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![Andreas Kling](/assets/img/avatar_default.png)
Get rid of the weird old signature: - int StringType::to_int(bool& ok) const And replace it with sensible new signature: - Optional<int> StringType::to_int() const
132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCore/ArgsParser.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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int main(int argc, char** argv)
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{
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const char* resize = nullptr;
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const char* reference = nullptr;
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const char* file = nullptr;
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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(argc, argv);
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if (!resize && !reference) {
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args_parser.print_usage(stderr, argv[0]);
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return 1;
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}
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if (resize && reference) {
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args_parser.print_usage(stderr, argv[0]);
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return 1;
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}
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auto op = OP_Set;
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int size = 0;
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if (resize) {
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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();
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if (!size_opt.has_value()) {
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args_parser.print_usage(stderr, 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) {
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struct stat st;
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int rc = stat(reference, &st);
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if (rc < 0) {
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perror("stat");
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return 1;
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}
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size = st.st_size;
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}
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int fd = open(file, O_RDWR | O_CREAT, 0666);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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struct stat st;
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if (fstat(fd, &st) < 0) {
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perror("fstat");
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return 1;
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}
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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 = st.st_size + size;
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break;
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case OP_Shrink:
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size = st.st_size - size;
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break;
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}
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if (ftruncate(fd, size) < 0) {
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perror("ftruncate");
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return 1;
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}
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if (close(fd) < 0) {
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perror("close");
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return 1;
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}
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return 0;
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}
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