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/*
* Copyright (c) 2020, Matthew L. Curry <matthew.curry@gmail.com>
* All rights reserved.
*
* 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 <AK/RefPtr.h>
#include <LibCore/ArgsParser.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct linebuf {
char* buf = NULL;
size_t len = 0;
};
static FILE* get_stream(const char* filepath, const char* perms)
{
FILE* ret;
if (filepath == nullptr) {
if (perms[0] == 'r')
return stdin;
return stdout;
}
ret = fopen(filepath, perms);
if (ret == nullptr) {
perror("fopen");
exit(1);
}
return ret;
}
int main(int argc, char** argv)
{
if (pledge("stdio rpath wpath cpath", nullptr) > 0) {
perror("pledge");
return 1;
}
const char* inpath = nullptr;
const char* outpath = nullptr;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(inpath, "Input file", "input", Core::ArgsParser::Required::No);
args_parser.add_positional_argument(outpath, "Output file", "output", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
FILE* infile = get_stream(inpath, "r");
FILE* outfile = get_stream(outpath, "w");
struct linebuf buffers[2];
struct linebuf* previous = &(buffers[0]);
struct linebuf* current = &(buffers[1]);
bool first_run = true;
for (;;) {
errno = 0;
ssize_t rc = getline(&(current->buf), &(current->len), infile);
if (rc < 0 && errno != 0) {
perror("getline");
exit(1);
}
if (rc < 0)
break;
if (!first_run && strcmp(current->buf, previous->buf) == 0)
continue;
fputs(current->buf, outfile);
swap(current, previous);
first_run = false;
}
fclose(infile);
fclose(outfile);
return 0;
}
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