62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
|
/* Test program for ungetc/ftell interaction bug. */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
static void do_prepare (void);
|
||
|
|
#define PREPARE(argc, argv) do_prepare ()
|
||
|
|
static int do_test (void);
|
||
|
|
#define TEST_FUNCTION do_test ()
|
||
|
|
#include <test-skeleton.c>
|
||
|
|
|
||
|
|
static const char pattern[] = "12345";
|
||
|
|
static char *temp_file;
|
||
|
|
|
||
|
|
static void
|
||
|
|
do_prepare (void)
|
||
|
|
{
|
||
|
|
int fd = create_temp_file ("bug-ungetc.", &temp_file);
|
||
|
|
if (fd == -1)
|
||
|
|
{
|
||
|
|
printf ("cannot create temporary file: %m\n");
|
||
|
|
exit (1);
|
||
|
|
}
|
||
|
|
write (fd, pattern, sizeof (pattern));
|
||
|
|
close (fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
do_test (void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
FILE *f;
|
||
|
|
char buf[10];
|
||
|
|
long offset, diff;
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
f = fopen (temp_file, "rw");
|
||
|
|
|
||
|
|
rewind (f);
|
||
|
|
for (i = 0; i < 3; i++)
|
||
|
|
printf ("%c\n", getc (f));
|
||
|
|
offset = ftell (f);
|
||
|
|
printf ("offset = %ld\n", offset);
|
||
|
|
if (ungetc ('4', f) != '4')
|
||
|
|
{
|
||
|
|
printf ("ungetc failed\n");
|
||
|
|
abort ();
|
||
|
|
}
|
||
|
|
printf ("offset after ungetc = %ld\n", ftell (f));
|
||
|
|
|
||
|
|
i = fread ((void *) buf, 4, (size_t) 1, f);
|
||
|
|
printf ("read %d (%c), offset = %ld\n", i, buf[0], ftell (f));
|
||
|
|
diff = ftell (f) - offset;
|
||
|
|
if (diff != 3)
|
||
|
|
{
|
||
|
|
printf ("ftell did not update properly. got %ld, expected 3\n", diff);
|
||
|
|
result = 1;
|
||
|
|
}
|
||
|
|
fclose (f);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|