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#include "tests/lib.h"
#include <random.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syscall.h>
const char *test_name;
bool quiet = false;
static void
vmsg (const char *format, va_list args, const char *suffix)
{
/* We go to some trouble to stuff the entire message into a
single buffer and output it in a single system call, because
that'll (typically) ensure that it gets sent to the console
atomically. Otherwise kernel messages like "foo: exit(0)"
can end up being interleaved if we're unlucky. */
static char buf[1024];
snprintf (buf, sizeof buf, "(%s) ", test_name);
vsnprintf (buf + strlen (buf), sizeof buf - strlen (buf), format, args);
strlcpy (buf + strlen (buf), suffix, sizeof buf - strlen (buf));
write (STDOUT_FILENO, buf, strlen (buf));
}
void
msg (const char *format, ...)
{
va_list args;
if (quiet)
return;
va_start (args, format);
vmsg (format, args, "\n");
va_end (args);
}
void
fail (const char *format, ...)
{
va_list args;
va_start (args, format);
vmsg (format, args, ": FAILED\n");
va_end (args);
exit (1);
}
static void
swap (void *a_, void *b_, size_t size)
{
uint8_t *a = a_;
uint8_t *b = b_;
size_t i;
for (i = 0; i < size; i++)
{
uint8_t t = a[i];
a[i] = b[i];
b[i] = t;
}
}
void
shuffle (void *buf_, size_t cnt, size_t size)
{
char *buf = buf_;
size_t i;
for (i = 0; i < cnt; i++)
{
size_t j = i + random_ulong () % (cnt - i);
swap (buf + i * size, buf + j * size, size);
}
}
void
exec_children (const char *child_name, pid_t pids[], size_t child_cnt)
{
size_t i;
for (i = 0; i < child_cnt; i++)
{
char cmd_line[128];
snprintf (cmd_line, sizeof cmd_line, "%s %zu", child_name, i);
CHECK ((pids[i] = exec (cmd_line)) != PID_ERROR,
"exec child %zu of %zu: \"%s\"", i + 1, child_cnt, cmd_line);
}
}
void
wait_children (pid_t pids[], size_t child_cnt)
{
size_t i;
for (i = 0; i < child_cnt; i++)
{
int status = wait (pids[i]);
CHECK (status == (int) i,
"wait for child %zu of %zu returned %d (expected %zu)",
i + 1, child_cnt, status, i);
}
}
void
check_file_handle (int fd,
const char *file_name, const void *buf_, size_t size)
{
const char *buf = buf_;
size_t ofs = 0;
size_t file_size;
/* Warn about file of wrong size. Don't fail yet because we
may still be able to get more information by reading the
file. */
file_size = filesize (fd);
if (file_size != size)
msg ("size of %s (%zu) differs from expected (%zu)",
file_name, file_size, size);
/* Read the file block-by-block, comparing data as we go. */
while (ofs < size)
{
char block[512];
size_t block_size, ret_val;
block_size = size - ofs;
if (block_size > sizeof block)
block_size = sizeof block;
ret_val = read (fd, block, block_size);
if (ret_val != block_size)
fail ("read of %zu bytes at offset %zu in \"%s\" returned %zu",
block_size, ofs, file_name, ret_val);
compare_bytes (block, buf + ofs, block_size, ofs, file_name);
ofs += block_size;
}
/* Now fail due to wrong file size. */
if (file_size != size)
fail ("size of %s (%zu) differs from expected (%zu)",
file_name, file_size, size);
msg ("verified contents of \"%s\"", file_name);
}
void
check_file (const char *file_name, const void *buf, size_t size)
{
int fd;
CHECK ((fd = open (file_name)) > 1, "open \"%s\" for verification",
file_name);
check_file_handle (fd, file_name, buf, size);
msg ("close \"%s\"", file_name);
close (fd);
}
void
compare_bytes (const void *read_data_, const void *expected_data_, size_t size,
size_t ofs, const char *file_name)
{
const uint8_t *read_data = read_data_;
const uint8_t *expected_data = expected_data_;
size_t i, j;
size_t show_cnt;
if (!memcmp (read_data, expected_data, size))
return;
for (i = 0; i < size; i++)
if (read_data[i] != expected_data[i])
break;
for (j = i + 1; j < size; j++)
if (read_data[j] == expected_data[j])
break;
quiet = false;
msg ("%zu bytes read starting at offset %zu in \"%s\" differ "
"from expected.", j - i, ofs + i, file_name);
show_cnt = j - i;
if (j - i > 64)
{
show_cnt = 64;
msg ("Showing first differing %zu bytes.", show_cnt);
}
msg ("Data actually read:");
hex_dump (ofs + i, read_data + i, show_cnt, true);
msg ("Expected data:");
hex_dump (ofs + i, expected_data + i, show_cnt, true);
fail ("%zu bytes read starting at offset %zu in \"%s\" differ "
"from expected", j - i, ofs + i, file_name);
}
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