rcmp

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_rcmp
#define tools_rcmp
 
// used in safe cast.
 
#include <string>
#include <cstring>
 
namespace tools {
 
inline bool rcmp(const char* a_1,const char* a_2) {
  size_t l1 = ::strlen(a_1);
  size_t l2 = ::strlen(a_2);
  if(l1!=l2) return false;
  if(!l1) return true;
  const char* p1 = a_1+l1-1;
  const char* p2 = a_2+l2-1;
  //ab
  //012
  for(size_t index=0;index<l1;index++,p1--,p2--) {
    if(*p1!=*p2) return false;
  }
  return true;
}
 
inline bool rcmp(const std::string& a_1,const char* a_2) {
  std::string::size_type l1 = a_1.size();
  size_t l2 = ::strlen(a_2);
  if(size_t(l1)!=l2) return false;
  if(!l1) return true;
  const char* p1 = a_1.c_str()+l1-1;
  const char* p2 = a_2+l2-1;
  //ab
  //012
  for(std::string::size_type index=0;index<l1;index++,p1--,p2--) {
    if(*p1!=*p2) return false;
  }
  return true;
}
 
inline bool rcmp(const char* a_1,const std::string& a_2) {
  size_t l1 = ::strlen(a_1);
  std::string::size_type l2 = a_2.size();
  if(l1!=size_t(l2)) return false;
  if(!l1) return true;
  const char* p1 = a_1+l1-1;
  const char* p2 = a_2.c_str()+l2-1;
  //ab
  //012
  for(size_t index=0;index<l1;index++,p1--,p2--) {
    if(*p1!=*p2) return false;
  }
  return true;
}
 
inline bool rcmp(const std::string& a_1,const std::string& a_2) {
  std::string::size_type l1 = a_1.size();
  std::string::size_type l2 = a_2.size();
  if(l1!=l2) return false;
  if(!l1) return true;
  const char* p1 = a_1.c_str()+l1-1;
  const char* p2 = a_2.c_str()+l2-1;
  //ab
  //012
  for(std::string::size_type index=0;index<l1;index++,p1--,p2--) {
    if(*p1!=*p2) return false;
  }
  return true;
}
 
}
 
#endif