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truncate: Allow size suffixes to be used with the -s option

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The base 2 size suffixes: 'K', 'M' and 'G' may now be used when
specifying a file size with the `-s` option.
This commit is contained in:
Tim Ledbetter 2023-07-22 15:05:16 +01:00 • committed by Andreas Kling
parent fb27702981
commit 8e79afebb9
1 changed files with 25 additions and 2 deletions
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27
Userland/Utilities/truncate.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <AK/CharacterTypes.h>
#include <LibCore/ArgsParser.h> #include <LibCore/ArgsParser.h>
#include <LibCore/System.h> #include <LibCore/System.h>
#include <LibMain/Main.h> #include <LibMain/Main.h>
@ -53,12 +54,34 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
break; break;
} }
auto suffix = resize[resize.length() - 1];
i64 multiplier = 1;
if (!AK::is_ascii_digit(suffix)) {
switch (to_ascii_lowercase(suffix)) {
case 'k':
multiplier = KiB;
resize = resize.substring_view(0, resize.length() - 1);
break;
case 'm':
multiplier = MiB;
resize = resize.substring_view(0, resize.length() - 1);
break;
case 'g':
multiplier = GiB;
resize = resize.substring_view(0, resize.length() - 1);
break;
default:
args_parser.print_usage(stderr, arguments.strings[0]);
return 1;
}
}
auto size_opt = resize.to_int<off_t>(); auto size_opt = resize.to_int<off_t>();
if (!size_opt.has_value()) { if (!size_opt.has_value() || Checked<off_t>::multiplication_would_overflow(size_opt.value(), multiplier)) {
args_parser.print_usage(stderr, arguments.strings[0]); args_parser.print_usage(stderr, arguments.strings[0]);
return 1; return 1;
} }
size = size_opt.value(); size = size_opt.value() * multiplier;
} }
if (!reference.is_empty()) { if (!reference.is_empty()) {