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// Copyright (c) 2005-2012 Jay Berkenbilt
//
// This file is part of qpdf. This software may be distributed under
// the terms of version 2 of the Artistic License which may be found
// in the source distribution. It is provided "as is" without express
// or implied warranty.
#ifndef __QUTIL_HH__
#define __QUTIL_HH__
#include <qpdf/DLL.h>
#include <qpdf/Types.h>
#include <string>
#include <list>
#include <stdexcept>
#include <stdio.h>
namespace QUtil
{
// This is a collection of useful utility functions that don't
// really go anywhere else.
QPDF_DLL
std::string int_to_string(long long, int length = 0);
QPDF_DLL
std::string double_to_string(double, int decimal_places = 0);
QPDF_DLL
long long string_to_ll(char const* str);
// Throw std::runtime_error with a string formed by appending to
// "description: " the standard string corresponding to the
// current value of errno.
QPDF_DLL
void throw_system_error(std::string const& description);
// The status argument is assumed to be the return value of a
// standard library call that sets errno when it fails. If status
// is -1, convert the current value of errno to a
// std::runtime_error that includes the standard error string.
// Otherwise, return status.
QPDF_DLL
int os_wrapper(std::string const& description, int status);
// The FILE* argument is assumed to be the return of fopen. If
// null, throw std::runtime_error. Otherwise, return the FILE*
// argument.
QPDF_DLL
FILE* fopen_wrapper(std::string const&, FILE*);
// Wrap around off_t versions of fseek and ftell if available
QPDF_DLL
int seek(FILE* stream, qpdf_offset_t offset, int whence);
QPDF_DLL
qpdf_offset_t tell(FILE* stream);
QPDF_DLL
char* copy_string(std::string const&);
// Set stdin, stdout to binary mode
QPDF_DLL
void binary_stdout();
QPDF_DLL
void binary_stdin();
// Set stdout to line buffered
QPDF_DLL
void setLineBuf(FILE*);
// May modify argv0
QPDF_DLL
char* getWhoami(char* argv0);
// Get the value of an environment variable in a portable fashion.
// Returns true iff the variable is defined. If `value' is
// non-null, initializes it with the value of the variable.
QPDF_DLL
bool get_env(std::string const& var, std::string* value = 0);
QPDF_DLL
time_t get_current_time();
// Return a string containing the byte representation of the UTF-8
// encoding for the unicode value passed in.
QPDF_DLL
std::string toUTF8(unsigned long uval);
};
#endif // __QUTIL_HH__
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