libidn: Example 3

1 
1 9.3 Example 3
1 =============
1 
1 This example demonstrates how the library is used to convert
1 internationalized domain names into ASCII compatible names.
1 
1 /* example3.c --- Example ToASCII() code showing how to use Libidn.
1  * Copyright (C) 2002-2016 Simon Josefsson
1  *
1  * This file is part of GNU Libidn.
1  *
1  * This program is free software: you can redistribute it and/or modify
1  * it under the terms of the GNU General Public License as published by
1  * the Free Software Foundation, either version 3 of the License, or
1  * (at your option) any later version.
1  *
1  * This program is distributed in the hope that it will be useful,
1  * but WITHOUT ANY WARRANTY; without even the implied warranty of
1  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
1  * GNU General Public License for more details.
1  *
1  * You should have received a copy of the GNU General Public License
1  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
1  *
1  */
1 
1 #include <stdio.h>
1 #include <stdlib.h>
1 #include <string.h>
1 #include <locale.h>		/* setlocale() */
1 #include <stringprep.h>		/* stringprep_locale_charset() */
1 #include <idna.h>		/* idna_to_ascii_lz() */
1 
1 /*
1  * Compiling using libtool and pkg-config is recommended:
1  *
1  * $ libtool cc -o example3 example3.c `pkg-config --cflags --libs libidn`
1  * $ ./example3
1  * Input domain encoded as `ISO-8859-1': www.räksmörgåsª.example
1  * Read string (length 23): 77 77 77 2e 72 e4 6b 73 6d f6 72 67 e5 73 aa 2e 65 78 61 6d 70 6c 65
1  * ACE label (length 33): 'www.xn--rksmrgsa-0zap8p.example'
1  * 77 77 77 2e 78 6e 2d 2d 72 6b 73 6d 72 67 73 61 2d 30 7a 61 70 38 70 2e 65 78 61 6d 70 6c 65
1  * $
1  *
1  */
1 
1 int
1 main (void)
1 {
1   char buf[BUFSIZ];
1   char *p;
1   int rc;
1   size_t i;
1 
1   setlocale (LC_ALL, "");
1 
1   printf ("Input domain encoded as `%s': ", stringprep_locale_charset ());
1   fflush (stdout);
1   if (!fgets (buf, BUFSIZ, stdin))
1     perror ("fgets");
1   buf[strlen (buf) - 1] = '\0';
1 
1   printf ("Read string (length %ld): ", (long int) strlen (buf));
1   for (i = 0; i < strlen (buf); i++)
1     printf ("%02x ", (unsigned) buf[i] & 0xFF);
1   printf ("\n");
1 
1   rc = idna_to_ascii_lz (buf, &p, 0);
1   if (rc != IDNA_SUCCESS)
1     {
1       printf ("ToASCII() failed (%d): %s\n", rc, idna_strerror (rc));
1       return EXIT_FAILURE;
1     }
1 
1   printf ("ACE label (length %ld): '%s'\n", (long int) strlen (p), p);
1   for (i = 0; i < strlen (p); i++)
1     printf ("%02x ", (unsigned) p[i] & 0xFF);
1   printf ("\n");
1 
1   free (p);
1 
1   return 0;
1 }
1