Dogcows Code - chaz/tar/blob - lib/print-copyr.c

   1 /* copysym.c -- Return a copyright symbol suitable for the current locale.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <stddef.h>
  25
  26 #if HAVE_ICONV
  27 # include <iconv.h>
  28
  29 # if ! USE_INCLUDED_LIBINTL && HAVE_LANGINFO_CODESET
  30 #  include <langinfo.h>
  31 # endif
  32
  33 # if HAVE_STDLIB_H
  34 #  include <stdlib.h>
  35 # endif
  36 #endif
  37
  38 #include "copysym.h"
  39
  40 /* Store into BUF (of size BUFSIZE) a representation of the copyright
  41    symbol (C-in-a-circle) that is a valid text string for the current
  42    locale.  Return BUF if successful, and a pointer to some other
  43    string otherwise.  */
  44
  45 char const *
  46 copyright_symbol (char *buf, size_t bufsize)
  47 {
  48 #if HAVE_ICONV
  49   char const *outcharset = getenv ("OUTPUT_CHARSET");
  50
  51   if (! (outcharset && *outcharset))
  52     {
  53 #if USE_INCLUDED_LIBINTL
  54       extern char const *locale_charset (void);
  55       outcharset = locale_charset ();
  56 #else
  57 # if HAVE_LANGINFO_CODESET
  58       outcharset = nl_langinfo (CODESET);
  59 # endif
  60 #endif
  61     }
  62
  63   if (*outcharset)
  64     {
  65       iconv_t conv = iconv_open (outcharset, "UTF-8");
  66
  67       if (conv != (iconv_t) -1)
  68         {
  69           static char const copyright_utf_8[] = "\302\251";
  70           char ICONV_CONST *inptr = (char ICONV_CONST *) &copyright_utf_8;
  71           size_t inleft = sizeof copyright_utf_8;
  72           char *outptr = buf;
  73           size_t chars = iconv (conv, &inptr, &inleft, &outptr, &bufsize);
  74
  75           iconv_close (conv);
  76
  77           if (chars != (size_t) -1)
  78             return buf;
  79         }
  80     }
  81 #endif
  82
  83   /* "(C)" is the best we can do in ASCII.  */
  84   return "(C)";
  85 }