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/* Copyright 2019 Ján Sučan <jan@jansucan.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "options.h"
#include <iostream>
#include <cstring>
#include <unistd.h>
/* This header file is automatically generated at build time from the Makefile
*/
#include "program_info.h"
Options::Options()
: sector_size{Options::DEFAULT_SECTOR_SIZE},
buffer_size{Options::DEFAULT_BUFFER_SIZE}
{
}
uint32_t
Options::getSectorSize() const
{
return sector_size;
}
uint32_t
Options::getBufferSize() const
{
return buffer_size;
}
std::filesystem::path
OptionsBackup::getInFilePath() const
{
return in_file_path;
}
std::filesystem::path
OptionsBackup::getBaseFilePath() const
{
return base_file_path;
}
std::filesystem::path
OptionsBackup::getOutFilePath() const
{
return out_file_path;
}
std::filesystem::path
OptionsRestore::getInFilePath() const
{
return in_file_path;
}
std::filesystem::path
OptionsRestore::getOutFilePath() const
{
return out_file_path;
}
void
OptionParser::printUsage()
{
std::cout << "Usage: " << PROGRAM_NAME_STR << " backup [-s SECTOR_SIZE]";
std::cout << " [-b BUFFER_SIZE] INFILE BASEFILE OUTFILE" << std::endl;
std::cout << " Or: " << PROGRAM_NAME_STR << " restore [-s SECTOR_SIZE]";
std::cout << "[-b BUFFER_SIZE] REFFILE OUTFILE" << std::endl;
std::cout << " Or: " << PROGRAM_NAME_STR << " help" << std::endl;
}
bool
OptionParser::isHelp(int argc, char **argv)
{
return isOperation(argc, argv, "help");
}
bool
OptionParser::isBackup(int argc, char **argv)
{
return isOperation(argc, argv, "backup");
}
bool
OptionParser::isRestore(int argc, char **argv)
{
return isOperation(argc, argv, "restore");
}
OptionsBackup
OptionParser::parseBackup(int argc, char **argv)
{
OptionsBackup opts;
parse_common(&argc, &argv, opts);
if (argc < 3) {
throw OptionError("missing arguments");
} else if (argc > 3) {
throw OptionError("too many arguments");
} else {
opts.in_file_path = next_arg(&argv);
opts.base_file_path = next_arg(&argv);
opts.out_file_path = next_arg(&argv);
}
return opts;
}
OptionsRestore
OptionParser::parseRestore(int argc, char **argv)
{
OptionsRestore opts;
parse_common(&argc, &argv, opts);
if (argc < 2) {
throw OptionError("missing arguments");
} else if (argc > 2) {
throw OptionError("too many arguments");
} else {
opts.in_file_path = next_arg(&argv);
opts.out_file_path = next_arg(&argv);
}
return opts;
}
bool
OptionParser::isOperation(int argc, char **argv, std::string_view operationName)
{
return ((argc >= 2) &&
(strncmp(argv[1], operationName.data(),
OptionParser::MAX_OPERATION_NAME_LENGTH) == 0));
}
int
OptionParser::parse_unsigned(const char *const arg, uint32_t *const value)
{
char *end;
errno = 0;
*value = strtoul(arg, &end, 0);
return ((*end != '\0') || (errno != 0)) ? -1 : 0;
}
void
OptionParser::parse_common(int *const argc, char ***const argv, Options &opts)
{
// Skip the executable name. Do not skip the operation name. getopt expects
// to start at an argument immediately preceding the possible options.
*argc -= 1;
*argv += 1;
int ch;
const char *arg_sector_size = NULL;
const char *arg_buffer_size = NULL;
while ((ch = getopt(*argc, *argv, ":b:s:")) != -1) {
switch (ch) {
case 'b':
arg_buffer_size = optarg;
break;
case 's':
arg_sector_size = optarg;
break;
case ':':
throw OptionError("missing argument for option '-" +
std::string(1, optopt) + "'");
default:
throw OptionError("unknown option '-" + std::string(1, optopt) +
"'");
}
}
*argc -= optind;
*argv += optind;
/* Convert numbers in the arguments */
if ((arg_sector_size != NULL) &&
parse_unsigned(arg_sector_size, &(opts.sector_size))) {
throw OptionError("incorrect sector size");
} else if ((arg_buffer_size != NULL) &&
parse_unsigned(arg_buffer_size, &(opts.buffer_size))) {
throw OptionError("incorrect buffer size");
} else if (opts.sector_size == 0) {
throw OptionError("sector size cannot be 0");
} else if (opts.buffer_size == 0) {
throw OptionError("buffer size cannot be 0");
} else if (opts.sector_size > opts.buffer_size) {
throw OptionError("sector size cannot larger than buffer size");
} else if ((opts.buffer_size % opts.sector_size) != 0) {
throw OptionError("buffer size is not multiple of sector size");
}
}
const char *
OptionParser::next_arg(char ***const argv)
{
const char *arg = **argv;
++(*argv);
return arg;
}
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