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- * @Id: curs_add_wch.3x,v 1.48 2023/11/25 14:20:05 tom Exp @
+ * @Id: curs_add_wch.3x,v 1.49 2023/12/16 21:19:37 tom Exp @
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-<H1 class="no-header">curs_add_wch 3x 2023-11-25 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_add_wch 3x 2023-12-16 ncurses 6.4 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_add_wch.3x.html">curs_add_wch(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_add_wch.3x.html">curs_add_wch(3x)</A></STRONG>
WACS_URCORNER 0x2510 + k upper right-hand corner
WACS_VLINE 0x2502 | x vertical line
- The wide-character configuration of ncurses also defines symbols for
+ The wide-character configuration of <EM>ncurses</EM> also defines symbols for
thick lines (<STRONG>acsc</STRONG> "J" to "V"):
<STRONG>ACS</STRONG> <STRONG>Unicode</STRONG> <STRONG>ASCII</STRONG> <STRONG>acsc</STRONG> <STRONG>Glyph</STRONG>
WACS_D_VLINE 0x2551 | Y double vertical line
Unicode's descriptions for these characters differs slightly from
- ncurses, by introducing the term "light" (along with less important
+ <EM>ncurses</EM>, by introducing the term "light" (along with less important
details). Here are its descriptions for the normal, thick, and double
horizontal lines:
<STRONG>o</STRONG> If <STRONG><A HREF="scrollok.3x.html">scrollok(3x)</A></STRONG> 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
+ not possible to wrap to a new line.
<STRONG>o</STRONG> If an error is detected when converting a multibyte character to a
sequence of bytes, or if it is not possible to add all of the
Existing implementations of Unix curses (AIX, HP-UX, Solaris) use only
the <STRONG>acsc</STRONG> 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
+ <EM>ncurses</EM> 5.3 (2002) provided a table of Unicode values to solve these
problems. NetBSD curses incorporated that table in 2010.
In this implementation, the Unicode values are used instead of the
terminal description's <STRONG>acsc</STRONG> mapping as discussed in <STRONG><A HREF="ncurses.3x.html">ncurses(3x)</A></STRONG> for the
- environment variable <STRONG>NCURSES_NO_UTF8_ACS</STRONG>. In contrast, for the same
- cases, the line-drawing characters described in <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG> will use
- only the ASCII default values.
+ environment variable <EM>NCURSES</EM><STRONG>_</STRONG><EM>NO</EM><STRONG>_</STRONG><EM>UTF8</EM><STRONG>_</STRONG><EM>ACS</EM>. In contrast, for the same
+ cases, the line-drawing characters described in <STRONG><A HREF="curs_addch.3x.html">addch(3x)</A></STRONG> will use only
+ the ASCII default values.
Having Unicode available does not solve all of the problems with line-
drawing for curses:
<STRONG>o</STRONG> may hold one non-spacing character.
- In the latter case, ncurses adds the non-spacing character to the
+ In the latter case, <EM>ncurses</EM> adds the non-spacing character to the
active (base) spacing character.
-ncurses 6.4 2023-1
1-25 <STRONG><A HREF="curs_add_wch.3x.html">curs_add_wch(3x)</A></STRONG>
+ncurses 6.4 2023-1
2-16 <STRONG><A HREF="curs_add_wch.3x.html">curs_add_wch(3x)</A></STRONG>
</PRE>
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