sprintf

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// 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 print2sv(std::string& a_string,int a_length,const char* a_format,va_list a_args){
  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'.
  int n = vsnpf(s,a_length+1,a_format,a_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;
}
 
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;
}
 
template <class MATRIX> //for example : MATRIX = mat<symbol,4>
inline void set_matrix(MATRIX& a_matrix,const std::string& a_fmt) {
  unsigned int DR = a_matrix.rows();
  unsigned int DC = a_matrix.cols();
  std::string ss;
  for(unsigned int i=0;i<DR;i++) {
    for(unsigned int j=0;j<DC;j++) {
      tools::sprintf(ss,128,a_fmt.c_str(),i,j);
      a_matrix.set_value(i,j,ss);
    }
  }
}
 
}
 
#endif