/* Class autosprintf - formatted output to an ostream.
  Copyright (C) 2002 Free Software Foundation, Inc.
  Written by Bruno Haible <[email protected]>, 2002.

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU Library General Public License as published
  by the Free Software Foundation; either version 2, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  USA.  */

/* Tell glibc's <stdio.h> to provide a prototype for vasprintf().
  This must come before <config.h> because <config.h> may include
  <features.h>, and once <features.h> has been included, it's too late.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE    1
#endif

/* Specification.  */
#include "autosprintf.h"

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "lib-asprintf.h"

namespace gnu
{

 /* Constructor: takes a format string and the printf arguments.  */
 autosprintf::autosprintf (const char *format, ...)
 {
   va_list args;
   va_start (args, format);
   if (vasprintf (&str, format, args) < 0)
     str = NULL;
   va_end (args);
 }

 /* Copy constructor.  Necessary because the destructor is nontrivial.  */
 autosprintf::autosprintf (const autosprintf& src)
 {
   str = (src.str != NULL ? strdup (src.str) : NULL);
 }

 /* Destructor: frees the temporarily allocated string.  */
 autosprintf::~autosprintf ()
 {
   free (str);
 }

 /* Conversion to string.  */
 autosprintf::operator char * () const
 {
   if (str != NULL)
     {
       size_t length = strlen (str) + 1;
       char *copy = new char[length];
       memcpy (copy, str, length);
       return copy;
     }
   else
     return NULL;
 }
 autosprintf::operator std::string () const
 {
   return std::string (str ? str : "(error in autosprintf)");
 }
}