contrib/sendmail-8.13.4/libsm/vfscanf.c

   1 /*
   2  * Copyright (c) 2000-2001, 2004 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * By using this file, you agree to the terms and conditions set
  11  * forth in the LICENSE file which can be found at the top level of
  12  * the sendmail distribution.
  13  */
  14
  15 #include <sm/gen.h>
  16 SM_IDSTR(id, "@(#)$Id: vfscanf.c,v 1.52 2004/08/03 20:56:32 ca Exp $")
  17
  18 #include <ctype.h>
  19 #include <stdlib.h>
  20 #include <errno.h>
  21 #include <setjmp.h>
  22 #include <sys/time.h>
  23 #include <sm/varargs.h>
  24 #include <sm/config.h>
  25 #include <sm/io.h>
  26 #include <sm/signal.h>
  27 #include <sm/clock.h>
  28 #include <sm/string.h>
  29 #include "local.h"
  30
  31 #define BUF             513     /* Maximum length of numeric string. */
  32
  33 /* Flags used during conversion. */
  34 #define LONG            0x01    /* l: long or double */
  35 #define SHORT           0x04    /* h: short */
  36 #define QUAD            0x08    /* q: quad (same as ll) */
  37 #define SUPPRESS        0x10    /* suppress assignment */
  38 #define POINTER         0x20    /* weird %p pointer (`fake hex') */
  39 #define NOSKIP          0x40    /* do not skip blanks */
  40
  41 /*
  42 **  The following are used in numeric conversions only:
  43 **  SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
  44 **  SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
  45 */
  46
  47 #define SIGNOK          0x080   /* +/- is (still) legal */
  48 #define NDIGITS         0x100   /* no digits detected */
  49
  50 #define DPTOK           0x200   /* (float) decimal point is still legal */
  51 #define EXPOK           0x400   /* (float) exponent (e+3, etc) still legal */
  52
  53 #define PFXOK           0x200   /* 0x prefix is (still) legal */
  54 #define NZDIGITS        0x400   /* no zero digits detected */
  55
  56 /* Conversion types. */
  57 #define CT_CHAR         0       /* %c conversion */
  58 #define CT_CCL          1       /* %[...] conversion */
  59 #define CT_STRING       2       /* %s conversion */
  60 #define CT_INT          3       /* integer, i.e., strtoll or strtoull */
  61 #define CT_FLOAT        4       /* floating, i.e., strtod */
  62
  63 static void             scanalrm __P((int));
  64 static unsigned char    *sm_sccl __P((char *, unsigned char *));
  65 static jmp_buf          ScanTimeOut;
  66
  67 /*
  68 **  SCANALRM -- handler when timeout activated for sm_io_vfscanf()
  69 **
  70 **  Returns flow of control to where setjmp(ScanTimeOut) was set.
  71 **
  72 **      Parameters:
  73 **              sig -- unused
  74 **
  75 **      Returns:
  76 **              does not return
  77 **
  78 **      Side Effects:
  79 **              returns flow of control to setjmp(ScanTimeOut).
  80 **
  81 **      NOTE:   THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
  82 **              ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
  83 **              DOING.
  84 */
  85
  86 /* ARGSUSED0 */
  87 static void
  88 scanalrm(sig)
  89         int sig;
  90 {
  91         longjmp(ScanTimeOut, 1);
  92 }
  93
  94 /*
  95 **  SM_VFSCANF -- convert input into data units
  96 **
  97 **      Parameters:
  98 **              fp -- file pointer for input data
  99 **              timeout -- time intvl allowed to complete (milliseconds)
 100 **              fmt0 -- format for finding data units
 101 **              ap -- vectors for memory location for storing data units
 102 **
 103 **      Results:
 104 **              Success: number of data units assigned
 105 **              Failure: SM_IO_EOF
 106 */
 107
 108 int
 109 sm_vfscanf(fp, timeout, fmt0, ap)
 110         register SM_FILE_T *fp;
 111         int SM_NONVOLATILE timeout;
 112         char const *fmt0;
 113         va_list SM_NONVOLATILE ap;
 114 {
 115         register unsigned char *SM_NONVOLATILE fmt = (unsigned char *) fmt0;
 116         register int c;         /* character from format, or conversion */
 117         register size_t width;  /* field width, or 0 */
 118         register char *p;       /* points into all kinds of strings */
 119         register int n;         /* handy integer */
 120         register int flags;     /* flags as defined above */
 121         register char *p0;      /* saves original value of p when necessary */
 122         int nassigned;          /* number of fields assigned */
 123         int nread;              /* number of characters consumed from fp */
 124         int base;               /* base argument to strtoll/strtoull */
 125         ULONGLONG_T (*ccfn)();  /* conversion function (strtoll/strtoull) */
 126         char ccltab[256];       /* character class table for %[...] */
 127         char buf[BUF];          /* buffer for numeric conversions */
 128         SM_EVENT *evt = NULL;
 129
 130         /* `basefix' is used to avoid `if' tests in the integer scanner */
 131         static short basefix[17] =
 132                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 133
 134         if (timeout == SM_TIME_DEFAULT)
 135                 timeout = fp->f_timeout;
 136         if (timeout == SM_TIME_IMMEDIATE)
 137         {
 138                 /*
 139                 **  Filling the buffer will take time and we are wanted to
 140                 **  return immediately. So...
 141                 */
 142
 143                 errno = EAGAIN;
 144                 return SM_IO_EOF;
 145         }
 146
 147         if (timeout != SM_TIME_FOREVER)
 148         {
 149                 if (setjmp(ScanTimeOut) != 0)
 150                 {
 151                         errno = EAGAIN;
 152                         return SM_IO_EOF;
 153                 }
 154
 155                 evt = sm_seteventm(timeout, scanalrm, 0);
 156         }
 157
 158         nassigned = 0;
 159         nread = 0;
 160         base = 0;               /* XXX just to keep gcc happy */
 161         ccfn = NULL;            /* XXX just to keep gcc happy */
 162         for (;;)
 163         {
 164                 c = *fmt++;
 165                 if (c == 0)
 166                 {
 167                         if (evt != NULL)
 168                                 sm_clrevent(evt); /*  undo our timeout */
 169                         return nassigned;
 170                 }
 171                 if (isspace(c))
 172                 {
 173                         while ((fp->f_r > 0 || sm_refill(fp, SM_TIME_FOREVER)
 174                                                 == 0) &&
 175                             isspace(*fp->f_p))
 176                                 nread++, fp->f_r--, fp->f_p++;
 177                         continue;
 178                 }
 179                 if (c != '%')
 180                         goto literal;
 181                 width = 0;
 182                 flags = 0;
 183
 184                 /*
 185                 **  switch on the format.  continue if done;
 186                 **  break once format type is derived.
 187                 */
 188
 189 again:          c = *fmt++;
 190                 switch (c)
 191                 {
 192                   case '%':
 193 literal:
 194                         if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER))
 195                                 goto input_failure;
 196                         if (*fp->f_p != c)
 197                                 goto match_failure;
 198                         fp->f_r--, fp->f_p++;
 199                         nread++;
 200                         continue;
 201
 202                   case '*':
 203                         flags |= SUPPRESS;
 204                         goto again;
 205                   case 'h':
 206                         flags |= SHORT;
 207                         goto again;
 208                   case 'l':
 209                         if (*fmt == 'l')
 210                         {
 211                                 fmt++;
 212                                 flags |= QUAD;
 213                         }
 214                         else
 215                         {
 216                                 flags |= LONG;
 217                         }
 218                         goto again;
 219                   case 'q':
 220                         flags |= QUAD;
 221                         goto again;
 222
 223                   case '0': case '1': case '2': case '3': case '4':
 224                   case '5': case '6': case '7': case '8': case '9':
 225                         width = width * 10 + c - '0';
 226                         goto again;
 227
 228                 /*
 229                 **  Conversions.
 230                 **  Those marked `compat' are for 4.[123]BSD compatibility.
 231                 **
 232                 **  (According to ANSI, E and X formats are supposed
 233                 **  to the same as e and x.  Sorry about that.)
 234                 */
 235
 236                   case 'D':     /* compat */
 237                         flags |= LONG;
 238                         /* FALLTHROUGH */
 239                   case 'd':
 240                         c = CT_INT;
 241                         ccfn = (ULONGLONG_T (*)())sm_strtoll;
 242                         base = 10;
 243                         break;
 244
 245                   case 'i':
 246                         c = CT_INT;
 247                         ccfn = (ULONGLONG_T (*)())sm_strtoll;
 248                         base = 0;
 249                         break;
 250
 251                   case 'O':     /* compat */
 252                         flags |= LONG;
 253                         /* FALLTHROUGH */
 254                   case 'o':
 255                         c = CT_INT;
 256                         ccfn = sm_strtoull;
 257                         base = 8;
 258                         break;
 259
 260                   case 'u':
 261                         c = CT_INT;
 262                         ccfn = sm_strtoull;
 263                         base = 10;
 264                         break;
 265
 266                   case 'X':
 267                   case 'x':
 268                         flags |= PFXOK; /* enable 0x prefixing */
 269                         c = CT_INT;
 270                         ccfn = sm_strtoull;
 271                         base = 16;
 272                         break;
 273
 274                   case 'E':
 275                   case 'G':
 276                   case 'e':
 277                   case 'f':
 278                   case 'g':
 279                         c = CT_FLOAT;
 280                         break;
 281
 282                   case 's':
 283                         c = CT_STRING;
 284                         break;
 285
 286                   case '[':
 287                         fmt = sm_sccl(ccltab, fmt);
 288                         flags |= NOSKIP;
 289                         c = CT_CCL;
 290                         break;
 291
 292                   case 'c':
 293                         flags |= NOSKIP;
 294                         c = CT_CHAR;
 295                         break;
 296
 297                   case 'p':     /* pointer format is like hex */
 298                         flags |= POINTER | PFXOK;
 299                         c = CT_INT;
 300                         ccfn = sm_strtoull;
 301                         base = 16;
 302                         break;
 303
 304                   case 'n':
 305                         if (flags & SUPPRESS)   /* ??? */
 306                                 continue;
 307                         if (flags & SHORT)
 308                                 *SM_VA_ARG(ap, short *) = nread;
 309                         else if (flags & LONG)
 310                                 *SM_VA_ARG(ap, long *) = nread;
 311                         else
 312                                 *SM_VA_ARG(ap, int *) = nread;
 313                         continue;
 314
 315                 /* Disgusting backwards compatibility hacks.    XXX */
 316                   case '\0':    /* compat */
 317                         if (evt != NULL)
 318                                 sm_clrevent(evt); /*  undo our timeout */
 319                         return SM_IO_EOF;
 320
 321                   default:      /* compat */
 322                         if (isupper(c))
 323                                 flags |= LONG;
 324                         c = CT_INT;
 325                         ccfn = (ULONGLONG_T (*)()) sm_strtoll;
 326                         base = 10;
 327                         break;
 328                 }
 329
 330                 /* We have a conversion that requires input. */
 331                 if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER))
 332                         goto input_failure;
 333
 334                 /*
 335                 **  Consume leading white space, except for formats
 336                 **  that suppress this.
 337                 */
 338
 339                 if ((flags & NOSKIP) == 0)
 340                 {
 341                         while (isspace(*fp->f_p))
 342                         {
 343                                 nread++;
 344                                 if (--fp->f_r > 0)
 345                                         fp->f_p++;
 346                                 else if (sm_refill(fp, SM_TIME_FOREVER))
 347                                         goto input_failure;
 348                         }
 349                         /*
 350                         **  Note that there is at least one character in
 351                         **  the buffer, so conversions that do not set NOSKIP
 352                         **  can no longer result in an input failure.
 353                         */
 354                 }
 355
 356                 /* Do the conversion. */
 357                 switch (c)
 358                 {
 359                   case CT_CHAR:
 360                         /* scan arbitrary characters (sets NOSKIP) */
 361                         if (width == 0)
 362                                 width = 1;
 363                         if (flags & SUPPRESS)
 364                         {
 365                                 size_t sum = 0;
 366                                 for (;;)
 367                                 {
 368                                         if ((size_t) (n = fp->f_r) < width)
 369                                         {
 370                                                 sum += n;
 371                                                 width -= n;
 372                                                 fp->f_p += n;
 373                                                 if (sm_refill(fp,
 374                                                               SM_TIME_FOREVER))
 375                                                 {
 376                                                         if (sum == 0)
 377                                                                 goto input_failure;
 378                                                         break;
 379                                                 }
 380                                         }
 381                                         else
 382                                         {
 383                                                 sum += width;
 384                                                 fp->f_r -= width;
 385                                                 fp->f_p += width;
 386                                                 break;
 387                                         }
 388                                 }
 389                                 nread += sum;
 390                         }
 391                         else
 392                         {
 393                                 size_t r;
 394
 395                                 r = sm_io_read(fp, SM_TIME_FOREVER,
 396                                                 (void *) SM_VA_ARG(ap, char *),
 397                                                 width);
 398                                 if (r == 0)
 399                                         goto input_failure;
 400                                 nread += r;
 401                                 nassigned++;
 402                         }
 403                         break;
 404
 405                   case CT_CCL:
 406                         /* scan a (nonempty) character class (sets NOSKIP) */
 407                         if (width == 0)
 408                                 width = (size_t)~0;     /* `infinity' */
 409
 410                         /* take only those things in the class */
 411                         if (flags & SUPPRESS)
 412                         {
 413                                 n = 0;
 414                                 while (ccltab[*fp->f_p] != '\0')
 415                                 {
 416                                         n++, fp->f_r--, fp->f_p++;
 417                                         if (--width == 0)
 418                                                 break;
 419                                         if (fp->f_r <= 0 &&
 420                                             sm_refill(fp, SM_TIME_FOREVER))
 421                                         {
 422                                                 if (n == 0) /* XXX how? */
 423                                                         goto input_failure;
 424                                                 break;
 425                                         }
 426                                 }
 427                                 if (n == 0)
 428                                         goto match_failure;
 429                         }
 430                         else
 431                         {
 432                                 p0 = p = SM_VA_ARG(ap, char *);
 433                                 while (ccltab[*fp->f_p] != '\0')
 434                                 {
 435                                         fp->f_r--;
 436                                         *p++ = *fp->f_p++;
 437                                         if (--width == 0)
 438                                                 break;
 439                                         if (fp->f_r <= 0 &&
 440                                             sm_refill(fp, SM_TIME_FOREVER))
 441                                         {
 442                                                 if (p == p0)
 443                                                         goto input_failure;
 444                                                 break;
 445                                         }
 446                                 }
 447                                 n = p - p0;
 448                                 if (n == 0)
 449                                         goto match_failure;
 450                                 *p = 0;
 451                                 nassigned++;
 452                         }
 453                         nread += n;
 454                         break;
 455
 456                   case CT_STRING:
 457                         /* like CCL, but zero-length string OK, & no NOSKIP */
 458                         if (width == 0)
 459                                 width = (size_t)~0;
 460                         if (flags & SUPPRESS)
 461                         {
 462                                 n = 0;
 463                                 while (!isspace(*fp->f_p))
 464                                 {
 465                                         n++, fp->f_r--, fp->f_p++;
 466                                         if (--width == 0)
 467                                                 break;
 468                                         if (fp->f_r <= 0 &&
 469                                             sm_refill(fp, SM_TIME_FOREVER))
 470                                                 break;
 471                                 }
 472                                 nread += n;
 473                         }
 474                         else
 475                         {
 476                                 p0 = p = SM_VA_ARG(ap, char *);
 477                                 while (!isspace(*fp->f_p))
 478                                 {
 479                                         fp->f_r--;
 480                                         *p++ = *fp->f_p++;
 481                                         if (--width == 0)
 482                                                 break;
 483                                         if (fp->f_r <= 0 &&
 484                                             sm_refill(fp, SM_TIME_FOREVER))
 485                                                 break;
 486                                 }
 487                                 *p = 0;
 488                                 nread += p - p0;
 489                                 nassigned++;
 490                         }
 491                         continue;
 492
 493                   case CT_INT:
 494                         /* scan an integer as if by strtoll/strtoull */
 495 #if SM_CONF_BROKEN_SIZE_T
 496                         if (width == 0 || width > sizeof(buf) - 1)
 497                                 width = sizeof(buf) - 1;
 498 #else /* SM_CONF_BROKEN_SIZE_T */
 499                         /* size_t is unsigned, hence this optimisation */
 500                         if (--width > sizeof(buf) - 2)
 501                                 width = sizeof(buf) - 2;
 502                         width++;
 503 #endif /* SM_CONF_BROKEN_SIZE_T */
 504                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 505                         for (p = buf; width > 0; width--)
 506                         {
 507                                 c = *fp->f_p;
 508
 509                                 /*
 510                                 **  Switch on the character; `goto ok'
 511                                 **  if we accept it as a part of number.
 512                                 */
 513
 514                                 switch (c)
 515                                 {
 516
 517                                 /*
 518                                 **  The digit 0 is always legal, but is
 519                                 **  special.  For %i conversions, if no
 520                                 **  digits (zero or nonzero) have been
 521                                 **  scanned (only signs), we will have
 522                                 **  base==0.  In that case, we should set
 523                                 **  it to 8 and enable 0x prefixing.
 524                                 **  Also, if we have not scanned zero digits
 525                                 **  before this, do not turn off prefixing
 526                                 **  (someone else will turn it off if we
 527                                 **  have scanned any nonzero digits).
 528                                 */
 529
 530                                   case '0':
 531                                         if (base == 0)
 532                                         {
 533                                                 base = 8;
 534                                                 flags |= PFXOK;
 535                                         }
 536                                         if (flags & NZDIGITS)
 537                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 538                                         else
 539                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 540                                         goto ok;
 541
 542                                 /* 1 through 7 always legal */
 543                                   case '1': case '2': case '3':
 544                                   case '4': case '5': case '6': case '7':
 545                                         base = basefix[base];
 546                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 547                                         goto ok;
 548
 549                                 /* digits 8 and 9 ok iff decimal or hex */
 550                                   case '8': case '9':
 551                                         base = basefix[base];
 552                                         if (base <= 8)
 553                                                 break;  /* not legal here */
 554                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 555                                         goto ok;
 556
 557                                 /* letters ok iff hex */
 558                                   case 'A': case 'B': case 'C':
 559                                   case 'D': case 'E': case 'F':
 560                                   case 'a': case 'b': case 'c':
 561                                   case 'd': case 'e': case 'f':
 562
 563                                         /* no need to fix base here */
 564                                         if (base <= 10)
 565                                                 break;  /* not legal here */
 566                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 567                                         goto ok;
 568
 569                                 /* sign ok only as first character */
 570                                   case '+': case '-':
 571                                         if (flags & SIGNOK)
 572                                         {
 573                                                 flags &= ~SIGNOK;
 574                                                 goto ok;
 575                                         }
 576                                         break;
 577
 578                                 /* x ok iff flag still set & 2nd char */
 579                                   case 'x': case 'X':
 580                                         if (flags & PFXOK && p == buf + 1)
 581                                         {
 582                                                 base = 16;      /* if %i */
 583                                                 flags &= ~PFXOK;
 584                                                 goto ok;
 585                                         }
 586                                         break;
 587                                 }
 588
 589                                 /*
 590                                 **  If we got here, c is not a legal character
 591                                 **  for a number.  Stop accumulating digits.
 592                                 */
 593
 594                                 break;
 595                 ok:
 596                                 /* c is legal: store it and look at the next. */
 597                                 *p++ = c;
 598                                 if (--fp->f_r > 0)
 599                                         fp->f_p++;
 600                                 else if (sm_refill(fp, SM_TIME_FOREVER))
 601                                         break;          /* SM_IO_EOF */
 602                         }
 603
 604                         /*
 605                         **  If we had only a sign, it is no good; push
 606                         **  back the sign.  If the number ends in `x',
 607                         **  it was [sign] '0' 'x', so push back the x
 608                         **  and treat it as [sign] '0'.
 609                         */
 610
 611                         if (flags & NDIGITS)
 612                         {
 613                                 if (p > buf)
 614                                         (void) sm_io_ungetc(fp, SM_TIME_DEFAULT,
 615                                                             *(unsigned char *)--p);
 616                                 goto match_failure;
 617                         }
 618                         c = ((unsigned char *)p)[-1];
 619                         if (c == 'x' || c == 'X')
 620                         {
 621                                 --p;
 622                                 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c);
 623                         }
 624                         if ((flags & SUPPRESS) == 0)
 625                         {
 626                                 ULONGLONG_T res;
 627
 628                                 *p = 0;
 629                                 res = (*ccfn)(buf, (char **)NULL, base);
 630                                 if (flags & POINTER)
 631                                         *SM_VA_ARG(ap, void **) =
 632                                             (void *)(long) res;
 633                                 else if (flags & QUAD)
 634                                         *SM_VA_ARG(ap, LONGLONG_T *) = res;
 635                                 else if (flags & LONG)
 636                                         *SM_VA_ARG(ap, long *) = res;
 637                                 else if (flags & SHORT)
 638                                         *SM_VA_ARG(ap, short *) = res;
 639                                 else
 640                                         *SM_VA_ARG(ap, int *) = res;
 641                                 nassigned++;
 642                         }
 643                         nread += p - buf;
 644                         break;
 645
 646                   case CT_FLOAT:
 647                         /* scan a floating point number as if by strtod */
 648                         if (width == 0 || width > sizeof(buf) - 1)
 649                                 width = sizeof(buf) - 1;
 650                         flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
 651                         for (p = buf; width; width--)
 652                         {
 653                                 c = *fp->f_p;
 654
 655                                 /*
 656                                 **  This code mimicks the integer conversion
 657                                 **  code, but is much simpler.
 658                                 */
 659
 660                                 switch (c)
 661                                 {
 662
 663                                   case '0': case '1': case '2': case '3':
 664                                   case '4': case '5': case '6': case '7':
 665                                   case '8': case '9':
 666                                         flags &= ~(SIGNOK | NDIGITS);
 667                                         goto fok;
 668
 669                                   case '+': case '-':
 670                                         if (flags & SIGNOK)
 671                                         {
 672                                                 flags &= ~SIGNOK;
 673                                                 goto fok;
 674                                         }
 675                                         break;
 676                                   case '.':
 677                                         if (flags & DPTOK)
 678                                         {
 679                                                 flags &= ~(SIGNOK | DPTOK);
 680                                                 goto fok;
 681                                         }
 682                                         break;
 683                                   case 'e': case 'E':
 684
 685                                         /* no exponent without some digits */
 686                                         if ((flags&(NDIGITS|EXPOK)) == EXPOK)
 687                                         {
 688                                                 flags =
 689                                                     (flags & ~(EXPOK|DPTOK)) |
 690                                                     SIGNOK | NDIGITS;
 691                                                 goto fok;
 692                                         }
 693                                         break;
 694                                 }
 695                                 break;
 696                 fok:
 697                                 *p++ = c;
 698                                 if (--fp->f_r > 0)
 699                                         fp->f_p++;
 700                                 else if (sm_refill(fp, SM_TIME_FOREVER))
 701                                         break;  /* SM_IO_EOF */
 702                         }
 703
 704                         /*
 705                         **  If no digits, might be missing exponent digits
 706                         **  (just give back the exponent) or might be missing
 707                         **  regular digits, but had sign and/or decimal point.
 708                         */
 709
 710                         if (flags & NDIGITS)
 711                         {
 712                                 if (flags & EXPOK)
 713                                 {
 714                                         /* no digits at all */
 715                                         while (p > buf)
 716                                                 (void) sm_io_ungetc(fp,
 717                                                              SM_TIME_DEFAULT,
 718                                                              *(unsigned char *)--p);
 719                                         goto match_failure;
 720                                 }
 721
 722                                 /* just a bad exponent (e and maybe sign) */
 723                                 c = *(unsigned char *) --p;
 724                                 if (c != 'e' && c != 'E')
 725                                 {
 726                                         (void) sm_io_ungetc(fp, SM_TIME_DEFAULT,
 727                                                             c); /* sign */
 728                                         c = *(unsigned char *)--p;
 729                                 }
 730                                 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c);
 731                         }
 732                         if ((flags & SUPPRESS) == 0)
 733                         {
 734                                 double res;
 735
 736                                 *p = 0;
 737                                 res = strtod(buf, (char **) NULL);
 738                                 if (flags & LONG)
 739                                         *SM_VA_ARG(ap, double *) = res;
 740                                 else
 741                                         *SM_VA_ARG(ap, float *) = res;
 742                                 nassigned++;
 743                         }
 744                         nread += p - buf;
 745                         break;
 746                 }
 747         }
 748 input_failure:
 749         if (evt != NULL)
 750                 sm_clrevent(evt); /*  undo our timeout */
 751         return nassigned ? nassigned : -1;
 752 match_failure:
 753         if (evt != NULL)
 754                 sm_clrevent(evt); /*  undo our timeout */
 755         return nassigned;
 756 }
 757
 758 /*
 759 **  SM_SCCL -- sequenced character comparison list
 760 **
 761 **  Fill in the given table from the scanset at the given format
 762 **  (just after `[').  Return a pointer to the character past the
 763 **  closing `]'.  The table has a 1 wherever characters should be
 764 **  considered part of the scanset.
 765 **
 766 **      Parameters:
 767 **              tab -- array flagging "active" char's to match (returned)
 768 **              fmt -- character list (within "[]")
 769 **
 770 **      Results:
 771 */
 772
 773 static unsigned char *
 774 sm_sccl(tab, fmt)
 775         register char *tab;
 776         register unsigned char *fmt;
 777 {
 778         register int c, n, v;
 779
 780         /* first `clear' the whole table */
 781         c = *fmt++;             /* first char hat => negated scanset */
 782         if (c == '^')
 783         {
 784                 v = 1;          /* default => accept */
 785                 c = *fmt++;     /* get new first char */
 786         }
 787         else
 788                 v = 0;          /* default => reject */
 789
 790         /* should probably use memset here */
 791         for (n = 0; n < 256; n++)
 792                 tab[n] = v;
 793         if (c == 0)
 794                 return fmt - 1; /* format ended before closing ] */
 795
 796         /*
 797         **  Now set the entries corresponding to the actual scanset
 798         **  to the opposite of the above.
 799         **
 800         **  The first character may be ']' (or '-') without being special;
 801         **  the last character may be '-'.
 802         */
 803
 804         v = 1 - v;
 805         for (;;)
 806         {
 807                 tab[c] = v;             /* take character c */
 808 doswitch:
 809                 n = *fmt++;             /* and examine the next */
 810                 switch (n)
 811                 {
 812
 813                   case 0:                       /* format ended too soon */
 814                         return fmt - 1;
 815
 816                   case '-':
 817                         /*
 818                         **  A scanset of the form
 819                         **      [01+-]
 820                         **  is defined as `the digit 0, the digit 1,
 821                         **  the character +, the character -', but
 822                         **  the effect of a scanset such as
 823                         **      [a-zA-Z0-9]
 824                         **  is implementation defined.  The V7 Unix
 825                         **  scanf treats `a-z' as `the letters a through
 826                         **  z', but treats `a-a' as `the letter a, the
 827                         **  character -, and the letter a'.
 828                         **
 829                         **  For compatibility, the `-' is not considerd
 830                         **  to define a range if the character following
 831                         **  it is either a close bracket (required by ANSI)
 832                         **  or is not numerically greater than the character
 833                         **  we just stored in the table (c).
 834                         */
 835
 836                         n = *fmt;
 837                         if (n == ']' || n < c)
 838                         {
 839                                 c = '-';
 840                                 break;  /* resume the for(;;) */
 841                         }
 842                         fmt++;
 843                         do
 844                         {
 845                                 /* fill in the range */
 846                                 tab[++c] = v;
 847                         } while (c < n);
 848 #if 1   /* XXX another disgusting compatibility hack */
 849
 850                         /*
 851                         **  Alas, the V7 Unix scanf also treats formats
 852                         **  such as [a-c-e] as `the letters a through e'.
 853                         **  This too is permitted by the standard....
 854                         */
 855
 856                         goto doswitch;
 857 #else
 858                         c = *fmt++;
 859                         if (c == 0)
 860                                 return fmt - 1;
 861                         if (c == ']')
 862                                 return fmt;
 863                         break;
 864 #endif
 865
 866                   case ']':             /* end of scanset */
 867                         return fmt;
 868
 869                   default:              /* just another character */
 870                         c = n;
 871                         break;
 872                 }
 873         }
 874         /* NOTREACHED */
 875 }