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Rev Author Line No. Line
3540 clevermous 1 
; fetch the UTF-8 character in string+offs to char
2 
; common part for all encodings: translate pseudographics
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; Pseudographics for the boot screen:
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; 0x2500 -> 0xC4, 0x2502 -> 0xB3, 0x250C -> 0xDA, 0x2510 -> 0xBF,
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; 0x2514 -> 0xC0, 0x2518 -> 0xD9, 0x252C -> 0xC2, 0x2534 -> 0xC1, 0x2551 -> 0xBA
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macro fetch_utf8_char string, offs, char, graph
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{ local first_byte, b
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  virtual at 0
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    db string
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    if offs >= $
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      char = -1
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    else
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      ; fetch first byte
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      load first_byte byte from offs
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      if first_byte < 0x80
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        char = first_byte
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        offs = offs + 1
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      else if first_byte < 0xC0
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        .err Invalid UTF-8 string
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      else if first_byte < 0xE0
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        char = first_byte and 0x1F
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        load b byte from offs + 1
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        char = (char shl 6) + (b and 0x3F)
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        offs = offs + 2
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      else if first_byte < 0xF0
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        char = first_byte and 0xF
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        load b byte from offs + 1
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        char = (char shl 6) + (b and 0x3F)
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        load b byte from offs + 2
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        char = (char shl 6) + (b and 0x3F)
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        offs = offs + 3
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      else if first_byte < 0xF8
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        char = first_byte and 0x7
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        load b byte from offs + 1
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        char = (char shl 6) + (b and 0x3F)
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        load b byte from offs + 2
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        char = (char shl 6) + (b and 0x3F)
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        load b byte from offs + 3
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        char = (char shl 6) + (b and 0x3F)
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        offs = offs + 4
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      else
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        .err Invalid UTF-8 string
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      end if
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    end if
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  end virtual
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  if char = 0x2500
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    graph = 0xC4
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  else if char = 0x2502
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    graph = 0xB3
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  else if char = 0x250C
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    graph = 0xDA
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  else if char = 0x2510
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    graph = 0xBF
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  else if char = 0x2514
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    graph = 0xC0
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  else if char = 0x2518
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    graph = 0xD9
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  else if char = 0x252C
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    graph = 0xC2
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  else if char = 0x2534
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    graph = 0xC1
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  else if char = 0x2551
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    graph = 0xBA
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  else
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    graph = 0
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  end if
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}
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; Russian: use CP866.
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; 0x00-0x7F - trivial map
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; 0x410-0x43F -> 0x80-0xAF
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; 0x440-0x44F -> 0xE0-0xEF
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; 0x401 -> 0xF0, 0x451 -> 0xF1
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macro cp866 [arg]
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{ local offs, char, graph
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  offs = 0
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  while 1
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    fetch_utf8_char arg, offs, char, graph
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    if char = -1
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      break
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    end if
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    if graph
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      db graph
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    else if char < 0x80
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      db char
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    else if char = 0x401
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      db 0xF0
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    else if char = 0x451
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      db 0xF1
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    else if (char < 0x410) | (char > 0x44F)
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      .err Failed to convert to CP866
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    else if char < 0x440
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      db char - 0x410 + 0x80
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    else
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      db char - 0x440 + 0xE0
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    end if
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  end while
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}
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100 
; Latin-1 encoding
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; 0x00-0xFF - trivial map
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macro latin1 [arg]
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{ local offs, char, graph
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  offs = 0
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  while 1
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    fetch_utf8_char arg, offs, char, graph
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    if char = -1
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      break
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    end if
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    if graph
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      db graph
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    else if char < 0x100
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      db char
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    else
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      .err Failed to convert to Latin-1
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    end if
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  end while
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}
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; CP850 encoding
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macro cp850 [arg]
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{ local offs, char, graph
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  offs = 0
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  while 1
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    fetch_utf8_char arg, offs, char, graph
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    if char = -1
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      break
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    end if
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    if graph
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      db graph
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    else if char < 0x80
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      db char
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    else if char = 0xBF
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      db 0xA8
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    else if char = 0xE1
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      db 0xA0
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    else if char = 0xE9
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      db 0x82
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    else if char = 0xED
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      db 0xA1
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    else if char = 0xF3
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      db 0xA2
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    else if char = 0xFA
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      db 0xA3
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    else
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      err Failed to convert to CP850
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    end if
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  end while
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}