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                 Display_MoveCursor(-1, 0);
  71                 Display_AddText(1, " ");
  72                 Display_MoveCursor(-1, 0);
  73                 // TODO: Need to handle \t and ^A-Z
  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                 Display_MoveCursor(INT_MIN, 0);
  83                 return 1;
  84         }
  85
  86          int    ret = 0;
  87         while( ret < Len )
  88         {
  89                 if( *Buf == '\n' )
  90                         break;
  91                 if( *Buf == '\x1b' )
  92                         break;
  93                 ret ++;
  94                 Buf ++;
  95         }
  96         return -ret;
  97 }
  98
  99 int Term_HandleVT100_Long(int Len, const char *Buffer)
 100 {
 101         char    c;
 102          int    argc = 0, j = 0;
 103          int    args[6] = {0,0,0,0,0,0};
 104          int    bQuestionMark = 0;
 105
 106         // Get Arguments
 107         if(j == Len)    return 0;
 108         c = Buffer[j++];
 109         if(c == '?') {
 110                 bQuestionMark = 1;
 111                 if(j == Len)    return 0;
 112                 c = Buffer[j++];
 113         }
 114         if( '0' <= c && c <= '9' )
 115         {
 116                 do {
 117                         if(c == ';') {
 118                                 if(j == Len)    return 0;
 119                                 c = Buffer[j++];
 120                         }
 121                         while('0' <= c && c <= '9') {
 122                                 args[argc] *= 10;
 123                                 args[argc] += c-'0';
 124                                 if(j == Len)    return 0;
 125                                 c = Buffer[j++];
 126                         }
 127                         argc ++;
 128                 } while(c == ';');
 129         }
 130
 131         // Get Command
 132         if( !isalpha(c) ) {
 133                 // Bother.
 134                 _SysDebug("Unexpected char 0x%x in VT100 escape code", c);
 135                 return 1;
 136         }
 137
 138         if( bQuestionMark )
 139         {
 140                 // Special commands
 141                 switch( c )
 142                 {
 143                 default:
 144                         _SysDebug("Unknown VT100 extended escape char 0x%x", c);
 145                         break;
 146                 }
 147         }
 148         else
 149         {
 150                 // Standard commands
 151                 switch( c )
 152                 {
 153                 case 'J':
 154                         if( argc == 0 )
 155                                 Display_ClearLine(0);
 156                         else if( args[0] == 2 )
 157                                 Display_ClearLines(0);  // Entire screen!
 158                         else
 159                                 _SysDebug("TODO: VT100 %i J", args[0]);
 160                         break;
 161                 case 'm':
 162                         if( argc == 0 )
 163                         {
 164                                 // Reset
 165                         }
 166                         else
 167                         {
 168                                 int i;
 169                                 for( i = 0; i < argc; i ++ )
 170                                 {
 171                                         if( args[i] < 8 )
 172                                         {
 173                                                 // TODO: Flags?
 174                                         }
 175                                         else if( 30 <= args[i] && args[i] <= 37 )
 176                                         {
 177                                                 // TODO: Bold/bright
 178                                                 Display_SetForeground( caVT100Colours[ args[i]-30 ] );
 179                                         }
 180                                         else if( 40 <= args[i] && args[i] <= 47 )
 181                                         {
 182                                                 // TODO: Bold/bright
 183                                                 Display_SetBackground( caVT100Colours[ args[i]-30 ] );
 184                                         }
 185                                 }
 186                         }
 187                         break;
 188                 default:
 189                         _SysDebug("Unknown VT100 escape char 0x%x", c);
 190                         break;
 191                 }
 192         }
 193         return j;
 194 }