| 1 | This is version 0_1 of bfcl
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| 2 |
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| 3 | bfcl is a BrainFuck compiler for Linux written itself in BrainFuck
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| 4 | It reads the input from stdin and outputs a Linux ELF binary on stdout
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| 5 | Currently no optimization at all is done (which is another reason why
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| 6 | this thing is so sloooooooow on my system :) but that is planned for
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| 7 | version 0_2
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| 8 |
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| 9 | Conventions assumed in this program:
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| 10 | fields are one byte long and decreasing zero is possible
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| 11 |
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| 12 | Conventions in the binaries compiled with bfcl:
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| 13 | a) fields are one byte long
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| 14 | b) there are 30 000 fields
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| 15 | c) moving the pointer outside this area will lead to your computer
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| 16 | catching fire;
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| 17 | nothing is done to prevent you from doing that however
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| 18 | d) when end of file is encountered the program stores whatever
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| 19 | the Linux syscall returns (I believe it's zero but I'm too lazy to
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| 20 | check)
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| 21 | e) No checks are made on matching parentheses; maybe for version 0_3 :)
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| 22 |
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| 23 | And yes; I know the code is far from pretty; far from optimized; and not
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| 24 | very well documented; but I'm sending it out anyway because the longer I
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| 25 | stare at it the more my head hurts
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| 26 |
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| 27 | Final word of thanks: many ideas are shamelessly stolen from Brian
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| 28 | Raiter's 171 byte BF compiler available from www_muppetlabs_com/~breadbox/
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| 29 |
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| 30 | For questions and comments you can reach me at
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| 31 | vissers@theochem dot kun dot nl
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| 32 | You will forgive me for not typing the dots :)
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| 33 |
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| 34 | Ge Vissers
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| 35 | 17 april 2003
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| 36 |
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| 37 | **************************************************************************
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| 38 |
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| 39 | >>>>>>> reserve some extra space
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| 40 | so we can shift the program later
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| 41 |
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| 42 | Read the program
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| 43 |
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| 44 | Reading a character is a bit of a nuisance since different compilers
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| 45 | use different strategies:
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| 46 | a) leave byte unchanged
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| 47 | b) set byte to zero
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| 48 | c) set byte to 0xff
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| 49 | I *believe* the following code snippets catches all three possibilities above
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| 50 | so that the program ends on either a null or a 0xff byte
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| 51 |
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| 52 | >- set character to 0xff
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| 53 | , read a character
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| 54 | [<+>->+<] copy byte to previous and next field
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| 55 | >[+<]> if byte is not zero
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| 56 | add one to it
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| 57 | [ if it is still not zero
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| 58 | [-]< clear the copy
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| 59 | +++++[<-------->-]<--- subtract plus from input
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| 60 | [ if char is not plus
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| 61 | - subtract 1 from char
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| 62 | [ if char is not comma
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| 63 | - subtract 1 from char
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| 64 | [ if char is not minus
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| 65 | - subtract 1 from char
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| 66 | [ if char is not dot
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| 67 | -------------- subtract 14 from char
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| 68 | [ if char is not left angle
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| 69 | -- subtract 2 from char
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| 70 | [ if char is not right angle
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| 71 | >+++[<---------->-]<+ subtract 29 from char
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| 72 | [ if char is not left bracket
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| 73 | -- subtract 2 from char
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| 74 | [ if char is not right bracket
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| 75 | <--------> set opcode to minus 8
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| 76 | [-] clear character
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| 77 | ]
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| 78 | <+> increase opcode
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| 79 | ] end if (char is not left bracket)
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| 80 | <+> increase opcode
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| 81 | ] end if (char is not right angle)
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| 82 | <+> increase opcode
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| 83 | ] end if (char is not left angle)
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| 84 | <+> increase opcode
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| 85 | ] end if (char is not dot)
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| 86 | <+> increase opcode
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| 87 | ] end if (char is not minus)
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| 88 | <+> increase opcode
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| 89 | ] end if (char is not comma)
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| 90 | <+> increase opcode
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| 91 | ] end if (char is not plus)
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| 92 | <+ increase opcode
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| 93 | [ if opcode is not zero
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| 94 | > move to next field
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| 95 | ] end if (opcode is not zero)
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| 96 | >>-, read in a new character
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| 97 | [<+>->+<] copy to previous and next field
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| 98 | >[+<]> if not null check if it's 0xff
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| 99 | ] end while not EOF
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| 100 |
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| 101 | <<[+] clear possible 0xff
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| 102 |
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| 103 | >>++++++++[<++++++++++>-]<++++< 84 bytes for ELF header
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| 104 | >++++++++++++< 12 bytes to initialize program
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| 105 | >++++++< 6 bytes to end program
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| 106 |
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| 107 | Calculate file size
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| 108 |
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| 109 | <<[<]> move to first opcode
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| 110 | [ while opcode exists
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| 111 | [<<+<+>>>-]<< copy to two previous fields
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| 112 | - decrease
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| 113 | [ if opcode is not plus
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| 114 | - decrease opcode
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| 115 | [ if opcode is not comma
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| 116 | - decrease opcode
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| 117 | [ if opcode is not minus
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| 118 | - decrease opcode
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| 119 | [ if opcode is not dot
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| 120 | - decrease opcode
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| 121 | [ if opcode is not left angle
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| 122 | - decrease opcode
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| 123 | [ if opcode is not right angle
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| 124 | - decrease opcode
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| 125 | [ if opcode is not left bracket
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| 126 | >>>[>]>+++++ indicate 5 bytes should be added
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| 127 | <<[<]-<< set indicator to minus one
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| 128 | -
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| 129 | ] end if (opcode is not left bracket)
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| 130 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 131 | [ else (opcode is left bracket)
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| 132 | >>>[>]>++++++++ indicate 8 bytes should be added
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| 133 | <<[<]-<< set indicator to minus one
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| 134 | -
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| 135 | ] end else (opcode is left bracket)
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| 136 | ] end if (opcode is not right angle)
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| 137 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 138 | [ else (opcode is right angle)
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| 139 | >>>[>]>+ indicate 1 byte should be added
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| 140 | <<[<]-<< set indicator to minus 1
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| 141 | -
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| 142 | ] end else (opcode is right angle)
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| 143 | ] end if (opcode is not left angle)
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| 144 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 145 | [ else (opcode is left angle)
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| 146 | >>>[>]>+ indicate 1 byte should be added
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| 147 | <<[<]-<< set indicator to minus 1
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| 148 | -
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| 149 | ] end else (opcode is left angle)
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| 150 | ] end if (opcode is not dot)
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| 151 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 152 | [ else (opcode is dot)
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| 153 | >>>[>]>++++++ indicate 6 bytes should be added
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| 154 | <<[<]-<< set indicator to minus 1
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| 155 | -
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| 156 | ] end else (opcode is dot)
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| 157 | ] end if (opcode is not minus)
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| 158 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 159 | [ else (opcode is minus)
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| 160 | >>>[>]>++ indicate 2 bytes should be added
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| 161 | <<[<]-<< set indicator to minus 1
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| 162 | -
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| 163 | ] end else (opcode is minus)
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| 164 | ] end if (opcode is not comma)
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| 165 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 166 | [ else (opcode is comma)
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| 167 | >>>[>]>++++++ indicate 6 bytes should be added
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| 168 | <<[<]-<< set indicator to minus 1
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| 169 | -
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| 170 | ] end else (opcode is comma)
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| 171 | ] end if (opcode is not plus)
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| 172 | >>[<-<->>+]<[>-<+]<+ copy indicator and increase
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| 173 | [ else (opcode is plus)
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| 174 | >>>[>]>++ indicate 2 bytes should be added
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| 175 | <<[<]-<< set indicator to minus 1
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| 176 | -
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| 177 | ] end else (opcode is plus)
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| 178 |
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| 179 | >>+>[>]> move to increment
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| 180 | [>+ increase byte 1
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| 181 | [>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-] copy byte 1
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| 182 | <[>-<[-]] if no overflow set field to minus 1
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| 183 | >+[- if overflow
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| 184 | <<<<+ increase byte 2
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| 185 | [>>>+>+<<<<-]>>>>[<<<<+>>>>-] copy byte 2
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| 186 | <[>-<[-]] if no overflow set field to minus 1
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| 187 | >+[- if overflow
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| 188 | <<<+ increase byte 3
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| 189 | [>>+>+<<<-]>>>[<<<+>>>-] copy byte 3
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| 190 | <[>-<[-]] if no overflow set field to minus 1
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| 191 | >+[- if overflow
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| 192 | <<+ increase byte 4
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| 193 | >>
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| 194 | ] end if
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| 195 | ] end if
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| 196 | ] end if
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| 197 | <<<<<<- decrease increment
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| 198 | ]
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| 199 |
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| 200 | <<[<]> move to next opcode
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| 201 | ]
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| 202 |
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| 203 | >>>>>> move behind file size
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| 204 |
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| 205 | >++++++++[<++++++++++++++++>-]<-. output ELF magic bytes
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| 206 | >+++++++[<-------->-]<--.
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| 207 | +++++++.------.
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| 208 |
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| 209 | [-]+...-.........++.--.+++.---.+.-... print rest of ELF header
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| 210 | >++++++++[<++++++++++>-]<++++.
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| 211 | >++++++[<+++++++>-]<++.[-]++++.++++.
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| 212 | >++++++[<+++++++>-]<++.[-]...........
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| 213 | >+++++++[<+++++++>-]<+++.>.++++
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| 214 | [<----->-]<.>.+.-.<++++++++.[-].....
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| 215 | +.-........>
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| 216 | ++++++++[<++++++++++++++++>-]<.>++++.
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| 217 | ++++.>.<<.>----.++++.
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| 218 | <<<<<.>.>.>. this is file size
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| 219 |
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| 220 | Copy the file size since we need it to initialize ecx
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| 221 | >[-]>[-]<< clear the fields
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| 222 | <<<[>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-] copy the bytes
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| 223 | <<<<[>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-]
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| 224 | <<<<[>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-]
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| 225 | <<<<[>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-]
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| 226 |
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| 227 | We have to add 30 000 = 0x75 30 to the file size
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| 228 | Start with 0x30
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| 229 |
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| 230 | >>>++++++[<++++++++>-]< set to 0x30
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| 231 | [ while increment is not 0
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| 232 | <<<<<<+ increase byte 1
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| 233 | [>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-] copy byte 1
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| 234 | <[>-<[-]] if no overflow set field to minus 1
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| 235 | >+[-
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| 236 | <<<<+ if overflow increase byte 2
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| 237 | [>>>+>+<<<<-]>>>>[<<<<+>>>>-] copy byte 2
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| 238 | <[>-<[-]] if no overflow set field to minus 1
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| 239 | >+[-
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| 240 | <<<+ if overflow increase byte 3
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| 241 | [>>+>+<<<-]>>>[<<<+>>>-] copy byte 3
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| 242 | <[>-<[-]] if no overflow set field to minus 1
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| 243 | >+[<<+>>-] if overflow increase byte 4
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| 244 | ]
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| 245 | ]
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| 246 | >- decrease increment
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| 247 | ]
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| 248 | <<<<<<. print first byte
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| 249 |
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| 250 | Now do 0x75 00
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| 251 | >>>>>>>
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| 252 | +++++++[<++++++++++++++++>-]<+++++ set increment
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| 253 | [ while increment is not 0
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| 254 | <<<<<+ increase byte 2
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| 255 | [>>>+>+<<<<-]>>>>[<<<<+>>>>-] copy byte 2
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| 256 | <[>-<[-]] if no overflow set field to minus 1
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| 257 | >+[-
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| 258 | <<<+ if overflow increase byte 3
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| 259 | [>>+>+<<<-]>>>[<<<+>>>-] copy byte 3
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| 260 | <[>-<[-]] if no overflow set field to minus 1
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| 261 | >+[<<+>>-] if overflow increase byte 4
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| 262 | ]
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| 263 | >- decrease increment
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| 264 | ]
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| 265 | <<<<<.>.>. print other 3 bytes
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| 266 |
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| 267 | [-]<[-]<[-]<[-] clear up
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| 268 | ++++++.------....++++++++++++++++. print rest of header
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| 269 | [-]..
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| 270 |
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| 271 | add 0x80 00 to file size
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| 272 | >++++++++[<++++++++++++++++>-]< set counter to 0x80
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| 273 | [<<<+ increase byte 2
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| 274 | [>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-] copy byte 2
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| 275 | <[>-<[-]] if no overflow set indicator to minus 1
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| 276 | >+[- if overflow
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| 277 | <<<<+ increase byte 3
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| 278 | [>>>+>+<<<<]>>>>[<<<<+>>>>-] copy byte 3
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| 279 | <[>-<[-]] if no overflow set indicator to minus 1
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| 280 | >+[<<<+>>>-] if overflow increase byte 4
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| 281 | ]
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| 282 | <<- decrease counter
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| 283 | ] loop until counter is zero
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| 284 |
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| 285 | add 0x04 00 00 to file size
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| 286 | ++++ set counter to 0x04
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| 287 | [<<+ increase byte 3
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| 288 | [>>>+>+<<<<-]>>>>[<<<<+>>>>-] copy byte 3
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| 289 | <[>-<[-]] if no overflow set indicator to minus 1
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| 290 | >+[<<<+>>>-] if overflow increase byte 4
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| 291 | <<- decrease counter
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| 292 | ] loop until counter is zero
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| 293 |
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| 294 | add 0x08 00 00 00 to file size
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| 295 | <++++++++>
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| 296 |
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| 297 | Initialize registers
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| 298 | >>+++++++[<+++++++>-]<. xor eax eax
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| 299 | >>++++++++++++[<++++++++++++++++>-]<.
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| 300 |
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| 301 | <.>>+++[<+++++++++>-]<. xor ebx ebx
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| 302 |
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| 303 | >++++[<-------->-]<--.<<<<<<.>.>.>. mov ecx filesize
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| 304 |
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| 305 | >>.>>+++++[<+++++>-]<. xor edx edx
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| 306 |
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| 307 | >++++[<<++++>>-]<<+. inc edx
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| 308 |
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| 309 | Now start compiling
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| 310 |
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| 311 | >[-]<[-]<[-]<[-]<[-]<[-]<[-] clean up
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| 312 | <<<<<<[<]> move to first instruction
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| 313 |
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| 314 | [ while opcode exists
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| 315 | - decrease opcode
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| 316 | [ if opcode is not plus
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| 317 | - decrease opcode
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| 318 | [ if opcode is not comma
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| 319 | - decrease opcode
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| 320 | [ if opcode is not minus
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| 321 | - decrease opcode
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| 322 | [ if opcode is not dot
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| 323 | - decrease opcode
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| 324 | [ if opcode is not left angle
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| 325 | - decrease opcode
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| 326 | [ if opcode is not right angle
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| 327 | - decrease opcode
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| 328 | [ if opcode is not left bracket
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| 329 | <++++[>------<-]>. output e9
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| 330 | [-] clear this field
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| 331 | >[>]>>>>>>>>[>>>>>>] move to end of loop size stack
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| 332 | -------->->->-<<< initialize increment
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| 333 | <<<<< move to byte 1 of size
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| 334 | [ while byte 1 is not zero
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| 335 | >>>>>- decrease byte 1
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| 336 | [>>>>+>+<<<<<-] copy byte 1
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| 337 | >>>>>[<<<<<+>>>>>-]
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| 338 | <[>-<[-]] if no underflow set field to minus 1
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| 339 | >+[- if underflow
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| 340 | <<<<- decrease byte 2
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| 341 | [>>>+>+<<<<-] copy byte 2
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| 342 | >>>>[<<<<+>>>>-]
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| 343 | <[>-<[-]] if no underflow set field to minus 1
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| 344 | >+[- if underflow
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| 345 | <<<- decrease byte 3
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| 346 | [>>+>+<<<-] copy byte 3
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| 347 | >>>[<<<+>>>-]
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| 348 | <[>-<[-]] if no underflow set field to minus 1
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| 349 | >+[-<<->>] if underflow decrease byte 4
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| 350 | ] end if
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| 351 | ] end if
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| 352 | <<<<<<<<<<- decrease byte 1 of size
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| 353 | ] end while
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| 354 | > move to byte 2 of size
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| 355 | [ while byte 2 is not zero
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| 356 | >>>>>- decrease byte 2
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| 357 | [>>>+>+<<<<-] copy byte two
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| 358 | >>>>[<<<<+>>>>-]
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| 359 | <[>-<[-]] if no underflow set field to minus 1
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| 360 | >+[- if underflow
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| 361 | <<<- decrease byte 3
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| 362 | [>>+>+<<<-] copy byte 3
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| 363 | >>>[<<<+>>>-]
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| 364 | <[>-<[-]] if no underflow set field to minus 1
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| 365 | >+[-<<->>] if underflow decrease byte 4
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| 366 | ] end if
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| 367 | <<<<<<<<<- decrease byte 2 of size
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| 368 | ] end while
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| 369 | > move to byte 3 of size
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| 370 | [ while byte 3 is not zero
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| 371 | >>>>>- decrease byte 3
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| 372 | [>>+>+<<<-] copy byte 3
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| 373 | >>>[<<<+>>>-]
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| 374 | <[>-<[-]] if no underflow set field to minus 1
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| 375 | >+[-<<->>] if underflow decrease byte 4
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| 376 | <<<<<<<<- decrease byte 3 of size
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| 377 | ]
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| 378 | > move to byte 4 of size
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| 379 | [ while byte 4 is not zero
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| 380 | >>>>>-<<<<<- decrease byte 4
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| 381 | ]
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| 382 | >->.>.>.>. print increment
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| 383 | [+]<[+]<[+]<[+] clear increment
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| 384 | <<<<<<- remove size from stack
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| 385 | <[<<<<<<]<<<<<<<<[<] move back to opcode
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| 386 | <-> set indicator to minus 1
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| 387 | ] end if (opcode is not left bracket)
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| 388 | <+ increase indicator
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| 389 | [ else (opcode is left bracket)
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| 390 | ++++++[>++++++++<-] set to 38
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| 391 | >++.---------. output 3a 31
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| 392 | <+++++++++++++++. output 0f
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| 393 | +[>+++++<-]>+++. output 84
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| 394 | [-] clear this byte
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| 395 | clear the byte counter
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| 396 | + set nesting level to one
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| 397 |
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| 398 | [ while nesting greater than 0
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| 399 | >[<<<+<+>>>>-] copy opcode before nesting level
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| 400 | <<<------- subtract 7 from opcode
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| 401 | [ if opcode is not left bracket
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| 402 | - decrease opcode
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| 403 | [ if opcode is not right bracket
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| 404 | [+] clear field
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| 405 | >-< set indicator to minus 1
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| 406 | ] end if opcode is not right braket
|
|---|
| 407 | >+ increase indicator
|
|---|
| 408 | [ else (opcode is right bracket)
|
|---|
| 409 | >-<- decrease nesting level
|
|---|
| 410 | ] end else (opcode is right bracket)
|
|---|
| 411 | -< set indicator to minus 1
|
|---|
| 412 | ] end if (opcode is not left bracket)
|
|---|
| 413 | >+ increase indicator
|
|---|
| 414 | [ else (opcode is left bracket)
|
|---|
| 415 | >+<- increase nesting level
|
|---|
| 416 | ] end else (opcode is left bracket)
|
|---|
| 417 | >[>+<-]> copy nesting to next field
|
|---|
| 418 | ] end while (nesting greater than 0)
|
|---|
| 419 | <<<< move to last opcode in loop
|
|---|
| 420 | [ while there are opcodes
|
|---|
| 421 | [>>>+>+<<<<-] copy the opcode twice
|
|---|
| 422 | >>> move to first copy
|
|---|
| 423 | - decrease opcode
|
|---|
| 424 | [ if opcode is not plus
|
|---|
| 425 | - decrease opcode
|
|---|
| 426 | [ if opcode is not comma
|
|---|
| 427 | - decrease opcode
|
|---|
| 428 | [ if opcode is not minus
|
|---|
| 429 | - decrease opcode
|
|---|
| 430 | [ if opcode is not dot
|
|---|
| 431 | - decrease opcode
|
|---|
| 432 | [ if opcode is not left angle
|
|---|
| 433 | - decrease opcode
|
|---|
| 434 | [ if opcode is not right angle
|
|---|
| 435 | - decrease opcode
|
|---|
| 436 | [ if opcode is not left bracket
|
|---|
| 437 | - then it must be right bracket
|
|---|
| 438 | set increment to five bytes
|
|---|
| 439 | <<+++++>->
|
|---|
| 440 | ] end if (opcode is not left bracket)
|
|---|
| 441 | <+ increase indicator
|
|---|
| 442 | [ else (opcode is left bracket)
|
|---|
| 443 | set increment to 8 bytes
|
|---|
| 444 | <++++++++>-
|
|---|
| 445 | ] end else (opcode is left bracket)
|
|---|
| 446 | -> set indicator to minus 1
|
|---|
| 447 | ] end if (opcode is not right angle)
|
|---|
| 448 | <+ increase indicator
|
|---|
| 449 | [ else (opcode is right angle)
|
|---|
| 450 | <+>- set increment to 1 byte
|
|---|
| 451 | ] end else (opcode is right angle)
|
|---|
| 452 | -> set indicator to minus 1
|
|---|
| 453 | ] end if (opcode is not left angle)
|
|---|
| 454 | <+ increase indicator
|
|---|
| 455 | [ else (opcode is left angle)
|
|---|
| 456 | <+>- set increment to 1 byte
|
|---|
| 457 | ] end else (opcode is left angle)
|
|---|
| 458 | -> set indicator to minus 1
|
|---|
| 459 | ] end else (opcode is not dot)
|
|---|
| 460 | <+ increase indicator
|
|---|
| 461 | [ else (opcode is dot)
|
|---|
| 462 | <++++++>- set increment to 6 bytes
|
|---|
| 463 | ] end else (opcode is dot)
|
|---|
| 464 | -> set indicator to minus 1
|
|---|
| 465 | ] end if (opcode is not minus)
|
|---|
| 466 | <+ increase indicator
|
|---|
| 467 | [ else (opcode is minus)
|
|---|
| 468 | <++>- set increment to two bytes
|
|---|
| 469 | ] end else (opcode is minus)
|
|---|
| 470 | -> set indicator to minus 1
|
|---|
| 471 | ] end if (opcode is not comma)
|
|---|
| 472 | <+ increase indicator
|
|---|
| 473 | [ else (opcode is comma)
|
|---|
| 474 | <++++++>- set increment to 6 bytes
|
|---|
| 475 | ] end else (opcode is comma)
|
|---|
| 476 | -> set indicator to minus 1
|
|---|
| 477 | ] end if (opcode is not plus)
|
|---|
| 478 | <+ increase indicator
|
|---|
| 479 | [ else (opcode is plus)
|
|---|
| 480 | <++>- set increment to 2 bytes
|
|---|
| 481 | ] end else (opcode is plus)
|
|---|
| 482 | <[>>>[>]>+<<[<]<<-] copy increment behind program
|
|---|
| 483 | >>>[>]> move to increment
|
|---|
| 484 | [ while increment is not zero
|
|---|
| 485 | >+ increase byte 1
|
|---|
| 486 | [>>>>+>+<<<<<-] copy byte 1
|
|---|
| 487 | >>>>>[<<<<<+>>>>>-]
|
|---|
| 488 | <[>-<[-]] if no overflow set field to minus 1
|
|---|
| 489 | >+[- if overflow
|
|---|
| 490 | <<<<+ increase byte 2
|
|---|
| 491 | [>>>+>+<<<<-] copy byte 2
|
|---|
| 492 | >>>>[<<<<+>>>>-]
|
|---|
| 493 | <[>-<[-]] if no overflow set field to minus 1
|
|---|
| 494 | >+[- if overflow
|
|---|
| 495 | <<<+ increase byte 3
|
|---|
| 496 | [>>+>+<<<-] copy byte 3
|
|---|
| 497 | >>>[<<<+>>>-]
|
|---|
| 498 | <[>-<[-]] if no overflow set field to minus 1
|
|---|
| 499 | >+[- if overflow
|
|---|
| 500 | <<+>> increase byte 4
|
|---|
| 501 | ]
|
|---|
| 502 | ] end if
|
|---|
| 503 | ] end if
|
|---|
| 504 | <<<<<<- decrease increment
|
|---|
| 505 | ] end while
|
|---|
| 506 | <<[<]<<<< move to next opcode
|
|---|
| 507 | ] end while opcode exists
|
|---|
| 508 | >>>>>[>]>>.>.>.>. output the loop increment
|
|---|
| 509 | <<< move to byte 1
|
|---|
| 510 | copy byte 1 on stack
|
|---|
| 511 | [>>>>>>[>>>>>>]>+<<[<<<<<<]<<<<<-]
|
|---|
| 512 | > move to byte 2
|
|---|
| 513 | copy byte 2 on stack
|
|---|
| 514 | [>>>>>[>>>>>>]>>+<<<[<<<<<<]<<<<-]
|
|---|
| 515 | > move to byte 3
|
|---|
| 516 | copy byte 3 on stack
|
|---|
| 517 | [>>>>[>>>>>>]>>>+<<<<[<<<<<<]<<<-]
|
|---|
| 518 | > move to byte 4
|
|---|
| 519 | copy byte 4 on stack
|
|---|
| 520 | [>>>[>>>>>>]>>>>+<<<<<[<<<<<<]<<-]
|
|---|
| 521 | set surrounding 1 bytes
|
|---|
| 522 | >>>[>>>>>>]+>>>>>+<<<<<<[<<<<<<]<<
|
|---|
| 523 | <<<<<<[<] move back to start of loop
|
|---|
| 524 | < move to indicator field
|
|---|
| 525 | ] end else (opcode is left bracket)
|
|---|
| 526 | -> set indicator to minus 1
|
|---|
| 527 | ] end if (opcode is not right angle)
|
|---|
| 528 | <+ increase indicator
|
|---|
| 529 | [ else (opcode is right angle)
|
|---|
| 530 | +++++++[>++++++++<-]>+ set to 41
|
|---|
| 531 | .[-]< output 41 and clear up
|
|---|
| 532 | ] end else (opcode is right angle)
|
|---|
| 533 | -> set indicator to minus 1
|
|---|
| 534 | ] end if (opcode is not left angle)
|
|---|
| 535 | <+ increase indicator
|
|---|
| 536 | [ else (opcode is left angle)
|
|---|
| 537 | +++++++[>+++++++++<-]>+. output 49
|
|---|
| 538 | [-]< clear up
|
|---|
| 539 | ] end else (opcode is left angle)
|
|---|
| 540 | -> set indicator to minus 1
|
|---|
| 541 | ] end if (opcode is not dot)
|
|---|
| 542 | <+ increase indicator
|
|---|
| 543 | [ else (opcode is dot)
|
|---|
| 544 | ++++++++++ set to b0
|
|---|
| 545 | [>++++++++++++++++<-]>. output b0
|
|---|
| 546 | <++++.>+++.<---. output 04 b3 01
|
|---|
| 547 | +[>+++++++++++++<-]>. output cd
|
|---|
| 548 | <+++++++[>-----------<-]>. output 80
|
|---|
| 549 | [-]< clear up
|
|---|
| 550 | ] end else (opcode is dot)
|
|---|
| 551 | -> set indicator to minus 1
|
|---|
| 552 | ] end if (opcode is not minus)
|
|---|
| 553 | <+ increase indicator
|
|---|
| 554 | [ else (opcode is minus)
|
|---|
| 555 | >--.++<++++++++.--------- output fe 09
|
|---|
| 556 | ] end else (opcode is minus)
|
|---|
| 557 | -> set indicator to minus 1
|
|---|
| 558 | ] end if (opcode is not comma)
|
|---|
| 559 | <+ increase indicator
|
|---|
| 560 | [ else (opcode is comma)
|
|---|
| 561 | ++++++++++[>++++++++++++++++<-] set to b0
|
|---|
| 562 | >.<+++.>+++.<---. output b0 03 b3 00
|
|---|
| 563 | ++[>+++++++++++++<-]>.< output cd
|
|---|
| 564 | +++++++[>-----------<-]>. output 80
|
|---|
| 565 | [-]< clear up
|
|---|
| 566 | ] end else (opcode is comma)
|
|---|
| 567 | -> set indicator to minus one
|
|---|
| 568 | ] end if (opcode is not plus)
|
|---|
| 569 | <+ increase indicator
|
|---|
| 570 | [ else (opcode is plus)
|
|---|
| 571 | ---.+++.- output fe 01
|
|---|
| 572 | ] end else (opcode is plus)
|
|---|
| 573 | >> move to next opcode
|
|---|
| 574 | ]
|
|---|
| 575 |
|
|---|
| 576 | [>]>
|
|---|
| 577 |
|
|---|
| 578 | Clean up
|
|---|
| 579 |
|
|---|
| 580 | >+++++++++++[<++++++++++++++++>-]<. mov al 1
|
|---|
| 581 | >+.
|
|---|
| 582 |
|
|---|
| 583 | <+++.>-. mov bl 0
|
|---|
| 584 |
|
|---|
| 585 | ++++[<++++++>-]<++. int 0x80
|
|---|
| 586 | >>++++++++[<++++++++++++++++>-]<.
|
|---|
