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29 .\" $Id: curs_get_wstr.3x,v 1.19 2019/11/30 20:59:22 tom Exp $
30 .TH curs_get_wstr 3X ""
49 \fBmvwgetn_wstr\fR \- get an array of wide characters from a curses terminal keyboard
54 \fB#include <curses.h>\fR
56 \fBint get_wstr(wint_t *\fR\fIwstr\fR\fB);\fR
58 \fBint getn_wstr(wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
60 \fBint wget_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
62 \fBint wgetn_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
64 \fBint mvget_wstr(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
66 \fBint mvgetn_wstr(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
68 \fBint mvwget_wstr(WINDOW *\fR\fIwin\fR\fB, int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
70 \fBint mvwgetn_wstr(WINDOW *\fR\fIwin\fR\fB, int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
75 is as though a series of calls
78 were made, until a newline, other end-of-line,
79 or end-of-file condition is processed.
80 An end-of-file condition is represented by \fBWEOF\fR,
81 as defined in \fB<wchar.h>\fR.
82 The newline and end-of-line conditions are represented
83 by the \fB\\n\fR \fBwchar_t\fR value.
84 In all instances, the end of the string is terminated by a null \fBwchar_t\fR.
85 The routine places resulting values in the area pointed to by \fIwstr\fR.
87 The user's erase and kill characters are interpreted.
89 mode is on for the window, \fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
90 are both considered equivalent to the user's kill character.
92 Characters input are echoed only if \fBecho\fR is currently on.
94 backspace is echoed as deletion of the previous character (typically a left
99 is as though a series of
106 is as though a call to
108 and then a series of calls to
115 is as though a call to
117 and then a series of calls to
124 \fBmvwgetn_wstr\fR, and
126 functions are identical
130 \fBmvwget_wstr\fR, and
132 functions, respectively,
135 versions read at most
137 characters, letting the application prevent overflow of the
143 \fBmvwget_wstr\fR, or
146 overflows the array pointed to by
153 \fBmvwgetn_wstr\fR, or
154 \fBwgetn_wstr\fR, respectively, is recommended.
156 These functions cannot return \fBKEY_\fR values because there
157 is no way to distinguish a \fBKEY_\fR value from a valid \fBwchar_t\fR value.
159 All of these routines except \fBwgetn_wstr\fR may be macros.
161 All of these functions return \fBOK\fR upon successful completion.
162 Otherwise, they return \fBERR\fR.
164 Functions using a window parameter return an error if it is null.
168 returns an error if the associated call to \fBwget_wch\fP failed.
171 Functions with a \*(``mv\*('' prefix first perform a cursor movement using
172 \fBwmove\fP, and return an error if the position is outside the window,
173 or if the window pointer is null.
175 These functions are described in The Single Unix Specification, Version 2.
176 No error conditions are defined.
177 This implementation returns \fBERR\fP if the window pointer is null,
178 or if the lower-level \fBwget_wch\fR call returns an \fBERR\fP.
180 an \fBERR\fP return without other data is treated as an end-of-file condition,
181 and the returned array contains a \fBWEOF\fR followed by a null \fBwchar_t\fR.
183 X/Open curses documented these functions to pass an array of \fBwchar_t\fR
184 in 1997, but that was an error because of this part of the description:
187 The effect of \fIget_wstr()\fP is as though a series of calls to
188 \fIget_wch()\fP were made, until a newline character, end-of-line character, or
189 end-of-file character is processed.
192 The latter function \fIget_wch()\fP can return a negative value,
193 while \fBwchar_t\fP is a unsigned type.
194 All of the vendors implement this using \fBwint_t\fR, following the standard.
196 X/Open Curses, Issue 7 (2009) is unclear regarding whether
197 the terminating \fInull \fP\fBwchar_t\fP
198 value is counted in the length parameter \fIn\fP.
199 X/Open Curses, Issue 7 revised the corresponding description
200 of \fBwgetnstr\fP to address this issue.
201 The unrevised description of \fBwget_nwstr\fP can be interpreted either way.
202 This implementation counts the terminator in the length.
204 X/Open Curses does not specify what happens if the length \fIn\fP is negative.
206 For analogy with \fBwgetnstr\fP,
207 ncurses 6.2 uses a limit (based on \fBLINE_MAX\fP).
209 Some other implementations (such as Solaris xcurses) do the same,
210 while others (PDCurses) do not allow this.
212 NetBSD 7 curses imitates ncurses 6.1 in this regard,
213 treating a \fB\-1\fP as an indefinite number of characters.
217 \fBcurs_get_wch\fR(3X),
218 \fBcurs_getstr\fR(3X).