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/* Taken from the Li18nux base test suite. */
#define _XOPEN_SOURCE 500
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>
int
main (void)
{
FILE *fp;
char *str = "abcdef";
wint_t ret, wc;
char fname[] = "/tmp/tst-ungetwc2.out.XXXXXX";
int fd;
long int pos;
int result = 0;
puts ("This program runs on en_US.UTF-8 locale.");
if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
{
fprintf (stderr, "Err: Cannot run on the en_US.UTF-8 locale\n");
exit (EXIT_FAILURE);
}
/* Write some characters to `testfile'. */
fd = mkstemp (fname);
if (fd == -1)
{
printf ("cannot open temp file: %m\n");
exit (EXIT_FAILURE);
}
if ((fp = fdopen (fd, "w")) == NULL)
{
fprintf (stderr, "Cannot open 'testfile'.\n");
exit (EXIT_FAILURE);
}
fputs (str, fp);
fclose (fp);
/* Open `testfile'. */
if ((fp = fopen (fname, "r")) == NULL)
{
fprintf (stderr, "Cannot open 'testfile'.");
exit (EXIT_FAILURE);
}
/* Get a character. */
wc = getwc (fp);
pos = ftell (fp);
printf ("After get a character: %ld\n", pos);
if (pos != 1)
result = 1;
/* Unget a character. */
ret = ungetwc (wc, fp);
if (ret == WEOF)
{
fprintf (stderr, "ungetwc() returns NULL.");
exit (EXIT_FAILURE);
}
pos = ftell (fp);
printf ("After unget a character: %ld\n", pos);
if (pos != 0)
result = 1;
/* Reget a character. */
wc = getwc (fp);
pos = ftell (fp);
printf ("After reget a character: %ld\n", pos);
if (pos != 1)
result = 1;
fclose (fp);
unlink (fname);
return result;
}
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