mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-24 02:36:27 +00:00
388e4b65bf
This includes both an implementation and some basic unit tests for the above mentioned functions. svn-id: r48953
823 lines
18 KiB
C++
823 lines
18 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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#include "common/str.h"
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#include "common/hash-str.h"
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#include "common/util.h"
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#include "common/memorypool.h"
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#include <stdarg.h>
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#if !defined(__SYMBIAN32__)
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#include <new>
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#endif
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namespace Common {
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MemoryPool *g_refCountPool = 0; // FIXME: This is never freed right now
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static uint32 computeCapacity(uint32 len) {
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// By default, for the capacity we use the next multiple of 32
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return ((len + 32 - 1) & ~0x1F);
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}
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String::String(const char *str) : _size(0), _str(_storage) {
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if (str == 0) {
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_storage[0] = 0;
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_size = 0;
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} else
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initWithCStr(str, strlen(str));
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}
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String::String(const char *str, uint32 len) : _size(0), _str(_storage) {
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initWithCStr(str, len);
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}
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String::String(const char *beginP, const char *endP) : _size(0), _str(_storage) {
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assert(endP >= beginP);
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initWithCStr(beginP, endP - beginP);
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}
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void String::initWithCStr(const char *str, uint32 len) {
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assert(str);
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// Init _storage member explicitly (ie. without calling its constructor)
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// for GCC 2.95.x compatibility (see also tracker item #1602879).
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_storage[0] = 0;
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_size = len;
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if (len >= _builtinCapacity) {
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// Not enough internal storage, so allocate more
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_extern._capacity = computeCapacity(len+1);
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_extern._refCount = 0;
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_str = new char[_extern._capacity];
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assert(_str != 0);
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}
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// Copy the string into the storage area
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memmove(_str, str, len);
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_str[len] = 0;
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}
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String::String(const String &str)
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: _size(str._size) {
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if (str.isStorageIntern()) {
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// String in internal storage: just copy it
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memcpy(_storage, str._storage, _builtinCapacity);
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_str = _storage;
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} else {
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// String in external storage: use refcount mechanism
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str.incRefCount();
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_extern._refCount = str._extern._refCount;
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_extern._capacity = str._extern._capacity;
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_str = str._str;
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}
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assert(_str != 0);
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}
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String::String(char c)
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: _size(0), _str(_storage) {
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_storage[0] = c;
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_storage[1] = 0;
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// TODO/FIXME: There is no reason for the following check -- we *do*
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// allow strings to contain 0 bytes!
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_size = (c == 0) ? 0 : 1;
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}
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String::~String() {
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decRefCount(_extern._refCount);
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}
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void String::makeUnique() {
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ensureCapacity(_size, true);
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}
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/**
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* Ensure that enough storage is available to store at least new_size
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* characters plus a null byte. In addition, if we currently share
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* the storage with another string, unshare it, so that we can safely
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* write to the storage.
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*/
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void String::ensureCapacity(uint32 new_size, bool keep_old) {
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bool isShared;
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uint32 curCapacity, newCapacity;
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char *newStorage;
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int *oldRefCount = _extern._refCount;
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if (isStorageIntern()) {
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isShared = false;
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curCapacity = _builtinCapacity;
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} else {
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isShared = (oldRefCount && *oldRefCount > 1);
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curCapacity = _extern._capacity;
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}
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// Special case: If there is enough space, and we do not share
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// the storage, then there is nothing to do.
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if (!isShared && new_size < curCapacity)
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return;
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if (isShared && new_size < _builtinCapacity) {
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// We share the storage, but there is enough internal storage: Use that.
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newStorage = _storage;
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newCapacity = _builtinCapacity;
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} else {
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// We need to allocate storage on the heap!
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// Compute a suitable new capacity limit
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newCapacity = MAX(curCapacity * 2, computeCapacity(new_size+1));
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// Allocate new storage
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newStorage = new char[newCapacity];
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assert(newStorage);
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}
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// Copy old data if needed, elsewise reset the new storage.
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if (keep_old) {
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assert(_size < newCapacity);
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memcpy(newStorage, _str, _size + 1);
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} else {
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_size = 0;
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newStorage[0] = 0;
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}
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// Release hold on the old storage ...
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decRefCount(oldRefCount);
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// ... in favor of the new storage
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_str = newStorage;
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if (!isStorageIntern()) {
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// Set the ref count & capacity if we use an external storage.
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// It is important to do this *after* copying any old content,
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// else we would override data that has not yet been copied!
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_extern._refCount = 0;
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_extern._capacity = newCapacity;
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}
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}
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void String::incRefCount() const {
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assert(!isStorageIntern());
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if (_extern._refCount == 0) {
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if (g_refCountPool == 0) {
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g_refCountPool = new MemoryPool(sizeof(int));
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assert(g_refCountPool);
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}
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_extern._refCount = (int *)g_refCountPool->allocChunk();
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*_extern._refCount = 2;
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} else {
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++(*_extern._refCount);
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}
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}
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void String::decRefCount(int *oldRefCount) {
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if (isStorageIntern())
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return;
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if (oldRefCount) {
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--(*oldRefCount);
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}
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if (!oldRefCount || *oldRefCount <= 0) {
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// The ref count reached zero, so we free the string storage
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// and the ref count storage.
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if (oldRefCount) {
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assert(g_refCountPool);
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g_refCountPool->freeChunk(oldRefCount);
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}
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delete[] _str;
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// Even though _str points to a freed memory block now,
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// we do not change its value, because any code that calls
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// decRefCount will have to do this afterwards anyway.
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}
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}
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String &String::operator=(const char *str) {
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uint32 len = strlen(str);
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ensureCapacity(len, false);
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_size = len;
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memmove(_str, str, len + 1);
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return *this;
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}
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String &String::operator=(const String &str) {
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if (&str == this)
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return *this;
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if (str.isStorageIntern()) {
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decRefCount(_extern._refCount);
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_size = str._size;
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_str = _storage;
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memcpy(_str, str._str, _size + 1);
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} else {
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str.incRefCount();
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decRefCount(_extern._refCount);
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_extern._refCount = str._extern._refCount;
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_extern._capacity = str._extern._capacity;
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_size = str._size;
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_str = str._str;
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}
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return *this;
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}
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String &String::operator=(char c) {
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decRefCount(_extern._refCount);
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_str = _storage;
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_size = 1;
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_str[0] = c;
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_str[1] = 0;
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return *this;
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}
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String &String::operator+=(const char *str) {
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if (_str <= str && str <= _str + _size)
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return operator+=(Common::String(str));
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int len = strlen(str);
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if (len > 0) {
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ensureCapacity(_size + len, true);
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memcpy(_str + _size, str, len + 1);
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_size += len;
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}
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return *this;
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}
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String &String::operator+=(const String &str) {
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if (&str == this)
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return operator+=(Common::String(str));
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int len = str._size;
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if (len > 0) {
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ensureCapacity(_size + len, true);
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memcpy(_str + _size, str._str, len + 1);
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_size += len;
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}
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return *this;
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}
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String &String::operator+=(char c) {
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ensureCapacity(_size + 1, true);
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_str[_size++] = c;
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_str[_size] = 0;
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return *this;
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}
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bool String::hasPrefix(const String &x) const {
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return hasPrefix(x.c_str());
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}
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bool String::hasPrefix(const char *x) const {
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assert(x != 0);
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// Compare x with the start of _str.
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const char *y = c_str();
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while (*x && *x == *y) {
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++x;
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++y;
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}
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// It's a prefix, if and only if all letters in x are 'used up' before
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// _str ends.
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return *x == 0;
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}
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bool String::hasSuffix(const String &x) const {
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return hasSuffix(x.c_str());
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}
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bool String::hasSuffix(const char *x) const {
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assert(x != 0);
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// Compare x with the end of _str.
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const uint32 x_size = strlen(x);
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if (x_size > _size)
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return false;
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const char *y = c_str() + _size - x_size;
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while (*x && *x == *y) {
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++x;
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++y;
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}
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// It's a suffix, if and only if all letters in x are 'used up' before
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// _str ends.
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return *x == 0;
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}
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bool String::contains(const String &x) const {
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return strstr(c_str(), x.c_str()) != NULL;
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}
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bool String::contains(const char *x) const {
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assert(x != 0);
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return strstr(c_str(), x) != NULL;
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}
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bool String::contains(char x) const {
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return strchr(c_str(), x) != NULL;
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}
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bool String::matchString(const char *pat, bool ignoreCase, bool pathMode) const {
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return Common::matchString(c_str(), pat, ignoreCase, pathMode);
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}
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bool String::matchString(const String &pat, bool ignoreCase, bool pathMode) const {
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return Common::matchString(c_str(), pat.c_str(), ignoreCase, pathMode);
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}
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void String::deleteLastChar() {
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if (_size > 0)
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deleteChar(_size - 1);
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}
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void String::deleteChar(uint32 p) {
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assert(p < _size);
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makeUnique();
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while (p++ < _size)
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_str[p - 1] = _str[p];
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_size--;
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}
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void String::clear() {
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decRefCount(_extern._refCount);
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_size = 0;
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_str = _storage;
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_storage[0] = 0;
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}
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void String::setChar(char c, uint32 p) {
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assert(p <= _size);
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makeUnique();
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_str[p] = c;
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}
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void String::insertChar(char c, uint32 p) {
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assert(p <= _size);
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ensureCapacity(_size + 1, true);
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_size++;
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for (uint32 i = _size; i > p; --i)
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_str[i] = _str[i - 1];
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_str[p] = c;
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}
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void String::toLowercase() {
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makeUnique();
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for (uint32 i = 0; i < _size; ++i)
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_str[i] = tolower(_str[i]);
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}
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void String::toUppercase() {
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makeUnique();
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for (uint32 i = 0; i < _size; ++i)
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_str[i] = toupper(_str[i]);
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}
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void String::trim() {
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if (_size == 0)
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return;
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makeUnique();
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// Trim trailing whitespace
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while (_size >= 1 && isspace(_str[_size - 1]))
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--_size;
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_str[_size] = 0;
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// Trim leading whitespace
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char *t = _str;
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while (isspace(*t))
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t++;
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if (t != _str) {
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_size -= t - _str;
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memmove(_str, t, _size + 1);
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}
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}
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uint String::hash() const {
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return hashit(c_str());
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}
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// static
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String String::printf(const char *fmt, ...) {
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String output;
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assert(output.isStorageIntern());
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va_list va;
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va_start(va, fmt);
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int len = vsnprintf(output._str, _builtinCapacity, fmt, va);
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va_end(va);
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if (len == -1) {
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// MSVC doesn't return the size the full string would take up.
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// Try increasing the size of the string until it fits.
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// We assume MSVC failed to output the correct, null-terminated string
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// if the return value is either -1 or size.
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int size = _builtinCapacity;
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do {
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size *= 2;
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output.ensureCapacity(size - 1, false);
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assert(!output.isStorageIntern());
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size = output._extern._capacity;
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va_start(va, fmt);
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len = vsnprintf(output._str, size, fmt, va);
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va_end(va);
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} while (len == -1 || len >= size);
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output._size = len;
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} else if (len < (int)_builtinCapacity) {
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// vsnprintf succeeded
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output._size = len;
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} else {
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// vsnprintf didn't have enough space, so grow buffer
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output.ensureCapacity(len, false);
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va_start(va, fmt);
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int len2 = vsnprintf(output._str, len+1, fmt, va);
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va_end(va);
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assert(len == len2);
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output._size = len2;
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}
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return output;
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}
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#pragma mark -
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bool String::operator==(const String &x) const {
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return equals(x);
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}
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bool String::operator==(const char *x) const {
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assert(x != 0);
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return equals(x);
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}
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bool String::operator!=(const String &x) const {
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return !equals(x);
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}
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bool String::operator !=(const char *x) const {
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assert(x != 0);
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return !equals(x);
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}
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bool String::operator<(const String &x) const {
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return compareTo(x) < 0;
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}
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bool String::operator<=(const String &x) const {
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return compareTo(x) <= 0;
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}
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bool String::operator>(const String &x) const {
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return compareTo(x) > 0;
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}
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bool String::operator>=(const String &x) const {
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return compareTo(x) >= 0;
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}
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|
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#pragma mark -
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bool operator==(const char* y, const String &x) {
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return (x == y);
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}
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bool operator!=(const char* y, const String &x) {
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return x != y;
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}
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#pragma mark -
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bool String::equals(const String &x) const {
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return (0 == compareTo(x));
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}
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bool String::equals(const char *x) const {
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assert(x != 0);
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return (0 == compareTo(x));
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}
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bool String::equalsIgnoreCase(const String &x) const {
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return (0 == compareToIgnoreCase(x));
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}
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bool String::equalsIgnoreCase(const char *x) const {
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assert(x != 0);
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return (0 == compareToIgnoreCase(x));
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}
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int String::compareTo(const String &x) const {
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return compareTo(x.c_str());
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}
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int String::compareTo(const char *x) const {
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assert(x != 0);
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return strcmp(c_str(), x);
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}
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int String::compareToIgnoreCase(const String &x) const {
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return compareToIgnoreCase(x.c_str());
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}
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int String::compareToIgnoreCase(const char *x) const {
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assert(x != 0);
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return scumm_stricmp(c_str(), x);
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}
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#pragma mark -
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String operator+(const String &x, const String &y) {
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String temp(x);
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temp += y;
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return temp;
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}
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String operator+(const char *x, const String &y) {
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String temp(x);
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temp += y;
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return temp;
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}
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String operator+(const String &x, const char *y) {
|
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String temp(x);
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temp += y;
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return temp;
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}
|
|
|
|
String operator+(char x, const String &y) {
|
|
String temp(x);
|
|
temp += y;
|
|
return temp;
|
|
}
|
|
|
|
String operator+(const String &x, char y) {
|
|
String temp(x);
|
|
temp += y;
|
|
return temp;
|
|
}
|
|
|
|
char *ltrim(char *t) {
|
|
while (isspace(*t))
|
|
t++;
|
|
return t;
|
|
}
|
|
|
|
char *rtrim(char *t) {
|
|
int l = strlen(t) - 1;
|
|
while (l >= 0 && isspace(t[l]))
|
|
t[l--] = 0;
|
|
return t;
|
|
}
|
|
|
|
char *trim(char *t) {
|
|
return rtrim(ltrim(t));
|
|
}
|
|
|
|
Common::String lastPathComponent(const Common::String &path, const char sep) {
|
|
const char *str = path.c_str();
|
|
const char *last = str + path.size();
|
|
|
|
// Skip over trailing slashes
|
|
while (last > str && *(last-1) == sep)
|
|
--last;
|
|
|
|
// Path consisted of only slashes -> return empty string
|
|
if (last == str)
|
|
return Common::String();
|
|
|
|
// Now scan the whole component
|
|
const char *first = last - 1;
|
|
while (first >= str && *first != sep)
|
|
--first;
|
|
|
|
if (*first == sep)
|
|
first++;
|
|
|
|
return Common::String(first, last);
|
|
}
|
|
|
|
Common::String normalizePath(const Common::String &path, const char sep) {
|
|
if (path.empty())
|
|
return path;
|
|
|
|
const char *cur = path.c_str();
|
|
Common::String result;
|
|
|
|
// If there is a leading slash, preserve that:
|
|
if (*cur == sep) {
|
|
result += sep;
|
|
while (*cur == sep)
|
|
++cur;
|
|
}
|
|
|
|
// Scan till the end of the String
|
|
while (*cur != 0) {
|
|
const char *start = cur;
|
|
|
|
// Scan till the next path separator resp. the end of the string
|
|
while (*cur != sep && *cur != 0)
|
|
cur++;
|
|
|
|
const Common::String component(start, cur);
|
|
|
|
// Skip empty components and dot components, add all others
|
|
if (!component.empty() && component != ".") {
|
|
// Add a separator before the component, unless the result
|
|
// string already ends with one (which happens only if the
|
|
// path *starts* with a separator).
|
|
if (!result.empty() && result.lastChar() != sep)
|
|
result += sep;
|
|
|
|
// Add the component
|
|
result += component;
|
|
}
|
|
|
|
// Skip over separator chars
|
|
while (*cur == sep)
|
|
cur++;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
bool matchString(const char *str, const char *pat, bool ignoreCase, bool pathMode) {
|
|
assert(str);
|
|
assert(pat);
|
|
|
|
const char *p = 0;
|
|
const char *q = 0;
|
|
|
|
for (;;) {
|
|
if (pathMode && *str == '/') {
|
|
p = 0;
|
|
q = 0;
|
|
if (*pat == '?')
|
|
return false;
|
|
}
|
|
|
|
switch (*pat) {
|
|
case '*':
|
|
// Record pattern / string position for backtracking
|
|
p = ++pat;
|
|
q = str;
|
|
// If pattern ended with * -> match
|
|
if (!*pat)
|
|
return true;
|
|
break;
|
|
|
|
default:
|
|
if ((!ignoreCase && *pat != *str) ||
|
|
(ignoreCase && tolower(*pat) != tolower(*str))) {
|
|
if (p) {
|
|
// No match, oops -> try to backtrack
|
|
pat = p;
|
|
str = ++q;
|
|
if (!*str)
|
|
return !*pat;
|
|
break;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
// fallthrough
|
|
case '?':
|
|
if (!*str)
|
|
return !*pat;
|
|
pat++;
|
|
str++;
|
|
}
|
|
}
|
|
}
|
|
|
|
String tag2string(uint32 tag) {
|
|
char str[5];
|
|
str[0] = (char)(tag >> 24);
|
|
str[1] = (char)(tag >> 16);
|
|
str[2] = (char)(tag >> 8);
|
|
str[3] = (char)tag;
|
|
str[4] = '\0';
|
|
// Replace non-printable chars by dot
|
|
for (int i = 0; i < 4; ++i) {
|
|
if (!isprint((unsigned char)str[i]))
|
|
str[i] = '.';
|
|
}
|
|
return Common::String(str);
|
|
}
|
|
|
|
size_t strlcpy(char *dst, const char *src, size_t size) {
|
|
// Our backup of the source's start, we need this
|
|
// to calculate the source's length.
|
|
const char * const srcStart = src;
|
|
|
|
// In case a non-empty size was specified we
|
|
// copy over (size - 1) bytes at max.
|
|
if (size != 0) {
|
|
// Copy over (size - 1) bytes at max.
|
|
while (--size != 0) {
|
|
if ((*dst++ = *src) == 0)
|
|
break;
|
|
++src;
|
|
}
|
|
|
|
// In case the source string was longer than the
|
|
// destination, we need to add a terminating
|
|
// zero.
|
|
if (size == 0)
|
|
*dst = 0;
|
|
}
|
|
|
|
// Move to the terminating zero of the source
|
|
// string, we need this to determin the length
|
|
// of the source string.
|
|
while (*src)
|
|
++src;
|
|
|
|
// Return the source string's length.
|
|
return src - srcStart;
|
|
}
|
|
|
|
size_t strlcat(char *dst, const char *src, size_t size) {
|
|
// In case the destination buffer does not contain
|
|
// space for at least 1 character, we will just
|
|
// return the source string's length.
|
|
if (size == 0)
|
|
return strlen(src);
|
|
|
|
// Our backup of the source's start, we need this
|
|
// to calculate the source's length.
|
|
const char * const srcStart = src;
|
|
|
|
// Our backup of the destination's start, we need
|
|
// this to calculate the destination's length.
|
|
const char * const dstStart = dst;
|
|
|
|
// Search the end of the destination, but do not
|
|
// move past the terminating zero.
|
|
while (size-- != 0 && *dst != 0)
|
|
++dst;
|
|
|
|
// Calculate the destination's length;
|
|
const size_t dstLength = dst - dstStart;
|
|
|
|
// In case we reached the end of the destination
|
|
// buffer before we had a chance to append any
|
|
// characters we will just return the destination
|
|
// length plus the source string's length.
|
|
if (size == 0)
|
|
return dstLength + strlen(srcStart);
|
|
|
|
// Copy over all of the source that fits
|
|
// the destination buffer. We also need
|
|
// to take the terminating zero we will
|
|
// add into consideration.
|
|
while (size-- != 0 && *src != 0)
|
|
*dst++ = *src++;
|
|
*dst = 0;
|
|
|
|
// Move to the terminating zero of the source
|
|
// string, we need this to determin the length
|
|
// of the source string.
|
|
while (*src)
|
|
++src;
|
|
|
|
// Return the total length of the result string
|
|
return dstLength + (src - srcStart);
|
|
}
|
|
|
|
} // End of namespace Common
|