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Read a filename from standard input instead of embedding programs.

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This commit is contained in:
Aaron Helton
2022-05-29 13:39:42 -04:00
parent db477f87d3
commit c8a7a16a37
4 changed files with 179 additions and 61 deletions
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108
src/main.cpp
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@@ -1,70 +1,56 @@
#include <BFMachine.hpp>
#include <iostream>
#include <fstream>
#include <sstream>
int main()
#define USAGE_RETURN_ERROR 1
#define FILE_RETURN_ERROR 2
#define RETURN_SUCCESS 1
void printUsage()
{
std::cout << "Usage: bf <file>" << std::endl;
}
int main(int argc, char **argv)
{
BFMachine machine;
const char* instructions =
"[ This program prints \"Hello World!\" and a newline to the screen, its\n"
" length is 106 active command characters. [It is not the shortest.]\n"
"\n"
" This loop is an \"initial comment loop\", a simple way of adding a comment\n"
" to a BF program such that you don't have to worry about any command\n"
" characters. Any \".\", \",\", \"+\", \"-\", \"<\" and \">\" characters are simply\n"
" ignored, the \"[\" and \"]\" characters just have to be balanced. This\n"
" loop and the commands it contains are ignored because the current cell\n"
" defaults to a value of 0; the 0 value causes this loop to be skipped.\n"
"]\n"
"++++++++ Set Cell #0 to 8\n"
"[\n"
" >++++ Add 4 to Cell #1; this will always set Cell #1 to 4\n"
" [ as the cell will be cleared by the loop\n"
" >++ Add 2 to Cell #2\n"
" >+++ Add 3 to Cell #3\n"
" >+++ Add 3 to Cell #4\n"
" >+ Add 1 to Cell #5\n"
" <<<<- Decrement the loop counter in Cell #1\n"
" ] Loop until Cell #1 is zero; number of iterations is 4\n"
" >+ Add 1 to Cell #2\n"
" >+ Add 1 to Cell #3\n"
" >- Subtract 1 from Cell #4\n"
" >>+ Add 1 to Cell #6\n"
" [<] Move back to the first zero cell you find; this will\n"
" be Cell #1 which was cleared by the previous loop\n"
" <- Decrement the loop Counter in Cell #0\n"
"] Loop until Cell #0 is zero; number of iterations is 8\n"
"\n"
"The result of this is:\n"
"Cell no : 0 1 2 3 4 5 6\n"
"Contents: 0 0 72 104 88 32 8\n"
"Pointer : ^\n"
"\n"
">>. Cell #2 has value 72 which is 'H'\n"
">---. Subtract 3 from Cell #3 to get 101 which is 'e'\n"
"+++++++..+++. Likewise for 'llo' from Cell #3\n"
">>. Cell #5 is 32 for the space\n"
"<-. Subtract 1 from Cell #4 for 87 to give a 'W'\n"
"<. Cell #3 was set to 'o' from the end of 'Hello'\n"
"+++.------.--------. Cell #3 for 'rl' and 'd'\n"
">>+. Add 1 to Cell #5 gives us an exclamation point\n"
">++. And finally a newline from Cell #6";
machine.load(instructions);
int ret = machine.execute();
if(ret != 0)
if(argc != 2)
{
std::cout << "An error occurred. Error is: ";
switch(ret)
{
case RETURN_INVALID_INSTRUCTION:
std::cout << "Invalid Instruction"; break;
case RETURN_INVALID_MEMORY_ADDRESS:
std::cout << "Invalid Memory Access"; break;
default:
std::cout << "Unknown Error"; break;
}
std::cout << std::endl;
std::cout.flush();
printUsage();
return USAGE_RETURN_ERROR;
}
char *filename = argv[1];
std::ifstream file(filename);
if(file)
{
std::stringstream text;
text << file.rdbuf();
file.close();
machine.load(text.str().c_str());
int ret = machine.execute();
if(ret != 0)
{
std::cout << "An error occurred. Error is: ";
switch(ret)
{
case BF_RETURN_INVALID_INSTRUCTION:
std::cout << "Invalid Instruction"; break;
case BF_RETURN_INVALID_MEMORY_ADDRESS:
std::cout << "Invalid Memory Access"; break;
default:
std::cout << "Unknown Error"; break;
}
std::cout << std::endl;
}
return ret;
}
else
{
std::cerr << "There was an error reading from the file." << std::endl;
return FILE_RETURN_ERROR;
}
return ret;
}

43
test/hello.bf Normal file
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[ This program prints "Hello World!" and a newline to the screen, its
length is 106 active command characters. [It is not the shortest.]
This loop is an "initial comment loop", a simple way of adding a comment
to a BF program such that you don't have to worry about any command
characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
ignored, the "[" and "]" characters just have to be balanced. This
loop and the commands it contains are ignored because the current cell
defaults to a value of 0; the 0 value causes this loop to be skipped.
]
++++++++ Set Cell #0 to 8
[
>++++ Add 4 to Cell #1; this will always set Cell #1 to 4
[ as the cell will be cleared by the loop
>++ Add 2 to Cell #2
>+++ Add 3 to Cell #3
>+++ Add 3 to Cell #4
>+ Add 1 to Cell #5
<<<<- Decrement the loop counter in Cell #1
] Loop until Cell #1 is zero; number of iterations is 4
>+ Add 1 to Cell #2
>+ Add 1 to Cell #3
>- Subtract 1 from Cell #4
>>+ Add 1 to Cell #6
[<] Move back to the first zero cell you find; this will
be Cell #1 which was cleared by the previous loop
<- Decrement the loop Counter in Cell #0
] Loop until Cell #0 is zero; number of iterations is 8
The result of this is:
Cell no : 0 1 2 3 4 5 6
Contents: 0 0 72 104 88 32 8
Pointer : ^
>>. Cell #2 has value 72 which is 'H'
>---. Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++. Likewise for 'llo' from Cell #3
>>. Cell #5 is 32 for the space
<-. Subtract 1 from Cell #4 for 87 to give a 'W'
<. Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------. Cell #3 for 'rl' and 'd'
>>+. Add 1 to Cell #5 gives us an exclamation point
>++. And finally a newline from Cell #6

38
test/life.bf Normal file
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[life.b -- John Horton Conway's Game of Life
(c) 2021 Daniel B. Cristofani
http://brainfuck.org/]
>>>->+>+++++>(++++++++++)[[>>>+<<<-]>+++++>+>>+[<<+>>>>>+<<<-]<-]>>>>[
[>>>+>+<<<<-]+++>>+[<+>>>+>+<<<-]>>[>[[>>>+<<<-]<]<<++>+>>>>>>-]<-
]+++>+>[[-]<+<[>+++++++++++++++++<-]<+]>>[
[+++++++++.-------->>>]+[-<<<]>>>[>>,----------[>]<]<<[
<<<[
>--[<->>+>-<<-]<[[>>>]+>-[+>>+>-]+[<<<]<-]>++>[<+>-]
>[[>>>]+[<<<]>>>-]+[->>>]<-[++>]>[------<]>+++[<<<]>
]<
]>[
-[+>>+>-]+>>+>>>+>[<<<]>->+>[
>[->+>+++>>++[>>>]+++<<<++<<<++[>>>]>>>]<<<[>[>>>]+>>>]
<<<<<<<[<<++<+[-<<<+]->++>>>++>>>++<<<<]<<<+[-<<<+]+>->>->>
]<<+<<+<<<+<<-[+<+<<-]+<+[
->+>[-<-<<[<<<]>[>>[>>>]<<+<[<<<]>-]]
<[<[<[<<<]>+>>[>>>]<<-]<[<<<]]>>>->>>[>>>]+>
]>+[-<<[-]<]-[
[>>>]<[<<[<<<]>>>>>+>[>>>]<-]>>>[>[>>>]<<<<+>[<<<]>>-]>
]<<<<<<[---<-----[-[-[<->>+++<+++++++[-]]]]<+<+]>
]>>
]
[This program simulates the Game of Life cellular automaton.
It duplicates the interface of the classic program at
http://www.linusakesson.net/programming/brainfuck/index.php,
but this program was written from scratch.
Type e.g. "be" to toggle the fifth cell in the second row, "q" to quit,
or a bare linefeed to advance one generation.
Grid wraps toroidally. Board size in parentheses in first line (2-166 work).
This program is licensed under a Creative Commons Attribution-ShareAlike 4.0
International License (http://creativecommons.org/licenses/by-sa/4.0/).]

51
test/tictactoe.bf Normal file
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[tictactoe.b -- play tic-tac-toe
(c) 2020 Daniel B. Cristofani
http://brainfuck.org/
This program is licensed under a Creative Commons Attribution-ShareAlike 4.0
International License (http://creativecommons.org/licenses/by-sa/4.0/).]
--->--->>>>->->->>>>>-->>>>>>>>>>>>>>>>>>+>>++++++++++[
<<++[
--<+<<+<<+>>>>[
>[<->>+++>>[-]+++<<<+[<++>>+<--]]+>+++++[>>+++++++++<<-]
>>++++.[-]>>+[<<<<+>>+>>-]<<<<<<[>+<-]<<
]++++++++++.[-]>++
]-->>[-->[-]>]<<[
>>--[
-[
-[
-----[>+>+++++++<<+]-->>-.----->,[<->-]<[[<]+[->>]<-]<[<<,[-]]>>>>
]>
]<[
>-[+<+++]+<+++[+[---->]+<<<<<<[>>]<[-]]
>[<+[---->]++[<]<[>]>[[>]+>+++++++++<<-[<]]]>[>>>>]
]<[
-[[>+>+<<-]>[<+>-]++>+>>]<[<<++[-->>[-]]>[[-]>[<<+>>-]>]]
]<[
[[<<]-[>>]<+<-]>[-<+]<<[<<]-<[>[+>>]>[>]>[-]]
>[[+>>]<-->>[>]+>>>]
]<[
-[
--[+<<<<--[+>[-]>[<<+>+>-]<<[>>+<<-]]++[>]]
<<[>+>+<<-]>--[<+>-]++>>>
]<[<<<[-]+++>[-]>[<+>>>+<<-]+>>>]
]<[
+[[<]<<[<<]-<->>+>[>>]>[>]<-]+[-<+]<++[[>+<-]++<[<<->>+]<++]<
<<<<<< +> > >+> > >+[
<<< ->+>+>+[
<<<<<<< +>->+> > >->->+[
<<<<< ->+>+> >+>+[
<<<< ->->+>->+[
<<<<<<<<+>-> >+> > >->+>+[
<<<<< -> >+> >->+[
<<<< +>->+> >+]]]]]]]
+++[[>+<-]<+++]--->>[-[<->-]<++>>]++[[<->-]>>]>[>]
]<
]
]<
]
[This program plays tic-tac-toe. I've given it the first move. It needs
interactive i/o, e.g. a command-line brainfuck interpreter or a brainfuck
compiler that produces command-line executables. At the '>' prompt, enter
the number of an empty space, followed by a linefeed, to play a move there.]