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Re: [Qemu-devel] [PATCH v2 2/7] cutils: Add bytes_to_str() to format byt
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v2 2/7] cutils: Add bytes_to_str() to format byte values |
Date: |
Wed, 13 Oct 2010 11:28:42 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 |
Am 13.10.2010 11:15, schrieb Markus Armbruster:
> Stefan Hajnoczi <address@hidden> writes:
>
>> From: Anthony Liguori <address@hidden>
>>
>> This common function converts byte counts to human-readable strings with
>> proper units.
>>
>> Signed-off-by: Anthony Liguori <address@hidden>
>> Signed-off-by: Stefan Hajnoczi <address@hidden>
>> ---
>> cutils.c | 15 +++++++++++++++
>> qemu-common.h | 1 +
>> 2 files changed, 16 insertions(+), 0 deletions(-)
>>
>> diff --git a/cutils.c b/cutils.c
>> index 6c32198..5041203 100644
>> --- a/cutils.c
>> +++ b/cutils.c
>> @@ -301,3 +301,18 @@ int get_bits_from_size(size_t size)
>> return __builtin_ctzl(size);
>> #endif
>> }
>> +
>> +void bytes_to_str(char *buffer, size_t buffer_len, uint64_t size)
>
> Why is the size argument uint64_t and not size_t?
size_t would be rather small for disk images on 32 bit hosts.
> The name bytes_to_str() suggests you're formatting a sequence of bytes.
> What about sztostr()? Matches Jes's strtosz().
>
>> +{
>> + if (size < (1ULL << 10)) {
>> + snprintf(buffer, buffer_len, "%" PRIu64 " byte(s)", size);
>> + } else if (size < (1ULL << 20)) {
>> + snprintf(buffer, buffer_len, "%" PRIu64 " KB(s)", size >> 10);
>> + } else if (size < (1ULL << 30)) {
>> + snprintf(buffer, buffer_len, "%" PRIu64 " MB(s)", size >> 20);
>> + } else if (size < (1ULL << 40)) {
>> + snprintf(buffer, buffer_len, "%" PRIu64 " GB(s)", size >> 30);
>> + } else {
>> + snprintf(buffer, buffer_len, "%" PRIu64 " TB(s)", size >> 40);
>> + }
>
> Sure you want to truncate rather than round?
>
> The "(s)" sure are ugly. We don't usually add plural-s after a unit: we
> write ten milliseconds as 10ms, not 10ms(s).
I suggest taking the output format from cvtstr in cmd.c, so that qemu-io
output stays the same when switching to a common function (it says "10
KiB" and "1 bytes").
Kevin
[Qemu-devel] [PATCH v2 2/7] cutils: Add bytes_to_str() to format byte values, Stefan Hajnoczi, 2010/10/08
[Qemu-devel] [PATCH v2 1/7] qcow2: Make get_bits_from_size() common, Stefan Hajnoczi, 2010/10/08
[Qemu-devel] [PATCH v2 5/7] qed: Table, L2 cache, and cluster functions, Stefan Hajnoczi, 2010/10/08
[Qemu-devel] [PATCH v2 7/7] qed: Consistency check support, Stefan Hajnoczi, 2010/10/08
[Qemu-devel] Re: [PATCH v2 0/7] qed: Add QEMU Enhanced Disk format, Kevin Wolf, 2010/10/11
Re: [Qemu-devel] [PATCH v2 0/7] qed: Add QEMU Enhanced Disk format, Stefan Hajnoczi, 2010/10/16