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Fewer macros in tar.c

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* src/tar.c (FORMAT_MASK, TAR_SIZE_SUFFIXES, SUBCL_READ)
(SUBCL_WRITE, SUBCL_UPDATE, SUBCL_TEST, SUBCL_OCCUR)
(IS_SUBCOMMAND_CLASS, NS_PRECISION_FORMAT_MASK):
Now constants or (lower-cased) functions, not macros.
(subcommand_class):
Replace hopeful comments with code implementing them.
This commit is contained in:
Paul Eggert
2024-08-19 09:52:39 -07:00
parent 7f557428a4
commit 350cc4077e
1 changed files with 49 additions and 39 deletions
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88
src/tar.c
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@@ -267,12 +267,16 @@ archive_format_string (enum archive_format fmt)
return "unknown?";
}
#define FORMAT_MASK(n) (1 << (n))
static int
format_mask (int n)
{
return 1 << n;
}
static void
assert_format (int fmt_mask)
{
if ((FORMAT_MASK (archive_format) & fmt_mask) == 0)
if ((format_mask (archive_format) & fmt_mask) == 0)
paxusage (_("GNU features wanted on incompatible archive format"));
}
@@ -1354,7 +1358,7 @@ parse_owner_group (char *arg, uintmax_t field_max, char const **name_option)
return u;
}
#define TAR_SIZE_SUFFIXES "bBcGgkKMmPTtw"
static char const TAR_SIZE_SUFFIXES[] = "bBcGgkKMmPTtw";
static char const *const sort_mode_arg[] = {
"none",
@@ -2283,28 +2287,34 @@ static const char *tar_authors[] = {
};
/* Subcommand classes */
#define SUBCL_READ 0x01 /* subcommand reads from the archive */
#define SUBCL_WRITE 0x02 /* subcommand writes to the archive */
#define SUBCL_UPDATE 0x04 /* subcommand updates existing archive */
#define SUBCL_TEST 0x08 /* subcommand tests archive header or meta-info */
#define SUBCL_OCCUR 0x10 /* subcommand allows the use of the occurrence
option */
enum
{
SUBCL_READ = 1 << 0, /* Reads from the archive. */
SUBCL_WRITE = 1 << 1, /* Writes to the archive. */
SUBCL_UPDATE = 1 << 2, /* Updates existing archive. */
SUBCL_TEST = 1 << 3, /* Tests archive header or meta-info. */
SUBCL_OCCUR = 1 << 4, /* Allows the use of the occurrence option. */
};
static int subcommand_class[] = {
/* UNKNOWN_SUBCOMMAND */ 0,
/* APPEND_SUBCOMMAND */ SUBCL_WRITE|SUBCL_UPDATE,
/* CAT_SUBCOMMAND */ SUBCL_WRITE,
/* CREATE_SUBCOMMAND */ SUBCL_WRITE,
/* DELETE_SUBCOMMAND */ SUBCL_WRITE|SUBCL_UPDATE|SUBCL_OCCUR,
/* DIFF_SUBCOMMAND */ SUBCL_READ|SUBCL_OCCUR,
/* EXTRACT_SUBCOMMAND */ SUBCL_READ|SUBCL_OCCUR,
/* LIST_SUBCOMMAND */ SUBCL_READ|SUBCL_OCCUR,
/* UPDATE_SUBCOMMAND */ SUBCL_WRITE|SUBCL_UPDATE,
/* TEST_LABEL_SUBCOMMAND */ SUBCL_TEST
static int const subcommand_class[] = {
[UNKNOWN_SUBCOMMAND ] = 0,
[APPEND_SUBCOMMAND ] = SUBCL_WRITE | SUBCL_UPDATE,
[CAT_SUBCOMMAND ] = SUBCL_WRITE,
[CREATE_SUBCOMMAND ] = SUBCL_WRITE,
[DELETE_SUBCOMMAND ] = SUBCL_WRITE | SUBCL_UPDATE | SUBCL_OCCUR,
[DIFF_SUBCOMMAND ] = SUBCL_READ | SUBCL_OCCUR,
[EXTRACT_SUBCOMMAND ] = SUBCL_READ | SUBCL_OCCUR,
[LIST_SUBCOMMAND ] = SUBCL_READ | SUBCL_OCCUR,
[UPDATE_SUBCOMMAND ] = SUBCL_WRITE | SUBCL_UPDATE,
[TEST_LABEL_SUBCOMMAND] = SUBCL_TEST
};
/* Return t if the subcommand_option is in class(es) f */
#define IS_SUBCOMMAND_CLASS(f) (subcommand_class[subcommand_option] & (f))
/* Is subcommand_option in class(es) f? */
static bool
is_subcommand_class (int f)
{
return subcommand_class[subcommand_option] & f;
}
void
more_options (int argc, char **argv, struct option_locus *loc)
@@ -2499,15 +2509,15 @@ decode_options (int argc, char **argv)
|| incremental_option
|| multi_volume_option
|| sparse_option)
assert_format (FORMAT_MASK (OLDGNU_FORMAT)
| FORMAT_MASK (GNU_FORMAT)
| FORMAT_MASK (POSIX_FORMAT));
assert_format (format_mask (OLDGNU_FORMAT)
| format_mask (GNU_FORMAT)
| format_mask (POSIX_FORMAT));
if (occurrence_option)
{
if (!name_more_files ())
paxusage (_("--occurrence is meaningless without a file list"));
if (!IS_SUBCOMMAND_CLASS (SUBCL_OCCUR))
if (!is_subcommand_class (SUBCL_OCCUR))
{
if (option_set_in_cl (OC_OCCURRENCE))
option_conflict_error ("--occurrence",
@@ -2577,7 +2587,7 @@ decode_options (int argc, char **argv)
paxusage (_("Cannot verify multi-volume archives"));
if (use_compress_program_option)
paxusage (_("Cannot verify compressed archives"));
if (!IS_SUBCOMMAND_CLASS (SUBCL_WRITE))
if (!is_subcommand_class (SUBCL_WRITE))
{
if (option_set_in_cl (OC_VERIFY))
option_conflict_error ("--verify",
@@ -2591,7 +2601,7 @@ decode_options (int argc, char **argv)
{
if (multi_volume_option)
paxusage (_("Cannot use multi-volume compressed archives"));
if (IS_SUBCOMMAND_CLASS (SUBCL_UPDATE))
if (is_subcommand_class (SUBCL_UPDATE))
paxusage (_("Cannot update compressed archives"));
if (subcommand_option == CAT_SUBCOMMAND)
paxusage (_("Cannot concatenate compressed archives"));
@@ -2615,27 +2625,27 @@ decode_options (int argc, char **argv)
--gray */
if (args.pax_option
&& archive_format != POSIX_FORMAT
&& !IS_SUBCOMMAND_CLASS (SUBCL_READ))
&& !is_subcommand_class (SUBCL_READ))
paxusage (_("--pax-option can be used only on POSIX archives"));
/* star creates non-POSIX typed archives with xattr support, so allow the
extra headers when reading */
if ((acls_option > 0)
&& archive_format != POSIX_FORMAT
&& !IS_SUBCOMMAND_CLASS (SUBCL_READ))
&& !is_subcommand_class (SUBCL_READ))
paxusage (_("--acls can be used only on POSIX archives"));
if ((selinux_context_option > 0)
&& archive_format != POSIX_FORMAT
&& !IS_SUBCOMMAND_CLASS (SUBCL_READ))
&& !is_subcommand_class (SUBCL_READ))
paxusage (_("--selinux can be used only on POSIX archives"));
if ((xattrs_option > 0)
&& archive_format != POSIX_FORMAT
&& !IS_SUBCOMMAND_CLASS (SUBCL_READ))
&& !is_subcommand_class (SUBCL_READ))
paxusage (_("--xattrs can be used only on POSIX archives"));
if (starting_file_option && !IS_SUBCOMMAND_CLASS (SUBCL_READ))
if (starting_file_option && !is_subcommand_class (SUBCL_READ))
{
if (option_set_in_cl (OC_STARTING_FILE))
option_conflict_error ("--starting-file",
@@ -2644,7 +2654,7 @@ decode_options (int argc, char **argv)
starting_file_option = false;
}
if (same_order_option && !IS_SUBCOMMAND_CLASS (SUBCL_READ))
if (same_order_option && !is_subcommand_class (SUBCL_READ))
{
if (option_set_in_cl (OC_SAME_ORDER))
option_conflict_error ("--same-order",
@@ -2994,16 +3004,16 @@ tar_stat_destroy (struct tar_stat_info *st)
memset (st, 0, sizeof (*st));
}
/* Format mask for all available formats that support nanosecond
timestamp resolution. */
#define NS_PRECISION_FORMAT_MASK FORMAT_MASK (POSIX_FORMAT)
/* Same as timespec_cmp, but ignore nanoseconds if current archive
format does not provide sufficient resolution. */
int
tar_timespec_cmp (struct timespec a, struct timespec b)
{
if (!(FORMAT_MASK (current_format) & NS_PRECISION_FORMAT_MASK))
/* Format mask for all available formats that support nanosecond
timestamp resolution. */
int ns_precision_format_mask = format_mask (POSIX_FORMAT);
if (!(format_mask (current_format) & ns_precision_format_mask))
a.tv_nsec = b.tv_nsec = 0;
return timespec_cmp (a, b);
}