#define _XOPEN_SOURCE 500
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>
int
main(void)
{
FILE *fp;
const 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 de_DE.UTF-8 locale.");
if (setlocale(LC_ALL, "de_DE.UTF-8") == NULL) {
fprintf(stderr, "Err: Cannot run on the de_DE.UTF-8 locale\n");
exit(EXIT_FAILURE);
}
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);
if ((fp = fopen(fname, "r")) == NULL) {
fprintf(stderr, "Cannot open 'testfile'.");
exit(EXIT_FAILURE);
}
wc = getwc(fp);
pos = ftell(fp);
printf("After get a character: %ld\n", pos);
if (pos != 1)
result = 1;
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;
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;
}
