[PDCurses] ACS characters

[William McBrine]

In curses.h, there's a section marked off with #if 0 that provides better
definitions for some of the ACS characters. Until now, I'd been
uncommenting this manually each time I got a new version, but I hadn't
gone to the trouble to devise a proper fix. This is it -- patch attached.

PDC_chadd() only attempts to interpret characters (or rather, chtypes) as
control codes if they're in the range 0-31, or 127, and _don't_ have the
A_ALTCHARSET attribute. If they do, they're passed straight through. So,
the ACS_BOARD and ACS_BLOCK definitions don't actually need any changes;
for the rest, all I had to do was add A_ALTCHARSET to the definition, and
they'll work regardless of whether raw mode is used.

-- 
William McBrine <[EMAIL PROTECTED]>
*** curses.h.old        Wed Nov 27 06:22:46 2002
--- curses.h    Tue Jun  3 14:49:07 2003
***************
*** 1148,1178 ****
  # define ACS_PLUS     (chtype)0xc5                    /* SysV         */
  # define ACS_S1       (chtype)0x2d                    /* SysV         */
  # define ACS_S9       (chtype)0x5f                    /* SysV         */
- # define ACS_DIAMOND  (chtype)0xc5                    /* SysV         */
  # define ACS_CKBOARD  (chtype)0xb2                    /* SysV         */
  # define ACS_DEGREE   (chtype)0xf8                    /* SysV         */
  # define ACS_PLMINUS  (chtype)0xf1                    /* SysV         */
  # define ACS_BULLET   (chtype)0xf9                    /* SysV         */
- # define ACS_LARROW   (chtype)0x3c                    /* SysV         */
- # define ACS_RARROW   (chtype)0x3e                    /* SysV         */
- # define ACS_DARROW   (chtype)0x76                    /* SysV         */
- # define ACS_UARROW   (chtype)0x5e                    /* SysV         */
- # define ACS_BOARD    (chtype)0x23                    /* SysV         */
- # define ACS_LANTERN  (chtype)0x23                    /* SysV         */
- # define ACS_BLOCK    (chtype)0x23                    /* SysV         */
  
  /* the following definitions can be used if you have set raw_output()
     or are using the PDCurses *raw*() functions                        */
! # if 0
! #  define ACS_DIAMOND (chtype)0x04                    /* SysV         */
! #  define ACS_LARROW  (chtype)0x1b                    /* SysV         */
! #  define ACS_RARROW  (chtype)0x1a                    /* SysV         */
! #  define ACS_DARROW  (chtype)0x19                    /* SysV         */
! #  define ACS_UARROW  (chtype)0x18                    /* SysV         */
! #  define ACS_BOARD   (chtype)0xb0                    /* SysV         */
! #  define ACS_LANTERN (chtype)0x0f                    /* SysV         */
! #  define ACS_BLOCK   (chtype)0xdb                    /* SysV         */
! # endif
  #endif
  
  /* colour attributes */
--- 1148,1168 ----
  # define ACS_PLUS     (chtype)0xc5                    /* SysV         */
  # define ACS_S1       (chtype)0x2d                    /* SysV         */
  # define ACS_S9       (chtype)0x5f                    /* SysV         */
  # define ACS_CKBOARD  (chtype)0xb2                    /* SysV         */
  # define ACS_DEGREE   (chtype)0xf8                    /* SysV         */
  # define ACS_PLMINUS  (chtype)0xf1                    /* SysV         */
  # define ACS_BULLET   (chtype)0xf9                    /* SysV         */
  
  /* the following definitions can be used if you have set raw_output()
     or are using the PDCurses *raw*() functions                        */
! # define ACS_DIAMOND  ((chtype)0x04 | A_ALTCHARSET)   /* SysV         */
! # define ACS_LARROW   ((chtype)0x1b | A_ALTCHARSET)   /* SysV         */
! # define ACS_RARROW   ((chtype)0x1a | A_ALTCHARSET)   /* SysV         */
! # define ACS_DARROW   ((chtype)0x19 | A_ALTCHARSET)   /* SysV         */
! # define ACS_UARROW   ((chtype)0x18 | A_ALTCHARSET)   /* SysV         */
! # define ACS_BOARD    (chtype)0xb0                    /* SysV         */
! # define ACS_LANTERN  ((chtype)0x0f | A_ALTCHARSET)   /* SysV         */
! # define ACS_BLOCK    (chtype)0xdb                    /* SysV         */
  #endif
  
  /* colour attributes */