X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=man%2Fcurs_add_wch.3x;h=ed97099f6a70643eb3753e55b37d47b2766f8aae;hp=adcf5e84f3c1cf54f97eb5b5d950a527308417c7;hb=5c2245b6fc619f8d96ce940281dfbf13b5b8900b;hpb=58552e8c761a70f8f0bd591fecdf576fa8216e3e

diff --git a/man/curs_add_wch.3x b/man/curs_add_wch.3x
index adcf5e84..ed97099f 100644
--- a/man/curs_add_wch.3x
+++ b/man/curs_add_wch.3x
@@ -26,8 +26,12 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: curs_add_wch.3x,v 1.17 2017/01/07 19:25:15 tom Exp $
+.\" $Id: curs_add_wch.3x,v 1.23 2017/05/20 14:45:24 Sven.Joachim Exp $
 .TH curs_add_wch 3X ""
+.ie \n(.g .ds `` \(lq
+.el       .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el       .ds '' ''
 .de bP
 .IP \(bu 4
 ..
@@ -109,80 +113,94 @@ These symbols correspond to the same VT100 line-drawing set as
 \fBaddch\fP(3X).
 .PP
 .TS
-l l l l
-_ _ _ _
-lw(1.5i) lw7 lw7 lw20.
-\fIName\fR	\fIUnicode\fP	\fIDefault\fR	\fIDescription\fR
-WACS_BLOCK	0x25ae 	#	solid square block
-WACS_BOARD	0x2592 	#	board of squares
-WACS_BTEE	0x2534 	+	bottom tee
-WACS_BULLET	0x00b7 	o	bullet
-WACS_CKBOARD	0x2592 	:	checker board (stipple)
-WACS_DARROW	0x2193 	v	arrow pointing down
-WACS_DEGREE	0x00b0 	'	degree symbol
-WACS_DIAMOND	0x25c6 	+	diamond
-WACS_GEQUAL	0x2265 	>	greater-than-or-equal-to
-WACS_HLINE	0x2500 	\-	horizontal line
-WACS_LANTERN	0x2603 	#	lantern symbol
-WACS_LARROW	0x2190 	<	arrow pointing left
-WACS_LEQUAL	0x2264 	<	less-than-or-equal-to
-WACS_LLCORNER	0x2514 	+	lower left-hand corner
-WACS_LRCORNER	0x2518 	+	lower right-hand corner
-WACS_LTEE	0x2524 	+	left tee
-WACS_NEQUAL	0x2260 	!	not-equal
-WACS_PI	0x03c0 	*	greek pi
-WACS_PLMINUS	0x00b1 	#	plus/minus
-WACS_PLUS	0x253c 	+	plus
-WACS_RARROW	0x2192 	>	arrow pointing right
-WACS_RTEE	0x251c 	+	right tee
-WACS_S1	0x23ba 	\-	scan line 1
-WACS_S3	0x23bb 	\-	scan line 3
-WACS_S7	0x23bc 	\-	scan line 7
-WACS_S9	0x23bd 	\&_	scan line 9
-WACS_STERLING	0x00a3 	f	pound-sterling symbol
-WACS_TTEE	0x252c 	+	top tee
-WACS_UARROW	0x2191  	^	arrow pointing up
-WACS_ULCORNER	0x250c 	+	upper left-hand corner
-WACS_URCORNER	0x2510 	+	upper right-hand corner
-WACS_VLINE	0x2502 	|	vertical line
+l l l l l
+l l l l l
+_ _ _ _ _
+lw(1.5i) lw5 lw5 lw5 lw20.
+\fBACS\fR	\fBUnicode\fP	\fBASCII\fR	\fBacsc\fP	\fBGlyph\fR
+\fBName\fR	\fBDefault\fP	\fBDefault\fR	\fBchar\fP	\fBName\fR
+WACS_BLOCK	0x25ae 	#	0	solid square block
+WACS_BOARD	0x2592 	#	h	board of squares
+WACS_BTEE	0x2534 	+	v	bottom tee
+WACS_BULLET	0x00b7 	o	~	bullet
+WACS_CKBOARD	0x2592 	:	a	checker board (stipple)
+WACS_DARROW	0x2193 	v	.	arrow pointing down
+WACS_DEGREE	0x00b0 	'	f	degree symbol
+WACS_DIAMOND	0x25c6 	+	`	diamond
+WACS_GEQUAL	0x2265 	>	>	greater-than-or-equal-to
+WACS_HLINE	0x2500 	\-	q	horizontal line
+WACS_LANTERN	0x2603 	#	i	lantern symbol
+WACS_LARROW	0x2190 	<	,	arrow pointing left
+WACS_LEQUAL	0x2264 	<	y	less-than-or-equal-to
+WACS_LLCORNER	0x2514 	+	m	lower left-hand corner
+WACS_LRCORNER	0x2518 	+	j	lower right-hand corner
+WACS_LTEE	0x2524 	+	t	left tee
+WACS_NEQUAL	0x2260 	!	|	not-equal
+WACS_PI	0x03c0 	*	{	greek pi
+WACS_PLMINUS	0x00b1 	#	g	plus/minus
+WACS_PLUS	0x253c 	+	n	plus
+WACS_RARROW	0x2192 	>	+	arrow pointing right
+WACS_RTEE	0x251c 	+	u	right tee
+WACS_S1	0x23ba 	\-	o	scan line 1
+WACS_S3	0x23bb 	\-	p	scan line 3
+WACS_S7	0x23bc 	\-	r	scan line 7
+WACS_S9	0x23bd 	\&_	s	scan line 9
+WACS_STERLING	0x00a3 	f	}	pound-sterling symbol
+WACS_TTEE	0x252c 	+	w	top tee
+WACS_UARROW	0x2191  	^	\-	arrow pointing up
+WACS_ULCORNER	0x250c 	+	l	upper left-hand corner
+WACS_URCORNER	0x2510 	+	k	upper right-hand corner
+WACS_VLINE	0x2502 	|	x	vertical line
 .TE
 .PP
 The wide-character configuration of ncurses also defines symbols
-for thick- and double-lines:
+for double-lines:
 .PP
 .TS
-l l l l
-_ _ _ _
-lw(1.5i) lw7 lw7 lw20.
-\fIName\fR	\fIUnicode\fP	\fIDefault\fR	\fIDescription\fR
-WACS_T_ULCORNER	0x250f	+	thick upper left corner
-WACS_T_LLCORNER	0x2517	+	thick lower left corner
-WACS_T_URCORNER	0x2513	+	thick upper right corner
-WACS_T_LRCORNER	0x251b	+	thick lower right corner
-WACS_T_LTEE	0x252b	+	thick tee pointing right
-WACS_T_RTEE	0x2523	+	thick tee pointing left
-WACS_T_BTEE	0x253b	+	thick tee pointing up
-WACS_T_TTEE	0x2533	+	thick tee pointing down
-WACS_T_HLINE	0x2501	-	thick horizontal line
-WACS_T_VLINE	0x2503	|	thick vertical line
-WACS_T_PLUS	0x254b	+	thick large plus or crossover
-WACS_D_ULCORNER	0x2554	+	double upper left corner
-WACS_D_LLCORNER	0x255a	+	double lower left corner
-WACS_D_URCORNER	0x2557	+	double upper right corner
-WACS_D_LRCORNER	0x255d	+	double lower right corner
-WACS_D_RTEE	0x2563	+	double tee pointing left
-WACS_D_LTEE	0x2560	+	double tee pointing right
-WACS_D_BTEE	0x2569	+	double tee pointing up
-WACS_D_TTEE	0x2566	+	double tee pointing down
-WACS_D_HLINE	0x2550	-	double horizontal line
-WACS_D_VLINE	0x2551	|	double vertical line
-WACS_D_PLUS	0x256c	+	double large plus or crossover
+l l l l l
+l l l l l
+_ _ _ _ _
+lw(1.5i) lw5 lw5 lw5 lw20.
+\fBACS\fR	\fBUnicode\fP	\fBASCII\fR	\fBacsc\fP	\fBGlyph\fR
+\fBName\fR	\fBDefault\fP	\fBDefault\fR	\fBchar\fP	\fBName\fR
+WACS_D_BTEE	0x2569	+	H	double tee pointing up
+WACS_D_HLINE	0x2550	-	R	double horizontal line
+WACS_D_LLCORNER	0x255a	+	D	double lower left corner
+WACS_D_LRCORNER	0x255d	+	A	double lower right corner
+WACS_D_LTEE	0x2560	+	F	double tee pointing right
+WACS_D_PLUS	0x256c	+	E	double large plus
+WACS_D_RTEE	0x2563	+	G	double tee pointing left
+WACS_D_TTEE	0x2566	+	I	double tee pointing down
+WACS_D_ULCORNER	0x2554	+	C	double upper left corner
+WACS_D_URCORNER	0x2557	+	B	double upper right corner
+WACS_D_VLINE	0x2551	|	Y	double vertical line
+.TE
+.PP
+and for thick lines:
+.TS
+l l l l l
+l l l l l
+_ _ _ _ _
+lw(1.5i) lw5 lw5 lw5 lw20.
+\fBACS\fR	\fBUnicode\fP	\fBASCII\fR	\fBacsc\fP	\fBGlyph\fR
+\fBName\fR	\fBDefault\fP	\fBDefault\fR	\fBchar\fP	\fBName\fR
+WACS_T_BTEE	0x253b	+	V	thick tee pointing up
+WACS_T_HLINE	0x2501	-	Q	thick horizontal line
+WACS_T_LLCORNER	0x2517	+	M	thick lower left corner
+WACS_T_LRCORNER	0x251b	+	J	thick lower right corner
+WACS_T_LTEE	0x252b	+	T	thick tee pointing right
+WACS_T_PLUS	0x254b	+	N	thick large plus
+WACS_T_RTEE	0x2523	+	U	thick tee pointing left
+WACS_T_TTEE	0x2533	+	W	thick tee pointing down
+WACS_T_ULCORNER	0x250f	+	L	thick upper left corner
+WACS_T_URCORNER	0x2513	+	K	thick upper right corner
+WACS_T_VLINE	0x2503	|	X	thick vertical line
 .TE
 .SH RETURN VALUE
 .PP
 All routines return the integer \fBERR\fR upon failure and \fBOK\fR on success.
 .PP
-Functions with a "mv" prefix first perform a cursor movement using
+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
@@ -215,6 +233,64 @@ SVr4 curses implementations defined their line-drawing symbols in
 terms of intermediate symbols.
 This implementation extends those symbols, providing new definitions
 which are not in the SVr4 implementations.
+.PP
+Not all Unicode-capable terminals provide support for VT100-style
+alternate character sets (i.e., the \fBacsc\fP capability),
+with their corresponding line-drawing characters.
+X/Open Curses did not address the aspect of integrating Unicode with
+line-drawing characters.
+Existing implementations of Unix curses (AIX, HPUX, Solaris)
+use only the \fBacsc\fP character-mapping to provide this feature.
+As a result, those implementations can only use single-byte line-drawing
+characters.
+Ncurses 5.3 (2002) provided a table of Unicode values to solve these problems.
+NetBSD curses incorporated that table in 2010.
+.PP
+In this implementation, the Unicode values are used instead of the
+terminal description's \fBacsc\fP mapping as discussed in ncurses(3X)
+for the environment variable \fBNCURSES_NO_UTF8_ACS\fP.
+In contrast, for the same cases, the line-drawing characters
+described in \fBcurs_addch\fP(3X) will use only the ASCII default values.
+.PP
+Having Unicode available does not solve all of the problems with
+line-drawing for curses:
+.bP
+The closest Unicode equivalents to the
+VT100 graphics \fIS1\fP, \fIS3\fP, \fIS7\fP and \fIS9\fP
+frequently are not displayed at
+the regular intervals which the terminal used.
+.bP
+The \fIlantern\fP is a special case.
+It originated with the AT&T 4410 terminal in the early 1980s.
+There is no accessible documentation depicting the lantern symbol
+on the AT&T terminal.
+.IP
+Lacking documentation, most readers assume that a \fIstorm lantern\fP
+was intended.
+But there are several possibilities, all with problems.
+.IP
+Unicode 6.0 (2010) does provide two lantern symbols: U+1F383 and U+1F3EE.
+Those were not available in 2002, and are irrelevant since
+they lie outside the BMP and as a result are not generally available
+in terminals.
+They are not storm lanterns, in any case.
+.IP
+Most \fIstorm lanterns\fP have a tapering glass chimney
+(to guard against tipping);
+some have a wire grid protecting the chimney.
+.IP
+For the tapering appearance, \[u2603] U+2603 was adequate.
+In use on a terminal, no one can tell what the image represents.
+Unicode calls it a snowman.
+.IP
+Others have suggested these alternatives:
+\[sc] U+00A7 (section mark),
+\[u0398] U+0398 (theta),
+\[u03A6] U+03A6 (phi),
+\[u03B4] U+03B4 (delta),
+\[u2327] U+2327 (x in a rectangle),
+\[u256C] U+256C (forms double vertical and horizontal), and
+\[u2612] U+2612 (ballot box with x).
 .SH SEE ALSO
 .na
 .PP