gnu/dist/gettext/gettext-runtime/libasprintf/autosprintf.cc

   1 /* Class autosprintf - formatted output to an ostream.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU Library General Public License as published
   7    by the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18    USA.  */
  19
  20 /* Tell glibc's <stdio.h> to provide a prototype for vasprintf().
  21    This must come before <config.h> because <config.h> may include
  22    <features.h>, and once <features.h> has been included, it's too late.  */
  23 #ifndef _GNU_SOURCE
  24 # define _GNU_SOURCE    1
  25 #endif
  26
  27 /* Specification.  */
  28 #include "autosprintf.h"
  29
  30 #include <stdarg.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "lib-asprintf.h"
  34
  35 namespace gnu
  36 {
  37
  38   /* Constructor: takes a format string and the printf arguments.  */
  39   autosprintf::autosprintf (const char *format, ...)
  40   {
  41     va_list args;
  42     va_start (args, format);
  43     if (vasprintf (&str, format, args) < 0)
  44       str = NULL;
  45     va_end (args);
  46   }
  47
  48   /* Copy constructor.  Necessary because the destructor is nontrivial.  */
  49   autosprintf::autosprintf (const autosprintf& src)
  50   {
  51     str = (src.str != NULL ? strdup (src.str) : NULL);
  52   }
  53
  54   /* Destructor: frees the temporarily allocated string.  */
  55   autosprintf::~autosprintf ()
  56   {
  57     free (str);
  58   }
  59
  60   /* Conversion to string.  */
  61   autosprintf::operator char * () const
  62   {
  63     if (str != NULL)
  64       {
  65         size_t length = strlen (str) + 1;
  66         char *copy = new char[length];
  67         memcpy (copy, str, length);
  68         return copy;
  69       }
  70     else
  71       return NULL;
  72   }
  73   autosprintf::operator std::string () const
  74   {
  75     return std::string (str ? str : "(error in autosprintf)");
  76   }
  77 }