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@watamario15
watamario15 committed Sep 9, 2022
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3 changes: 3 additions & 0 deletions .gitignore
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/.vscode/
/*.o
/*.exe
21 changes: 21 additions & 0 deletions LICENSE
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MIT License

Copyright (c) 2022 watamario15

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
369 changes: 369 additions & 0 deletions bf.cpp
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#ifdef _MSC_VER
#define PRIu64 "I64u"
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#else
#define PRIu64 "zu"
#endif

#include "bf.hpp"

#include <cstring>
#include <stdexcept>

void bf::reset() {
progIndex = 0;
inIndex = 0;
memset(memory, 0, sizeof(memory));
memIndex = 0;
}

void bf::reset(size_t _progLen, const char *_program, size_t _inLen,
const unsigned char *_input) {
if (program) delete[] program;
if (_progLen == 0 || !_program) {
program = NULL;
progLen = 0;
} else {
program = new char[_progLen];
memcpy(program, _program, _progLen);
progLen = _progLen;
}
progIndex = 0;

if (input) delete[] input;
if (_inLen == 0 || !_input) {
input = NULL;
inLen = 0;
} else {
input = new unsigned char[_inLen];
memcpy(input, _input, _inLen);
inLen = _inLen;
}
inIndex = 0;

memset(memory, 0, sizeof(memory));
memIndex = 0;

signedness = false;
}

void bf::reset(size_t _progLen, const char *_program, size_t _inLen,
const signed char *_input) {
if (program) delete[] program;
if (_progLen == 0 || !_program) {
program = NULL;
progLen = 0;
} else {
program = new char[_progLen];
memcpy(program, _program, _progLen);
progLen = _progLen;
}
progIndex = 0;

if (input) delete[] input;
if (_inLen == 0 || !_input) {
input = NULL;
inLen = 0;
} else {
input = new unsigned char[_inLen]; // reinterpret later
memcpy(input, _input, _inLen);
inLen = _inLen;
}
inIndex = 0;

memset(memory, 0, sizeof(memory));
memIndex = 0;

signedness = true;
}

void bf::setBehavior(enum noinput_t _noInput, bool _wrapInt, bool _wrapPtr) {
noInput = _noInput;
wrapInt = _wrapInt;
wrapPtr = _wrapPtr;
}

bool bf::next(unsigned char *_output, bool *_didOutput) {
if (signedness) {
throw std::invalid_argument(
"Call this function after resetting with the unsigned version of `reset`.");
}

*_didOutput = false;

if (progIndex >= progLen) {
return true;
}

switch (program[progIndex]) {
case '>':
if (memIndex != sizeof(memory) - 1) {
++memIndex;
} else if (wrapPtr) {
memIndex = 0;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '>' used when the memory pointer is 29999.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '<':
if (memIndex != 0) {
--memIndex;
} else if (wrapPtr) {
memIndex = sizeof(memory) - 1;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '<' used when the memory pointer is 0.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '+':
if (memory[memIndex] < 255) {
++memory[memIndex];
} else if (wrapInt) {
memory[memIndex] = 0;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '+' used when the pointed memory is 255.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '-':
if (memory[memIndex] > 0) {
--memory[memIndex];
} else if (wrapInt) {
memory[memIndex] = 255;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '-' used when the pointed memory is 0.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '.':
*_output = memory[memIndex];
*_didOutput = true;
break;

case ',':
if (inIndex >= inLen) {
if (noInput == NOINPUT_ZERO) {
memory[memIndex] = 0;
} else if (noInput == NOINPUT_FF) {
memory[memIndex] = 255;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction ',' used when the input stream is empty.",
progIndex);
throw std::invalid_argument(errorMsg);
}
} else {
memory[memIndex] = input[inIndex];
++inIndex;
}
break;

case '[':
if (memory[memIndex] == 0) {
size_t bracketIndex = progIndex++;
int ketCnt = 0;
while (progIndex < progLen) {
if (program[progIndex] == ']') {
if (ketCnt == 0) {
break; // match
} else {
--ketCnt; // recursive bracket
}
}
if (program[progIndex] == '[') ketCnt++;
++progIndex;
}
if (progIndex >= progLen) {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": No matching closing bracket.", bracketIndex);
throw std::invalid_argument(errorMsg);
}
}
break;

case ']':
if (memory[memIndex] != 0) {
size_t bracketIndex = progIndex--;
int braCnt = 0;
while (true) {
if (program[progIndex] == '[') {
if (braCnt == 0) {
break; // match
} else {
--braCnt; // recursive bracket
}
}
if (program[progIndex] == ']') braCnt++;
if (progIndex == 0) break;
--progIndex;
}
if (progIndex <= 0 && (program[progIndex] != '[' || braCnt != 0)) {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": No matching opening bracket.", bracketIndex);
throw std::invalid_argument(errorMsg);
}
}
break;
}

++progIndex;

return false;
}

bool bf::next(signed char *_output, bool *_didOutput) {
if (!signedness) {
throw std::invalid_argument(
"Call this function after resetting with the signed version of `reset`.");
}

*_didOutput = false;
signed char *signedMem = (signed char *)memory, *signedIn = (signed char *)input;

if (progIndex >= progLen) {
return true;
}

switch (program[progIndex]) {
case '>':
if (memIndex != sizeof(memory) - 1) {
++memIndex;
} else if (wrapPtr) {
memIndex = 0;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '>' used when the memory pointer is 29999.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '<':
if (memIndex != 0) {
--memIndex;
} else if (wrapPtr) {
memIndex = sizeof(memory) - 1;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '<' used when the memory pointer is 0.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '+':
if (signedMem[memIndex] < 127) {
++signedMem[memIndex];
} else if (wrapInt) {
signedMem[memIndex] = -128;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '+' used when the pointed memory is 127.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '-':
if (signedMem[memIndex] > -128) {
--signedMem[memIndex];
} else if (wrapInt) {
signedMem[memIndex] = 127;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction '-' used when the pointed memory is -128.",
progIndex);
throw std::invalid_argument(errorMsg);
}
break;

case '.':
*_output = signedMem[memIndex];
*_didOutput = true;
break;

case ',':
if (inIndex >= inLen) {
if (noInput == NOINPUT_ZERO) {
signedMem[memIndex] = 0;
} else if (noInput == NOINPUT_FF) {
signedMem[memIndex] = -1;
} else {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": Instruction ',' used when the input stream is empty.",
progIndex);
throw std::invalid_argument(errorMsg);
}
} else {
signedMem[memIndex] = signedIn[inIndex];
++inIndex;
}
break;

case '[':
if (signedMem[memIndex] == 0) {
size_t bracketIndex = progIndex++;
int ketCnt = 0;
while (progIndex < progLen) {
if (program[progIndex] == ']') {
if (ketCnt == 0) {
break; // match
} else {
--ketCnt; // recursive bracket
}
}
if (program[progIndex] == '[') ketCnt++;
++progIndex;
}
if (progIndex >= progLen) {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": No matching closing bracket.", bracketIndex);
throw std::invalid_argument(errorMsg);
}
}
break;

case ']':
if (signedMem[memIndex] != 0) {
size_t bracketIndex = progIndex--;
int braCnt = 0;
while (true) {
if (program[progIndex] == '[') {
if (braCnt == 0) {
break; // match
} else {
--braCnt; // recursive bracket
}
}
if (program[progIndex] == ']') braCnt++;
if (progIndex == 0) break;
--progIndex;
}
if (progIndex <= 0 && (program[progIndex] != '[' || braCnt != 0)) {
char errorMsg[128];
sprintf(errorMsg, "%" PRIu64 ": No matching opening bracket.", bracketIndex);
throw std::invalid_argument(errorMsg);
}
}
break;
}

++progIndex;

return false;
}
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