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 #if HAVE_ICONV
  25 # include <iconv.h>
  26
  27 # if HAVE_STDLIB_H
  28 #  include <stdlib.h>
  29 # endif
  30 #endif
  31
  32 #include "copysym.h"
  33
  34 /* Store into BUF (of size BUFSIZE) a representation of the copyright
  35    symbol (C-in-a-circle) that is a valid text string for the current
  36    locale.  Return BUF if successful, and a pointer to some other
  37    string otherwise.  */
  38
  39 char const *
  40 copyright_symbol (char *buf, size_t bufsize)
  41 {
  42 #if HAVE_ICONV
  43   char const *outcharset = getenv ("OUTPUT_CHARSET");
  44
  45   if (! (outcharset && *outcharset))
  46     {
  47       extern char const *locale_charset (void);
  48       outcharset = locale_charset ();
  49     }
  50
  51   if (*outcharset)
  52     {
  53       iconv_t conv = iconv_open (outcharset, "UTF-8");
  54
  55       if (conv != (iconv_t) -1)
  56         {
  57           static char const copyright_utf_8[] = "\302\251";
  58           char ICONV_CONST *inptr = (char ICONV_CONST *) &copyright_utf_8;
  59           size_t inleft = sizeof copyright_utf_8;
  60           char *outptr = buf;
  61           size_t chars = iconv (conv, &inptr, &inleft, &outptr, &bufsize);
  62
  63           iconv_close (conv);
  64
  65           if (chars != (size_t) -1)
  66             return buf;
  67         }
  68     }
  69 #endif
  70
  71   /* "(C)" is the best we can do in ASCII.  */
  72   return "(C)";
  73 }