This example demonstrates how the stringprep functions are used.
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <locale.h> /* setlocale() */ #include <stringprep.h> /* * Compiling using libtool and pkg-config is recommended: * * $ libtool cc -o example example.c `pkg-config --cflags --libs libidn` * $ ./example * Input string encoded as `ISO-8859-1': ยช * Before locale2utf8 (length 2): aa 0a * Before stringprep (length 3): c2 aa 0a * After stringprep (length 2): 61 0a * $ * */ int main (void) { char buf[BUFSIZ]; char *p; int rc; size_t i; setlocale (LC_ALL, ""); printf ("Input string encoded as `%s': ", stringprep_locale_charset ()); fflush (stdout); if (!fgets (buf, BUFSIZ, stdin)) perror ("fgets"); buf[strlen (buf) - 1] = '\0'; printf ("Before locale2utf8 (length %ld): ", (long int) strlen (buf)); for (i = 0; i < strlen (buf); i++) printf ("%02x ", (unsigned) buf[i] & 0xFF); printf ("\n"); p = stringprep_locale_to_utf8 (buf); if (p) { strcpy (buf, p); free (p); } else printf ("Could not convert string to UTF-8, continuing anyway...\n"); printf ("Before stringprep (length %ld): ", (long int) strlen (buf)); for (i = 0; i < strlen (buf); i++) printf ("%02x ", (unsigned) buf[i] & 0xFF); printf ("\n"); rc = stringprep (buf, BUFSIZ, 0, stringprep_nameprep); if (rc != STRINGPREP_OK) printf ("Stringprep failed (%d): %s\n", rc, stringprep_strerror (rc)); else { printf ("After stringprep (length %ld): ", (long int) strlen (buf)); for (i = 0; i < strlen (buf); i++) printf ("%02x ", (unsigned) buf[i] & 0xFF); printf ("\n"); } return 0; }