busybox/coreutils/cat.c

/* vi: set sw=4 ts=4: */
/*
 * Mini Cat implementation for busybox
 *
 * Copyright (C) 1999,2000 by Lineo, inc.
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "internal.h"
#include <stdio.h>

static void print_file(FILE * file)
{
	int c;

	while ((c = getc(file)) != EOF)
		putc(c, stdout);
	fclose(file);
	fflush(stdout);
}

static const char cat_usage[] =
	"cat [FILE]...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nConcatenates FILE(s) and prints them to stdout.\n"
#endif
	;

extern int cat_main(int argc, char **argv)
{
	FILE *file;

	if (argc == 1) {
		print_file(stdin);
		exit(TRUE);
	}

	if (**(argv + 1) == '-')
		usage(cat_usage);

	while (--argc > 0) {
		file = fopen(*++argv, "r");
		if (file == NULL) {
			perror(*argv);
			exit(FALSE);
		}
		print_file(file);
	}
	return(TRUE);
}

/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/