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646 lines
14 KiB
C++
646 lines
14 KiB
C++
/*
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WString.cpp - String library for Wiring & Arduino
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...mostly rewritten by Paul Stoffregen...
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Copyright (c) 2009-10 Hernando Barragan. All rights reserved.
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Copyright 2011, Paul Stoffregen, paul@pjrc.com
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "WString.h"
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/*********************************************/
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/* Constructors */
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/*********************************************/
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String::String(const char *cstr)
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{
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init();
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if (cstr) copy(cstr, strlen(cstr));
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}
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String::String(const String &value)
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{
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init();
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*this = value;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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String::String(String &&rval)
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{
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init();
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move(rval);
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}
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String::String(StringSumHelper &&rval)
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{
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init();
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move(rval);
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}
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#endif
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String::String(char c)
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{
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init();
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char buf[2];
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buf[0] = c;
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buf[1] = 0;
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*this = buf;
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}
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String::String(unsigned char value, unsigned char base)
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{
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init();
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char buf[9];
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utoa(value, buf, base);
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*this = buf;
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}
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String::String(int value, unsigned char base)
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{
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init();
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char buf[18];
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itoa(value, buf, base);
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*this = buf;
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}
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String::String(unsigned int value, unsigned char base)
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{
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init();
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char buf[17];
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utoa(value, buf, base);
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*this = buf;
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}
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String::String(long value, unsigned char base)
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{
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init();
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char buf[34];
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ltoa(value, buf, base);
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*this = buf;
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}
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String::String(unsigned long value, unsigned char base)
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{
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init();
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char buf[33];
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ultoa(value, buf, base);
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*this = buf;
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}
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String::~String()
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{
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free(buffer);
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}
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/*********************************************/
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/* Memory Management */
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/*********************************************/
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inline void String::init(void)
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{
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buffer = NULL;
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capacity = 0;
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len = 0;
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flags = 0;
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}
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void String::invalidate(void)
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{
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if (buffer) free(buffer);
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buffer = NULL;
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capacity = len = 0;
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}
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unsigned char String::reserve(unsigned int size)
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{
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if (buffer && capacity >= size) return 1;
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if (changeBuffer(size)) {
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if (len == 0) buffer[0] = 0;
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return 1;
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}
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return 0;
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}
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unsigned char String::changeBuffer(unsigned int maxStrLen)
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{
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char *newbuffer = (char *)realloc(buffer, maxStrLen + 1);
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if (newbuffer) {
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buffer = newbuffer;
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capacity = maxStrLen;
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return 1;
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}
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return 0;
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}
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/*********************************************/
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/* Copy and Move */
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/*********************************************/
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String & String::copy(const char *cstr, unsigned int length)
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{
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if (!reserve(length)) {
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invalidate();
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return *this;
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}
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len = length;
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strcpy(buffer, cstr);
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return *this;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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void String::move(String &rhs)
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{
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if (buffer) {
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if (capacity >= rhs.len) {
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strcpy(buffer, rhs.buffer);
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len = rhs.len;
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rhs.len = 0;
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return;
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} else {
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free(buffer);
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}
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}
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buffer = rhs.buffer;
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capacity = rhs.capacity;
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len = rhs.len;
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rhs.buffer = NULL;
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rhs.capacity = 0;
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rhs.len = 0;
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}
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#endif
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String & String::operator = (const String &rhs)
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{
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if (this == &rhs) return *this;
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if (rhs.buffer) copy(rhs.buffer, rhs.len);
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else invalidate();
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return *this;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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String & String::operator = (String &&rval)
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{
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if (this != &rval) move(rval);
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return *this;
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}
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String & String::operator = (StringSumHelper &&rval)
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{
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if (this != &rval) move(rval);
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return *this;
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}
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#endif
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String & String::operator = (const char *cstr)
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{
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if (cstr) copy(cstr, strlen(cstr));
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else invalidate();
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return *this;
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}
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/*********************************************/
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/* concat */
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/*********************************************/
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unsigned char String::concat(const String &s)
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{
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return concat(s.buffer, s.len);
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}
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unsigned char String::concat(const char *cstr, unsigned int length)
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{
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unsigned int newlen = len + length;
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if (!cstr) return 0;
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if (length == 0) return 1;
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if (!reserve(newlen)) return 0;
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strcpy(buffer + len, cstr);
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len = newlen;
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return 1;
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}
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unsigned char String::concat(const char *cstr)
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{
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if (!cstr) return 0;
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return concat(cstr, strlen(cstr));
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}
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unsigned char String::concat(char c)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = 0;
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return concat(buf, 1);
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}
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unsigned char String::concat(unsigned char num)
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{
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char buf[4];
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itoa(num, buf, 10);
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return concat(buf, strlen(buf));
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}
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unsigned char String::concat(int num)
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{
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char buf[7];
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itoa(num, buf, 10);
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return concat(buf, strlen(buf));
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}
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unsigned char String::concat(unsigned int num)
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{
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char buf[6];
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utoa(num, buf, 10);
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return concat(buf, strlen(buf));
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}
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unsigned char String::concat(long num)
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{
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char buf[12];
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ltoa(num, buf, 10);
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return concat(buf, strlen(buf));
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}
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unsigned char String::concat(unsigned long num)
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{
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char buf[11];
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ultoa(num, buf, 10);
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return concat(buf, strlen(buf));
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}
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/*********************************************/
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/* Concatenate */
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/*********************************************/
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StringSumHelper & operator + (const StringSumHelper &lhs, const String &rhs)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(rhs.buffer, rhs.len)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, const char *cstr)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!cstr || !a.concat(cstr, strlen(cstr))) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, char c)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(c)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, unsigned char num)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(num)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, int num)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(num)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, unsigned int num)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(num)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, long num)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(num)) a.invalidate();
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return a;
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}
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StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num)
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{
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StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
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if (!a.concat(num)) a.invalidate();
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return a;
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}
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/*********************************************/
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/* Comparison */
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/*********************************************/
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int String::compareTo(const String &s) const
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{
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if (!buffer || !s.buffer) {
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if (s.buffer && s.len > 0) return 0 - *(unsigned char *)s.buffer;
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if (buffer && len > 0) return *(unsigned char *)buffer;
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return 0;
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}
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return strcmp(buffer, s.buffer);
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}
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unsigned char String::equals(const String &s2) const
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{
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return (len == s2.len && compareTo(s2) == 0);
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}
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unsigned char String::equals(const char *cstr) const
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{
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if (len == 0) return (cstr == NULL || *cstr == 0);
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if (cstr == NULL) return buffer[0] == 0;
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return strcmp(buffer, cstr) == 0;
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}
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unsigned char String::operator<(const String &rhs) const
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{
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return compareTo(rhs) < 0;
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}
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unsigned char String::operator>(const String &rhs) const
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{
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return compareTo(rhs) > 0;
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}
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unsigned char String::operator<=(const String &rhs) const
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{
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return compareTo(rhs) <= 0;
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}
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unsigned char String::operator>=(const String &rhs) const
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{
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return compareTo(rhs) >= 0;
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}
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unsigned char String::equalsIgnoreCase( const String &s2 ) const
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{
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if (this == &s2) return 1;
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if (len != s2.len) return 0;
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if (len == 0) return 1;
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const char *p1 = buffer;
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const char *p2 = s2.buffer;
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while (*p1) {
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if (tolower(*p1++) != tolower(*p2++)) return 0;
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}
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return 1;
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}
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unsigned char String::startsWith( const String &s2 ) const
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{
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if (len < s2.len) return 0;
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return startsWith(s2, 0);
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}
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unsigned char String::startsWith( const String &s2, unsigned int offset ) const
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{
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if (offset > len - s2.len || !buffer || !s2.buffer) return 0;
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return strncmp( &buffer[offset], s2.buffer, s2.len ) == 0;
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}
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unsigned char String::endsWith( const String &s2 ) const
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{
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if ( len < s2.len || !buffer || !s2.buffer) return 0;
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return strcmp(&buffer[len - s2.len], s2.buffer) == 0;
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}
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/*********************************************/
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/* Character Access */
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/*********************************************/
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char String::charAt(unsigned int loc) const
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{
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return operator[](loc);
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}
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void String::setCharAt(unsigned int loc, char c)
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{
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if (loc < len) buffer[loc] = c;
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}
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char & String::operator[](unsigned int index)
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{
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static char dummy_writable_char;
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if (index >= len || !buffer) {
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dummy_writable_char = 0;
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return dummy_writable_char;
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}
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return buffer[index];
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}
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char String::operator[]( unsigned int index ) const
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{
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if (index >= len || !buffer) return 0;
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return buffer[index];
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}
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void String::getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index) const
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{
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if (!bufsize || !buf) return;
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if (index >= len) {
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buf[0] = 0;
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return;
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}
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unsigned int n = bufsize - 1;
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if (n > len - index) n = len - index;
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strncpy((char *)buf, buffer + index, n);
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buf[n] = 0;
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}
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/*********************************************/
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/* Search */
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/*********************************************/
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int String::indexOf(char c) const
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{
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return indexOf(c, 0);
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}
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int String::indexOf( char ch, unsigned int fromIndex ) const
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{
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if (fromIndex >= len) return -1;
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const char* temp = strchr(buffer + fromIndex, ch);
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if (temp == NULL) return -1;
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return temp - buffer;
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}
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int String::indexOf(const String &s2) const
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{
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return indexOf(s2, 0);
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}
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int String::indexOf(const String &s2, unsigned int fromIndex) const
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{
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if (fromIndex >= len) return -1;
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const char *found = strstr(buffer + fromIndex, s2.buffer);
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if (found == NULL) return -1;
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return found - buffer;
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}
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int String::lastIndexOf( char theChar ) const
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{
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return lastIndexOf(theChar, len - 1);
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}
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int String::lastIndexOf(char ch, int fromIndex) const
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{
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if (fromIndex >= len || fromIndex < 0) return -1;
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char tempchar = buffer[fromIndex + 1];
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buffer[fromIndex + 1] = '\0';
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char* temp = strrchr( buffer, ch );
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buffer[fromIndex + 1] = tempchar;
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if (temp == NULL) return -1;
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return temp - buffer;
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}
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int String::lastIndexOf(const String &s2) const
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{
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return lastIndexOf(s2, len - s2.len);
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}
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int String::lastIndexOf(const String &s2, int fromIndex) const
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{
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if (s2.len == 0 || len == 0 || s2.len > len || fromIndex < 0) return -1;
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if (fromIndex >= len) fromIndex = len - 1;
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int found = -1;
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for (char *p = buffer; p <= buffer + fromIndex; p++) {
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p = strstr(p, s2.buffer);
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if (!p) break;
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if (p - buffer <= fromIndex) found = p - buffer;
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}
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return found;
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}
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String String::substring( unsigned int left ) const
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{
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return substring(left, len);
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}
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String String::substring(unsigned int left, unsigned int right) const
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{
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if (left > right) {
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unsigned int temp = right;
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right = left;
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left = temp;
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}
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String out;
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if (left > len) return out;
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if (right > len) right = len;
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char temp = buffer[right]; // save the replaced character
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buffer[right] = '\0';
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out = buffer + left; // pointer arithmetic
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buffer[right] = temp; //restore character
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return out;
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}
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/*********************************************/
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/* Modification */
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/*********************************************/
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void String::replace(char find, char replace)
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{
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if (!buffer) return;
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for (char *p = buffer; *p; p++) {
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if (*p == find) *p = replace;
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}
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}
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void String::replace(const String& find, const String& replace)
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{
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if (len == 0 || find.len == 0) return;
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int diff = replace.len - find.len;
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char *readFrom = buffer;
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char *foundAt;
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if (diff == 0) {
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while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
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memcpy(foundAt, replace.buffer, replace.len);
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readFrom = foundAt + replace.len;
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}
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} else if (diff < 0) {
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char *writeTo = buffer;
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while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
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unsigned int n = foundAt - readFrom;
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memcpy(writeTo, readFrom, n);
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writeTo += n;
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memcpy(writeTo, replace.buffer, replace.len);
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writeTo += replace.len;
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readFrom = foundAt + find.len;
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len += diff;
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}
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strcpy(writeTo, readFrom);
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} else {
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unsigned int size = len; // compute size needed for result
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while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
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|
readFrom = foundAt + find.len;
|
|
size += diff;
|
|
}
|
|
if (size == len) return;
|
|
if (size > capacity && !changeBuffer(size)) return; // XXX: tell user!
|
|
int index = len - 1;
|
|
while ((index = lastIndexOf(find, index)) >= 0) {
|
|
readFrom = buffer + index + find.len;
|
|
memmove(readFrom + diff, readFrom, len - (readFrom - buffer));
|
|
len += diff;
|
|
buffer[len] = 0;
|
|
memcpy(buffer + index, replace.buffer, replace.len);
|
|
index--;
|
|
}
|
|
}
|
|
}
|
|
|
|
void String::toLowerCase(void)
|
|
{
|
|
if (!buffer) return;
|
|
for (char *p = buffer; *p; p++) {
|
|
*p = tolower(*p);
|
|
}
|
|
}
|
|
|
|
void String::toUpperCase(void)
|
|
{
|
|
if (!buffer) return;
|
|
for (char *p = buffer; *p; p++) {
|
|
*p = toupper(*p);
|
|
}
|
|
}
|
|
|
|
void String::trim(void)
|
|
{
|
|
if (!buffer || len == 0) return;
|
|
char *begin = buffer;
|
|
while (isspace(*begin)) begin++;
|
|
char *end = buffer + len - 1;
|
|
while (isspace(*end) && end >= begin) end--;
|
|
len = end + 1 - begin;
|
|
if (begin > buffer) memcpy(buffer, begin, len);
|
|
buffer[len] = 0;
|
|
}
|
|
|
|
/*********************************************/
|
|
/* Parsing / Conversion */
|
|
/*********************************************/
|
|
|
|
long String::toInt(void) const
|
|
{
|
|
if (buffer) return atol(buffer);
|
|
return 0;
|
|
}
|
|
|
|
|