sbeg

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_sbeg
#define tools_sbeg
 
#include <string>
 
namespace tools {
 
inline bool is_beg(const std::string& a_s,const std::string& a_b,bool a_forward = true){
  //look if a_s begin with a_b.
  std::string::size_type ls = a_s.size();
  std::string::size_type lb = a_b.size();
  if(lb>ls) return false;
  if(!lb) return false;
  if(a_forward) {
    const char* ps = a_s.c_str();
    const char* pb = a_b.c_str();
    for(std::string::size_type index=0;index<lb;index++,ps++,pb++) {
      if(*ps!=*pb) return false;
    }
  } else {
    const char* ps = a_s.c_str()+lb-1;
    const char* pb = a_b.c_str()+lb-1;
    for(std::string::size_type index=0;index<lb;index++,ps--,pb--) {
      if(*ps!=*pb) return false;
    }
  }
  return true;
}
 
inline bool is_beg(const std::string& a_s,const std::string& a_b,std::string& a_cmd,bool a_forward = true){
  if(!tools::is_beg(a_s,a_b,a_forward)) {a_cmd.clear();return false;}
  if(a_s.size()<(a_b.size()+1)) {a_cmd.clear();return true;}
  // a_s.size() >= a_b.size()+1 :
  a_cmd = a_s.substr(a_b.size()+1,a_s.size()-(a_b.size()+1));
  return true;
}
 
}
 
#endif