-o, --io-blocks treat SIZE as number of IO blocks instead of bytes\n\
"), stdout);
fputs (_("\
- -r, --reference=FILE use this FILE's size\n\
- -s, --size=SIZE use this SIZE\n"), stdout);
+ -r, --reference=RFILE base size on RFILE\n\
+ -s, --size=SIZE set or adjust the file size by SIZE\n"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_size_note ();
SIZE may also be prefixed by one of the following modifying characters:\n\
`+' extend by, `-' reduce by, `<' at most, `>' at least,\n\
`/' round down to multiple of, `%' round up to multiple of.\n"), stdout);
- fputs (_("\
-\n\
-Note that the -r and -s options are mutually exclusive.\n\
-"), stdout);
emit_ancillary_info ();
}
exit (status);
/* return 1 on error, 0 on success */
static int
-do_ftruncate (int fd, char const *fname, off_t ssize, rel_mode_t rel_mode)
+do_ftruncate (int fd, char const *fname, off_t ssize, off_t rsize,
+ rel_mode_t rel_mode)
{
struct stat sb;
off_t nsize;
- if ((block_mode || rel_mode) && fstat (fd, &sb) != 0)
+ if ((block_mode || (rel_mode && rsize < 0)) && fstat (fd, &sb) != 0)
{
error (0, errno, _("cannot fstat %s"), quote (fname));
return 1;
}
if (rel_mode)
{
- uintmax_t const fsize = sb.st_size;
+ uintmax_t const fsize = rsize < 0 ? sb.st_size : rsize;
- if (sb.st_size < 0)
+ if (rsize < 0 && sb.st_size < 0)
{
/* Complain only for a regular file, a directory,
or a shared memory object, as POSIX 1003.1-2004 specifies
{
bool got_size = false;
off_t size IF_LINT (= 0);
+ off_t rsize = -1;
rel_mode_t rel_mode = rm_abs;
mode_t omode;
int c, errors = 0, fd = -1, oflags;
argc -= optind;
/* must specify either size or reference file */
- if ((ref_file && got_size) || (!ref_file && !got_size))
+ if (!ref_file && !got_size)
+ {
+ error (0, 0, _("you must specify either %s or %s"),
+ quote_n (0, "--size"), quote_n (1, "--reference"));
+ usage (EXIT_FAILURE);
+ }
+ /* must specify a relative size with a reference file */
+ if (ref_file && got_size && !rel_mode)
{
- error (0, 0, _("you must specify one of %s or %s"),
+ error (0, 0, _("you must specify a relative %s with %s"),
quote_n (0, "--size"), quote_n (1, "--reference"));
usage (EXIT_FAILURE);
}
struct stat sb;
if (stat (ref_file, &sb) != 0)
error (EXIT_FAILURE, errno, _("cannot stat %s"), quote (ref_file));
- size = sb.st_size;
+ if (!got_size)
+ size = sb.st_size;
+ else
+ rsize = sb.st_size;
}
oflags = O_WRONLY | (no_create ? 0 : O_CREAT) | O_NONBLOCK;
if (fd != -1)
{
- errors += do_ftruncate (fd, fname, size, rel_mode);
+ errors += do_ftruncate (fd, fname, size, rsize, rel_mode);
if (close (fd) != 0)
{
error (0, errno, _("closing %s"), quote (fname));
# must specify size. don't default to 0
truncate file && fail=1
-# mixture of size & reference not allowed
+# mixture of absolute size & reference not allowed
truncate --size=0 --reference=file file && fail=1
# blocks without size is not valid
truncate --size=" +1" file || fail=1 #file now 2
test $(stat --format %s file) = 2 || fail=1
+# reference allowed with relative size
+truncate --size=" +1" -r file file || fail=1 #file now 3
+test $(stat --format %s file) = 3 || fail=1
+
+# reference allowed alone also
+truncate -r file file || fail=1 #file still 3
+test $(stat --format %s file) = 3 || fail=1
+truncate -r file file2 || fail=1 #file2 now 3
+test $(stat --format %s file2) = 3 || fail=1
+
Exit $fail