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/* Test program for ungetc/ftell interaction bug. */
#include <stdio.h>
#include <support/xunistd.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);
}
xwrite (fd, pattern, sizeof (pattern));
close (fd);
}
static int
do_one_test (int mode)
{
FILE *f;
f = fopen (temp_file, "r");
if (f == NULL)
{
printf ("could not open temporary file: %m\n");
return 1;
}
if (mode == 1 && ftell (f) != 0)
{
printf ("first ftell returned wrong position %ld\n", ftell (f));
return 1;
}
if (fgetc (f) != '1' || fgetc (f) != '2')
{
puts ("fgetc failed");
return 1;
}
if (mode == 2 && ftell (f) != 2)
{
printf ("second ftell returned wrong position %ld\n", ftell (f));
return 1;
}
if (ungetc ('6', f) != '6')
{
puts ("ungetc failed");
return 1;
}
if (ftell (f) != 1)
{
printf ("third ftell returned wrong position %ld\n", ftell (f));
return 1;
}
if (fgetc (f) != '6')
{
puts ("fgetc failed");
return 1;
}
if (ftell (f) != 2)
{
printf ("fourth ftell returned wrong position %ld\n", ftell (f));
return 1;
}
fclose (f);
return 0;
}
static int
do_test (void)
{
int mode;
for (mode = 0; mode <= 2; mode++)
if (do_one_test (mode))
return 1;
return 0;
}
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