char *buffer;
size_t buffer_size;
-void
-die (char *fmt, ...)
+static void die (char const *, ...) __attribute__ ((noreturn,
+ format (printf, 1, 2)));
+static void
+die (char const *fmt, ...)
{
va_list ap;
vfprintf (stderr, fmt, ap);
va_end (ap);
fprintf (stderr, "\n");
+ exit (1);
}
-void
+static void
mkhole (int fd, off_t displ)
{
- if (displ = lseek (fd, displ, SEEK_CUR) == -1)
+ if (lseek (fd, displ, SEEK_CUR) == -1)
{
perror ("lseek");
exit (1);
ftruncate (fd, lseek (fd, 0, SEEK_CUR));
}
-void
+static void
mksparse (int fd, off_t displ, char *marks)
{
- int i;
-
for (; *marks; marks++)
{
memset (buffer, *marks, buffer_size);
perror ("write");
exit (1);
}
-
+
if (lseek (fd, displ, SEEK_CUR) == -1)
{
perror ("lseek");
}
}
-void
-usage ()
+static void usage (void) __attribute__ ((noreturn));
+static void
+usage (void)
{
printf ("Usage: mksparse filename blocksize disp letters [disp letters...] [disp]\n");
exit (1);
}
-int
+static int
xlat_suffix (off_t *vp, char *p)
{
if (p[1])
case 'g':
case 'G':
*vp *= 1024;
-
+
case 'm':
case 'M':
*vp *= 1024;
}
return 0;
}
-
+
int
main (int argc, char **argv)
{
int fd;
char *p;
off_t n;
-
+
progname = strrchr (argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
-
+
if (argc < 4)
usage ();
fd = open (argv[1], O_CREAT|O_TRUNC|O_RDWR, 0644);
if (fd < 0)
die ("cannot open %s", argv[1]);
-
+
n = strtoul (argv[2], &p, 0);
if (n <= 0 || (*p && xlat_suffix (&n, p)))
die ("Invalid buffer size: %s", argv[2]);
buffer = malloc (buffer_size);
if (!buffer)
die ("Not enough memory");
-
+
for (i = 3; i < argc; i += 2)
{
off_t displ;
-
+
displ = strtoul (argv[i], &p, 0);
if (displ < 0 || (*p && xlat_suffix (&displ, p)))
die ("Invalid displacement: %s", argv[i]);
else
mksparse (fd, displ, argv[i+1]);
}
-
+
close(fd);
return 0;
}