sys/share/uudecode.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * advertising materials, and other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Berkeley.  The name of the
  11  * University may not be used to endorse or promote products derived
  12  * from this software without specific prior written permission.
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16  */
  17
  18 /*
  19  * Modified 12 April 1990 by Mark Adler for use on MSDOS systems with
  20  * Microsoft C and Turbo C.
  21  *
  22  * Modifed 13 February 1991 by Greg Roelofs for use on VMS systems.  As
  23  * with the MS-DOS version, the setting of the file mode has been disabled.
  24  * Compile and link normally (but note that the shared-image link option
  25  * produces a binary only 6 blocks long, as opposed to the 137-block one
  26  * produced by an ordinary link).  To set up the VMS symbol to run the
  27  * program ("run uudecode filename" won't work), do:
  28  *              uudecode :== "$disk:[directory]uudecode.exe"
  29  * and don't forget the leading "$" or it still won't work.  The binaries
  30  * produced by this program are in VMS "stream-LF" format; this makes no
  31  * difference to VMS when running decoded executables, nor to VMS unzip,
  32  * but other programs such as zoo or arc may or may not require the file
  33  * to be "BILFed" (or "unBILFed" or whatever).  Also, unlike the other
  34  * flavors, VMS files don't get overwritten (a higher version is created).
  35  *
  36  * Modified 13 April 1991 by Gary Mussar to be forgiving of systems that
  37  * appear to be stripping trailing blanks.
  38  *
  39  * Modified 28 February 2002 for use on WIN32 systems with Microsoft C.
  40  */
  41
  42 #ifndef lint
  43 static char sccsid[] = "@(#)uudecode.c  5.5 (Berkeley) 7/6/88";
  44 #endif /* not lint */
  45
  46 #ifdef __MSDOS__        /* For Turbo C */
  47 #define MSDOS 1
  48 #endif
  49
  50 #ifdef _WIN32
  51 #undef MSDOS
  52 #undef __MSDOS__
  53 #ifndef WIN32
  54 #define WIN32
  55 #endif
  56 #endif
  57
  58 /*
  59  * uudecode [input]
  60  *
  61  * create the specified file, decoding as you go.
  62  * used with uuencode.
  63  */
  64 #include <stdio.h>
  65
  66 #ifdef VMS
  67 #  include <types.h>
  68 #  include <stat.h>
  69 #else
  70 #  if !defined(MSDOS) && !defined(WIN32)
  71 #    include <pwd.h>
  72 #  endif
  73 #  include <sys/types.h>   /* MSDOS, WIN32, or UNIX */
  74 #  include <sys/stat.h>
  75 #  include <string.h>
  76 #  include <stdlib.h>
  77 #endif
  78
  79 static void decode(FILE *, FILE *);
  80 static void outdec(char *, FILE *, int);
  81
  82 /* single-character decode */
  83 #define DEC(c)  (((c) - ' ') & 077)
  84
  85 int main(argc, argv)
  86 int argc;
  87 char **argv;
  88 {
  89         FILE *in, *out;
  90         int mode;
  91         char dest[128];
  92         char buf[80];
  93
  94         /* optional input arg */
  95         if (argc > 1) {
  96                 if ((in = fopen(argv[1], "r")) == NULL) {
  97                         perror(argv[1]);
  98                         exit(1);
  99                 }
 100                 argv++; argc--;
 101         } else
 102                 in = stdin;
 103
 104         if (argc != 1) {
 105                 printf("Usage: uudecode [infile]\n");
 106                 exit(2);
 107         }
 108
 109         /* search for header line */
 110         for (;;) {
 111                 if (fgets(buf, sizeof buf, in) == NULL) {
 112                         fprintf(stderr,"%s", "No begin line\n");
 113                         exit(3);
 114                 }
 115                 if (strncmp(buf, "begin ", 6) == 0)
 116                         break;
 117         }
 118         (void)sscanf(buf, "begin %o %s", &mode, dest);
 119
 120 #if !defined(MSDOS) && !defined(VMS) && !defined(WIN32)
 121         /* handle ~user/file format */
 122         if (dest[0] == '~') {
 123                 char *sl;
 124                 struct passwd *getpwnam();
 125                 struct passwd *user;
 126                 char dnbuf[100], *index(), *strcat(), *strcpy();
 127
 128                 sl = index(dest, '/');
 129                 if (sl == NULL) {
 130                         fprintf(stderr,"%s", "Illegal ~user\n");
 131                         exit(3);
 132                 }
 133                 *sl++ = 0;
 134                 user = getpwnam(dest+1);
 135                 if (user == NULL) {
 136                         fprintf(stderr, "No such user as %s\n", dest);
 137                         exit(4);
 138                 }
 139                 strcpy(dnbuf, user->pw_dir);
 140                 strcat(dnbuf, "/");
 141                 strcat(dnbuf, sl);
 142                 strcpy(dest, dnbuf);
 143         }
 144 #endif  /* !defined(MSDOS) && !defined(VMS) */
 145
 146         /* create output file */
 147 #if defined(MSDOS) || defined(WIN32)
 148         out = fopen(dest, "wb");        /* Binary file */
 149 #else
 150         out = fopen(dest, "w");
 151 #endif
 152         if (out == NULL) {
 153                 perror(dest);
 154                 exit(4);
 155         }
 156 #if !defined(MSDOS) && !defined(VMS) && !defined(WIN32) /* i.e., UNIX */
 157         chmod(dest, mode);
 158 #endif
 159
 160         decode(in, out);
 161
 162         if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) {
 163                 fprintf(stderr,"%s", "No end line\n");
 164                 exit(5);
 165         }
 166         exit(0);
 167 }
 168
 169 /*
 170  * copy from in to out, decoding as you go along.
 171  */
 172 void
 173 decode(in, out)
 174 FILE *in;
 175 FILE *out;
 176 {
 177         char buf[80];
 178         char *bp;
 179         int n, i, expected;
 180
 181         for (;;) {
 182                 /* for each input line */
 183                 if (fgets(buf, sizeof buf, in) == NULL) {
 184                         printf("Short file\n");
 185                         exit(10);
 186                 }
 187                 n = DEC(buf[0]);
 188                 if ((n <= 0) || (buf[0] == '\n'))
 189                         break;
 190
 191                 /* Calculate expected # of chars and pad if necessary */
 192                 expected = ((n+2)/3)<<2;
 193                 for (i = strlen(buf)-1; i <= expected; i++) buf[i] = ' ';
 194
 195                 bp = &buf[1];
 196                 while (n > 0) {
 197                         outdec(bp, out, n);
 198                         bp += 4;
 199                         n -= 3;
 200                 }
 201         }
 202 }
 203
 204 /*
 205  * output a group of 3 bytes (4 input characters).
 206  * the input chars are pointed to by p, they are to
 207  * be output to file f.  n is used to tell us not to
 208  * output all of them at the end of the file.
 209  */
 210 void
 211 outdec(p, f, n)
 212 char *p;
 213 FILE *f;
 214 int n;
 215 {
 216         int c1, c2, c3;
 217
 218         c1 = DEC(*p) << 2 | DEC(p[1]) >> 4;
 219         c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
 220         c3 = DEC(p[2]) << 6 | DEC(p[3]);
 221         if (n >= 1)
 222                 putc(c1, f);
 223         if (n >= 2)
 224                 putc(c2, f);
 225         if (n >= 3)
 226                 putc(c3, f);
 227 }
 228
 229 #if !defined(MSDOS) && !defined(VMS) && !defined(WIN32)
 230 /*
 231  * Return the ptr in sp at which the character c appears;
 232  * NULL if not found
 233  */
 234
 235 #ifndef NULL
 236 #define NULL    0
 237 #endif
 238
 239 char *
 240 index(sp, c)
 241 register char *sp, c;
 242 {
 243         do {
 244                 if (*sp == c)
 245                         return(sp);
 246         } while (*sp++);
 247         return(NULL);
 248 }
 249 #endif
 250