Usermode/Applications/gui_shell_src/vt100.c

   1 /*
   2  * Acess GUI Terminal
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * vt100.c
   6  * - VT100/xterm Emulation
   7  */
   8 #include <string.h>
   9 #include <limits.h>
  10 #include "include/vt100.h"
  11 #include "include/display.h"
  12 #include <ctype.h>      // isalpha
  13 #include <acess/sys.h>  // _SysDebug
  14
  15 const uint32_t  caVT100Colours[] = {
  16         // Black, Red, Green, Yellow, Blue, Purple, Cyan, Gray
  17         // Same again, but bright
  18         0x000000, 0x770000, 0x007700, 0x777700, 0x000077, 0x770077, 0x007777, 0xAAAAAAA,
  19         0xCCCCCC, 0xFF0000, 0x00FF00, 0xFFFF00, 0x0000FF, 0xFF00FF, 0x00FFFF, 0xFFFFFFF
  20 };
  21
  22  int    Term_HandleVT100_Long(int Len, const char *Buf);
  23
  24 static inline int min(int a, int b)
  25 {
  26         return a < b ? a : b;
  27 }
  28
  29 int Term_HandleVT100(int Len, const char *Buf)
  30 {
  31         #define MAX_VT100_ESCAPE_LEN    16
  32         static char     inc_buf[MAX_VT100_ESCAPE_LEN];
  33         static int      inc_len = 0;
  34
  35         if( inc_len > 0 || *Buf == '\x1b' )
  36         {
  37                 // Handle VT100 (like) escape sequence
  38                  int    new_bytes = min(MAX_VT100_ESCAPE_LEN - inc_len, Len);
  39                  int    ret = 0, old_inc_len = inc_len;
  40                 memcpy(inc_buf + inc_len, Buf, new_bytes);
  41
  42                 inc_len += new_bytes;
  43
  44                 if( inc_len <= 1 )
  45                         return 1;       // Skip 1 character (the '\x1b')
  46
  47                 switch(inc_buf[1])
  48                 {
  49                 case '[':       // Multibyte, funtime starts
  50                         ret = Term_HandleVT100_Long(inc_len-2, inc_buf+2);
  51                         if( ret > 0 ) {
  52                                 ret += 2;
  53                         }
  54                         break;
  55                 default:
  56                         ret = 2;
  57                         break;
  58                 }
  59
  60                 if( ret != 0 ) {
  61                         inc_len = 0;
  62                         ret -= old_inc_len;     // counter cached bytes
  63                 }
  64                 return ret;
  65         }
  66
  67         switch( *Buf )
  68         {
  69         case '\b':
  70                 // TODO: Backspace
  71                 Display_MoveCursor(-1, 0);
  72                 Display_AddText(1, " ");
  73                 Display_MoveCursor(-1, 0);
  74                 return 1;
  75         case '\t':
  76                 // TODO: tab (get current cursor pos, space until multiple of 8)
  77                 return 1;
  78         case '\n':
  79                 Display_Newline(1);
  80                 return 1;
  81         case '\r':
  82                 // TODO: Carriage return
  83                 Display_MoveCursor(INT_MIN, 0);
  84                 return 1;
  85         }
  86
  87          int    ret = 0;
  88         while( ret < Len )
  89         {
  90                 if( *Buf == '\n' )
  91                         break;
  92                 if( *Buf == '\x1b' )
  93                         break;
  94                 ret ++;
  95                 Buf ++;
  96         }
  97         return -ret;
  98 }
  99
 100 int Term_HandleVT100_Long(int Len, const char *Buffer)
 101 {
 102         char    c;
 103          int    argc = 0, j = 0;
 104          int    args[6] = {0,0,0,0,0,0};
 105          int    bQuestionMark = 0;
 106
 107         // Get Arguments
 108         if(j == Len)    return 0;
 109         c = Buffer[j++];
 110         if(c == '?') {
 111                 bQuestionMark = 1;
 112                 if(j == Len)    return 0;
 113                 c = Buffer[j++];
 114         }
 115         if( '0' <= c && c <= '9' )
 116         {
 117                 do {
 118                         if(c == ';') {
 119                                 if(j == Len)    return 0;
 120                                 c = Buffer[j++];
 121                         }
 122                         while('0' <= c && c <= '9') {
 123                                 args[argc] *= 10;
 124                                 args[argc] += c-'0';
 125                                 if(j == Len)    return 0;
 126                                 c = Buffer[j++];
 127                         }
 128                         argc ++;
 129                 } while(c == ';');
 130         }
 131
 132         // Get Command
 133         if( !isalpha(c) ) {
 134                 // Bother.
 135                 _SysDebug("Unexpected char 0x%x in VT100 escape code", c);
 136                 return 1;
 137         }
 138
 139         if( bQuestionMark )
 140         {
 141                 // Special commands
 142                 switch( c )
 143                 {
 144                 default:
 145                         _SysDebug("Unknown VT100 extended escape char 0x%x", c);
 146                         break;
 147                 }
 148         }
 149         else
 150         {
 151                 // Standard commands
 152                 switch( c )
 153                 {
 154                 case 'J':
 155                         if( argc == 0 )
 156                                 Display_ClearLine(0);
 157                         else if( args[0] == 2 )
 158                                 Display_ClearLines(0);  // Entire screen!
 159                         else
 160                                 _SysDebug("TODO: VT100 %i J", args[0]);
 161                         break;
 162                 case 'm':
 163                         if( argc == 0 )
 164                         {
 165                                 // Reset
 166                         }
 167                         else
 168                         {
 169                                 int i;
 170                                 for( i = 0; i < argc; i ++ )
 171                                 {
 172                                         if( args[i] < 8 )
 173                                         {
 174                                                 // Flags?
 175                                         }
 176                                         else if( 30 <= args[i] && args[i] <= 37 )
 177                                         {
 178                                                 // TODO: Bold/bright
 179                                                 Display_SetForeground( caVT100Colours[ args[i]-30 ] );
 180                                         }
 181                                         else if( 40 <= args[i] && args[i] <= 47 )
 182                                         {
 183                                                 // TODO: Bold/bright
 184                                                 Display_SetBackground( caVT100Colours[ args[i]-30 ] );
 185                                         }
 186                                 }
 187                         }
 188                         break;
 189                 default:
 190                         _SysDebug("Unknown VT100 escape char 0x%x", c);
 191                         break;
 192                 }
 193         }
 194         return j;
 195 }