ncurses 6.2 - patch 20210626

[ncurses.git] / man / curs_getstr.3x

diff --git a/man/curs_getstr.3x b/man/curs_getstr.3x
index d9bed5958976a9ba009629519844dae38261614d..4a1cc89173f77ef38b7826c93cac90ea6171c091 100644 (file)
--- a/man/curs_getstr.3x
+++ b/man/curs_getstr.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright 2018-2019,2020 Thomas E. Dickey                                *
+.\" Copyright 2018-2020,2021 Thomas E. Dickey                                *

 .\" Copyright 1998-2010,2017 Free Software Foundation, Inc.                  *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" Copyright 1998-2010,2017 Free Software Foundation, Inc.                  *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *


@@ -27,7 +27,7 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_getstr.3x,v 1.29 2020/02/02 23:34:34 tom Exp $
+.\" $Id: curs_getstr.3x,v 1.33 2021/05/22 21:36:35 tom Exp $

 .TH curs_getstr 3X ""
 .ie \n(.g .ds `` \(lq
 .el       .ds `` ``
 .TH curs_getstr 3X ""
 .ie \n(.g .ds `` \(lq
 .el       .ds `` ``


@@ -53,21 +53,21 @@
 .SH SYNOPSIS
 \fB#include <curses.h>\fR
 .sp
 .SH SYNOPSIS
 \fB#include <curses.h>\fR
 .sp

-\fBint getstr(char *str);\fR
+\fBint getstr(char *\fP\fIstr\fP\fB);\fR

 .br
 .br

-\fBint getnstr(char *str, int n);\fR
+\fBint getnstr(char *\fP\fIstr\fP\fB, int \fP\fIn\fP\fB);\fR

 .br
 .br

-\fBint wgetstr(WINDOW *win, char *str);\fR
+\fBint wgetstr(WINDOW *\fP\fIwin\fP\fB, char *\fP\fIstr\fP\fB);\fR

 .br
 .br

-\fBint wgetnstr(WINDOW *win, char *str, int n);\fR
-.br
-\fBint mvgetstr(int y, int x, char *str);\fR
+\fBint wgetnstr(WINDOW *\fP\fIwin\fP\fB, char *\fP\fIstr\fP\fB, int \fP\fIn\fP\fB);\fR
+.sp
+\fBint mvgetstr(int \fP\fIy\fP\fB, int \fP\fIx\fP\fB, char *\fP\fIstr\fP\fB);\fR

 .br
 .br

-\fBint mvwgetstr(WINDOW *win, int y, int x, char *str);\fR
+\fBint mvwgetstr(WINDOW *\fP\fIwin\fP\fB, int \fP\fIy\fP\fB, int \fP\fIx\fP\fB, char *\fP\fIstr\fP\fB);\fR

 .br
 .br

-\fBint mvgetnstr(int y, int x, char *str, int n);\fR
+\fBint mvgetnstr(int \fP\fIy\fP\fB, int \fP\fIx\fP\fB, char *\fP\fIstr\fP\fB, int \fP\fIn\fP\fB);\fR

 .br
 .br

-\fBint mvwgetnstr(WINDOW *, int y, int x, char *str, int n);\fR
+\fBint mvwgetnstr(WINDOW *\fP\fIwin\fP\fB, int \fP\fIy\fP\fB, int \fP\fIx\fP\fB, char *\fP\fIstr\fP\fB, int \fP\fIn\fP\fB);\fR

 .br
 .SH DESCRIPTION
 The function \fBgetstr\fR is equivalent to a series of calls to \fBgetch\fR,
 .br
 .SH DESCRIPTION
 The function \fBgetstr\fR is equivalent to a series of calls to \fBgetch\fR,


@@ -80,19 +80,29 @@ The resulting value is placed in the
 area pointed to by the character pointer \fIstr\fR,
 followed by a NUL.
 .PP
 area pointed to by the character pointer \fIstr\fR,
 followed by a NUL.
 .PP

-\fBwgetnstr\fR reads at most \fIn\fR characters, thus preventing a possible
+The \fBgetnstr\fR function reads
+from the \fIstdscr\fR default window.
+The other functions, such as \fBwgetnstr\fP,
+read from the window given as a parameter.
+.PP
+\fBgetnstr\fR reads at most \fIn\fR characters, thus preventing a possible

 overflow of the input buffer.
 Any attempt to enter more characters (other
 than the terminating newline or carriage return) causes a beep.
 Function
 keys also cause a beep and are ignored.
 overflow of the input buffer.
 Any attempt to enter more characters (other
 than the terminating newline or carriage return) causes a beep.
 Function
 keys also cause a beep and are ignored.

-The \fBgetnstr\fR function reads
-from the \fIstdscr\fR default window.

 .PP
 .PP

-The user's erase and kill characters are interpreted.
-If keypad
-mode is on for the window, \fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
-are both considered equivalent to the user's kill character.
+The user's \fIerase\fP and \fIkill\fP characters are interpreted:
+.bP
+The \fIerase\fP character (e.g., \fB^H\fP) erases the character
+at the end of the buffer, moving the cursor to the left.
+.IP
+If \fIkeypad\fP mode is on for the window,
+\fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
+are both considered equivalent to the user's erase character.
+.bP
+The \fIkill\fP character (e.g., \fB^U\fP) erases the entire buffer,
+leaving the cursor at the beginning of the buffer.

 .PP
 Characters input are echoed only if \fBecho\fR is currently on.
 In that case,
 .PP
 Characters input are echoed only if \fBecho\fR is currently on.
 In that case,


@@ -187,7 +197,50 @@ which the \fBsysconf\fP function may provide.
 If neither \fBLINE_MAX\fP or \fBsysconf\fP is available,
 ncurses uses the POSIX value for \fBLINE_MAX\fP (a 2048 byte limit).
 In either case, it reserves a byte for the terminating NUL.
 If neither \fBLINE_MAX\fP or \fBsysconf\fP is available,
 ncurses uses the POSIX value for \fBLINE_MAX\fP (a 2048 byte limit).
 In either case, it reserves a byte for the terminating NUL.

+.PP
+Although \fBgetnstr\fP is equivalent to a series of calls to \fBgetch\fP,
+it also makes changes to the curses modes to allow simple editing of
+the input buffer:
+.bP
+\fBgetnstr\fP saves the current value of the \fBnl\fP, \fBecho\fP,
+\fBraw\fP and \fBcbreak\fP modes, and sets
+\fBnl\fP,
+\fBnoecho\fP,
+\fBnoraw\fP, and
+\fBcbreak\fP.
+.IP
+\fBgetnstr\fP handles the echoing of characters,
+rather than relying on the caller to set an appropriate mode.
+.bP
+It also obtains the \fIerase\fP and \fIkill\fP characters
+from \fBerasechar\fP and \fBkillchar\fP, respectively.
+.bP
+On return, \fBgetnstr\fP restores the modes to their previous values.
+.PP
+Other implementations differ in their treatment of special characters:
+.bP
+While they may set the \fIecho\fP mode,
+other implementations do not modify the \fIraw\fP mode,
+They may take the \fIcbreak\fP
+mode set by the caller into account when deciding whether to handle
+echoing within \fBgetnstr\fP or as a side-effect of the \fBgetch\fP calls.
+.bP
+The original ncurses (as pcurses in 1986) set \fBnoraw\fP and \fBcbreak\fP
+when accepting input for \fBgetnstr\fP.
+That may have been done to make function- and cursor-keys work;
+it is not necessary with ncurses.
+.IP
+Since 1995, ncurses has provided signal handlers for INTR and QUIT
+(e.g., \fB^C\fP or \fB^\\\fP).
+With the \fBnoraw\fP and \fBcbreak\fP settings,
+those may catch a signal and stop the program,
+where other implementations allow one to enter those characters in the buffer.
+.bP
+Starting in 2021 (ncurses 6.3), \fBgetnstr\fP sets \fBraw\fP,
+rather than \fBnoraw\fP and \fBcbreak\fP for better compatibility with
+SVr4-curses, e.g., allowing one to enter a \fB^C\fP into the buffer.

 .SH SEE ALSO
 \fBcurses\fR(3X),
 \fBcurs_getch\fR(3X),
 .SH SEE ALSO
 \fBcurses\fR(3X),
 \fBcurs_getch\fR(3X),

+\fBcurs_termattrs\fR(3X),

 \fBcurs_variables\fR(3X).
 \fBcurs_variables\fR(3X).