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(int nargc,char * const * nargv,const char * ostr)54 cf_getopt(int nargc, char * const *nargv, const char *ostr)
55 {
56 static const char *place = EMSG; /* option letter processing */
57 char *oli; /* option letter list index */
58 int tmpind;
59
60 if (cf_optreset || !*place) { /* update scanning pointer */
61 cf_optreset = 0;
62 tmpind = cf_optind;
63 while (1) {
64 if (tmpind >= nargc) {
65 place = EMSG;
66 return (-1);
67 }
68 if (*(place = nargv[tmpind]) != '-') {
69 tmpind++;
70 continue; /* lookup next option */
71 }
72 if (place[1] && *++place == '-') { /* found "--" */
73 cf_optind = ++tmpind;
74 place = EMSG;
75 return (-1);
76 }
77 cf_optind = tmpind;
78 break;
79 }
80 } /* option letter okay? */
81 if ((cf_optopt = (int)*place++) == (int)':' ||
82 !(oli = strchr(ostr, cf_optopt))) {
83 /*
84 * if the user didn't specify '-' as an option,
85 * assume it means -1.
86 */
87 if (cf_optopt == (int)'-')
88 return (-1);
89 if (!*place)
90 ++cf_optind;
91 if (cf_opterr && *ostr != ':')
92 (void)fprintf(stderr,
93 "%s: illegal option -- %c\n", __progname, cf_optopt);
94 return (BADCH);
95 }
96 if (*++oli != ':') { /* don't need argument */
97 cf_optarg = NULL;
98 if (!*place)
99 ++cf_optind;
100 }
101 else { /* need an argument */
102 if (*place) /* no white space */
103 cf_optarg = place;
104 else if (nargc <= ++cf_optind) { /* no arg */
105 place = EMSG;
106 if (*ostr == ':')
107 return (BADARG);
108 if (cf_opterr)
109 (void)fprintf(stderr,
110 "%s: option requires an argument -- %c\n",
111 __progname, cf_optopt);
112 return (BADCH);
113 }
114 else /* white space */
115 cf_optarg = nargv[cf_optind];
116 place = EMSG;
117 ++cf_optind;
118 }
119 return (cf_optopt); /* dump back option letter */
120 }
121