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This example demonstrates how the library is used to convert ASCII compatible names (ACE) to internationalized domain names. Both input and output are in UTF-8 form.
/* example-tounicode.c --- Example ToUnicode() code showing how to use Libidn2. * * This code is placed under public domain. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <idn2.h> /* idn2_to_unicode_8z8z() */ /* * Compiling using pkg-config is recommended: * * $ cc -o example-to-unicode example-to-unicode.c $(pkg-config --cflags --libs libidn2) * $ ./example-tounicode * Input domain (ACE) encoded as `UTF-8': xn--nxasmm1c.com * * Read string (length 16): 78 6e 2d 2d 6e 78 61 73 6d 6d 31 63 2e 63 6f 6d * ACE label (length 14): 'βόλος.com' * */ int main (void) { char buf[BUFSIZ]; char *p; int rc; size_t i; if (!fgets (buf, BUFSIZ, stdin)) perror ("fgets"); buf[strlen (buf) - 1] = '\0'; printf ("Read string (length %ld): ", (long int) strlen (buf)); for (i = 0; i < strlen (buf); i++) printf ("%02x ", (unsigned) buf[i] & 0xFF); printf ("\n"); rc = idn2_to_unicode_8z8z (buf, &p, 0); if (rc != IDNA_SUCCESS) { printf ("ToUnicode() failed (%d): %s\n", rc, idn2_strerror (rc)); return EXIT_FAILURE; } printf ("ACE label (length %ld): '%s'\n", (long int) strlen (p), p); free (p); /* or idn2_free() */ return 0; }