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curs_in_wchstr

Section: Library calls (3X)
Updated: 202-1-20
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NAME

in_wchstr, in_wchnstr, win_wchstr, win_wchnstr, mvin_wchstr, mvin_wchnstr, mvwin_wchstr, mvwin_wchnstr - get a curses complex character string from a window

SYNOPSIS

#include <curses.h>

int in_wchstr(cchar_t * wchstr);
int win_wchstr(WINDOW * win, cchar_t * wchstr);
int mvin_wchstr(int y, int x, cchar_t * wchstr);
int mvwin_wchstr(WINDOW * win, int y, int x, cchar_t * wchstr);

int in_wchnstr(cchar_t * wchstr, int n);
int win_wchnstr(WINDOW * win, cchar_t * wchstr, int n);
int mvin_wchnstr(int y, int x, cchar_t * wchstr, int n);
int mvwin_wchnstr(WINDOW * win, int y, int x, cchar_t * wchstr, int n)

DESCRIPTION

win_wchstr extracts a curses complex character string from a curses window win, starting at the cursor and stopping at the end of the line, and stores it in wchstr, terminating it with a wide null curses character. win_wchnstr does the same, but copies at most n curses complex characters from win. A negative n implies no limit; win_wchnstr then works like win_wchstr. ncurses(3X) describes the variants of these functions.

RETURN VALUE

These functions return OK on success and ERR on failure.

In ncurses, these functions fail if
.IP * 4 the curses screen has not been initialized,
.IP * 4 (for functions taking a WINDOW pointer argument) win is a null pointer, or
.IP * 4 wchstr is a null pointer.

Functions prefixed with "mv" first perform cursor movement and fail if the position (y, x) is outside the window boundaries.

NOTES

All of these functions except win_wchnstr may be implemented as macros.

Reading a line that overflows the array pointed to by wchstr and its variants causes undefined results. Instead, use the n-infixed functions with a positive n argument no larger than the size of the buffer backing wchstr.

PORTABILITY

X/Open Curses Issue 4 describes these functions. It specifies no error conditions for them.

HISTORY

X/Open Curses Issue 4 (1995) initially specified these functions. The System V Interface Definition Version 4 of the same year specified a function named winwchstr (and the usual variants). This was a later addition to SVr4.x, not appearing in the first SVr4 (1989). It differed from X/Open's later win_wchstr in that it took an argument of type pointe-t-chtype instead of pointe-t-cchar_t.