULL);
94 _DIAGASSERT(ostr != NULL);
95
96 if (optreset || !*place) { /* update scanning pointer */
97 optreset = 0;
98 if (optind >= nargc || *(place = nargv[optind]) != '-') {
99 place = EMSG;
100 return (-1);
101 }
102 if (place[1] && *++place == '-' /* found "--" */
103 && place[1] == '\0') {
104 ++optind;
105 place = EMSG;
106 return (-1);
107 }
108 } /* option letter okay? */
109 if ((optopt = (int)*place++) == (int)':' ||
110 !(oli = strchr(ostr, optopt))) {
111 /*
112 * if the user didn't specify '-' as an option,
113 * assume it means -1.
114 */
115 if (optopt == (int)'-')
116 return (-1);
117 if (!*place)
118 ++optind;
119 if (opterr && *ostr != ':')
120 (void)fprintf(stderr,
121 "%s: illegal option -- %c\n", __progname, optopt);
122 return (BADCH);
123 }
124 if (*++oli != ':') { /* don't need argument */
125 optarg = NULL;
126 if (!*place)
127 ++optind;
128 }
129 else { /* need an argument */
130 if (*place) /* no white space */
131 optarg = place;
132 else if (nargc <= ++optind) { /* no arg */
133 place = EMSG;
134 if (*ostr == ':')
135 return (BADARG);
136 if (opterr)
137 (void)fprintf(stderr,
138 "%s: option requires an argument -- %c\n",
139 __progname, optopt);
140 return (BADCH);
141 }
142 else /* white space */
143 optarg = nargv[optind];
144 place = EMSG;
145 ++optind;
146 }
147 return (optopt); /* dump back option letter */
148 }
149
150