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https://github.com/SerenityOS/serenity
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ea411774f0
When using the `-s` option to reduce the size of a file, the file size is now set to zero if the argument given would result in a file size less than zero. This matches the behavior of truncate on Linux and FreeBSD.
111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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enum TruncateOperation {
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OP_Set,
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OP_Grow,
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OP_Shrink,
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};
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath wpath cpath"));
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StringView resize;
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StringView reference;
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StringView file;
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Core::ArgsParser args_parser;
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args_parser.add_option(resize, "Resize the target file to (or by) this size. Prefix with + or - to expand or shrink the file, or a bare number to set the size exactly", "size", 's', "size");
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args_parser.add_option(reference, "Resize the target file to match the size of this one", "reference", 'r', "file");
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args_parser.add_positional_argument(file, "File path", "file");
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args_parser.parse(arguments);
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if (resize.is_empty() && reference.is_empty()) {
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args_parser.print_usage(stderr, arguments.strings[0]);
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return 1;
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}
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if (!resize.is_empty() && !reference.is_empty()) {
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args_parser.print_usage(stderr, arguments.strings[0]);
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return 1;
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}
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auto op = OP_Set;
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off_t size = 0;
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if (!resize.is_empty()) {
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switch (resize[0]) {
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case '+':
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op = OP_Grow;
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resize = resize.substring_view(1);
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break;
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case '-':
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op = OP_Shrink;
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resize = resize.substring_view(1);
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break;
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}
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auto suffix = resize[resize.length() - 1];
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i64 multiplier = 1;
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if (!AK::is_ascii_digit(suffix)) {
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switch (to_ascii_lowercase(suffix)) {
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case 'k':
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multiplier = KiB;
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resize = resize.substring_view(0, resize.length() - 1);
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break;
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case 'm':
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multiplier = MiB;
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resize = resize.substring_view(0, resize.length() - 1);
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break;
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case 'g':
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multiplier = GiB;
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resize = resize.substring_view(0, resize.length() - 1);
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break;
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default:
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args_parser.print_usage(stderr, arguments.strings[0]);
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return 1;
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}
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}
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auto size_opt = resize.to_int<off_t>();
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if (!size_opt.has_value() || Checked<off_t>::multiplication_would_overflow(size_opt.value(), multiplier)) {
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args_parser.print_usage(stderr, arguments.strings[0]);
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return 1;
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}
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size = size_opt.value() * multiplier;
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}
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if (!reference.is_empty()) {
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auto stat = TRY(Core::System::stat(reference));
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size = stat.st_size;
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}
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auto fd = TRY(Core::System::open(file, O_RDWR | O_CREAT, 0666));
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auto stat = TRY(Core::System::fstat(fd));
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switch (op) {
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case OP_Set:
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break;
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case OP_Grow:
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size = stat.st_size + size;
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break;
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case OP_Shrink:
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size = max(stat.st_size - size, 0);
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break;
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}
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TRY(Core::System::ftruncate(fd, size));
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TRY(Core::System::close(fd));
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return 0;
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}
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