finger client for reactos
[reactos.git] / rosapps / net / 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 /*
46 * get option letter from argument vector
47 */
48 int opterr = 1, /* if error message should be printed */
49 optind = 1, /* index into parent argv vector */
50 optopt; /* character checked for validity */
51 char *optarg; /* argument associated with option */
52
53 #define BADCH (int)'?'
54 #define EMSG ""
55
56 int
57 getopt(int nargc, char * const *nargv, const char *ostr)
58 {
59 static char *place = EMSG; /* option letter processing */
60 register char *oli; /* option letter list index */
61 char *p;
62
63 if (!*place) { /* update scanning pointer */
64 if (optind >= nargc || *(place = nargv[optind]) != '-') {
65 place = EMSG;
66 return(EOF);
67 }
68 if (place[1] && *++place == '-') { /* found "--" */
69 ++optind;
70 place = EMSG;
71 return(EOF);
72 }
73 } /* option letter okay? */
74 if ((optopt = (int)*place++) == (int)':' ||
75 !(oli = strchr(ostr, optopt))) {
76 /*
77 * if the user didn't specify '-' as an option,
78 * assume it means EOF.
79 */
80 if (optopt == (int)'-')
81 return(EOF);
82 if (!*place)
83 ++optind;
84 if (opterr) {
85 if (!(p = strrchr(*nargv, '/')))
86 p = *nargv;
87 else
88 ++p;
89 (void)fprintf(stderr, "%s: illegal option -- %c\n",
90 p, optopt);
91 }
92 return(BADCH);
93 }
94 if (*++oli != ':') { /* don't need argument */
95 optarg = NULL;
96 if (!*place)
97 ++optind;
98 }
99 else { /* need an argument */
100 if (*place) /* no white space */
101 optarg = place;
102 else if (nargc <= ++optind) { /* no arg */
103 place = EMSG;
104 if (!(p = strrchr(*nargv, '/')))
105 p = *nargv;
106 else
107 ++p;
108 if (opterr)
109 (void)fprintf(stderr,
110 "%s: option requires an argument -- %c\n",
111 p, optopt);
112 return(BADCH);
113 }
114 else /* white space */
115 optarg = nargv[optind];
116 place = EMSG;
117 ++optind;
118 }
119 return(optopt); /* dump back option letter */
120 }