import from github

tools/scaninc/asm_file.cpp

@@ -0,0 +1,192 @@
+// 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();
+        }
+    }
+}