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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: uuencode.c,v 1.10 2009/10/27 23:59:46 deraadt Exp $	*/
/*	$FreeBSD: uuencode.c,v 1.18 2004/01/22 07:23:35 grehan Exp $	*/

/*-
 * 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. 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.
 */

/*
 * Encode a file so it can be mailed to a remote system.
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <netinet/in.h>

#include <err.h>
#include <locale.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void encode(void);
void base64_encode(void);
static void usage(void);

FILE *output;
int mode;
char **av;

enum program_mode {
	MODE_ENCODE,
	MODE_B64ENCODE
} pmode;

int
main(int argc, char *argv[])
{
	struct stat sb;
	int base64, ch;
	char *outfile;
	extern char *__progname;
	static const char *optstr[2] = {
		"mo:",
		"o:"
	};

	base64 = 0;
	outfile = NULL;

	pmode = MODE_ENCODE;
	if (strcmp(__progname, "b64encode") == 0) {
		base64 = 1;
		pmode = MODE_B64ENCODE;
	}

	setlocale(LC_ALL, "");
	while ((ch = getopt(argc, argv, optstr[pmode])) != -1) {
		switch (ch) {
		case 'm':
			base64 = 1;
			break;
		case 'o':
			outfile = optarg;
			break;
		case '?':
		default:
			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();
	}

	av = argv;

	if (outfile != NULL) {
		output = fopen(outfile, "w+");
		if (output == NULL)
			err(1, "unable to open %s for output", outfile);
	} else
		output = stdout;
	if (base64)
		base64_encode();
	else
		encode();
	if (ferror(output))
		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 in base64 as you go along.
 */
void
base64_encode(void)
{
	/*
	 * Output must fit into 80 columns, chunks come in 4, leave 1.
	 */
#define	GROUPS	((80 / 4) - 1)
	unsigned char buf[3];
	char buf2[sizeof(buf) * 2 + 1];
	size_t n;
	int rv, sequence;

	sequence = 0;

	fprintf(output, "begin-base64 %o %s\n", mode, *av);
	while ((n = fread(buf, 1, sizeof(buf), stdin))) {
		++sequence;
		rv = b64_ntop(buf, n, buf2, (sizeof(buf2) / sizeof(buf2[0])));
		if (rv == -1)
			errx(1, "b64_ntop: error encoding base64");
		fprintf(output, "%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
	}
	if (sequence % GROUPS)
		fprintf(output, "\n");
	fprintf(output, "====\n");
}

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

	(void)fprintf(output, "begin %o %s\n", mode, *av);
	while ((n = fread(buf, 1, 45, stdin))) {
		ch = ENC(n);
		if (fputc(ch, output) == 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 (fputc(ch, output) == EOF)
				break;
			ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
			ch = ENC(ch);
			if (fputc(ch, output) == EOF)
				break;
			ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
			ch = ENC(ch);
			if (fputc(ch, output) == EOF)
				break;
			ch = p[2] & 077;
			ch = ENC(ch);
			if (fputc(ch, output) == EOF)
				break;
		}
		if (fputc('\n', output) == EOF)
			break;
	}
	if (ferror(stdin))
		errx(1, "read error");
	(void)fprintf(output, "%c\nend\n", ENC('\0'));
}

static void
usage(void)
{
	switch (pmode) {
	case MODE_ENCODE:
		(void)fprintf(stderr,
		    "usage: uuencode [-m] [-o output_file] [file] name\n");
		break;
	case MODE_B64ENCODE:
		(void)fprintf(stderr,
		    "usage: b64encode [-o output_file] [file] name\n");
		break;
	}
	exit(1);
}