path: root/man/curs_clear.3x
diff options
Diffstat (limited to 'man/curs_clear.3x')
1 files changed, 24 insertions, 12 deletions
diff --git a/man/curs_clear.3x b/man/curs_clear.3x
index 2cce06ea489a..d86acbde6b00 100644
--- a/man/curs_clear.3x
+++ b/man/curs_clear.3x
@@ -27,10 +27,14 @@
.\" authorization. *
-.\" $Id: curs_clear.3x,v 1.17 2020/02/02 23:34:34 tom Exp $
+.\" $Id: curs_clear.3x,v 1.20 2020/10/24 09:19:37 tom Exp $
.TH curs_clear 3X ""
.hy 0
+.de bP
+.ie n .IP \(bu 4
+.el .IP \(bu 2
@@ -43,23 +47,23 @@
-\fB# include <curses.h>\fR
+\fB#include <curses.h>\fR
\fBint erase(void);\fR
-\fBint werase(WINDOW *win);\fR
+\fBint werase(WINDOW *\fP\fIwin\fP\fB);\fR
\fBint clear(void);\fR
-\fBint wclear(WINDOW *win);\fR
+\fBint wclear(WINDOW *\fP\fIwin\fP\fB);\fR
\fBint clrtobot(void);\fR
-\fBint wclrtobot(WINDOW *win);\fR
+\fBint wclrtobot(WINDOW *\fP\fIwin\fP\fB);\fR
\fBint clrtoeol(void);\fR
-\fBint wclrtoeol(WINDOW *win);\fR
+\fBint wclrtoeol(WINDOW *\fP\fIwin\fP\fB);\fR
The \fBerase\fR and \fBwerase\fR routines copy blanks to every
@@ -82,12 +86,14 @@ Blanks created by erasure have the current background rendition (as set
by \fBwbkgdset\fR) merged into them.
All routines return the integer \fBOK\fR on success and \fBERR\fP on failure.
-The SVr4.0 manual says "or a
-non-negative integer if \fBimmedok\fR is set", but this appears to be an error.
X/Open defines no error conditions.
In this implementation,
-functions using a window pointer parameter return an error if it is null.
+functions using a window pointer parameter return an error if it is null
+\fBwclrtoeol\fP returns an error
+if the cursor position is about to wrap.
Note that \fBerase\fR, \fBwerase\fR, \fBclear\fR, \fBwclear\fR,
\fBclrtobot\fR, and \fBclrtoeol\fR may be macros.
@@ -97,6 +103,12 @@ The
standard specifies that they return \fBERR\fR on failure, but specifies no
error conditions.
+The SVr4.0 manual says that these functions could
+return "a non-negative integer if \fBimmedok\fR is set",
+referring to the return-value of \fBwrefresh\fP.
+In that implementation, \fBwrefresh\fP would return a count of
+the number of characters written to the terminal.
Some historic curses implementations had, as an undocumented feature, the
ability to do the equivalent of \fBclearok(..., 1)\fR by saying
\fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR.