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.\" $Id: curs_instr.3x,v 1.18 2017/11/18 23:47:37 tom Exp $
.TH instr 3NCURSES ""
.ie \n(.g .ds `` \(lq
.el       .ds `` ``
.ie \n(.g .ds '' \(rq
.el       .ds '' ''
.de bP
.ie n  .IP \(bu 4
.el    .IP \(bu 2
..
.SH NAME
\fBinstr\fR,
\fBinnstr\fR,
\fBwinstr\fR,
\fBwinnstr\fR,
\fBmvinstr\fR,
\fBmvinnstr\fR,
\fBmvwinstr\fR,
\fBmvwinnstr\fR \- get a string of characters from a \fBcurses\fR window
.SH SYNOPSIS
\fB#include <ncursesw/curses.h>\fR
.sp
\fBint instr(char *str);\fR
.br
\fBint innstr(char *str, int n);\fR
.br
\fBint winstr(WINDOW *win, char *str);\fR
.br
\fBint winnstr(WINDOW *win, char *str, int n);\fR
.br
\fBint mvinstr(int y, int x, char *str);\fR
.br
\fBint mvinnstr(int y, int x, char *str, int n);\fR
.br
\fBint mvwinstr(WINDOW *win, int y, int x, char *str);\fR
.br
\fBint mvwinnstr(WINDOW *win, int y, int x, char *str, int n);\fR
.br
.SH DESCRIPTION
These routines return a string of characters in \fIstr\fR, extracted starting
at the current cursor position in the named window.
Attributes are stripped from the characters.  The four
functions with \fIn\fR as the last argument return a leading substring at most
\fIn\fR characters long (exclusive of the trailing NUL).
.SH RETURN VALUE
All of the functions return \fBERR\fR upon failure,
or the number of characters actually read into the string.
.PP
X/Open Curses defines no error conditions.
In this implementation:
.bP
If the \fIwin\fP parameter is null, an error is returned,
.bP
If the \fIchstr\fP parameter is null, an error is returned,
.PP
Functions with a \*(``mv\*('' prefix first perform a cursor movement using
\fBwmove\fP, and return an error if the position is outside the window,
or if the window pointer is null.
.SH NOTES
Note that all routines except \fBwinnstr\fR may be macros.
.SH PORTABILITY
SVr4 does not
document whether a length limit includes or excludes the trailing NUL.
.PP
The ncurses library extends the XSI description by allowing a negative
value for \fIn\fR.
In this case, the functions return the string ending at the right margin.
.SH SEE ALSO
\fBncurses\fR(3NCURSES).