freebsd/usr.bin/uuencode/uuencode.c

/*-
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)uuencode.c	8.2 (Berkeley) 4/2/94";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

/*
 * uuencode [input] output
 *
 * Encode a file so it can be mailed to a remote system.
 */
#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void encode __P((void));
static void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct stat sb;
	int mode;

	while (getopt(argc, argv, "") != -1)
		usage();
	argv += optind;
	argc -= optind;

	switch(argc) {
	case 2:			/* optional first argument is input file */
		if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb))
			err(1, "%s", *argv);
#define	RWX	(S_IRWXU|S_IRWXG|S_IRWXO)
		mode = sb.st_mode & RWX;
		++argv;
		break;
	case 1:
#define	RW	(S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
		mode = RW & ~umask(RW);
		break;
	case 0:
	default:
		usage();
	}

	(void)printf("begin %o %s\n", mode, *argv);
	encode();
	(void)printf("end\n");
	if (ferror(stdout))
		errx(1, "write error");
	exit(0);
}

/* ENC is the basic 1 character encoding function to make a char printing */
#define	ENC(c) ((c) ? ((c) & 077) + ' ': '`')

/*
 * copy from in to out, encoding as you go along.
 */
void
encode()
{
	register int ch, n;
	register char *p;
	char buf[80];

	while ((n = fread(buf, 1, 45, stdin))) {
		ch = ENC(n);
		if (putchar(ch) == EOF)
			break;
		for (p = buf; n > 0; n -= 3, p += 3) {
			/* Pad with nulls if not a multiple of 3. */
			if (n < 3) {
				p[2] = '\0';
				if (n < 2)
					p[1] = '\0';
			}
			ch = *p >> 2;
			ch = ENC(ch);
			if (putchar(ch) == EOF)
				break;
			ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
			ch = ENC(ch);
			if (putchar(ch) == EOF)
				break;
			ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
			ch = ENC(ch);
			if (putchar(ch) == EOF)
				break;
			ch = p[2] & 077;
			ch = ENC(ch);
			if (putchar(ch) == EOF)
				break;
		}
		if (putchar('\n') == EOF)
			break;
	}
	if (ferror(stdin))
		errx(1, "read error");
	ch = ENC('\0');
	(void)putchar(ch);
	(void)putchar('\n');
}

static void
usage()
{
	(void)fprintf(stderr,"usage: uuencode [infile] remotefile\n");
	exit(1);
}