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Diffstat (limited to 'common/str.cpp')
| -rw-r--r-- | common/str.cpp | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/common/str.cpp b/common/str.cpp new file mode 100644 index 0000000000..2594489371 --- /dev/null +++ b/common/str.cpp @@ -0,0 +1,235 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2002 The ScummVM project + * + * 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 2 + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + */ + +#include "stdafx.h" +#include "str.h" + + +namespace ScummVM { + +String::String(const char *str) +{ + _refCount = new int(1); + if (str) { + _capacity = _len = strlen(str); + _str = (char *)calloc(1, _capacity+1); + memcpy(_str, str, _len+1); + } else { + _capacity = _len = 0; + _str = 0; + } +} + +String::String(const String &str) +{ + ++(*str._refCount); + + _refCount = str._refCount; + _capacity = str._capacity; + _len = str._capacity; + _str = str._str; +} + +String::~String() +{ + decRefCount(); +} + +void String::decRefCount() +{ + --(*_refCount); + if (*_refCount <= 0) { + delete _refCount; + if (_str) + free(_str); + } +} + +String& String::operator =(const char* str) +{ + int len = strlen(str); + if (len > 0) { + ensureCapacity(len, false); + + _len = len; + memcpy(_str, str, _len + 1); + } else if (_len > 0) { + decRefCount(); + + _refCount = new int(1); + _capacity = 0; + _len = 0; + _str = 0; + } + return *this; +} + +String& String::operator =(const String& str) +{ + ++(*str._refCount); + + decRefCount(); + + _refCount = str._refCount; + _capacity = str._capacity; + _len = str._len; + _str = str._str; + + return *this; +} + +String& String::operator +=(const char* str) +{ + int len = strlen(str); + if (len > 0) { + ensureCapacity(_len + len, true); + + memcpy(_str + _len, str, len + 1); + _len += len; + } + return *this; +} + +String& String::operator +=(const String& str) +{ + int len = str._len; + if (len > 0) { + ensureCapacity(_len + len, true); + + memcpy(_str + _len, str._str, len + 1); + _len += len; + } + return *this; +} + +String& String::operator +=(char c) +{ + ensureCapacity(_len + 1, true); + + _str[_len++] = c; + _str[_len] = 0; + + return *this; +} + +bool String::operator ==(const String& x) const +{ + return (_len == x._len) && ((_len == 0) || (0 == strcmp(_str, x._str))); +} + +bool String::operator ==(const char* x) const +{ + if (_str == 0) + return (x == 0) || (*x == 0); + if (x == 0) + return (_len == 0); + return (0 != strcmp(_str, x)); +} + +bool String::operator !=(const String& x) const +{ + return (_len != x._len) || ((_len != 0) && (0 != strcmp(_str, x._str))); +} + +bool String::operator !=(const char* x) const +{ + if (_str == 0) + return (x != 0) && (*x != 0); + if (x == 0) + return (_len != 0); + return (0 == strcmp(_str, x)); +} + +bool String::operator < (const String& x) const +{ + if (!_len || !x._len) // Any or both particpants are empty? + return !_len && x._len; // Less only if this string is empty and the other isn't + return strcmp(_str, x._str) < 0; +} + +bool String::operator <= (const String& x) const +{ + if (!_len || !x._len) // Any or both particpants are empty? + return !_len; // Less or equal unless the other string is empty and this one isn't + return strcmp(_str, x._str) <= 0; +} + +bool String::operator > (const String& x) const +{ + return (x < *this); +} + +bool String::operator >= (const String& x) const +{ + return (x <= *this); +} + +void String::deleteLastChar() { + if (_len > 0) { + ensureCapacity(_len - 1, true); + _str[--_len] = 0; + } +} + +void String::clear() +{ + if (_capacity) { + decRefCount(); + + _refCount = new int(1); + _capacity = 0; + _len = 0; + _str = 0; + } +} + +void String::ensureCapacity(int new_len, bool keep_old) +{ + // If there is not enough space, or if we are not the only owner + // of the current data, then we have to reallocate it. + if (new_len <= _capacity && *_refCount == 1) + return; + + int newCapacity = (new_len <= _capacity) ? _capacity : new_len + 32; + char *newStr = (char *)calloc(1, newCapacity+1); + + if (keep_old && _str) + memcpy(newStr, _str, _len + 1); + else + _len = 0; + + decRefCount(); + + _refCount = new int(1); + _capacity = newCapacity; + _str = newStr; +} + +bool operator == (const char* y, const String& x) +{ + return (x == y); +} + +bool operator != (const char* y, const String& x) +{ + return x != y; +} + +}; // End of namespace ScummVM |