1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
.\"
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for
.\" permission to reproduce portions of its copyrighted documentation.
.\" Original documentation from The Open Group can be obtained online at
.\" http://www.opengroup.org/bookstore/.
.\"
.\" The Institute of Electrical and Electronics Engineers and The Open
.\" Group, have given us permission to reprint portions of their
.\" documentation.
.\"
.\" In the following statement, the phrase ``this text'' refers to portions
.\" of the system documentation.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics
.\" Engineers, Inc and The Open Group. In the event of any discrepancy
.\" between these versions and the original IEEE and The Open Group
.\" Standard, the original IEEE and The Open Group Standard is the referee
.\" document. The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
.\"
.\" This notice shall appear on any product containing this material.
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
.\"
.\"
.\" Copyright (c) 1989 AT&T.
.\" Copyright (c) 2001, The IEEE and The Open Group. All Rights Reserved.
.\" Copyright (c) 2005, Sun Microsystems, Inc. All Rights Reserved.
.\"
.TH GETSUBOPT 3C "Sep 29, 2005"
.SH NAME
getsubopt \- parse suboption arguments from a string
.SH SYNOPSIS
.LP
.nf
#include <stdlib.h>
\fBint\fR \fBgetsubopt\fR(\fBchar **\fR\fIoptionp\fR, \fBchar * const *\fR\fIkeylistp\fR, \fBchar **\fR\fIvaluep\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBgetsubopt()\fR function parses suboption arguments in a flag argument.
Such options often result from the use of \fBgetopt\fR(3C).
.sp
.LP
The \fBgetsubopt()\fR argument \fIoptionp\fR is a pointer to a pointer to the
option argument string. The suboption arguments are separated by commas and
each can consist of either a single token or a token-value pair separated by an
equal sign.
.sp
.LP
The \fIkeylistp\fR argument is a pointer to a vector of strings. The end of the
vector is identified by a null pointer. Each entry in the vector is one of the
possible tokens that might be found in *\fIoptionp\fR. Since commas delimit
suboption arguments in \fIoptionp\fR, they should not appear in any of the
strings pointed to by \fIkeylistp\fR. Similarly, because an equal sign
separates a token from its value, the application should not include an equal
sign in any of the strings pointed to by \fIkeylistp\fR.
.sp
.LP
The \fIvaluep\fR argument is the address of a value string pointer.
.sp
.LP
If a comma appears in \fIoptionp\fR, it is interpreted as a suboption
separator. After commas have been processed, if there are one or more equal
signs in a suboption string, the first equal sign in any suboption string is
interpreted as a separator between a token and a value. Subsequent equal signs
in a suboption string are interpreted as part of the value.
.sp
.LP
If the string at *\fIoptionp\fR contains only one suboption argument
(equivalently, no commas), \fBgetsubopt()\fR updates *\fIoptionp\fR to point to
the null character at the end of the string. Otherwise, it isolates the
suboption argument by replacing the comma separator with a null character and
updates *\fIoptionp\fR to point to the start of the next suboption argument. If
the suboption argument has an associated value (equivalently, contains an equal
sign), \fBgetsubopt()\fR updates *\fIvaluep\fR to point to the value's first
character. Otherwise, it sets *\fIvaluep\fR to a null pointer. The calling
application can use this information to determine whether the presence or
absence of a value for the suboption is an error.
.sp
.LP
Additionally, when \fBgetsubopt()\fR fails to match the suboption with a token
in the \fIkeylistp\fR array, the calling application should decide if this is
an error or if the unrecognized option should be processed in another way.
.SH RETURN VALUES
.sp
.LP
The \fBgetsubopt()\fR function returns the index of the matched token string or
-1 if no token strings were matched.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH EXAMPLES
.LP
\fBExample 1 \fRUse \fBgetsubopt()\fR to process options.
.sp
.LP
The following example demonstrates the processing of options to the
\fBmount\fR(1M) utility using \fBgetsubopt()\fR.
.sp
.in +2
.nf
#include <stdlib.h>
char *myopts[] = {
#define READONLY 0
"ro",
#define READWRITE 1
"rw",
#define WRITESIZE 2
"wsize",
#define READSIZE 3
"rsize",
NULL};
main(argc, argv)
int argc;
char **argv;
{
int sc, c, errflag;
char *options, *value;
extern char *optarg;
extern int optind;
.
.
.
while((c = getopt(argc, argv, "abf:o:")) != -1) {
switch (c) {
case 'a': /* process a option */
break;
case 'b': /* process b option */
break;
case 'f':
ofile = optarg;
break;
case '?':
errflag++;
break;
case 'o':
options = optarg;
while (*options != '\e0') {
switch(getsubopt(&options,myopts,&value)){
case READONLY : /* process ro option */
break;
case READWRITE : /* process rw option */
break;
case WRITESIZE : /* process wsize option */
if (value == NULL) {
error_no_arg();
errflag++;
} else
write_size = atoi(value);
break;
case READSIZE : /* process rsize option */
if (value == NULL) {
error_no_arg();
errflag++;
} else
read_size = atoi(value);
break;
default :
/* process unknown token */
error_bad_token(value);
errflag++;
break;
}
}
break;
}
}
if (errflag) {
/* print usage instructions etc. */
}
for (; optind<argc; optind++) {
/* process remaining arguments */
}
.
.
.
}
.fi
.in -2
.LP
\fBExample 2 \fRParse suboptions.
.sp
.LP
The following example uses the \fBgetsubopt()\fR function to parse a value
argument in the \fIoptarg\fR external variable returned by a call to
\fBgetopt\fR(3C).
.sp
.in +2
.nf
#include <stdlib.h>
\&...
char *tokens[] = {"HOME", "PATH", "LOGNAME", (char *) NULL };
char *value;
int opt, index;
while ((opt = getopt(argc, argv, "e:")) != -1) {
switch(opt) {
case 'e' :
while ((index = getsubopt(&optarg, tokens, &value)) != -1) {
switch(index) {
\&...
}
break;
\&...
}
}
.fi
.in -2
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
_
MT-Level MT-Safe
.TE
.SH SEE ALSO
.sp
.LP
\fBmount\fR(1M), \fBgetopt\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)
|
