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MyString.h
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MyString.h
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// Clavier+
// Keyboard shortcuts manager
//
// Copyright (C) 2000-2008 Guillaume Ryder
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// String: wrapper for a TCHAR character buffer.
#pragma once
#include <stdarg.h>
#include "I18n.h"
namespace MyStringTest {
class StringTest;
}
extern HANDLE e_heap;
// Indicates whether a character buffer is null or empty.
inline bool strIsEmpty(LPCTSTR src) {
return !src || !*src;
}
// Copies a given number of character from a string to a character buffer.
// The destination character buffer can overlap with the source one.
inline void strMove(LPTSTR dest, LPCTSTR src, int length) {
while (length > 0) {
length--;
*dest++ = *src++;
}
}
class String {
friend class ::MyStringTest::StringTest;
public:
typedef TCHAR* STR;
typedef const TCHAR* CSTR;
operator CSTR () const {
return getSafe();
}
int getBufferSize() const {
return m_buf_length;
}
//----------------------------------------------------------------------
// Constructors, destructor
//----------------------------------------------------------------------
String() : m_strbuf(nullptr), m_buf_length(0) {}
String(CSTR strbuf) : String(strbuf, lstrlen(strbuf)) {}
String(CSTR strbuf, int length) {
if (length <= 0) {
m_strbuf = nullptr;
m_buf_length = 0;
} else {
length++;
alloc(length);
StringCchCopy(m_strbuf, length, strbuf);
}
}
String(const String& str) : String(CSTR(str)) {}
String(String&& str) {
m_strbuf = str.m_strbuf;
m_buf_length = str.m_buf_length;
str.m_strbuf = nullptr;
str.m_buf_length = 0;
}
String(int resource_id) : m_strbuf(nullptr), m_buf_length(0) {
loadString(resource_id);
}
~String() {
destroy();
}
//----------------------------------------------------------------------
// Affectation
//----------------------------------------------------------------------
String& operator = (const String& str) {
if (&str != this) {
affect(CSTR(str));
}
return *this;
}
String& operator = (CSTR strbuf) {
if (strIsEmpty(strbuf)) {
empty();
} else if (isOverlapping(strbuf)) {
const int buf_length = lstrlen(strbuf) + 1;
if (m_buf_length < buf_length) {
const STR strbuf_new = allocNew(buf_length);
StringCchCopy(strbuf_new, buf_length, strbuf);
destroy();
m_strbuf = strbuf_new;
} else {
strMove(m_strbuf, strbuf, buf_length);
}
} else {
affect(strbuf);
}
return *this;
}
//----------------------------------------------------------------------
// Appending
//----------------------------------------------------------------------
String& operator += (CSTR input_strbuf) {
if (isEmpty()) {
*this = input_strbuf;
} else if (!strIsEmpty(input_strbuf)) {
if (isOverlapping(input_strbuf)) {
const int old_length = getLength();
const int input_self_index = int(input_strbuf - m_strbuf);
const int input_length = old_length - input_self_index;
reallocIfNeeded(old_length + input_length + 1);
for (int i = 0; i < input_length; i++) {
m_strbuf[old_length + i] = m_strbuf[input_self_index + i];
}
m_strbuf[old_length + input_length] = 0;
} else {
const int length = getLength();
const int input_buf_length = lstrlen(input_strbuf) + 1;
reallocIfNeeded(length + input_buf_length);
StringCchCopy(m_strbuf + length, input_buf_length, input_strbuf);
}
}
return *this;
}
String& operator += (TCHAR c) {
appendChar(c);
return *this;
}
//----------------------------------------------------------------------
// Get
//----------------------------------------------------------------------
STR get() {
return m_strbuf;
}
CSTR getSafe() const {
static constexpr TCHAR kEmptyString[] = { 0 };
return (m_strbuf) ? m_strbuf : kEmptyString;
}
TCHAR& operator [] (int offset) {
return m_strbuf[offset];
}
TCHAR& operator [] (size_t offset) {
return m_strbuf[offset];
}
int getLength() const {
return lstrlen(m_strbuf);
}
bool isEmpty() const {
return strIsEmpty(m_strbuf);
}
bool isSome() const {
return m_strbuf && *m_strbuf;
}
//----------------------------------------------------------------------
// Operations
//----------------------------------------------------------------------
STR getBuffer(int buf_length) {
reallocIfNeeded(buf_length);
return m_strbuf;
}
void empty() {
destroy();
m_strbuf = nullptr;
m_buf_length = 0;
}
bool loadString(UINT id) {
const i18n::STRING_RESOURCE *const resource = i18n::loadStringResource(id);
if (!resource) {
empty();
return false;
}
int buf_length = resource->length + 1;
resource->copy(getBuffer(buf_length), buf_length);
return true;
}
private:
STR m_strbuf;
int m_buf_length;
inline void alloc(int buf_length) {
m_strbuf = allocNew(buf_length);
}
inline STR allocNew(int buf_length) {
m_buf_length = buf_length | 15; // Allocate up to 15 bytes more than requested.
return bufferAlloc(m_buf_length);
}
void reallocIfNeeded(int buf_length) {
if (buf_length > m_buf_length) {
buf_length *= 2;
m_strbuf = bufferRealloc(m_strbuf, buf_length);
if (!m_buf_length) {
*m_strbuf = 0;
}
m_buf_length = buf_length;
}
}
inline void destroy() {
bufferFree(m_strbuf);
}
void affect(CSTR strbuf) {
if (strIsEmpty(strbuf)) {
empty();
} else {
const int buf_length = lstrlen(strbuf) + 1;
if (m_buf_length < buf_length) {
destroy();
alloc(buf_length);
}
StringCchCopy(m_strbuf, m_buf_length, strbuf);
}
}
inline void appendChar(TCHAR chr) {
const int length = getLength();
reallocIfNeeded(length + 2);
m_strbuf[length] = chr;
m_strbuf[length + 1] = 0;
}
inline bool isOverlapping(CSTR strbuf) const {
return m_strbuf <= strbuf && strbuf < m_strbuf + m_buf_length;
}
private:
static STR bufferAlloc(int buf_length) {
return STR(HeapAlloc(e_heap, /* dwFlags= */ 0, buf_length * sizeof(TCHAR)));
}
static void bufferFree(STR strbuf) {
HeapFree(e_heap, /* dwFlags= */ 0, strbuf);
}
static STR bufferRealloc(STR strbuf, int buf_length) {
return strbuf
? STR(HeapReAlloc(e_heap, /* dwFlags= */ 0, strbuf, buf_length * sizeof(TCHAR)))
: bufferAlloc(buf_length);
}
};
#ifdef _DEBUG
inline String StringPrintf(LPCTSTR format, ...) {
TCHAR result[1024];
va_list args;
va_start(args, format);
vswprintf(result, arrayLength(result), format, args);
va_end(args);
return result;
}
#endif // _DEBUG