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/* cat - concatenate a file to stdout
* Copyright (C) 2022 Ferass EL HAFIDI
* Copyright (C) 2022 Leah Rowe
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define _POSIX_C_SOURCE 200809L
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "version.h"
#ifndef COMPILETIME
#define COMPILETIME
#endif
int cat(int flides, int unbuffered);
void printUsage();
int main(int argc, char *const argv[]) {
int file, argument, i = 1, unbuffered;
while ((argument = getopt(argc, argv, "u")) != -1) {
if (argument == '?') {
printUsage();
return 1;
}
else if (argument == 'u')
unbuffered = 1;
}
if (argc < 2) {
cat(STDIN_FILENO, unbuffered);
}
for (i = 1; i != argc; i++) {
if (strcmp(argv[i], "-u")) {
if (strcmp(argv[i], "-")) file = open(argv[i], O_RDONLY);
else file = STDIN_FILENO;
if (file == -1) return errno; /* Something went wrong */
cat(file, unbuffered);
close(file);
}
}
return 0;
}
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 {
filstr = fdopen(fildes, "r");
while ((length = fread(s, 4096, 1, filstr)) > 0)
fwrite(s, length, 1, stdout);
}
if (errno) return errno;
return 0;
}
void printUsage() {
printf("Ferass' Base System. (%s)\n\n"
"Usage: cat [file]\n\n"
"Concatenate <file> to standard output.\n"
"When no file is specified or file is '-', read standard input\n\n"
"\t-u\tPrint unbuffered\n", COMPILETIME);
}
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