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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
*/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
/* Requirements in common.h */
#define REQ_PRINT_USAGE
#define REQ_ERRPRINT
#include "../common/common.h"
#define DESCRIPTION "Duplicate standard input."
#define OPERANDS "[-ai] [file...]"
int main(int argc, char *argv[]) {
int argument, length, i = 0, fildes[13], append_or_truncate = O_TRUNC;
int ret = 0; /* Used for write errors. */
char *argv0 = strdup(argv[0]), buffer[4096];
while ((argument = getopt(argc, argv, "ai")) != -1) {
if (argument == '?')
return print_usage(argv0, DESCRIPTION, OPERANDS, VERSION);
else if (argument == 'i') {
struct sigaction signal_action;
signal_action.sa_handler = SIG_IGN;
sigemptyset(&signal_action.sa_mask);
sigaction(SIGINT, &signal_action, NULL);
} else if (argument == 'a')
append_or_truncate = O_APPEND;
} argc -= optind; argv += optind;
/* Open all files */
for (i = 0; i < argc && argc != 0 && i <= 13; i++) { /* TODO: No file limit */
fildes[i] = open(argv[i], O_WRONLY | O_CREAT | append_or_truncate, 0666);
if (errno) return errprint(argv0, argv[i], errno);
}
while ((length = read(STDIN_FILENO, buffer, 4096)) > 0) {
write(STDOUT_FILENO, buffer, length); /* Write to stdout. */
/* ...And to all other files */
for (i = 0; i < argc && argc != 0 && i <= 13; i++) {
write(fildes[i], buffer, length);
if (errno) ret = errprint(argv0, argv[i], length);
}
}
for (i = 0; i < argc && argc != 0 && i <= 13; i++) {
close(fildes[i]);
if (errno) return errprint(argv0, argv[i], errno);
}
return ret;
}
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