StringFile.hh

 
#ifndef GRAMODS_CORE_STRINGFILE
#define GRAMODS_CORE_STRINGFILE
 
#include <gmCore/config.hh>
#include <gmCore/PreConditionViolation.hh>
 
#include <optional>
 
#include <stdio.h>
#include <string.h>
 
BEGIN_NAMESPACE_GMCORE
 
struct StringFile {
 
  ~StringFile() {
    if (file_ptr) fclose(*file_ptr);
  }
 
  FILE * getFilePtr() {
    if (!file_ptr) file_ptr = tmpfile();
    return *file_ptr;
  }
 
  std::string finalize() {
    if (!file_ptr) throw PreConditionViolation("Cannot finalize - not open");
 
    rewind(*file_ptr);
 
    char buffer [256];
    std::stringstream ss;
 
    while (!feof(*file_ptr)) {
      if (fgets(buffer, 256, *file_ptr) == NULL) break;
      ss << buffer;
    }
 
    fclose(*file_ptr);
    file_ptr = std::nullopt;
 
    return ss.str();
  }
 
private:
  std::optional<FILE*> file_ptr;
};
 
END_NAMESPACE_GMCORE
 
#endif