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60f6bc902b
StringView was used where possible. Some utilities still use libc functions which expect null-terminated strings, so String objects were used there instead.
94 lines
2.3 KiB
C++
94 lines
2.3 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 <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <unistd.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.argv[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.argv[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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String str = resize;
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switch (str[0]) {
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case '+':
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op = OP_Grow;
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str = str.substring(1, str.length() - 1);
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break;
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case '-':
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op = OP_Shrink;
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str = str.substring(1, str.length() - 1);
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break;
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}
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auto size_opt = str.to_int<off_t>();
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if (!size_opt.has_value()) {
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args_parser.print_usage(stderr, arguments.argv[0]);
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return 1;
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}
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size = size_opt.value();
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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 = stat.st_size - size;
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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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