[BusyBox] rev and tac

[Matt Kraai]

Howdy,

I've coded up rev and tac for busybox.  Should I commit them, or is this
yet another instance of "feature creep?"  Copies of rev.c and tac.c are
included for your enjoyment.

Matt
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/* vi: set sw=4 ts=4: */
/*
 * Mini rev implementation for busybox
 *
 * Copyright (C) 1999,2000 by Lineo, inc.
 * Written by Matt Kraai <kraai at alumni.carnegiemellon.edu>
 *
 * 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
rev_file(FILE *file)
{
	char *line, *s;
	while ((line = get_line_from_file(file)) != NULL) {
		s = line + strlen(line) - 1;

		if (line <= s && *s == '\n')
			s--;
		while (line <= s) {
			fputc(*s, stdout);
			s--;
		}
		fputc('\n', stdout);
		free(line);
	}
}

int
rev_main(int argc, char **argv)
{
	int status = 0;
	FILE *file;

	if (argc == 1) {
		rev_file(stdin);
	} else {
		while (*++argv) {
			if ((file = fopen(*argv, "r")) != NULL) {
				rev_file(file);
				fclose(file);
			} else {
				errorMsg("%s: %s\n", *argv, strerror(errno));
				status = 1;
			}
		}
	}

	return status;
}

/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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/* vi: set sw=4 ts=4: */
/*
 * Mini tac implementation for busybox
 *
 * Copyright (C) 1999,2000 by Lineo, inc.
 * Written by Matt Kraai <kraai at alumni.carnegiemellon.edu>
 *
 * 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
tac_file(FILE *file)
{
	char *line;

	if ((line = get_line_from_file(file)) != NULL) {
		tac_file(file);
		fputs(line, stdout);
		free(line);
	}
}

int
tac_main(int argc, char **argv)
{
	int status = 0;
	FILE *file;

	if (argc == 1) {
		tac_file(stdin);
	} else {
		while (*++argv) {
			if ((file = fopen(*argv, "r")) != NULL) {
				tac_file(file);
				fclose(file);
			} else {
				errorMsg("%s: %s\n", *argv, strerror(errno));
				status = 1;
			}
		}
	}

	return status;
}

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