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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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "options.h"
#include "print.h"
/* This header file is automatically generated at build time from the Makefile
*/
#include "program_info.h"
#define OPTIONS_DEFAULT_SECTOR_SIZE 512
#define OPTIONS_DEFAULT_BUFFER_SIZE (4 * 1024 * 1024)
static void options_init(options_t *const opts);
static int options_parse_unsigned(const char *const arg, uint32_t *const value);
int
options_parse(int argc, char **argv, options_t *const opts)
{
options_init(opts);
int ch;
char *arg_sector_size = NULL;
char *arg_buffer_size = NULL;
while ((ch = getopt(argc, argv, ":b:hs:")) != -1) {
switch (ch) {
case 'b':
arg_buffer_size = optarg;
break;
case 'h':
opts->help = true;
break;
case 's':
arg_sector_size = optarg;
break;
case ':':
print_error("missing argument for option '-%c'", optopt);
return 1;
default:
print_error("unknown option '-%c'", optopt);
return 1;
}
}
argc -= optind;
argv += optind;
if (opts->help) {
return 0;
} else if (argc < 2) {
print_error("missing arguments");
return 1;
} else if (argc > 3) {
print_error("too many arguments");
return 1;
}
/* Convert numbers in the arguments */
if ((arg_sector_size != NULL) &&
options_parse_unsigned(arg_sector_size, &(opts->sector_size))) {
print_error("incorrect sector size");
return 1;
} else if ((arg_buffer_size != NULL) &&
options_parse_unsigned(arg_buffer_size, &(opts->buffer_size))) {
print_error("incorrect buffer size");
return 1;
} else if (opts->sector_size == 0) {
print_error("sector size cannot be 0");
return 1;
} else if (opts->buffer_size == 0) {
print_error("buffer size cannot be 0");
return 1;
} else if (opts->sector_size > opts->buffer_size) {
print_error("sector size cannot larger than buffer size");
return 1;
} else if ((opts->buffer_size % opts->sector_size) != 0) {
print_error("buffer size is not multiple of sector size");
return 1;
}
/* Pick the file paths */
int last_path_index = argc - 1;
opts->out_file_path = argv[last_path_index--];
opts->ref_file_path = argv[last_path_index--];
if (last_path_index >= 0) {
opts->in_file_path = argv[last_path_index];
}
return 0;
}
void
options_usage(int exit_code)
{
printf("Usage: %s [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE] REFFILE "
"OUTFILE\n",
PROGRAM_NAME_STR);
exit(exit_code);
}
static void
options_init(options_t *const opts)
{
opts->help = false;
opts->sector_size = OPTIONS_DEFAULT_SECTOR_SIZE;
opts->buffer_size = OPTIONS_DEFAULT_BUFFER_SIZE;
opts->in_file_path = NULL;
opts->ref_file_path = NULL;
opts->out_file_path = NULL;
}
static int
options_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;
}
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