tumbledemerald-legacy/tools/scaninc/asm_file.cpp

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2022-05-19 19:14:13 +02:00
// Copyright(c) 2015-2017 YamaArashi
//
// 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.
#include <cstdio>
#include <string>
#include "scaninc.h"
#include "asm_file.h"
AsmFile::AsmFile(std::string path)
{
m_path = path;
FILE *fp = std::fopen(path.c_str(), "rb");
if (fp == NULL)
FATAL_ERROR("Failed to open \"%s\" for reading.\n", path.c_str());
std::fseek(fp, 0, SEEK_END);
m_size = std::ftell(fp);
m_buffer = new char[m_size];
std::rewind(fp);
if (std::fread(m_buffer, m_size, 1, fp) != 1)
FATAL_ERROR("Failed to read \"%s\".\n", path.c_str());
std::fclose(fp);
m_pos = 0;
m_lineNum = 1;
}
AsmFile::~AsmFile()
{
delete[] m_buffer;
}
IncDirectiveType AsmFile::ReadUntilIncDirective(std::string &path)
{
// At the beginning of each loop iteration, the current file position
// should be at the start of a line or at the end of the file.
for (;;)
{
SkipTabsAndSpaces();
IncDirectiveType incDirectiveType = IncDirectiveType::None;
char c = PeekChar();
if (c == '.' || c == '#')
{
m_pos++;
if (MatchIncDirective("incbin", path))
incDirectiveType = IncDirectiveType::Incbin;
else if (MatchIncDirective("include", path))
incDirectiveType = IncDirectiveType::Include;
}
for (;;)
{
int c = GetChar();
if (c == -1)
return incDirectiveType;
if (c == ';')
{
SkipEndOfLineComment();
break;
}
else if (c == '/' && PeekChar() == '*')
{
m_pos++;
SkipMultiLineComment();
}
else if (c == '"')
{
SkipString();
}
else if (c == '\n')
{
break;
}
}
if (incDirectiveType != IncDirectiveType::None)
return incDirectiveType;
}
}
std::string AsmFile::ReadPath()
{
int length = 0;
int startPos = m_pos;
for (;;)
{
int c = GetChar();
if (c == '"')
break;
if (c == -1)
FATAL_INPUT_ERROR("unexpected EOF in include string\n");
if (c == 0)
FATAL_INPUT_ERROR("unexpected NUL character in include string\n");
if (c == '\n')
FATAL_INPUT_ERROR("unexpected end of line character in include string\n");
// Don't bother allowing any escape sequences.
if (c == '\\')
FATAL_INPUT_ERROR("unexpected escape in include string\n");
length++;
if (length > SCANINC_MAX_PATH)
FATAL_INPUT_ERROR("path is too long");
}
return std::string(m_buffer + startPos, length);
}
void AsmFile::SkipEndOfLineComment()
{
int c;
do
{
c = GetChar();
} while (c != -1 && c != '\n');
}
void AsmFile::SkipMultiLineComment()
{
for (;;)
{
int c = GetChar();
if (c == '*')
{
if (PeekChar() == '/')
{
m_pos++;
return;
}
}
else if (c == -1)
{
return;
}
}
}
void AsmFile::SkipString()
{
for (;;)
{
int c = GetChar();
if (c == '"')
break;
if (c == -1)
FATAL_INPUT_ERROR("unexpected EOF in string\n");
if (c == '\\')
{
c = GetChar();
}
}
}