1 /*
2 * Copyright (c) 2000, Boris Popov
3 * 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 Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: cfopt.c,v 1.3 2000/07/11 01:51:49 bp Exp $
33 */
34 #include <sys/param.h>
35
36 #include <stdio.h>
37 #include <string.h>
38
39 #include <cflib.h>
40
41 extern char *__progname;
42
43 int cf_opterr = 1, /* if error message should be printed */
44 cf_optind = 1, /* index into parent argv vector */
45 cf_optopt, /* character checked for validity */
46 cf_optreset; /* reset getopt */
47 const char* cf_optarg; /* argument associated with option */
48
49 #define BADCH (int)'?'
50 #define BADARG (int)':'
51 #define EMSG ""
52
53 int
cf_getopt(nargc,nargv,ostr)54 cf_getopt(nargc, nargv, ostr)
55 int nargc;
56 char * const *nargv;
57 const char *ostr;
58 {
59 static const char *place = EMSG; /* option letter processing */
60 char *oli; /* option letter list index */
61 int tmpind;
62
63 if (cf_optreset || !*place) { /* update scanning pointer */
64 cf_optreset = 0;
65 tmpind = cf_optind;
66 while (1) {
67 if (tmpind >= nargc) {
68 place = EMSG;
69 return (-1);
70 }
71 if (*(place = nargv[tmpind]) != '-') {
72 tmpind++;
73 continue; /* lookup next option */
74 }
75 if (place[1] && *++place == '-') { /* found "--" */
76 cf_optind = ++tmpind;
77 place = EMSG;
78 return (-1);
79 }
80 cf_optind = tmpind;
81 break;
82 }
83 } /* option letter okay? */
84 if ((cf_optopt = (int)*place++) == (int)':' ||
85 !(oli = strchr(ostr, cf_optopt))) {
86 /*
87 * if the user didn't specify '-' as an option,
88 * assume it means -1.
89 */
90 if (cf_optopt == (int)'-')
91 return (-1);
92 if (!*place)
93 ++cf_optind;
94 if (cf_opterr && *ostr != ':')
95 (void)fprintf(stderr,
96 "%s: illegal option -- %c\n", __progname, cf_optopt);
97 return (BADCH);
98 }
99 if (*++oli != ':') { /* don't need argument */
100 cf_optarg = NULL;
101 if (!*place)
102 ++cf_optind;
103 }
104 else { /* need an argument */
105 if (*place) /* no white space */
106 cf_optarg = place;
107 else if (nargc <= ++cf_optind) { /* no arg */
108 place = EMSG;
109 if (*ostr == ':')
110 return (BADARG);
111 if (cf_opterr)
112 (void)fprintf(stderr,
113 "%s: option requires an argument -- %c\n",
114 __progname, cf_optopt);
115 return (BADCH);
116 }
117 else /* white space */
118 cf_optarg = nargv[cf_optind];
119 place = EMSG;
120 ++cf_optind;
121 }
122 return (cf_optopt); /* dump back option letter */
123 }
124