* Copyright (c) 1983, 1993

/* $NetBSD: uuencode.c,v 1.17 2019/03/04 05:37:08 rin 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)uuencode.c 8.2 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: uuencode.c,v 1.17 2019/03/04 05:37:08 rin Exp $");
#endif
#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 <netinet/in.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

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

int
main(int argc, char *argv[])
{
struct stat sb;
int base64, ch, mode;

mode = 0;
base64 = 0;
setlocale(LC_ALL, "");
setprogname(argv[0]);

while ((ch = getopt(argc, argv, "m")) != -1) {
switch(ch) {
case 'm':
base64 = 1;
break;
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();
}

if (base64) {
(void)printf("begin-base64 %o %s\n", mode, *argv);
base64_encode();
(void)printf("====\n");
} else {
(void)printf("begin %o %s\n", mode, *argv);
encode();
(void)printf("end\n");
}

if (ferror(stdout))
err(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.
*/
static void
base64_encode(void)
{
/*
* Output must fit into 80 columns, chunks come in 4, leave 1.
*/
#define GROUPS ((70 / 4) - 1)
unsigned char buf[3];
char buf2[sizeof(buf) * 2 + 1];
size_t n;
int rv, sequence;

sequence = 0;

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");
printf("%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
}
if (sequence % GROUPS)
printf("\n");
}

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

while ((n = fread(buf, 1, 45, stdin)) > 0) {
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))
err(1, "read error.");
ch = ENC('\0');
(void)putchar(ch);
(void)putchar('\n');
}

static void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-m] [inputfile] headername > encodedfile\n",
getprogname());
exit(1);
}