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29 .\" $Id: curs_getcchar.3x,v 1.18 2017/03/31 10:50:54 tom Exp $
30 .TH curs_getcchar 3X ""
31 .de bP
32 .IP \(bu 4
33 ..
34 .SH NAME
35 \fBgetcchar\fP,
36 \fBsetcchar\fP \- Get a wide character string and rendition from a \fBcchar_t\fP or set a \fBcchar_t\fP from a wide-character string
37 .SH SYNOPSIS
38 \fB#include <curses.h>\fP
39 .sp
40 \fBint getcchar(\fP
41 .br
42 .B " const cchar_t *\fIwcval\fP,"
43 .br
44 .B " wchar_t *\fIwch\fP,"
45 .br
46 .B " attr_t *\fIattrs\fP,"
47 .br
48 .B " short *\fIcolor_pair\fP,"
49 .br
50 .B " void *\fIopts\fP );"
51 .sp
52 .B "int setcchar("
53 .br
54 .B " cchar_t *\fIwcval\fP,"
55 .br
56 .B " const wchar_t *\fIwch\fP,"
57 .br
58 .B " const attr_t \fIattrs\fP,"
59 .br
60 .B " short \fIcolor_pair\fP,"
61 .br
62 .B " void *\fIopts\fP );"
63 .SH DESCRIPTION
64 .SS getcchar
65 .PP
66 The \fBgetcchar\fP function gets a wide-character string
67 and rendition from a \fBcchar_t\fP argument.
68 When \fIwch\fP is not a null pointer,
69 the \fBgetcchar\fP function does the following:
70 .bP
71 Extracts information from a \fBcchar_t\fP value \fIwcval\fP
72 .bP
73 Stores the character attributes in the location pointed to by \fIattrs\fP
74 .bP
75 Stores the color-pair in the location pointed to by \fIcolor_pair\fP
76 .bP
77 Stores the wide-character string,
78 characters referenced by \fIwcval\fP, into the array pointed to by \fIwch\fP.
79 .PP
80 When
81 \fIwch\fP
82 is a null pointer, the
83 \fBgetcchar\fP
84 function does the following:
85 .bP
86 Obtains the number of wide characters pointed to by \fIwcval\fP
87 .bP
88 Does not change the data referenced by
89 \fIattrs\fP
90 or
91 \fIcolor_pair\fP
92 .SS setcchar
93 .PP
94 The \fBsetcchar\fP function initializes the location pointed to by \fIwcval\fP
95 by using:
96 .bP
97 The character attributes in
98 \fIattrs\fP
99 .bP
100 The color pair in
101 \fIcolor_pair\fP
102 .bP
103 The wide-character string pointed to by \fIwch\fP.
104 The string must be L'\\0' terminated,
105 contain at most one spacing character,
106 which must be the first.
107 .IP
108 Up to \fBCCHARW_MAX\fP\-1 nonspacing characters may follow.
109 Additional nonspacing characters are ignored.
110 .IP
111 The string may contain a single control character instead.
112 In that case, no nonspacing characters are allowed.
113 .SH EXTENSIONS
114 .PP
115 X/Open Curses documents the \fIopts\fP argument as reserved for future use,
116 saying that it must be null.
117 This implementation
118 uses that parameter in ABI 6 for the functions which have a color-pair
119 parameter to support extended color pairs:
120 .bP
121 For functions which modify the color, e.g., \fBsetcchar\fP,
122 if \fIopts\fP is set it is treated as a pointer to \fBint\fP,
123 and used to set the color pair instead of the \fBshort\fP pair parameter.
124 .bP
125 For functions which retrieve the color, e.g., \fBgetcchar\fP,
126 if \fIopts\fP is set it is treated as a pointer to \fBint\fP,
127 and used to retrieve the color pair as an \fBint\fP value,
128 in addition retrieving it via the standard pointer to \fBshort\fP parameter.
129 .SH NOTES
130 .PP
131 The \fIwcval\fP argument may be a value generated by a call to
132 \fBsetcchar\fP or by a function that has a \fBcchar_t\fP output argument.
133 If \fIwcval\fP is constructed by any other means, the effect is unspecified.
134 .SH RETURN VALUE
135 .PP
136 When \fIwch\fP is a null pointer,
137 \fBgetcchar\fP returns the number of wide characters referenced by
138 \fIwcval\fP,
139 including one for a trailing null.
140 .PP
141 When \fIwch\fP is not a null pointer,
142 \fBgetcchar\fP returns \fBOK\fP upon successful completion,
143 and \fBERR\fP otherwise.
144 .PP
145 Upon successful completion, \fBsetcchar\fP returns \fBOK\fP.
146 Otherwise, it returns \fBERR\fP.
147 .SH SEE ALSO
148 .PP
149 Functions:
150 \fBcurs_attr\fR(3X),
151 \fBcurs_color\fR(3X),
152 \fBcurses\fR(3X),
153 \fBwcwidth\fR(3).