iconv-demo-ucs-4-internal.c

/* Demo  for Libiconv.   A  simple  example to  demonstrate  the use  of
   "UCS-4-INTERNAL": convert a  string in UTF-8 encoding to  an array of
   integers representing  Unicode code  points.  To compile  the program
   with Libiconv on a GNU+Linux system:

      $ gcc -o iconv-demo iconv-demo.c -l iconv

*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <iconv.h>

static void
logmsg (const char * message)
{
  fprintf(stderr, message);
  fprintf(stderr, "\n");
}
int
main (int argc, const char *const argv[])
{
  iconv_t	context;
  context = iconv_open("UCS-4-INTERNAL", "US-ASCII");
  if (((iconv_t)(-1)) == context) {
    logmsg("error initialising context");
    goto error;
  }
  {
    char *	in_buffer = "ciao";
    size_t	in_bytes_left = strlen(in_buffer);
    uint32_t	ou_bytes[4] = { -1, -1, -1, -1 };
    size_t	ou_bytes_left = sizeof(uint32_t) * 4;
    char *	ou_buffer = (char*)&ou_bytes;
    size_t	rv;
    errno = 0;
    rv = iconv(context,
	       &in_buffer, &in_bytes_left,
	       &ou_buffer, &ou_bytes_left);
    if (((size_t)-1) == rv) {
      logmsg("error converting");
      goto context_error;
    } else {
      /* The output for the input "ciao" should be: 99, 105, 97, 111. */
      printf("retval %ld, output: %ld, %ld, %ld, %ld\n", rv,
	     (unsigned long)ou_bytes[0], (unsigned long)ou_bytes[1],
	     (unsigned long)ou_bytes[2], (unsigned long)ou_bytes[3]);
    }
  }
  iconv_close(context);
  logmsg("Success!!!");
  exit(EXIT_SUCCESS);
 context_error:
  iconv_close(context);
 error:
  logmsg("Error!!!");
  exit(EXIT_FAILURE);
}

/* end of file */