curs_getcchar.3x man page

getcchar, setcchar — Get a wide character string and rendition from a cchar_t or set a cchar_t from a wide-character string

Synopsis

#include <curses.h>

int getcchar(
       const cchar_t *wcval,
       wchar_t *wch,
       attr_t *attrs,
       short *color_pair,
       void *opts );

int setcchar(
       cchar_t *wcval,
       const wchar_t *wch,
       const attr_t attrs,
       short color_pair,
       void *opts );

Description

getcchar

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.

When wch is a null pointer, the getcchar 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

setcchar

The setcchar function initializes the location pointed to by wcval by using:
.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.

Up to CCHARW_MAX-1 nonspacing characters may follow. Additional nonspacing characters are ignored.

The string may contain a single control character instead. In that case, no nonspacing characters are allowed.

Extensions

X/Open Curses documents the opts argument as reserved for future use, saying that it must be null. This implementation  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.

Notes

The wcval argument may be a value generated by a call to setcchar or by a function that has a cchar_t output argument. If wcval is constructed by any other means, the effect is unspecified.

Return Value

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.

Upon successful completion, setcchar returns OK. Otherwise, it returns ERR.

See Also

Functions: curs_attr(3X), curs_color(3X), curses(3X), wcwidth(3).