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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static char fname[] = "/tmp/rndseek.XXXXXX";
static char tempdata[65 * 1024];
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
static int
fp_test (FILE *fp)
{
int result = 0;
int rounds = 10000;
do
{
int idx = random () % (sizeof (tempdata) - 2);
char ch1;
char ch2;
if (fseek (fp, idx, SEEK_SET) != 0)
{
printf ("%d: fseek failed: %m\n", rounds);
result = 1;
break;
}
ch1 = fgetc_unlocked (fp);
ch2 = tempdata[idx];
if (ch1 != ch2)
{
printf ("%d: character at index %d not what is expected ('%c' vs '%c')\n",
rounds, idx, ch1, ch2);
result = 1;
break;
}
ch1 = fgetc (fp);
ch2 = tempdata[idx + 1];
if (ch1 != ch2)
{
printf ("%d: character at index %d not what is expected ('%c' vs '%c')\n",
rounds, idx + 1, ch1, ch2);
result = 1;
break;
}
}
while (--rounds > 0);
fclose (fp);
return result;
}
static int
do_test (void)
{
int fd;
FILE *fp;
int i;
int result;
fd = mkstemp (fname);
if (fd == -1)
{
printf ("cannot open temporary file: %m\n");
return 1;
}
/* Make sure the file gets removed. */
add_temp_file (fname);
/* Repeatability demands this. */
srandom (42);
/* First create some temporary data. */
for (i = 0; i < sizeof (tempdata); ++i)
tempdata[i] = (char) random ();
/* Write this data to a file. */
if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata)))
!= sizeof (tempdata))
{
printf ("cannot wrote data to temporary file: %m\n");
return 1;
}
/* Now try reading the data. */
fp = fdopen (dup (fd), "r");
if (fp == NULL)
{
printf ("cannot duplicate temporary file descriptor: %m\n");
return 1;
}
rewind (fp);
for (i = 0; i < sizeof (tempdata); ++i)
{
int ch0 = fgetc (fp);
char ch1 = ch0;
char ch2 = tempdata[i];
if (ch0 == EOF)
{
puts ("premature end of file while reading data");
return 1;
}
if (ch1 != ch2)
{
printf ("%d: '%c' vs '%c'\n", i, ch1, ch2);
return 1;
}
}
result = fp_test (fp);
fp = fopen (fname, "r");
result |= fp_test (fp);
fp = fopen64 (fname, "r");
result |= fp_test (fp);
/* The "rw" mode will prevent the mmap-using code from being used. */
fp = fdopen (fd, "rw");
result = fp_test (fp);
fp = fopen (fname, "rw");
result |= fp_test (fp);
fp = fopen64 (fname, "rw");
result |= fp_test (fp);
return result;
}
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