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Treat all integer multiplier suffixes as base-2.

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Originally both base-2 and base-10 were supported, but since
there seems to be little need for base-10 in XZ Utils, treat
everything as base-2 and also be more relaxed about the case
of the first letter of the suffix. Now xz will accept e.g.
KiB, Ki, k, K, kB, and KB, and interpret them all as 1024. The
recommended spelling of the suffixes are still KiB, MiB, and GiB.
This commit is contained in:
Lasse Collin 2010-03-07 13:59:32 +02:00
parent 00fc1211ae
commit cf38da00a1
3 changed files with 66 additions and 75 deletions
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53
src/xz/util.c
View File

@ -65,39 +65,32 @@ str_to_uint64(const char *name, const char *value, uint64_t min, uint64_t max)
} while (*value >= '0' && *value <= '9');
if (*value != '\0') {
// Look for suffix.
static const struct {
const char name[4];
uint64_t multiplier;
} suffixes[] = {
{ "k", UINT64_C(1000) },
{ "kB", UINT64_C(1000) },
{ "M", UINT64_C(1000000) },
{ "MB", UINT64_C(1000000) },
{ "G", UINT64_C(1000000000) },
{ "GB", UINT64_C(1000000000) },
{ "Ki", UINT64_C(1024) },
{ "KiB", UINT64_C(1024) },
{ "Mi", UINT64_C(1048576) },
{ "MiB", UINT64_C(1048576) },
{ "Gi", UINT64_C(1073741824) },
{ "GiB", UINT64_C(1073741824) }
};
// Look for suffix. Originally this supported both base-2
// and base-10, but since there seems to be little need
// for base-10 in this program, treat everything as base-2
// and also be more relaxed about the case of the first
// letter of the suffix.
uint64_t multiplier = 0;
for (size_t i = 0; i < ARRAY_SIZE(suffixes); ++i) {
if (strcmp(value, suffixes[i].name) == 0) {
multiplier = suffixes[i].multiplier;
break;
}
}
if (*value == 'k' || *value == 'K')
multiplier = UINT64_C(1) << 10;
else if (*value == 'm' || *value == 'M')
multiplier = UINT64_C(1) << 20;
else if (*value == 'g' || *value == 'G')
multiplier = UINT64_C(1) << 30;
++value;
// Allow also e.g. Ki, KiB, and KB.
if (*value != '\0' && strcmp(value, "i") != 0
&& strcmp(value, "iB") != 0
&& strcmp(value, "B") != 0)
multiplier = 0;
if (multiplier == 0) {
message(V_ERROR, _("%s: Invalid multiplier suffix. "
"Valid suffixes:"), value);
message_fatal("`k' (10^3), `M' (10^6), `G' (10^9) "
"`Ki' (2^10), `Mi' (2^20), "
"`Gi' (2^30)");
message(V_ERROR, _("%s: Invalid multiplier suffix"),
value - 1);
message_fatal(_("Valid suffixes are `KiB' (2^10), "
"`MiB' (2^20), and `GiB' (2^30)."));
}
// Don't overflow here either.

48
src/xz/xz.1
View File

@ -238,28 +238,36 @@ In most places where an integer argument is expected, an optional suffix
is supported to easily indicate large integers. There must be no space
between the integer and the suffix.
.TP
.BR k " or " kB
The integer is multiplied by 1,000 (10^3). For example,
.B "5k"
or
.B "5kB"
equals
.BR "5000" .
.B KiB
The integer is multiplied by 1,024 (2^10). Also
.BR Ki ,
.BR k ,
.BR kB ,
.BR K ,
and
.B KB
are accepted as synonyms for
.BR KiB .
.TP
.BR Ki " or " KiB
The integer is multiplied by 1,024 (2^10).
.B MiB
The integer is multiplied by 1,048,576 (2^20). Also
.BR Mi ,
.BR m ,
.BR M ,
and
.B MB
are accepted as synonyms for
.BR MiB .
.TP
.BR M " or " MB
The integer is multiplied by 1,000,000 (10^6).
.TP
.BR Mi " or " MiB
The integer is multiplied by 1,048,576 (2^20).
.TP
.BR G " or " GB
The integer is multiplied by 1,000,000,000 (10^9).
.TP
.BR Gi " or " GiB
The integer is multiplied by 1,073,741,824 (2^30).
.B GiB
The integer is multiplied by 1,073,741,824 (2^30). Also
.BR Gi ,
.BR g ,
.BR G ,
and
.B GB
are accepted as synonyms for
.BR GiB .
.PP
A special value
.B max

40
src/xzdec/xzdec.c
View File

@ -183,34 +183,24 @@ str_to_uint64(const char *value, uint64_t max)
if (*value != '\0') {
// Look for suffix.
static const struct {
const char name[4];
uint32_t multiplier;
} suffixes[] = {
{ "k", 1000 },
{ "kB", 1000 },
{ "M", 1000000 },
{ "MB", 1000000 },
{ "G", 1000000000 },
{ "GB", 1000000000 },
{ "Ki", 1024 },
{ "KiB", 1024 },
{ "Mi", 1048576 },
{ "MiB", 1048576 },
{ "Gi", 1073741824 },
{ "GiB", 1073741824 }
};
uint64_t multiplier = 0;
if (*value == 'k' || *value == 'K')
multiplier = UINT64_C(1) << 10;
else if (*value == 'm' || *value == 'M')
multiplier = UINT64_C(1) << 20;
else if (*value == 'g' || *value == 'G')
multiplier = UINT64_C(1) << 30;
uint32_t multiplier = 0;
for (size_t i = 0; i < ARRAY_SIZE(suffixes); ++i) {
if (strcmp(value, suffixes[i].name) == 0) {
multiplier = suffixes[i].multiplier;
break;
}
}
++value;
// Allow also e.g. Ki, KiB, and KB.
if (*value != '\0' && strcmp(value, "i") != 0
&& strcmp(value, "iB") != 0
&& strcmp(value, "B") != 0)
multiplier = 0;
if (multiplier == 0) {
my_errorf("%s: Invalid suffix", value);
my_errorf("%s: Invalid suffix", value - 1);
exit(EXIT_FAILURE);
}