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
|
.\" header.tmac. GetData manual macros.
.\"
.\" Copyright (C) 2016 D. V. Wiebe
.\"
.\""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
.\"
.\" This file is part of the GetData project.
.\"
.\" Permission is granted to copy, distribute and/or modify this document
.\" under the terms of the GNU Free Documentation License, Version 1.2 or
.\" any later version published by the Free Software Foundation; with no
.\" Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
.\" Texts. A copy of the license is included in the `COPYING.DOC' file
.\" as part of this distribution.
.\" Format a function name with optional trailer: func_name()trailer
.de FN \" func_name [trailer]
.nh
.BR \\$1 ()\\$2
.hy
..
.\" Format a reference to section 3 of the manual: name(3)trailer
.de F3 \" func_name [trailer]
.nh
.BR \\$1 (3)\\$2
.hy
..
.\" Format the header of a list of definitons
.de DD \" name alt...
.ie "\\$2"" \{ \
.TP 8
.PD
.B \\$1 \}
.el \{ \
.PP
.B \\$1
.PD 0
.DD \\$2 \\$3 \}
..
.\" Start a code block: Note: groff defines an undocumented .SC for
.\" Bell Labs man legacy reasons.
.de SC
.fam C
.na
.nh
..
.\" End a code block
.de EC
.hy
.ad
.fam
..
.\" Format a structure pointer member: struct->member\fRtrailer
.de SPM \" struct member trailer
.nh
.ie "\\$3"" .IB \\$1 ->\: \\$2
.el .IB \\$1 ->\: \\$2\fR\\$3
.hy
..
.\" Format a function argument
.de ARG \" name trailer
.nh
.ie "\\$2"" .I \\$1
.el .IR \\$1 \\$2
.hy
..
.\" Hyphenation exceptions
.hw sarray carray lincom linterp
.\" gd_array_len.3. The gd_array_len man page.
.\"
.\" Copyright (C) 2010, 2011, 2012, 2014, 2016 D. V. Wiebe
.\"
.\""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
.\"
.\" This file is part of the GetData project.
.\"
.\" Permission is granted to copy, distribute and/or modify this document
.\" under the terms of the GNU Free Documentation License, Version 1.2 or
.\" any later version published by the Free Software Foundation; with no
.\" Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
.\" Texts. A copy of the license is included in the `COPYING.DOC' file
.\" as part of this distribution.
.\"
.TH gd_array_len 3 "25 December 2016" "Version 0.10.0" "GETDATA"
.SH NAME
gd_array_len \(em returns the length of a CARRAY or SARRAY field in a Dirfile
.SH SYNOPSIS
.SC
.B #include <getdata.h>
.HP
.BI "size_t gd_array_len(DIRFILE *" dirfile ", const char *" field_code );
.EC
.SH DESCRIPTION
The
.FN gd_array_len
function queries a dirfile(5) database specified by
.ARG dirfile
and calculates the length of the
.BR CARRAY ", " CONST ", " STRING ,
or
.B SARRAY
field called
.ARG field_code .
If
.ARG field_code
contains a valid representation suffix, it will be ignored.
The
.ARG dirfile
argument must point to a valid DIRFILE object previously created by a call to
.F3 gd_open .
.SH RETURN VALUE
Upon successful completion,
.FN gd_array_len
returns a positive integer indicating the array length of the field specified.
(The length of a
.B CONST
or a
.B STRING
field is always 1.) On error, it returns a negative-valued error code. Possible
error codes are:
.DD GD_E_BAD_CODE
The field specified by
.ARG field_code
was not found in the database.
.DD GD_E_BAD_DIRFILE
The supplied dirfile was invalid.
.DD GD_E_BAD_FIELD_TYPE
The field specified by
.ARG field_code
was not of one of the field types listed above.
.PP
The error code is also stored in the
.B DIRFILE
object and may be retrieved after this function returns by calling
.F3 gd_error .
A descriptive error string for the error may be obtained by calling
.F3 gd_error_string .
.SH HISTORY
The
.FN gd_carray_len
function appeared in GetData-0.7.0. It was restricted to
.B CONST
and
.B CARRAY
entries.
In GetData-0.9.0, this function was renamed to
.BR gd_array_len ,
and
.B STRING
entries were now valid for this function.
Before GetData-0.10.0, this function could also fail with the error code
.BR GD_E_ALLOC .
In GetData-0.10.0, the error return from this function changed from -1 to a
negative-valued error code.
.SH SEE ALSO
dirfile(5),
.F3 gd_open ,
.F3 gd_error ,
.F3 gd_error_string
|
