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[reactos.git] / base / applications / network / finger / getopt.c
1 /*
2 * Copyright (c) 1987 Regents of the University of California.
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 the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Fri Jun 13 10:39:00 1997, tfelix@fred.net:
34 * Ported to Win32, changed index/rindex to strchr/strrchr
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)getopt.c 4.13 (Berkeley) 2/23/91";
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44
45 #include "getopt.h"
46
47 /*
48 * get option letter from argument vector
49 */
50 int opterr = 1, /* if error message should be printed */
51 optind = 1, /* index into parent argv vector */
52 optopt; /* character checked for validity */
53 const char *optarg; /* argument associated with option */
54
55 #define BADCH (int)'?'
56 #define EMSG ""
57
58 int
59 getopt(int nargc, char * const *nargv, const char *ostr)
60 {
61 static const char *place = EMSG; /* option letter processing */
62 register char *oli; /* option letter list index */
63 char *p;
64
65 if (!*place) { /* update scanning pointer */
66 if (optind >= nargc || *(place = nargv[optind]) != '-') {
67 place = EMSG;
68 return(EOF);
69 }
70 if (place[1] && *++place == '-') { /* found "--" */
71 ++optind;
72 place = EMSG;
73 return(EOF);
74 }
75 } /* option letter okay? */
76 if ((optopt = (int)*place++) == (int)':' ||
77 !(oli = strchr(ostr, optopt))) {
78 /*
79 * if the user didn't specify '-' as an option,
80 * assume it means EOF.
81 */
82 if (optopt == (int)'-')
83 return(EOF);
84 if (!*place)
85 ++optind;
86 if (opterr) {
87 if (!(p = strrchr(*nargv, '/')))
88 p = *nargv;
89 else
90 ++p;
91 (void)fprintf(stderr, "%s: illegal option -- %c\n",
92 p, optopt);
93 }
94 return(BADCH);
95 }
96 if (*++oli != ':') { /* don't need argument */
97 optarg = NULL;
98 if (!*place)
99 ++optind;
100 }
101 else { /* need an argument */
102 if (*place) /* no white space */
103 optarg = place;
104 else if (nargc <= ++optind) { /* no arg */
105 place = EMSG;
106 if (!(p = strrchr(*nargv, '/')))
107 p = *nargv;
108 else
109 ++p;
110 if (opterr)
111 (void)fprintf(stderr,
112 "%s: option requires an argument -- %c\n",
113 p, 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 }