const cchar_t *wcval,
void *opts );
The getcchar function gets a wide-character string
and rendition from a cchar_t argument.
When wch is not a null pointer,
the getcchar function does the following:
.IP • 4 Extracts information from a cchar_t value wcval
.IP • 4 Stores the character attributes in the location pointed to by attrs
.IP • 4 Stores the color-pair in the location pointed to by color_pair
.IP • 4 Stores the wide-character string, characters referenced by wcval, into the array pointed to by wch.
is a null pointer, the
function does the following:
.IP • 4 Obtains the number of wide characters pointed to by wcval
.IP • 4 Does not change the data referenced by attrs or color_pair
The setcchar function initializes the location pointed to by wcval
.IP • 4 The character attributes in attrs
.IP • 4 The color pair in color_pair
.IP • 4 The wide-character string pointed to by wch. The string must be L'\0' terminated, contain at most one spacing character, which must be the first.
X/Open Curses documents the opts argument as reserved for future use,
saying that it must be null.
uses that parameter in ABI 6 for the functions which have a color-pair
parameter to support extended color pairs:
.IP • 4 For functions which modify the color, e.g., setcchar, if opts is set it is treated as a pointer to int, and used to set the color pair instead of the short pair parameter.
.IP • 4 For functions which retrieve the color, e.g., getcchar, if opts is set it is treated as a pointer to int, and used to retrieve the color pair as an int value, in addition retrieving it via the standard pointer to short parameter.
When wch is a null pointer, getcchar returns the number of wide characters referenced by wcval, including one for a trailing null.
When wch is not a null pointer, getcchar returns OK upon successful completion, and ERR otherwise.