The addch, waddch, mvaddch and mvwaddch routines put the
character ch into the given window at its current window
position, which is then advanced. They are analogous to
- putchar in stdio(3). If the advance is at the right mar-
- gin, the cursor automatically wraps to the beginning of
- the next line. At the bottom of the current scrolling
- region, if scrollok is enabled, the scrolling region is
- scrolled up one line.
-
- If ch is a tab, newline, or backspace, the cursor is moved
- appropriately within the window. Backspace moves the cur-
- sor one character left; at the left edge of a window it
- does nothing. Newline does a clrtoeol, then moves the
- cursor to the window left margin on the next line,
- scrolling the window if on the last line. Tabs are con-
- sidered to be at every eighth column. The tab interval
- may be altered by setting the TABSIZE variable.
-
- If ch is any control character other than tab, newline, or
- backspace, it is drawn in ^X notation. Calling winch
- after adding a control character does not return the char-
- acter itself, but instead returns the ^-representation of
- the control character.
+ putchar in stdio(3). If the advance is at the right mar-
+ gin:
+
+ o The cursor automatically wraps to the beginning of the
+ next line.
+
+ o At the bottom of the current scrolling region, and if
+ scrollok is enabled, the scrolling region is scrolled
+ up one line.
+
+ o If scrollok is not enabled, writing a character at the
+ lower right margin succeeds. However, an error is
+ returned because it is not possible to wrap to a new
+ line
+
+ If ch is a tab, newline, carriage return or backspace, the
+ cursor is moved appropriately within the window:
+
+ o Backspace moves the cursor one character left; at the
+ left edge of a window it does nothing.
+
+ o Carriage return moves the cursor to the window left
+ margin on the current line.
+
+ o Newline does a clrtoeol, then moves the cursor to the
+ window left margin on the next line, scrolling the
+ window if on the last line.
+
+ o Tabs are considered to be at every eighth column. The
+ tab interval may be altered by setting the TABSIZE
+ variable.
+
+ If ch is any other control character, it is drawn in ^X
+ notation. Calling winch after adding a control character
+ does not return the character itself, but instead returns
+ the ^-representation of the control character.
Video attributes can be combined with a character argument
passed to addch or related functions by logical-ORing them
@@ -107,14 +123,15 @@
may be seen by using these routines instead of their
equivalents.
- LineGraphics
+
+
The following variables may be used to add line drawing
characters to the screen with routines of the addch fam-
ily. The default character listed below is used if the
- acsc capability doesn't define a terminal-specific
- replacement for it (but see the EXTENSIONS section below).
- The names are taken from VT100 nomenclature.
-
+ acsc capability does not define a terminal-specific
+ replacement for it. The names are taken from VT100 nomen-
+ clature.
NameDefaultDescription
--------------------------------------------------
@@ -153,55 +170,78 @@
All routines return the integer ERR upon failure and OK on
success (the SVr4 manuals specify only "an integer value
other than ERR") upon successful completion, unless other-
wise noted in the preceding routine descriptions.
+ Functions with a "mv" prefix first perform a cursor move-
+ ment using wmove, and return an error if the position is
+ outside the window, or if the window pointer is null.
+
All these functions are described in the XSI Curses stan-
dard, Issue 4. The defaults specified for forms-drawing
characters apply in the POSIX locale.
- Some ACS symbols (ACS_S3, ACS_S7, ACS_LEQUAL, ACS_GEQUAL,
- ACS_PI, ACS_NEQUAL, ACS_STERLING) were not documented in
- any publicly released System V. However, many publicly
- available terminfos include acsc strings in which their
- key characters (pryz{|}) are embedded, and a second-hand
- list of their character descriptions has come to light.
- The ACS-prefixed names for them were invented for
+ X/Open Curses states that the ACS_ definitions are char
+ constants. For the wide-character implementation (see
+ curs_add_wch), there are analogous WACS_ definitions which
+ are cchar_t constants.
+
+ Some ACS symbols (ACS_S3, ACS_S7, ACS_LEQUAL, ACS_GEQUAL,
+ ACS_PI, ACS_NEQUAL, ACS_STERLING) were not documented in
+ any publicly released System V. However, many publicly
+ available terminfos include acsc strings in which their
+ key characters (pryz{|}) are embedded, and a second-hand
+ list of their character descriptions has come to light.
+ The ACS-prefixed names for them were invented for
ncurses(3x).
- The TABSIZE variable is implemented in some versions of
+ The TABSIZE variable is implemented in some versions of
curses, but is not part of X/Open curses.
- If ch is a carriage return, the cursor is moved to the
- beginning of the current row of the window. This is true
+ If ch is a carriage return, the cursor is moved to the
+ beginning of the current row of the window. This is true
of other implementations, but is not documented.