1 /* $NetBSD: getopt.c,v 1.27 2005/11/29 03:12:00 christos Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994
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 name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #undef LIBC_SCCS
33
34 #if !defined(_WIN32)
35 # include <sys/cdefs.h>
36 #else
37 # define __UNCONST(x) ((char*)(x))
38 # define getprogname() (nargv[0])
39 # define _DIAGASSERT(x) assert((x))
40 #endif
41
42 #include <assert.h>
43 #include <errno.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #if !defined(_WIN32)
48 # include <unistd.h>
49 #endif
50
51 #include <freetds/sysdep_private.h>
52
53 #ifdef __weak_alias
54 __weak_alias(getopt,_getopt)
55 #endif
56
57 int opterr = 1, /* if error message should be printed */
58 optind = 1, /* index into parent argv vector */
59 optopt, /* character checked for validity */
60 optreset; /* reset getopt */
61 char *optarg; /* argument associated with option */
62
63 #define BADCH (int)'?'
64 #define BADARG (int)':'
65 #define EMSG ""
66
67 /*
68 * getopt --
69 * Parse argc/argv argument vector.
70 */
71 int
tds_getopt(nargc,nargv,ostr)72 tds_getopt(nargc, nargv, ostr)
73 int nargc;
74 char * const nargv[];
75 const char *ostr;
76 {
77 static const char *place = EMSG; /* option letter processing */
78 char *oli; /* option letter list index */
79
80 _DIAGASSERT(nargv != NULL);
81 _DIAGASSERT(ostr != NULL);
82
83 if (optreset || *place == 0) { /* update scanning pointer */
84 optreset = 0;
85 place = nargv[optind];
86 if (optind >= nargc || *place++ != '-') {
87 /* Argument is absent or is not an option */
88 place = EMSG;
89 return (-1);
90 }
91 optopt = *place++;
92 if (optopt == '-' && *place == 0) {
93 /* "--" => end of options */
94 ++optind;
95 place = EMSG;
96 return (-1);
97 }
98 if (optopt == 0) {
99 /* Solitary '-', treat as a '-' option
100 if the program (eg su) is looking for it. */
101 place = EMSG;
102 if (strchr(ostr, '-') == NULL)
103 return -1;
104 optopt = '-';
105 }
106 } else
107 optopt = *place++;
108
109 /* See if option letter is one the caller wanted... */
110 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
111 if (*place == 0)
112 ++optind;
113 if (opterr && *ostr != ':')
114 (void)fprintf(stderr,
115 "%s: unknown option -- %c\n", getprogname(),
116 optopt);
117 return (BADCH);
118 }
119
120 /* Does this option need an argument? */
121 if (oli[1] != ':') {
122 /* don't need argument */
123 optarg = NULL;
124 if (*place == 0)
125 ++optind;
126 } else {
127 /* Option-argument is either the rest of this argument or the
128 entire next argument. */
129 if (*place)
130 optarg = __UNCONST(place);
131 else if (nargc > ++optind)
132 optarg = nargv[optind];
133 else {
134 /* option-argument absent */
135 place = EMSG;
136 if (*ostr == ':')
137 return (BADARG);
138 if (opterr)
139 (void)fprintf(stderr,
140 "%s: option requires an argument -- %c\n",
141 getprogname(), optopt);
142 return (BADCH);
143 }
144 place = EMSG;
145 ++optind;
146 }
147 return (optopt); /* return option letter */
148 }
149