minix/commands/uud/uud.c

   1 /* uud - bulletproof version of uudecode */
   2
   3 /*
   4  * Uud -- decode a uuencoded file back to binary form.
   5  *
   6  * From the Berkeley original, modified by MSD, RDR, JPHD & WLS.
   7  * The Atari GEMDOS version compiled with MWC 2.x.
   8  * The MSDOS version with TurboC.
   9  * The Unix version with cc.
  10  * this version is made: 25 Nov 1988.
  11  * Jan 2 1990: Change system definition and change MSDOS to open the output
  12  *             file for write binary do cr/lf replacement.
  13  */
  14
  15 #define UNIX  1         /* define one of: UNIX (Minix too!), MSDOS, or GEMDOS */
  16
  17 #ifdef GEMDOS
  18 #define SYSNAME "gemdos"
  19 #define SMALL 1
  20 #endif
  21 #ifdef MSDOS
  22 #define SYSNAME "msdos"
  23 #define SMALL 1
  24 #endif
  25 #ifdef UNIX
  26 #define SYSNAME "unix"
  27 #endif
  28
  29 #include <sys/types.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <sys/stat.h>
  35 #include <stdio.h>
  36
  37 #ifdef GEMDOS
  38 #include <osbind.h>
  39 #define Error(n)  { Bconin(2); exit(n); }
  40 #else
  41 #define Error(n)  exit(n)
  42 #endif
  43 #ifdef UNIX
  44 #define WRITE     "w"
  45 #else
  46 #define WRITE     "wb"          /* for both MSDOS and GEMDOS!   */
  47 #endif
  48
  49 #define loop    while (1)
  50
  51 #define NCHARS  256
  52 #define LINELEN 256
  53 #define FILELEN 64
  54 #define NORMLEN 60      /* allows for 80 encoded chars per line */
  55
  56 #define SEQMAX 'z'
  57 #define SEQMIN 'a'
  58 char seqc;
  59 int first, secnd, check, numl;
  60
  61 FILE *in, *out;
  62 char *pos;
  63 char ifname[FILELEN], ofname[FILELEN];
  64 char *source = NULL, *target = NULL;
  65 char blank, part = '\0';
  66 int partn, lens;
  67 int debug = 0, nochk = 0, onedone = 0;
  68 int chtbl[NCHARS], cdlen[NORMLEN + 3];
  69
  70 int main(int argc, char **argv);
  71 char *getnword(char *str, int n);
  72 void gettable(void);
  73 void decode(void);
  74 void getfile(char *buf);
  75 void format(char *fp, ...);
  76 void doprnt(char *fp, char *ap);
  77 void puti(unsigned int i, unsigned int r);
  78 void outc(int c);
  79
  80 int main(argc, argv) int argc; char *argv[];
  81 {
  82         int mode;
  83         register int i, j;
  84         char *curarg;
  85         char dest[FILELEN], buf[LINELEN];
  86
  87         while ((curarg = argv[1]) != NULL && curarg[0] == '-') {
  88                 if (((curarg[1] == 'd') || (curarg[1] == 'D')) &&
  89                     (curarg[2] == '\0')) {
  90                         debug = 1;
  91                 } else if (((curarg[1] == 'n') || (curarg[1] == 'N')) &&
  92                            (curarg[2] == '\0')) {
  93                         nochk = 1;
  94                 } else if (((curarg[1] == 't') || (curarg[1] == 'T')) &&
  95                            (curarg[2] == '\0')) {
  96                         argv++;
  97                         argc--;
  98                         if (argc < 2) {
  99                                 format("uud: Missing target directory.\n");
 100                                 Error(15);
 101                         }
 102                         target = argv[1];
 103                         if (debug)
 104                                 format("Target dir = %s\n",target);
 105                 } else if (((curarg[1] == 's') || (curarg[1] == 'S')) &&
 106                            (curarg[2] == '\0')) {
 107                         argv++;
 108                         argc--;
 109                         if (argc < 2) {
 110                                 format("uud: Missing source directory.\n");
 111                                 Error(15);
 112                         }
 113                         source = argv[1];
 114                         if (debug)
 115                                 format("Source dir = %s\n",source);
 116                 } else if (curarg[1] != '\0') {
 117                         format("Usage: uud [-n] [-d] [-s dir] [-t dir] [input-file]\n");
 118                         Error(1);
 119                 } else
 120                         break;
 121                 argv++;
 122                 argc--;
 123         }
 124
 125         if (curarg == NULL || ((curarg[0] == '-') && (curarg[1] == '\0'))) {
 126                 in = stdin;
 127                 strcpy(ifname, "<stdin>");
 128         } else {
 129                 if (source != NULL) {
 130                         strcpy(ifname, source);
 131                         strcat(ifname, curarg);
 132                 } else
 133                         strcpy(ifname, curarg);
 134                 if ((in = fopen(ifname, "r")) == NULL) {
 135                         format("uud: Can't open %s\n", ifname);
 136                         Error(2);
 137                 }
 138                 numl = 0;
 139         }
 140
 141 /*
 142  * Set up the default translation table.
 143  */
 144         for (i = 0; i < ' '; i++) chtbl[i] = -1;
 145         for (i = ' ', j = 0; i < ' ' + 64; i++, j++) chtbl[i] = j;
 146         for (i = ' ' + 64; i < NCHARS; i++) chtbl[i] = -1;
 147         chtbl['`'] = chtbl[' '];        /* common mutation */
 148         chtbl['~'] = chtbl['^'];        /* an other common mutation */
 149         blank = ' ';
 150 /*
 151  * set up the line length table, to avoid computing lotsa * and / ...
 152  */
 153         cdlen[0] = 1;
 154         for (i = 1, j = 5; i <= NORMLEN; i += 3, j += 4)
 155                 cdlen[i] = (cdlen[i + 1] = (cdlen[i + 2] = j));
 156 /*
 157  * search for header or translation table line.
 158  */
 159         loop {  /* master loop for multiple decodes in one file */
 160                 partn = 'a';
 161                 loop {
 162                         if (fgets(buf, sizeof buf, in) == NULL) {
 163                                 if (onedone) {
 164                                         if (debug) format("End of file.\n");
 165                                         exit(0);
 166                                 } else {
 167                                         format("uud: No begin line.\n");
 168                                         Error(3);
 169                                 }
 170                         }
 171                         numl++;
 172                         if (strncmp(buf, "table", (size_t)5) == 0) {
 173                                 gettable();
 174                                 continue;
 175                         }
 176                         if (strncmp(buf, "begin", (size_t)5) == 0) {
 177                                 break;
 178                         }
 179                 }
 180                 lens = strlen(buf);
 181                 if (lens) buf[--lens] = '\0';
 182 #ifdef SMALL
 183                 if ((pos = getnword(buf, 3))) {
 184                         strcpy(dest, pos);
 185                 } else
 186 #else
 187                 if(sscanf(buf,"begin%o%s", &mode, dest) != 2)
 188 #endif
 189                 {
 190                         format("uud: Missing filename in begin line.\n");
 191                         Error(10);
 192                 }
 193
 194                 if (target != NULL) {
 195                         strcpy(ofname, target);
 196                         strcat(ofname, dest);
 197                 } else
 198                         strcpy(ofname, dest);
 199
 200                 if((out = fopen(ofname, WRITE)) == NULL) {
 201                         format("uud: Cannot open output file: %s\n", ofname);
 202                         Error(4);
 203                 }
 204                 if (debug) format("Begin uudecoding: %s\n", ofname);
 205                 seqc = SEQMAX;
 206                 check = nochk ? 0 : 1;
 207                 first = 1;
 208                 secnd = 0;
 209                 decode();
 210                 fclose(out);
 211 #ifdef UNIX
 212                 chmod(ofname, mode);
 213 #endif
 214                 onedone = 1;
 215                 if (debug) format("End uudecoding: %s\n", ofname);
 216         }       /* master loop for multiple decodes in one file */
 217 }
 218
 219 /*
 220  * Bring back a pointer to the start of the nth word.
 221  */
 222 char *getnword(str, n) register char *str; register int n;
 223 {
 224         while((*str == '\t') || (*str == ' ')) str++;
 225         if (! *str) return NULL;
 226         while(--n) {
 227                 while ((*str != '\t') && (*str != ' ') && (*str)) str++;
 228                 if (! *str) return NULL;
 229                 while((*str == '\t') || (*str == ' ')) str++;
 230                 if (! *str) return NULL;
 231         }
 232         return str;
 233 }
 234
 235 /*
 236  * Install the table in memory for later use.
 237  */
 238 void gettable()
 239 {
 240         char buf[LINELEN];
 241         register int c, n = 0;
 242         register char *cpt;
 243
 244         for (c = 0; c < NCHARS; c++) chtbl[c] = -1;
 245
 246 again:  if (fgets(buf, sizeof buf, in) == NULL) {
 247                 format("uud: EOF while in translation table.\n");
 248                 Error(5);
 249         }
 250         numl++;
 251         if (strncmp(buf, "begin", (size_t)5) == 0) {
 252                 format("uud: Incomplete translation table.\n");
 253                 Error(6);
 254         }
 255         cpt = buf + strlen(buf) - 1;
 256         *cpt = ' ';
 257         while (*(cpt) == ' ') {
 258                 *cpt = 0;
 259                 cpt--;
 260         }
 261         cpt = buf;
 262         while ((c = *cpt)) {
 263                 if (chtbl[c] != -1) {
 264                         format("uud: Duplicate char in translation table.\n");
 265                         Error(7);
 266                 }
 267                 if (n == 0) blank = c;
 268                 chtbl[c] = n++;
 269                 if (n >= 64) return;
 270                 cpt++;
 271         }
 272         goto again;
 273 }
 274
 275 /*
 276  * copy from in to out, decoding as you go along.
 277  */
 278
 279 void decode()
 280 {
 281         char buf[LINELEN], outl[LINELEN];
 282         register char *bp, *ut;
 283         register int *trtbl = chtbl;
 284         register int n, c, rlen;
 285         register unsigned int len;
 286
 287         loop {
 288                 if (fgets(buf, sizeof buf, in) == NULL) {
 289                         format("uud: EOF before end.\n");
 290                         fclose(out);
 291                         Error(8);
 292                 }
 293                 numl++;
 294                 len = strlen(buf);
 295                 if (len) buf[--len] = '\0';
 296 /*
 297  * Is it an unprotected empty line before the end line ?
 298  */
 299                 if (len == 0) continue;
 300 /*
 301  * Get the binary line length.
 302  */
 303                 n = trtbl[(unsigned char)*buf];
 304                 if (n >= 0) goto decod;
 305 /*
 306  * end of uuencoded file ?
 307  */
 308                 if (strncmp(buf, "end", (size_t)3) == 0) return;
 309 /*
 310  * end of current file ? : get next one.
 311  */
 312                 if (strncmp(buf, "include", (size_t)7) == 0) {
 313                         getfile(buf);
 314                         continue;
 315                 }
 316                 format("uud: Bad prefix line %d in file: %s\n",numl, ifname);
 317                 if (debug) format("Bad line =%s\n",buf);
 318                 Error(11);
 319 /*
 320  * Sequence checking ?
 321  */
 322 decod:          rlen = cdlen[n];
 323 /*
 324  * Is it the empty line before the end line ?
 325  */
 326                 if (n == 0) continue;
 327 /*
 328  * Pad with blanks.
 329  */
 330                 for (bp = &buf[c = len];
 331                         c < rlen; c++, bp++) *bp = blank;
 332 /*
 333  * Verify if asked for.
 334  */
 335                 if (debug) {
 336                         for (len = 0, bp = buf; len < rlen; len++) {
 337                                 if (trtbl[(unsigned char)*bp] < 0) {
 338                                         format(
 339         "Non uuencoded char <%c>, line %d in file: %s\n", *bp, numl, ifname);
 340                                         format("Bad line =%s\n",buf);
 341                                         Error(16);
 342                                 }
 343                                 bp++;
 344                         }
 345                 }
 346 /*
 347  * All this just to check for uuencodes that append a 'z' to each line....
 348  */
 349                 if (secnd && check) {
 350                         secnd = 0;
 351                         if (buf[rlen] == SEQMAX) {
 352                                 check = 0;
 353                                 if (debug) format("Sequence check turned off (2).\n");
 354                         } else
 355                                 if (debug) format("Sequence check on (2).\n");
 356                 } else if (first && check) {
 357                         first = 0;
 358                         secnd = 1;
 359                         if (buf[rlen] != SEQMAX) {
 360                                 check = 0;
 361                                 if (debug) format("No sequence check (1).\n");
 362                         } else
 363                                 if (debug) format("Sequence check on (1).\n");
 364                 }
 365 /*
 366  * There we check.
 367  */
 368                 if (check) {
 369                         if (buf[rlen] != seqc) {
 370                                 format("uud: Wrong sequence line %d in %s\n",
 371                                         numl, ifname);
 372                                 if (debug)
 373                                         format(
 374         "Sequence char is <%c> instead of <%c>.\n", buf[rlen], seqc);
 375                                 Error(18);
 376                         }
 377                         seqc--;
 378                         if (seqc < SEQMIN) seqc = SEQMAX;
 379                 }
 380 /*
 381  * output a group of 3 bytes (4 input characters).
 382  * the input chars are pointed to by p, they are to
 383  * be output to file f.n is used to tell us not to
 384  * output all of them at the end of the file.
 385  */
 386                 ut = outl;
 387                 len = n;
 388                 bp = &buf[1];
 389                 while (n > 0) {
 390                         *(ut++) = trtbl[(unsigned char)*bp] << 2 | trtbl[(unsigned char)bp[1]] >> 4;
 391                         n--;
 392                         if (n) {
 393                                 *(ut++) = (trtbl[(unsigned char)bp[1]] << 4) |
 394                                           (trtbl[(unsigned char)bp[2]] >> 2);
 395                                 n--;
 396                         }
 397                         if (n) {
 398                                 *(ut++) = trtbl[(unsigned char)bp[2]] << 6 | trtbl[(unsigned char)bp[3]];
 399                                 n--;
 400                         }
 401                         bp += 4;
 402                 }
 403                 if ((n = fwrite(outl, (size_t)1, (size_t)len, out)) <= 0) {
 404                         format("uud: Error on writing decoded file.\n");
 405                         Error(18);
 406                 }
 407         }
 408 }
 409
 410 /*
 411  * Find the next needed file, if existing, otherwise try further
 412  * on next file.
 413  */
 414 void getfile(buf) register char *buf;
 415 {
 416         if ((pos = getnword(buf, 2)) == NULL) {
 417                 format("uud: Missing include file name.\n");
 418                 Error(17);
 419         } else
 420                 if (source != NULL) {
 421                         strcpy(ifname, source);
 422                         strcat(ifname, pos);
 423                 } else
 424                         strcpy(ifname, pos);
 425 #ifdef GEMDOS
 426         if (Fattrib(ifname, 0, 0) < 0)
 427 #else
 428         if (access(ifname, 04))
 429 #endif
 430         {
 431                 if (debug) {
 432                         format("Cant find: %s\n", ifname);
 433                         format("Continuing to read same file.\n");
 434                 }
 435         }
 436         else {
 437                 if (freopen(ifname, "r", in) == in) {
 438                         numl = 0;
 439                         if (debug)
 440                                 format("Reading next section from: %s\n", ifname);
 441                 } else {
 442                         format("uud: Freopen abort: %s\n", ifname);
 443                         Error(9);
 444                 }
 445         }
 446         loop {
 447                 if (fgets(buf, LINELEN, in) == NULL) {
 448                         format("uud: No begin line after include: %s\n", ifname);
 449                         Error(12);
 450                 }
 451                 numl++;
 452                 if (strncmp(buf, "table", (size_t)5) == 0) {
 453                         gettable();
 454                         continue;
 455                 }
 456                 if (strncmp(buf, "begin", (size_t)5) == 0) break;
 457         }
 458         lens = strlen(buf);
 459         if (lens) buf[--lens] = '\0';
 460 /*
 461  * Check the part suffix.
 462  */
 463         if ((pos = getnword(buf, 3)) == NULL ) {
 464                 format("uud: Missing part name, in included file: %s\n", ifname);
 465                 Error(13);
 466         } else {
 467                 part = *pos;
 468                 partn++;
 469                 if (partn > 'z') partn = 'a';
 470                 if (part != partn) {
 471                         format("uud: Part suffix mismatch: <%c> instead of <%c>.\n",
 472                                 part, partn);
 473                         Error(14);
 474                 }
 475                 if (debug) format("Reading part %c\n", *pos);
 476         }
 477 }
 478
 479 /*
 480  * Printf style formatting. (Borrowed from MicroEmacs by Dave Conroy.)
 481  * A lot smaller than the full fledged printf.
 482  */
 483 #ifdef __STDC__
 484 void format(char *fp, ...)
 485 {
 486   va_list args;
 487
 488   va_start (args, fp);
 489   doprnt(fp, (char *)&args);
 490   va_end(args);
 491 }
 492 #else
 493 /* VARARGS1 */
 494 void format(fp, args) char *fp;
 495 {
 496         doprnt(fp, (char *)&args);
 497 }
 498 #endif
 499
 500 void doprnt(fp, ap)
 501 register char   *fp;
 502 register char   *ap;
 503 {
 504         register int    c, k;
 505         register char   *s;
 506
 507         while ((c = *fp++) != '\0') {
 508                 if (c != '%')
 509                         outc(c);
 510                 else {
 511                         c = *fp++;
 512                         switch (c) {
 513                         case 'd':
 514                                 puti(*(int *)ap, 10);
 515                                 ap += sizeof(int);
 516                                 break;
 517
 518                         case 's':
 519                                 s = *(char **)ap;
 520                                 while ((k = *s++) != '\0')
 521                                         outc(k);
 522                                 ap += sizeof(char *);
 523                                 break;
 524
 525                         case 'c':
 526                                 outc(*(int *)ap);
 527                                 ap += sizeof(int);
 528                                 break;
 529
 530                         default:
 531                                 outc(c);
 532                         }
 533                 }
 534         }
 535 }
 536
 537 /*
 538  * Put integer, in radix "r".
 539  */
 540 void puti(i, r)
 541 register unsigned int   i;
 542 register unsigned int   r;
 543 {
 544         register unsigned int   q, s;
 545
 546         if ((q = i / r) != 0)
 547                 puti(q, r);
 548         s = i % r;
 549         if (s <= 9)
 550                 outc(s + '0');
 551         else
 552                 outc(s - 10 + 'A');
 553 }
 554 void outc(c) register char c;
 555 {
 556 #ifdef GEMDOS
 557         if (c == '\n') Bconout(2, '\r');
 558         Bconout(2, c);
 559 #else
 560         putchar(c);
 561 #endif
 562 }