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find: Allow unit suffixes to be used with the -size option

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The argument supplied to the `-size` option may now be one of the
following suffixes:

* b: 512-byte blocks. This is the default unit if no suffix is used.
* c: bytes
* w: two-byte words
* k: kibibytes (1024 bytes)
* M: mebibytes (1024 kibibytes)
* G: gibibytes (1024 mebibytes)

Sizes are rounded to the specified unit before comparison. The unit
suffixes are case-sensitive.
This commit is contained in:
Tim Ledbetter 2023-08-28 22:01:10 +01:00 committed by Andrew Kaster
parent 9b884a9605
commit aa7c2f1f0d
Notes: sideshowbarker 2024-07-17 02:37:08 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/aa7c2f1f0d
Pull-request: https://github.com/SerenityOS/serenity/pull/20825
Reviewed-by: https://github.com/ADKaster ✅
2 changed files with 46 additions and 14 deletions
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15
Base/usr/share/man/man1/find.md
View File

@ -32,9 +32,18 @@ specified commands, a `-print` command is implicitly appended.
name, a numerical UID may be specified.
* `-group name`: Checks if the file is owned by the given group. Instead of a
group name, a numerical GID may be specified.
* `-size number[c]`: Checks if the file has the given size in 512-byte blocks,
rounded up. If the size is followed by the `c` character, checks if the file
has the given size in bytes.
* `-size number[bcwkMG]`: Checks if the file uses the specified `n` units of
space rounded up to the nearest whole unit.
The unit of space may be specified by any of these suffixes:
* `b`: 512-byte blocks. This is the default unit if no suffix is used.
* `c`: bytes
* `w`: two-byte words
* `k`: kibibytes (1024 bytes)
* `M`: mebibytes (1024 kibibytes)
* `G`: gibibytes (1024 mebibytes)
* `-name pattern`: Checks if the file name matches the given global-style
pattern (case sensitive).
* `-iname pattern`: Checks if the file name matches the given global-style

45
Userland/Utilities/find.cpp
View File

@ -226,28 +226,51 @@ public:
SizeCommand(char const* arg)
{
StringView view { arg, strlen(arg) };
if (view.ends_with('c')) {
m_is_bytes = true;
auto suffix = view[view.length() - 1];
if (!is_ascii_digit(suffix)) {
switch (suffix) {
case 'c':
m_unit_size = 1;
break;
case 'w':
m_unit_size = 2;
break;
case 'k':
m_unit_size = KiB;
break;
case 'M':
m_unit_size = MiB;
break;
case 'G':
m_unit_size = GiB;
break;
case 'b':
// The behavior of this suffix is the same as no suffix.
break;
default:
fatal_error("Invalid -size type '{}'", suffix);
}
view = view.substring_view(0, view.length() - 1);
}
auto number = view.to_uint();
if (!number.has_value())
auto number = view.to_uint<u64>();
if (!number.has_value() || number.value() > AK::NumericLimits<off_t>::max())
fatal_error("Invalid size: \033[1m{}", arg);
m_size = number.value();
m_number_of_units = number.value();
}
private:
virtual bool evaluate(const struct stat& stat) const override
{
if (m_is_bytes)
return stat.st_size == m_size;
if (m_unit_size == 1)
return stat.st_size == m_number_of_units;
auto size_divided_by_512_rounded_up = (stat.st_size + 511) / 512;
return size_divided_by_512_rounded_up == m_size;
auto size_divided_by_unit_rounded_up = (stat.st_size + m_unit_size - 1) / m_unit_size;
return size_divided_by_unit_rounded_up == m_number_of_units;
}
off_t m_size { 0 };
bool m_is_bytes { false };
off_t m_number_of_units { 0 };
off_t m_unit_size { 512 };
};
class NameCommand : public Command {