.\" $OpenBSD: curs_addch.3tbl,v 1.3 1997/12/03 05:45:07 millert Exp $ '\" t .TH curs_addch 3 "" .SH NAME \fBaddch\fR, \fBwaddch\fR, \fBmvaddch\fR, \fBmvwaddch\fR, \fBechochar\fR, \fBwechochar\fR - add a character (with attributes) to a \fBcurses\fR window, then advance the cursor .SH SYNOPSIS \fB#include \fR \fBint addch(chtype ch);\fR .br \fBint waddch(WINDOW *win, chtype ch);\fR .br \fBint mvaddch(int y, int x, chtype ch);\fR .br \fBint mvwaddch(WINDOW *win, int y, int x, chtype ch);\fR .br \fBint echochar(chtype ch);\fR .br \fBint wechochar(WINDOW *win, chtype ch);\fR .br .SH DESCRIPTION The \fBaddch\fR, \fBwaddch\fR, \fBmvaddch\fR and \fBmvwaddch\fR routines put the character \fIch\fR into the given window at its current window position, which is then advanced. They are analogous to \fBputchar\fR in \fBstdio\fR(3). If the advance is at the right margin, the cursor automatically wraps to the beginning of the next line. At the bottom of the current scrolling region, if \fBscrollok\fR is enabled, the scrolling region is scrolled up one line. If \fIch\fR is a tab, newline, or backspace, the cursor is moved appropriately within the window. Backspace moves the cursor one character left; at the left edge of a window it does nothing. Newline does a \fBclrtoeol\fR, then moves the cursor to the window left margin on the next line, scrolling the window if on the last line). Tabs are considered to be at every eighth column. If \fIch\fR is any control character other than tab, newline, or backspace, it is drawn in \fB^\fR\fIX\fR notation. Calling \fBwinch\fR after adding a control character does not return the character itself, but instead returns the ^-representation of the control character. (To emit control characters literally, use \fBechochar\fR.) Video attributes can be combined with a character argument passed to \fBaddch\fR or related functions by logical-ORing them into the character. (Thus, text, including attributes, can be copied from one place to another using \fBinch\fR and \fBaddch\fR.). See the \fBcurs_attr\fR(3) page for values of predefined video attribute constants that can be usefully OR'ed into characters. The \fBechochar\fR and \fBwechochar\fR routines are equivalent to a call to \fBaddch\fR followed by a call to \fBrefresh\fR, or a call to \fBwaddch\fR followed by a call to \fBwrefresh\fR. The knowledge that only a single character is being output is used and, for non-control characters, a considerable performance gain may be seen by using these routines instead of their equivalents. .SS Line Graphics The following variables may be used to add line drawing characters to the screen with routines of the \fBaddch\fR family. The default character listed below is used if the \fBacsc\fR capability doesn't define a terminal-specific replacement for it (but see the EXTENSIONS section below). The names are taken from VT100 nomenclature. .TS l l l _ _ _ l l l. \fIName\fR \fIDefault\fR \fIDescription\fR ACS_ULCORNER + upper left-hand corner ACS_LLCORNER + lower left-hand corner ACS_URCORNER + upper right-hand corner ACS_LRCORNER + lower right-hand corner ACS_RTEE + right tee ACS_LTEE + left tee ACS_BTEE + bottom tee ACS_TTEE + top tee ACS_HLINE - horizontal line ACS_VLINE | vertical line ACS_PLUS + plus ACS_S1 - scan line 1 ACS_S9 \&_ scan line 9 ACS_DIAMOND + diamond ACS_CKBOARD : checker board (stipple) ACS_DEGREE ' degree symbol ACS_PLMINUS # plus/minus ACS_BULLET o bullet ACS_LARROW < arrow pointing left ACS_RARROW > arrow pointing right ACS_DARROW v arrow pointing down ACS_UARROW ^ arrow pointing up ACS_BOARD # board of squares ACS_LANTERN # lantern symbol ACS_BLOCK # solid square block ACS_S3 - scan line 3 ACS_S7 - scan line 7 ACS_LEQUAL < less-than-or-equal-to ACS_GEQUAL > greater-than-or-equal-to ACS_PI * greek pi ACS_NEQUAL ! not-equal ACS_STERLING f pound-sterling symbol .TE .SH RETURN VALUE All routines return the integer \fBERR\fR upon failure and \fBOK\fR on success (the SVr4 manuals specify only "an integer value other than \fBERR\fR") upon successful completion, unless otherwise noted in the preceding routine descriptions. .SH NOTES Note that \fBaddch\fR, \fBmvaddch\fR, \fBmvwaddch\fR, and \fBechochar\fR may be macros. .SH EXTENSIONS The following extended \fBcurses\fR features are available only on PC-clone consoles and compatible terminals obeying the ANSI.SYS de-facto standard for terminal control sequences. They are not part of XSI curses. The attribute A_ALTCHARSET actually forces literal display of PC ROM characters including the high-half graphics. Your console driver may still capture or translate a few (such as ESC) but this feature should give you access to the card-suit characters, up and down-arrow, and most others in the range 0-32. (In a terminfo entry designed for use with \fBcurses\fR, the high-half characters are obtained using this attribute with an \fBacsc\fR string in which the second of each pair is a high-half character.) Giving \fBwechochar\fR an argument with its high bit set will produce the corresponding high-half ASCII graphic (SVr4 curses also has this feature but does not document it). A control-character argument, however, will not typically produce the corresponding graphic; characters such as CR, NL, FF and TAB are typically interpreted by the console driver itself, and ESC will be interpreted as the leader of a control sequence. .SH PORTABILITY All these functions are described in the XSI Curses standard, Issue 4. The defaults specified for forms-drawing characters apply in the POSIX locale. The seven ACS symbols starting with \fBACS_S3\fR were not documented in any publicly released System V. However, many publicly available terminfos include \fBacsc\fR 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 \fBcurses\fR(3). .SH SEE ALSO \fBcurses\fR(3), \fBcurs_attr\fR(3), \fBcurs_clear\fR(3), \fBcurs_inch\fR(3), \fBcurs_outopts\fR(3), \fBcurs_refresh\fR(3), \fBputc\fR(3S). .\"# .\"# The following sets edit modes for GNU EMACS .\"# Local Variables: .\"# mode:nroff .\"# fill-column:79 .\"# End: