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  1. /*++
  2.  
  3. Copyright (c) 1998  Intel Corporation
  4.  
  5. Module Name:
  6.  
  7.     BoxDraw.c
  8.  
  9. Abstract:
  10.     Lib functions to support Box Draw Unicode code pages.
  11.  
  12.  
  13.  
  14. Revision History
  15.  
  16. --*/
  17.  
  18. #include "lib.h"
  19.  
  20. typedef struct {
  21.     CHAR16  Unicode;
  22.     CHAR8   PcAnsi;
  23.     CHAR8   Ascii;
  24. } UNICODE_TO_CHAR;
  25.  
  26.  
  27. //
  28. // This list is used to define the valid extend chars.
  29. // It also provides a mapping from Unicode to PCANSI or
  30. // ASCII. The ASCII mapping we just made up.
  31. //
  32. //
  33.  
  34. STATIC UNICODE_TO_CHAR UnicodeToPcAnsiOrAscii[] = {
  35.     { BOXDRAW_HORIZONTAL,                 0xc4, L'-'},
  36.     { BOXDRAW_VERTICAL,                   0xb3, L'|'},
  37.     { BOXDRAW_DOWN_RIGHT,                 0xda, L'/'},
  38.     { BOXDRAW_DOWN_LEFT,                  0xbf, L'\\'},
  39.     { BOXDRAW_UP_RIGHT,                   0xc0, L'\\'},
  40.     { BOXDRAW_UP_LEFT,                    0xd9, L'/'},
  41.     { BOXDRAW_VERTICAL_RIGHT,             0xc3, L'|'},
  42.     { BOXDRAW_VERTICAL_LEFT,              0xb4, L'|'},
  43.     { BOXDRAW_DOWN_HORIZONTAL,            0xc2, L'+'},
  44.     { BOXDRAW_UP_HORIZONTAL,              0xc1, L'+'},
  45.     { BOXDRAW_VERTICAL_HORIZONTAL,        0xc5, L'+'},
  46.     { BOXDRAW_DOUBLE_HORIZONTAL,          0xcd, L'-'},
  47.     { BOXDRAW_DOUBLE_VERTICAL,            0xba, L'|'},
  48.     { BOXDRAW_DOWN_RIGHT_DOUBLE,          0xd5, L'/'},
  49.     { BOXDRAW_DOWN_DOUBLE_RIGHT,          0xd6, L'/'},
  50.     { BOXDRAW_DOUBLE_DOWN_RIGHT,          0xc9, L'/'},
  51.     { BOXDRAW_DOWN_LEFT_DOUBLE,           0xb8, L'\\'},
  52.     { BOXDRAW_DOWN_DOUBLE_LEFT,           0xb7, L'\\'},
  53.     { BOXDRAW_DOUBLE_DOWN_LEFT,           0xbb, L'\\'},
  54.     { BOXDRAW_UP_RIGHT_DOUBLE,            0xd4, L'\\'},
  55.     { BOXDRAW_UP_DOUBLE_RIGHT,            0xd3, L'\\'},
  56.     { BOXDRAW_DOUBLE_UP_RIGHT,            0xc8, L'\\'},
  57.     { BOXDRAW_UP_LEFT_DOUBLE,             0xbe, L'/'},
  58.     { BOXDRAW_UP_DOUBLE_LEFT,             0xbd, L'/'},
  59.     { BOXDRAW_DOUBLE_UP_LEFT,             0xbc, L'/'},
  60.     { BOXDRAW_VERTICAL_RIGHT_DOUBLE,      0xc6, L'|'},
  61.     { BOXDRAW_VERTICAL_DOUBLE_RIGHT,      0xc7, L'|'},
  62.     { BOXDRAW_DOUBLE_VERTICAL_RIGHT,      0xcc, L'|'},
  63.     { BOXDRAW_VERTICAL_LEFT_DOUBLE,       0xb5, L'|'},
  64.     { BOXDRAW_VERTICAL_DOUBLE_LEFT,       0xb6, L'|'},
  65.     { BOXDRAW_DOUBLE_VERTICAL_LEFT,       0xb9, L'|'},
  66.     { BOXDRAW_DOWN_HORIZONTAL_DOUBLE,     0xd1, L'+'},
  67.     { BOXDRAW_DOWN_DOUBLE_HORIZONTAL,     0xd2, L'+'},
  68.     { BOXDRAW_DOUBLE_DOWN_HORIZONTAL,     0xcb, L'+'},
  69.     { BOXDRAW_UP_HORIZONTAL_DOUBLE,       0xcf, L'+'},
  70.     { BOXDRAW_UP_DOUBLE_HORIZONTAL,       0xd0, L'+'},
  71.     { BOXDRAW_DOUBLE_UP_HORIZONTAL,       0xca, L'+'},
  72.     { BOXDRAW_VERTICAL_HORIZONTAL_DOUBLE, 0xd8, L'+'},
  73.     { BOXDRAW_VERTICAL_DOUBLE_HORIZONTAL, 0xd7, L'+'},
  74.     { BOXDRAW_DOUBLE_VERTICAL_HORIZONTAL, 0xce, L'+'},
  75.  
  76.     { BLOCKELEMENT_FULL_BLOCK,            0xdb, L'*'},
  77.     { BLOCKELEMENT_LIGHT_SHADE,           0xb0, L'+'},
  78.  
  79.     { GEOMETRICSHAPE_UP_TRIANGLE,         0x1e, L'^'},
  80.     { GEOMETRICSHAPE_RIGHT_TRIANGLE,      0x10, L'>'},
  81.     { GEOMETRICSHAPE_DOWN_TRIANGLE,       0x1f, L'v'},
  82.     { GEOMETRICSHAPE_LEFT_TRIANGLE,       0x11, L'<'},
  83.  
  84.     /* BugBug: Left Arrow is an ESC. We can not make it print
  85.                 on a PCANSI terminal. If we can make left arrow
  86.                 come out on PC ANSI we can add it back.
  87.  
  88.     { ARROW_LEFT,                         0x1b, L'<'},
  89.     */
  90.  
  91.     { ARROW_UP,                           0x18, L'^'},
  92.    
  93.     /* BugBut: Took out left arrow so right has to go too.
  94.        { ARROW_RIGHT,                        0x1a, L'>'},
  95.     */      
  96.     { ARROW_DOWN,                         0x19, L'v'},
  97.    
  98.     { 0x0000, 0x00 }
  99. };
  100.  
  101.  
  102. BOOLEAN
  103. LibIsValidTextGraphics (
  104.     IN  CHAR16  Graphic,
  105.     OUT CHAR8   *PcAnsi,    OPTIONAL
  106.     OUT CHAR8   *Ascii      OPTIONAL
  107.     )
  108. /*++
  109.  
  110. Routine Description:
  111.  
  112.     Detects if a Unicode char is for Box Drawing text graphics.
  113.  
  114. Arguments:
  115.  
  116.     Grphic  - Unicode char to test.
  117.  
  118.     PcAnsi  - Optional pointer to return PCANSI equivalent of Graphic.
  119.  
  120.     Asci    - Optional pointer to return Ascii equivalent of Graphic.
  121.  
  122. Returns:
  123.  
  124.     TRUE if Gpaphic is a supported Unicode Box Drawing character.
  125.  
  126. --*/{
  127.     UNICODE_TO_CHAR     *Table;
  128.  
  129.     if ((((Graphic & 0xff00) != 0x2500) && ((Graphic & 0xff00) != 0x2100))) {
  130.      
  131.         //
  132.         // Unicode drawing code charts are all in the 0x25xx range,
  133.         //  arrows are 0x21xx
  134.         //
  135.         return FALSE;
  136.     }
  137.  
  138.     for (Table = UnicodeToPcAnsiOrAscii; Table->Unicode != 0x0000; Table++) {
  139.         if (Graphic == Table->Unicode) {
  140.             if (PcAnsi) {
  141.                 *PcAnsi = Table->PcAnsi;
  142.             }
  143.             if (Ascii) {
  144.                 *Ascii = Table->Ascii;
  145.             }
  146.             return TRUE;
  147.         }
  148.     }
  149.     return FALSE;
  150. }
  151.  
  152. BOOLEAN
  153. IsValidAscii (
  154.     IN  CHAR16  Ascii
  155.     )
  156. {
  157.     if ((Ascii >= 0x20) && (Ascii <= 0x7f)) {
  158.         return TRUE;
  159.     }              
  160.     return FALSE;
  161. }
  162.  
  163. BOOLEAN
  164. IsValidEfiCntlChar (
  165.     IN  CHAR16  c
  166.     )
  167. {
  168.     if (c == CHAR_NULL || c == CHAR_BACKSPACE || c == CHAR_LINEFEED || c == CHAR_CARRIAGE_RETURN) {
  169.         return TRUE;
  170.     }              
  171.     return FALSE;
  172. }
  173.  
  174.