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      1 /*	$NetBSD: boxdraw.c,v 1.1.1.2 2018/08/16 18:17:47 jmcneill Exp $	*/
      2 
      3 /*++
      4 
      5 Copyright (c) 1998  Intel Corporation
      6 
      7 Module Name:
      8 
      9     BoxDraw.c
     10 
     11 Abstract:
     12     Lib functions to support Box Draw Unicode code pages.
     13 
     14 
     15 
     16 Revision History
     17 
     18 --*/
     19 
     20 #include "lib.h"
     21 
     22 typedef struct {
     23     CHAR16  Unicode;
     24     CHAR8   PcAnsi;
     25     CHAR8   Ascii;
     26 } UNICODE_TO_CHAR;
     27 
     28 
     29 //
     30 // This list is used to define the valid extend chars.
     31 // It also provides a mapping from Unicode to PCANSI or
     32 // ASCII. The ASCII mapping we just made up.
     33 //
     34 //
     35 
     36 STATIC UNICODE_TO_CHAR UnicodeToPcAnsiOrAscii[] = {
     37     { BOXDRAW_HORIZONTAL,                 0xc4, L'-'},
     38     { BOXDRAW_VERTICAL,                   0xb3, L'|'},
     39     { BOXDRAW_DOWN_RIGHT,                 0xda, L'/'},
     40     { BOXDRAW_DOWN_LEFT,                  0xbf, L'\\'},
     41     { BOXDRAW_UP_RIGHT,                   0xc0, L'\\'},
     42     { BOXDRAW_UP_LEFT,                    0xd9, L'/'},
     43     { BOXDRAW_VERTICAL_RIGHT,             0xc3, L'|'},
     44     { BOXDRAW_VERTICAL_LEFT,              0xb4, L'|'},
     45     { BOXDRAW_DOWN_HORIZONTAL,            0xc2, L'+'},
     46     { BOXDRAW_UP_HORIZONTAL,              0xc1, L'+'},
     47     { BOXDRAW_VERTICAL_HORIZONTAL,        0xc5, L'+'},
     48     { BOXDRAW_DOUBLE_HORIZONTAL,          0xcd, L'-'},
     49     { BOXDRAW_DOUBLE_VERTICAL,            0xba, L'|'},
     50     { BOXDRAW_DOWN_RIGHT_DOUBLE,          0xd5, L'/'},
     51     { BOXDRAW_DOWN_DOUBLE_RIGHT,          0xd6, L'/'},
     52     { BOXDRAW_DOUBLE_DOWN_RIGHT,          0xc9, L'/'},
     53     { BOXDRAW_DOWN_LEFT_DOUBLE,           0xb8, L'\\'},
     54     { BOXDRAW_DOWN_DOUBLE_LEFT,           0xb7, L'\\'},
     55     { BOXDRAW_DOUBLE_DOWN_LEFT,           0xbb, L'\\'},
     56     { BOXDRAW_UP_RIGHT_DOUBLE,            0xd4, L'\\'},
     57     { BOXDRAW_UP_DOUBLE_RIGHT,            0xd3, L'\\'},
     58     { BOXDRAW_DOUBLE_UP_RIGHT,            0xc8, L'\\'},
     59     { BOXDRAW_UP_LEFT_DOUBLE,             0xbe, L'/'},
     60     { BOXDRAW_UP_DOUBLE_LEFT,             0xbd, L'/'},
     61     { BOXDRAW_DOUBLE_UP_LEFT,             0xbc, L'/'},
     62     { BOXDRAW_VERTICAL_RIGHT_DOUBLE,      0xc6, L'|'},
     63     { BOXDRAW_VERTICAL_DOUBLE_RIGHT,      0xc7, L'|'},
     64     { BOXDRAW_DOUBLE_VERTICAL_RIGHT,      0xcc, L'|'},
     65     { BOXDRAW_VERTICAL_LEFT_DOUBLE,       0xb5, L'|'},
     66     { BOXDRAW_VERTICAL_DOUBLE_LEFT,       0xb6, L'|'},
     67     { BOXDRAW_DOUBLE_VERTICAL_LEFT,       0xb9, L'|'},
     68     { BOXDRAW_DOWN_HORIZONTAL_DOUBLE,     0xd1, L'+'},
     69     { BOXDRAW_DOWN_DOUBLE_HORIZONTAL,     0xd2, L'+'},
     70     { BOXDRAW_DOUBLE_DOWN_HORIZONTAL,     0xcb, L'+'},
     71     { BOXDRAW_UP_HORIZONTAL_DOUBLE,       0xcf, L'+'},
     72     { BOXDRAW_UP_DOUBLE_HORIZONTAL,       0xd0, L'+'},
     73     { BOXDRAW_DOUBLE_UP_HORIZONTAL,       0xca, L'+'},
     74     { BOXDRAW_VERTICAL_HORIZONTAL_DOUBLE, 0xd8, L'+'},
     75     { BOXDRAW_VERTICAL_DOUBLE_HORIZONTAL, 0xd7, L'+'},
     76     { BOXDRAW_DOUBLE_VERTICAL_HORIZONTAL, 0xce, L'+'},
     77 
     78     { BLOCKELEMENT_FULL_BLOCK,            0xdb, L'*'},
     79     { BLOCKELEMENT_LIGHT_SHADE,           0xb0, L'+'},
     80 
     81     { GEOMETRICSHAPE_UP_TRIANGLE,         0x1e, L'^'},
     82     { GEOMETRICSHAPE_RIGHT_TRIANGLE,      0x10, L'>'},
     83     { GEOMETRICSHAPE_DOWN_TRIANGLE,       0x1f, L'v'},
     84     { GEOMETRICSHAPE_LEFT_TRIANGLE,       0x11, L'<'},
     85 
     86     /* BugBug: Left Arrow is an ESC. We can not make it print
     87                 on a PCANSI terminal. If we can make left arrow
     88                 come out on PC ANSI we can add it back.
     89 
     90     { ARROW_LEFT,                         0x1b, L'<'},
     91     */
     92 
     93     { ARROW_UP,                           0x18, L'^'},
     94 
     95     /* BugBut: Took out left arrow so right has to go too.
     96        { ARROW_RIGHT,                        0x1a, L'>'},
     97     */
     98     { ARROW_DOWN,                         0x19, L'v'},
     99 
    100     { 0x0000, 0x00, L'\0' }
    101 };
    102 
    103 
    104 BOOLEAN
    105 LibIsValidTextGraphics (
    106     IN  CHAR16  Graphic,
    107     OUT CHAR8   *PcAnsi,    OPTIONAL
    108     OUT CHAR8   *Ascii      OPTIONAL
    109     )
    110 /*++
    111 
    112 Routine Description:
    113 
    114     Detects if a Unicode char is for Box Drawing text graphics.
    115 
    116 Arguments:
    117 
    118     Grphic  - Unicode char to test.
    119 
    120     PcAnsi  - Optional pointer to return PCANSI equivalent of Graphic.
    121 
    122     Asci    - Optional pointer to return Ascii equivalent of Graphic.
    123 
    124 Returns:
    125 
    126     TRUE if Gpaphic is a supported Unicode Box Drawing character.
    127 
    128 --*/{
    129     UNICODE_TO_CHAR     *Table;
    130 
    131     if ((((Graphic & 0xff00) != 0x2500) && ((Graphic & 0xff00) != 0x2100))) {
    132 
    133         //
    134         // Unicode drawing code charts are all in the 0x25xx range,
    135         //  arrows are 0x21xx
    136         //
    137         return FALSE;
    138     }
    139 
    140     for (Table = UnicodeToPcAnsiOrAscii; Table->Unicode != 0x0000; Table++) {
    141         if (Graphic == Table->Unicode) {
    142             if (PcAnsi) {
    143                 *PcAnsi = Table->PcAnsi;
    144             }
    145             if (Ascii) {
    146                 *Ascii = Table->Ascii;
    147             }
    148             return TRUE;
    149         }
    150     }
    151     return FALSE;
    152 }
    153 
    154 BOOLEAN
    155 IsValidAscii (
    156     IN  CHAR16  Ascii
    157     )
    158 {
    159     if ((Ascii >= 0x20) && (Ascii <= 0x7f)) {
    160         return TRUE;
    161     }
    162     return FALSE;
    163 }
    164 
    165 BOOLEAN
    166 IsValidEfiCntlChar (
    167     IN  CHAR16  c
    168     )
    169 {
    170     if (c == CHAR_NULL || c == CHAR_BACKSPACE || c == CHAR_LINEFEED || c == CHAR_CARRIAGE_RETURN) {
    171         return TRUE;
    172     }
    173     return FALSE;
    174 }
    175 
    176