00001 /******************************************************************************* 00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved. 00003 * Copyright (C) 2005 Novell, Inc. All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * 00008 * - Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * 00011 * - Redistributions in binary form must reproduce the above copyright notice, 00012 * this list of conditions and the following disclaimer in the documentation 00013 * and/or other materials provided with the distribution. 00014 * 00015 * - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its 00016 * contributors may be used to endorse or promote products derived from this 00017 * software without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc., Novell, Inc., OR THE 00023 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00024 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00025 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00026 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00027 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00028 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00029 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 *******************************************************************************/ 00031 00032 00037 #ifndef BLOCXX_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_ 00038 #define BLOCXX_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_ 00039 #include "blocxx/BLOCXX_config.h" 00040 #if defined(BLOCXX_HAVE_ISTREAM) 00041 #include <istream> 00042 #else 00043 #include <iostream> 00044 #endif 00045 00046 00047 namespace BLOCXX_NAMESPACE 00048 { 00049 00055 class IstreamBufIterator 00056 { 00057 public: 00058 class proxy 00059 { 00060 friend class IstreamBufIterator; 00061 public: 00062 char operator*() { return m_keep; } 00063 private: 00064 proxy(char c) : m_keep(c) {} 00065 char m_keep; 00066 }; 00067 IstreamBufIterator() : m_sbuf(0) {} 00068 IstreamBufIterator(std::istream& s) : m_sbuf(s.rdbuf()) {} 00069 IstreamBufIterator(std::streambuf* b) : m_sbuf(b) {} 00070 char operator*() const 00071 { 00072 if (m_sbuf) 00073 { 00074 return (m_sbuf->sgetc()); 00075 } 00076 else 00077 { 00078 return 0; 00079 } 00080 } 00081 IstreamBufIterator& operator++() 00082 { 00083 m_sbuf->sbumpc(); 00084 if (m_sbuf->sgetc() == EOF) 00085 { 00086 m_sbuf = 0; 00087 } 00088 return *this; 00089 } 00090 proxy operator++(int) 00091 { 00092 proxy temp(m_sbuf->sgetc()); 00093 m_sbuf->sbumpc(); 00094 if (m_sbuf->sgetc() == EOF) 00095 { 00096 m_sbuf = 0; 00097 } 00098 return temp; 00099 } 00100 00101 bool equal(const IstreamBufIterator& b) const 00102 { 00103 return (m_sbuf == 0) ^ (b.m_sbuf != 0); // do a little manual strength reduction 00104 // if (((m_sbuf == 0) && (b.m_sbuf == 0)) || ((m_sbuf != 0) && (b.m_sbuf != 0))) 00105 // { 00106 // return true; 00107 // } 00108 // else 00109 // { 00110 // return false; 00111 // } 00112 } 00113 private: 00114 std::streambuf* m_sbuf; 00115 }; 00116 inline bool operator==(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs) 00117 { 00118 return lhs.equal(rhs); 00119 } 00120 inline bool operator!=(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs) 00121 { 00122 return !lhs.equal(rhs); 00123 } 00124 00125 } // end namespace BLOCXX_NAMESPACE 00126 00127 #endif