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/*
* Copyright (c) 2020, Matthew L. Curry <matthew.curry@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/RefPtr.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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;
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath wpath cpath"));
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(arguments);
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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