ncurses (6.4)
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Usage
Versionscurs_get_wstr(3X) curs_get_wstr(3X)
NAME
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
#include <ncurses/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
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, let‐
ting the application prevent overflow of the input buffer.
NOTES
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 rec‐
ommended.
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
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.
wgetn_wstr
returns an error if the associated call to wget_wch failed.
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
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 re‐
turned 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 description:
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 is‐
sue. The unrevised description of wget_nwstr can be interpreted either way. This implementation counts the ter‐
minator in the length.
X/Open Curses does not specify what happens if the length n is negative.
• For analogy with wgetnstr, ncurses 6.2 uses a limit (based on LINE_MAX).
• 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
Functions: curses(3X), curs_get_wch(3X), curs_getstr(3X).
curs_get_wstr(3X)
NAME
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
#include <ncurses/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
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, let‐
ting the application prevent overflow of the input buffer.
NOTES
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 rec‐
ommended.
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
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.
wgetn_wstr
returns an error if the associated call to wget_wch failed.
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
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 re‐
turned 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 description:
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 is‐
sue. The unrevised description of wget_nwstr can be interpreted either way. This implementation counts the ter‐
minator in the length.
X/Open Curses does not specify what happens if the length n is negative.
• For analogy with wgetnstr, ncurses 6.2 uses a limit (based on LINE_MAX).
• 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
Functions: curses(3X), curs_get_wch(3X), curs_getstr(3X).
curs_get_wstr(3X)