curs_get_wstr(3x) — Linux manual page


curs_get_wstr(3X)                                          curs_get_wstr(3X)

NAME         top

       get_wstr, getn_wstr, wget_wstr, wgetn_wstr, mvget_wstr, mvgetn_wstr,
       mvwget_wstr, mvwgetn_wstr - get an array of wide characters from a
       curses terminal keyboard

SYNOPSIS         top

       #include <curses.h>

       int get_wstr(wint_t *wstr);
       int getn_wstr(wint_t *wstr, int n);
       int wget_wstr(WINDOW *win, wint_t *wstr);
       int wgetn_wstr(WINDOW *win, wint_t *wstr, int n);
       int mvget_wstr(int y, int x, wint_t *wstr);
       int mvgetn_wstr(int y, int x, wint_t *wstr, int n);
       int mvwget_wstr(WINDOW *win, int y, int x, wint_t *wstr);
       int mvwgetn_wstr(WINDOW *win, int y, int x, wint_t *wstr, int n);

DESCRIPTION         top

       The effect of get_wstr is as though a series of calls to get_wch(3X)
       were made, until a newline, other end-of-line, or end-of-file
       condition is processed.  An end-of-file condition is represented by
       WEOF, as defined in <wchar.h>.  The newline and end-of-line
       conditions are represented by the \n wchar_t value.  In all
       instances, the end of the string is terminated by a null wchar_t.
       The routine places resulting values in the area pointed to by wstr.

       The user's erase and kill characters are interpreted.  If keypad mode
       is on for the window, KEY_LEFT and KEY_BACKSPACE are both considered
       equivalent to the user's kill character.

       Characters input are echoed only if echo is currently on.  In that
       case, backspace is echoed as deletion of the previous character
       (typically a left motion).

       The effect of wget_wstr is as though a series of calls to wget_wch
       were made.

       The effect of mvget_wstr is as though a call to move and then a
       series of calls to get_wch were made.

       The effect of mvwget_wstr is as though a call to wmove and then a
       series of calls to wget_wch were made.

       The getn_wstr, mvgetn_wstr, mvwgetn_wstr, and wgetn_wstr functions
       are identical to the get_wstr, mvget_wstr, mvwget_wstr, and wget_wstr
       functions, respectively, except that the *n_* versions read at most n
       characters, letting the application prevent overflow of the input

NOTES         top

       Using get_wstr, mvget_wstr, mvwget_wstr, or wget_wstr to read a line
       that overflows the array pointed to by wstr causes undefined results.
       The use of getn_wstr, mvgetn_wstr, mvwgetn_wstr, or wgetn_wstr,
       respectively, is recommended.

       These functions cannot return KEY_ values because there is no way to
       distinguish a KEY_ value from a valid wchar_t value.

       All of these routines except wgetn_wstr may be macros.

RETURN VALUE         top

       All of these functions return OK upon successful completion.
       Otherwise, they return ERR.

       Functions using a window parameter return an error if it is null.

                   returns an error if the associated call to wget_wch

       Functions with a “mv” prefix first perform a cursor movement using
       wmove, and return an error if the position is outside the window, or
       if the window pointer is null.

PORTABILITY         top

       These functions are described in The Single Unix Specification,
       Version 2.  No error conditions are defined.  This implementation
       returns ERR if the window pointer is null, or if the lower-level
       wget_wch call returns an ERR.  In the latter case, an ERR return
       without other data is treated as an end-of-file condition, and the
       returned array contains a WEOF followed by a null wchar_t.

       X/Open curses documented these functions to pass an array of wchar_t
       in 1997, but that was an error because of this part of the

              The effect of get_wstr() is as though a series of calls to
              get_wch() were made, until a newline character, end-of-line
              character, or end-of-file character is processed.

       The latter function get_wch() can return a negative value, while
       wchar_t is a unsigned type.  All of the vendors implement this using
       wint_t, following the standard.

       X/Open Curses, Issue 7 (2009) is unclear regarding whether the
       terminating null wchar_t value is counted in the length parameter n.
       X/Open Curses, Issue 7 revised the corresponding description of
       wgetnstr to address this issue.  The unrevised description of
       wget_nwstr can be interpreted either way.  This implementation counts
       the terminator in the length.

       X/Open Curses does not specify what happens if the length n is

       ·   For analogy with wgetnstr, ncurses 6.2 uses a limit (based on

       ·   Some other implementations (such as Solaris xcurses) do the same,
           while others (PDCurses) do not allow this.

       ·   NetBSD 7 curses imitates ncurses 6.1 in this regard, treating a
           -1 as an indefinite number of characters.

SEE ALSO         top

       Functions: curses(3X), curs_get_wch(3X), curs_getstr(3X).

COLOPHON         top

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