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/* cat - concatenate a file to stdout
* Copyright (C) 2022 Ferass EL HAFIDI
* Copyright (C) 2022 Leah Rowe
*
* 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.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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.
*/
#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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