// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_sprintf
#define tools_sprintf

#include <string>
#include "snpf"

namespace tools {

inline bool vsprintf(std::string& a_string,int a_length,const char* a_format,va_list a_args){
  a_string.clear();
  if(a_length<0) return false;
  if(!a_format) return false;
  char* _s = new char[a_length+1];
  if(!_s) return false;
  _s[a_length] = '\0';
  int n = vsnpf(_s,a_length+1,a_format,a_args);
  if(n>a_length) {
    delete [] _s;
    return false;
  }
  if(_s[a_length]!='\0') {
    delete [] _s;
    return false;
  }
  a_string = _s;
  delete [] _s;
  return true;
}


inline bool sprintf(std::string& a_string,int a_length,const char* a_format,...){
  a_string.clear();
  if(a_length<0) return false;
  if(!a_format) return false;
  char* _s = new char[a_length+1];
  if(!_s) return false;
  _s[a_length] = '\0';
  va_list args;
  va_start(args,a_format);
  int n = vsnpf(_s,a_length+1,a_format,args);
  va_end(args);
  if(n>a_length) {
    delete [] _s;
    return false;
  }
  if(_s[a_length]!='\0') {
    delete [] _s;
    return false;
  }
  a_string = _s;
  delete [] _s;
  return true;
}

inline bool print2s(std::string& a_string,int a_length,const char* a_format,...){
  if(a_length<0) {a_string.clear();return false;}
  if(!a_format) {a_string.clear();return false;}
  a_string.assign(a_length,' '); //data = a_length+1
  char* _s = const_cast<char*>(a_string.c_str());
  //_s[a_length] shoulg be '\0'.
  va_list args;
  va_start(args,a_format);
  int n = vsnpf(_s,a_length+1,a_format,args);
  va_end(args);
  if(n>a_length) { //a_string is compromised.
    a_string.clear(); //we cross fingers.
    return false;
  }
  if(_s[a_length]!='\0') { //a_string is compromised.
    a_string.clear(); //we cross fingers.
    return false;
  }
  a_string.resize(n);
  return true;
}

}

#endif
