usr.bin/uuencode/uuencode.c

   1 /*      $NetBSD: uuencode.c,v 1.16 2014/09/06 18:58:35 dholland Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)uuencode.c  8.2 (Berkeley) 4/2/94";
  41 #else
  42 __RCSID("$NetBSD: uuencode.c,v 1.16 2014/09/06 18:58:35 dholland Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * uuencode [input] output
  48  *
  49  * Encode a file so it can be mailed to a remote system.
  50  */
  51 #include <sys/types.h>
  52 #include <sys/stat.h>
  53 #include <netinet/in.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <locale.h>
  57 #include <resolv.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 static void encode(void);
  64 static void base64_encode(void);
  65 __dead static void usage(void);
  66
  67 int
  68 main(int argc, char *argv[])
  69 {
  70         struct stat sb;
  71         int base64, ch, mode;
  72
  73         mode = 0;
  74         base64 = 0;
  75         setlocale(LC_ALL, "");
  76         setprogname(argv[0]);
  77
  78         while ((ch = getopt(argc, argv, "m")) != -1) {
  79                 switch(ch) {
  80                 case 'm':
  81                         base64 = 1;
  82                         break;
  83                 default:
  84                         usage();
  85                 }
  86         }
  87         argv += optind;
  88         argc -= optind;
  89
  90         switch(argc) {
  91         case 2:                 /* optional first argument is input file */
  92                 if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb))
  93                         err(1, "%s", *argv);
  94 #define RWX     (S_IRWXU|S_IRWXG|S_IRWXO)
  95                 mode = sb.st_mode & RWX;
  96                 ++argv;
  97                 break;
  98         case 1:
  99 #define RW      (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
 100                 mode = RW & ~umask(RW);
 101                 break;
 102         case 0:
 103         default:
 104                 usage();
 105         }
 106
 107         if (base64) {
 108                 (void)printf("begin-base64 %o %s\n", mode, *argv);
 109                 base64_encode();
 110                 (void)printf("====\n");
 111         } else {
 112                 (void)printf("begin %o %s\n", mode, *argv);
 113                 encode();
 114                 (void)printf("end\n");
 115         }
 116
 117         if (ferror(stdout))
 118                 err(1, "write error");
 119         exit(0);
 120 }
 121
 122 /* ENC is the basic 1 character encoding function to make a char printing */
 123 #define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
 124
 125 /*
 126  * copy from in to out, encoding in base64 as you go along.
 127  */
 128 static void
 129 base64_encode(void)
 130 {
 131         /*
 132          * Output must fit into 80 columns, chunks come in 4, leave 1.
 133          */
 134 #define GROUPS  ((70 / 4) - 1)
 135         unsigned char buf[3];
 136         char buf2[sizeof(buf) * 2 + 1];
 137         size_t n;
 138         int rv, sequence;
 139
 140         sequence = 0;
 141
 142         while ((n = fread(buf, 1, sizeof(buf), stdin))) {
 143                 ++sequence;
 144                 rv = b64_ntop(buf, n, buf2, (sizeof(buf2) / sizeof(buf2[0])));
 145                 if (rv == -1)
 146                         errx(1, "b64_ntop: error encoding base64");
 147                 printf("%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
 148         }
 149         if (sequence % GROUPS)
 150                 printf("\n");
 151 }
 152
 153 /*
 154  * copy from in to out, encoding as you go along.
 155  */
 156 static void
 157 encode(void)
 158 {
 159         int ch, n;
 160         char *p;
 161         char buf[80];
 162
 163         while ((n = fread(buf, 1, 45, stdin)) > 0) {
 164                 ch = ENC(n);
 165                 if (putchar(ch) == EOF)
 166                         break;
 167                 for (p = buf; n > 0; n -= 3, p += 3) {
 168                         ch = *p >> 2;
 169                         ch = ENC(ch);
 170                         if (putchar(ch) == EOF)
 171                                 break;
 172                         ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
 173                         ch = ENC(ch);
 174                         if (putchar(ch) == EOF)
 175                                 break;
 176                         ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
 177                         ch = ENC(ch);
 178                         if (putchar(ch) == EOF)
 179                                 break;
 180                         ch = p[2] & 077;
 181                         ch = ENC(ch);
 182                         if (putchar(ch) == EOF)
 183                                 break;
 184                 }
 185                 if (putchar('\n') == EOF)
 186                         break;
 187         }
 188         if (ferror(stdin))
 189                 err(1, "read error.");
 190         ch = ENC('\0');
 191         (void)putchar(ch);
 192         (void)putchar('\n');
 193 }
 194
 195 static void
 196 usage(void)
 197 {
 198         (void)fprintf(stderr,
 199                       "usage: %s [-m] [inputfile] headername > encodedfile\n",
 200                       getprogname());
 201         exit(1);
 202 }