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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
* Copyright (C) 2022 Leah Rowe <leah@libreboot.org>
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#define REQ_PRINT_USAGE /* Require print_usage() from common.h */
#define REQ_ERRPRINT /* Require errprint() from common.h */
#define DESCRIPTION "Concatenate a file to standard output. \
If no file is specified or file is '-', read standard input."
#define OPERANDS "[-u] [file] ..."
#include "common.h"
int cat(int flides, int unbuffered);
#ifdef FASESBOX
int cat_main(int argc, char *argv[]) {
#else
int main(int argc, char *argv[]) {
#endif
int file, argument, i = 1, unbuffered, err = 0;
char *argv0 = strdup(argv[0]);
while ((argument = getopt(argc, argv, "u")) != -1) {
if (argument == '?') {
print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION);
return 1;
}
else if (argument == 'u')
unbuffered = 1;
} argc -= optind; argv += optind;
if (argc < 1) {
return errprint(argv0, "-", cat(STDIN_FILENO, unbuffered));
}
for (i = 0; i != argc; i++) {
if (strcmp(argv[i], "-")) file = open(argv[i], O_RDONLY);
else file = STDIN_FILENO;
if (file == -1)
return errprint(argv0, argv[i], errno); /* Something went wrong */
err = errprint(argv0, argv[i], cat(file, unbuffered));
close(file);
}
return err;
}
int cat(int fildes, int unbuffered) {
char s[4096];
FILE *filstr;
size_t length;
if (unbuffered) while ((length = read(fildes, s, 4096)) > 0)
write(STDOUT_FILENO, s, length);
else {
if (fildes != STDIN_FILENO) filstr = fdopen(fildes, "r");
else filstr = stdin;
while ((length = fread(s, 4096, 1, filstr)) > 0)
fwrite(s, length, 1, stdout);
}
if (errno) return errno;
return 0;
}
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