stdio/vfscanf.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1990, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Chris Torek.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <ctype.h>
  65 #if __STDC__
  66 #include <stdarg.h>
  67 #else
  68 #include <varargs.h>
  69 #endif
  70 #include "local.h"
  71
  72 #define FLOATING_POINT
  73
  74 #include "floatio.h"
  75 #define BUF             513     /* Maximum length of numeric string. */
  76
  77 /*
  78  * Flags used during conversion.
  79  */
  80 #define LONG            0x01    /* l: long or double */
  81 #define LONGDBL         0x02    /* L: long double; unimplemented */
  82 #define SHORT           0x04    /* h: short */
  83 #define SUPPRESS        0x08    /* suppress assignment */
  84 #define POINTER         0x10    /* weird %p pointer (`fake hex') */
  85 #define NOSKIP          0x20    /* do not skip blanks */
  86 #define QUAD            0x400
  87
  88 /*
  89  * The following are used in numeric conversions only:
  90  * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
  91  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
  92  */
  93 #define SIGNOK          0x40    /* +/- is (still) legal */
  94 #define NDIGITS         0x80    /* no digits detected */
  95
  96 #define DPTOK           0x100   /* (float) decimal point is still legal */
  97 #define EXPOK           0x200   /* (float) exponent (e+3, etc) still legal */
  98
  99 #define PFXOK           0x100   /* 0x prefix is (still) legal */
 100 #define NZDIGITS        0x200   /* no zero digits detected */
 101
 102 /*
 103  * Conversion types.
 104  */
 105 #define CT_CHAR         0       /* %c conversion */
 106 #define CT_CCL          1       /* %[...] conversion */
 107 #define CT_STRING       2       /* %s conversion */
 108 #define CT_INT          3       /* integer, i.e., strtoq or strtouq */
 109 #define CT_FLOAT        4       /* floating, i.e., strtod */
 110
 111 #define u_char unsigned char
 112 #define u_long unsigned long
 113
 114 static u_char *__sccl(char *, u_char *);
 115
 116 /*
 117  * vfscanf
 118  */
 119 int
 120 __svfscanf(fp, fmt0, ap)
 121         register FILE *fp;
 122         char const *fmt0;
 123         va_list ap;
 124 {
 125         register u_char *fmt = (u_char *)fmt0;
 126         register int c;         /* character from format, or conversion */
 127         register size_t width;  /* field width, or 0 */
 128         register char *p;       /* points into all kinds of strings */
 129         register int n;         /* handy integer */
 130         register int flags;     /* flags as defined above */
 131         register char *p0;      /* saves original value of p when necessary */
 132         int nassigned;          /* number of fields assigned */
 133         int nread;              /* number of characters consumed from fp */
 134         int base;               /* base argument to strtoq/strtouq */
 135         u_quad_t (*ccfn)();     /* conversion function (strtoq/strtouq) */
 136         char ccltab[256];       /* character class table for %[...] */
 137         char buf[BUF];          /* buffer for numeric conversions */
 138
 139         /* `basefix' is used to avoid `if' tests in the integer scanner */
 140         static short basefix[17] =
 141                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 142
 143         nassigned = 0;
 144         nread = 0;
 145         base = 0;               /* XXX just to keep gcc happy */
 146         ccfn = NULL;            /* XXX just to keep gcc happy */
 147         for (;;) {
 148                 c = *fmt++;
 149                 if (c == 0)
 150                         return (nassigned);
 151                 if (isspace(c)) {
 152                         for (;;) {
 153                                 if (fp->_r <= 0 && __srefill(fp))
 154                                         return (nassigned);
 155                                 if (!isspace(*fp->_p))
 156                                         break;
 157                                 nread++, fp->_r--, fp->_p++;
 158                         }
 159                         continue;
 160                 }
 161                 if (c != '%')
 162                         goto literal;
 163                 width = 0;
 164                 flags = 0;
 165                 /*
 166                  * switch on the format.  continue if done;
 167                  * break once format type is derived.
 168                  */
 169 again:          c = *fmt++;
 170                 switch (c) {
 171                 case '%':
 172 literal:
 173                         if (fp->_r <= 0 && __srefill(fp))
 174                                 goto input_failure;
 175                         if (*fp->_p != c)
 176                                 goto match_failure;
 177                         fp->_r--, fp->_p++;
 178                         nread++;
 179                         continue;
 180
 181                 case '*':
 182                         flags |= SUPPRESS;
 183                         goto again;
 184                 case 'l':
 185                         if( flags & LONG )
 186                                 flags |=  QUAD;
 187                         else
 188                                 flags |= LONG;
 189                         goto again;
 190                 case 'q':
 191                         flags |= QUAD;
 192                         goto again;
 193                 case 'z':
 194                         if( sizeof(size_t) == sizeof(long) )
 195                                 flags |= LONG;
 196                         if( sizeof(size_t) == sizeof(quad_t) )
 197                                 flags |= QUAD;
 198                         goto again;
 199                 case 'L':
 200                         flags |= LONGDBL;
 201                         goto again;
 202                 case 'h':
 203                         flags |= SHORT;
 204                         goto again;
 205
 206                 case '0': case '1': case '2': case '3': case '4':
 207                 case '5': case '6': case '7': case '8': case '9':
 208                         width = width * 10 + c - '0';
 209                         goto again;
 210
 211                 /*
 212                  * Conversions.
 213                  * Those marked `compat' are for 4.[123]BSD compatibility.
 214                  *
 215                  * (According to ANSI, E and X formats are supposed
 216                  * to the same as e and x.  Sorry about that.)
 217                  */
 218                 case 'D':       /* compat */
 219                         flags |= LONG;
 220                         /* FALLTHROUGH */
 221                 case 'd':
 222                         c = CT_INT;
 223                         ccfn = (u_quad_t (*)())strtoq;
 224                         base = 10;
 225                         break;
 226
 227                 case 'i':
 228                         c = CT_INT;
 229                         ccfn = (u_quad_t (*)())strtoq;
 230                         base = 0;
 231                         break;
 232
 233                 case 'O':       /* compat */
 234                         flags |= LONG;
 235                         /* FALLTHROUGH */
 236                 case 'o':
 237                         c = CT_INT;
 238                         ccfn = strtouq;
 239                         base = 8;
 240                         break;
 241
 242                 case 'u':
 243                         c = CT_INT;
 244                         ccfn = strtouq;
 245                         base = 10;
 246                         break;
 247
 248                 case 'X':       /* compat   XXX */
 249                         flags |= LONG;
 250                         /* FALLTHROUGH */
 251                 case 'x':
 252                         flags |= PFXOK; /* enable 0x prefixing */
 253                         c = CT_INT;
 254                         ccfn = strtouq;
 255                         base = 16;
 256                         break;
 257
 258 #ifdef FLOATING_POINT
 259                 case 'E':       /* compat   XXX */
 260                 case 'F':       /* compat */
 261                         flags |= LONG;
 262                         /* FALLTHROUGH */
 263                 case 'e': case 'f': case 'g':
 264                         c = CT_FLOAT;
 265                         break;
 266 #endif
 267
 268                 case 's':
 269                         c = CT_STRING;
 270                         break;
 271
 272                 case '[':
 273                         fmt = __sccl(ccltab, fmt);
 274                         flags |= NOSKIP;
 275                         c = CT_CCL;
 276                         break;
 277
 278                 case 'c':
 279                         flags |= NOSKIP;
 280                         c = CT_CHAR;
 281                         break;
 282
 283                 case 'p':       /* pointer format is like hex */
 284                         flags |= POINTER | PFXOK;
 285                         c = CT_INT;
 286                         ccfn = strtouq;
 287                         base = 16;
 288                         break;
 289
 290                 case 'n':
 291                         if (flags & SUPPRESS)   /* ??? */
 292                                 continue;
 293                         if (flags & SHORT)
 294                                 *va_arg(ap, short *) = nread;
 295                         else if (flags & LONG)
 296                                 *va_arg(ap, long *) = nread;
 297                         else if (flags & QUAD)
 298                                 *va_arg(ap, quad_t *) = nread;
 299                         else
 300                                 *va_arg(ap, int *) = nread;
 301                         continue;
 302
 303                 /*
 304                  * Disgusting backwards compatibility hacks.    XXX
 305                  */
 306                 case '\0':      /* compat */
 307                         return (EOF);
 308
 309                 default:        /* compat */
 310                         if (isupper(c))
 311                                 flags |= LONG;
 312                         c = CT_INT;
 313                         ccfn = (u_quad_t (*)())strtoq;
 314                         base = 10;
 315                         break;
 316                 }
 317
 318                 /*
 319                  * We have a conversion that requires input.
 320                  */
 321                 if (fp->_r <= 0 && __srefill(fp))
 322                         goto input_failure;
 323
 324                 /*
 325                  * Consume leading white space, except for formats
 326                  * that suppress this.
 327                  */
 328                 if ((flags & NOSKIP) == 0) {
 329                         while (isspace(*fp->_p)) {
 330                                 nread++;
 331                                 if (--fp->_r > 0)
 332                                         fp->_p++;
 333                                 else if (__srefill(fp))
 334                                         goto input_failure;
 335                         }
 336                         /*
 337                          * Note that there is at least one character in
 338                          * the buffer, so conversions that do not set NOSKIP
 339                          * ca no longer result in an input failure.
 340                          */
 341                 }
 342
 343                 /*
 344                  * Do the conversion.
 345                  */
 346                 switch (c) {
 347
 348                 case CT_CHAR:
 349                         /* scan arbitrary characters (sets NOSKIP) */
 350                         if (width == 0)
 351                                 width = 1;
 352                         if (flags & SUPPRESS) {
 353                                 size_t sum = 0;
 354                                 for (;;) {
 355                                         if ((n = fp->_r) < width) {
 356                                                 sum += n;
 357                                                 width -= n;
 358                                                 fp->_p += n;
 359                                                 if (__srefill(fp)) {
 360                                                         if (sum == 0)
 361                                                             goto input_failure;
 362                                                         break;
 363                                                 }
 364                                         } else {
 365                                                 sum += width;
 366                                                 fp->_r -= width;
 367                                                 fp->_p += width;
 368                                                 break;
 369                                         }
 370                                 }
 371                                 nread += sum;
 372                         } else {
 373                                 size_t r = fread((void *)va_arg(ap, char *), 1,
 374                                     width, fp);
 375
 376                                 if (r == 0)
 377                                         goto input_failure;
 378                                 nread += r;
 379                                 nassigned++;
 380                         }
 381                         break;
 382
 383                 case CT_CCL:
 384                         /* scan a (nonempty) character class (sets NOSKIP) */
 385                         if (width == 0)
 386                                 width = ~0;     /* `infinity' */
 387                         /* take only those things in the class */
 388                         if (flags & SUPPRESS) {
 389                                 n = 0;
 390                                 while (ccltab[*fp->_p]) {
 391                                         n++, fp->_r--, fp->_p++;
 392                                         if (--width == 0)
 393                                                 break;
 394                                         if (fp->_r <= 0 && __srefill(fp)) {
 395                                                 if (n == 0)
 396                                                         goto input_failure;
 397                                                 break;
 398                                         }
 399                                 }
 400                                 if (n == 0)
 401                                         goto match_failure;
 402                         } else {
 403                                 p0 = p = va_arg(ap, char *);
 404                                 while (ccltab[*fp->_p]) {
 405                                         fp->_r--;
 406                                         *p++ = *fp->_p++;
 407                                         if (--width == 0)
 408                                                 break;
 409                                         if (fp->_r <= 0 && __srefill(fp)) {
 410                                                 if (p == p0)
 411                                                         goto input_failure;
 412                                                 break;
 413                                         }
 414                                 }
 415                                 n = p - p0;
 416                                 if (n == 0)
 417                                         goto match_failure;
 418                                 *p = 0;
 419                                 nassigned++;
 420                         }
 421                         nread += n;
 422                         break;
 423
 424                 case CT_STRING:
 425                         /* like CCL, but zero-length string OK, & no NOSKIP */
 426                         if (width == 0)
 427                                 width = ~0;
 428                         if (flags & SUPPRESS) {
 429                                 n = 0;
 430                                 while (!isspace(*fp->_p)) {
 431                                         n++, fp->_r--, fp->_p++;
 432                                         if (--width == 0)
 433                                                 break;
 434                                         if (fp->_r <= 0 && __srefill(fp))
 435                                                 break;
 436                                 }
 437                                 nread += n;
 438                         } else {
 439                                 p0 = p = va_arg(ap, char *);
 440                                 while (!isspace(*fp->_p)) {
 441                                         fp->_r--;
 442                                         *p++ = *fp->_p++;
 443                                         if (--width == 0)
 444                                                 break;
 445                                         if (fp->_r <= 0 && __srefill(fp))
 446                                                 break;
 447                                 }
 448                                 *p = 0;
 449                                 nread += p - p0;
 450                                 nassigned++;
 451                         }
 452                         continue;
 453
 454                 case CT_INT:
 455                         /* scan an integer as if by strtoq/strtouq */
 456 #ifdef hardway
 457                         if (width == 0 || width > sizeof(buf) - 1)
 458                                 width = sizeof(buf) - 1;
 459 #else
 460                         /* size_t is unsigned, hence this optimisation */
 461                         if (--width > sizeof(buf) - 2)
 462                                 width = sizeof(buf) - 2;
 463                         width++;
 464 #endif
 465                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 466                         for (p = buf; width; width--) {
 467                                 c = *fp->_p;
 468                                 /*
 469                                  * Switch on the character; `goto ok'
 470                                  * if we accept it as a part of number.
 471                                  */
 472                                 switch (c) {
 473
 474                                 /*
 475                                  * The digit 0 is always legal, but is
 476                                  * special.  For %i conversions, if no
 477                                  * digits (zero or nonzero) have been
 478                                  * scanned (only signs), we will have
 479                                  * base==0.  In that case, we should set
 480                                  * it to 8 and enable 0x prefixing.
 481                                  * Also, if we have not scanned zero digits
 482                                  * before this, do not turn off prefixing
 483                                  * (someone else will turn it off if we
 484                                  * have scanned any nonzero digits).
 485                                  */
 486                                 case '0':
 487                                         if (base == 0) {
 488                                                 base = 8;
 489                                                 flags |= PFXOK;
 490                                         }
 491                                         if (flags & NZDIGITS)
 492                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 493                                         else
 494                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 495                                         goto ok;
 496
 497                                 /* 1 through 7 always legal */
 498                                 case '1': case '2': case '3':
 499                                 case '4': case '5': case '6': case '7':
 500                                         base = basefix[base];
 501                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 502                                         goto ok;
 503
 504                                 /* digits 8 and 9 ok iff decimal or hex */
 505                                 case '8': case '9':
 506                                         base = basefix[base];
 507                                         if (base <= 8)
 508                                                 break;  /* not legal here */
 509                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 510                                         goto ok;
 511
 512                                 /* letters ok iff hex */
 513                                 case 'A': case 'B': case 'C':
 514                                 case 'D': case 'E': case 'F':
 515                                 case 'a': case 'b': case 'c':
 516                                 case 'd': case 'e': case 'f':
 517                                         /* no need to fix base here */
 518                                         if (base <= 10)
 519                                                 break;  /* not legal here */
 520                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 521                                         goto ok;
 522
 523                                 /* sign ok only as first character */
 524                                 case '+': case '-':
 525                                         if (flags & SIGNOK) {
 526                                                 flags &= ~SIGNOK;
 527                                                 goto ok;
 528                                         }
 529                                         break;
 530
 531                                 /* x ok iff flag still set & 2nd char */
 532                                 case 'x': case 'X':
 533                                         if (flags & PFXOK && p == buf + 1) {
 534                                                 base = 16;      /* if %i */
 535                                                 flags &= ~PFXOK;
 536                                                 goto ok;
 537                                         }
 538                                         break;
 539                                 }
 540
 541                                 /*
 542                                  * If we got here, c is not a legal character
 543                                  * for a number.  Stop accumulating digits.
 544                                  */
 545                                 break;
 546                 ok:
 547                                 /*
 548                                  * c is legal: store it and look at the next.
 549                                  */
 550                                 *p++ = c;
 551                                 if (--fp->_r > 0)
 552                                         fp->_p++;
 553                                 else if (__srefill(fp))
 554                                         break;          /* EOF */
 555                         }
 556                         /*
 557                          * If we had only a sign, it is no good; push
 558                          * back the sign.  If the number ends in `x',
 559                          * it was [sign] '0' 'x', so push back the x
 560                          * and treat it as [sign] '0'.
 561                          */
 562                         if (flags & NDIGITS) {
 563                                 if (p > buf)
 564                                         (void) ungetc(*(u_char *)--p, fp);
 565                                 goto match_failure;
 566                         }
 567                         c = ((u_char *)p)[-1];
 568                         if (c == 'x' || c == 'X') {
 569                                 --p;
 570                                 (void) ungetc(c, fp);
 571                         }
 572                         if ((flags & SUPPRESS) == 0) {
 573                                 u_quad_t res;
 574
 575                                 *p = 0;
 576                                 res = (*ccfn)(buf, (char **)NULL, base);
 577                                 if (flags & POINTER)
 578                                         *va_arg(ap, void **) = (void *)res;
 579                                 else if (flags & SHORT)
 580                                         *va_arg(ap, short *) = res;
 581                                 else if (flags & QUAD)
 582                                         *va_arg(ap, quad_t *) = res;
 583                                 else if (flags & LONG)
 584                                         *va_arg(ap, long *) = res;
 585                                 else
 586                                         *va_arg(ap, int *) = res;
 587                                 nassigned++;
 588                         }
 589                         nread += p - buf;
 590                         break;
 591
 592 #ifdef FLOATING_POINT
 593                 case CT_FLOAT:
 594                         /* scan a floating point number as if by strtod */
 595 #ifdef hardway
 596                         if (width == 0 || width > sizeof(buf) - 1)
 597                                 width = sizeof(buf) - 1;
 598 #else
 599                         /* size_t is unsigned, hence this optimisation */
 600                         if (--width > sizeof(buf) - 2)
 601                                 width = sizeof(buf) - 2;
 602                         width++;
 603 #endif
 604                         flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
 605                         for (p = buf; width; width--) {
 606                                 c = *fp->_p;
 607                                 /*
 608                                  * This code mimicks the integer conversion
 609                                  * code, but is much simpler.
 610                                  */
 611                                 switch (c) {
 612
 613                                 case '0': case '1': case '2': case '3':
 614                                 case '4': case '5': case '6': case '7':
 615                                 case '8': case '9':
 616                                         flags &= ~(SIGNOK | NDIGITS);
 617                                         goto fok;
 618
 619                                 case '+': case '-':
 620                                         if (flags & SIGNOK) {
 621                                                 flags &= ~SIGNOK;
 622                                                 goto fok;
 623                                         }
 624                                         break;
 625                                 case '.':
 626                                         if (flags & DPTOK) {
 627                                                 flags &= ~(SIGNOK | DPTOK);
 628                                                 goto fok;
 629                                         }
 630                                         break;
 631                                 case 'e': case 'E':
 632                                         /* no exponent without some digits */
 633                                         if ((flags&(NDIGITS|EXPOK)) == EXPOK) {
 634                                                 flags =
 635                                                     (flags & ~(EXPOK|DPTOK)) |
 636                                                     SIGNOK | NDIGITS;
 637                                                 goto fok;
 638                                         }
 639                                         break;
 640                                 }
 641                                 break;
 642                 fok:
 643                                 *p++ = c;
 644                                 if (--fp->_r > 0)
 645                                         fp->_p++;
 646                                 else if (__srefill(fp))
 647                                         break;  /* EOF */
 648                         }
 649                         /*
 650                          * If no digits, might be missing exponent digits
 651                          * (just give back the exponent) or might be missing
 652                          * regular digits, but had sign and/or decimal point.
 653                          */
 654                         if (flags & NDIGITS) {
 655                                 if (flags & EXPOK) {
 656                                         /* no digits at all */
 657                                         while (p > buf)
 658                                                 ungetc(*(u_char *)--p, fp);
 659                                         goto match_failure;
 660                                 }
 661                                 /* just a bad exponent (e and maybe sign) */
 662                                 c = *(u_char *)--p;
 663                                 if (c != 'e' && c != 'E') {
 664                                         (void) ungetc(c, fp);/* sign */
 665                                         c = *(u_char *)--p;
 666                                 }
 667                                 (void) ungetc(c, fp);
 668                         }
 669                         if ((flags & SUPPRESS) == 0) {
 670                                 long double res;
 671
 672                                 *p = 0;
 673                                 res = strtod(buf,(char **) NULL);
 674                                 if (flags & LONGDBL)
 675                                         *va_arg(ap, long double *) = res;
 676                                 else if (flags & LONG)
 677                                         *va_arg(ap, double *) = res;
 678                                 else
 679                                         *va_arg(ap, float *) = res;
 680                                 nassigned++;
 681                         }
 682                         nread += p - buf;
 683                         break;
 684 #endif /* FLOATING_POINT */
 685                 }
 686         }
 687 input_failure:
 688         return (nassigned ? nassigned : -1);
 689 match_failure:
 690         return (nassigned);
 691 }
 692
 693 /*
 694  * Fill in the given table from the scanset at the given format
 695  * (just after `[').  Return a pointer to the character past the
 696  * closing `]'.  The table has a 1 wherever characters should be
 697  * considered part of the scanset.
 698  */
 699 static u_char *
 700 __sccl(tab, fmt)
 701         register char *tab;
 702         register u_char *fmt;
 703 {
 704         register int c, n, v;
 705
 706         /* first `clear' the whole table */
 707         c = *fmt++;             /* first char hat => negated scanset */
 708         if (c == '^') {
 709                 v = 1;          /* default => accept */
 710                 c = *fmt++;     /* get new first char */
 711         } else
 712                 v = 0;          /* default => reject */
 713         /* should probably use memset here */
 714         for (n = 0; n < 256; n++)
 715                 tab[n] = v;
 716         if (c == 0)
 717                 return (fmt - 1);/* format ended before closing ] */
 718
 719         /*
 720          * Now set the entries corresponding to the actual scanset
 721          * to the opposite of the above.
 722          *
 723          * The first character may be ']' (or '-') without being special;
 724          * the last character may be '-'.
 725          */
 726         v = 1 - v;
 727         for (;;) {
 728                 tab[c] = v;             /* take character c */
 729 doswitch:
 730                 n = *fmt++;             /* and examine the next */
 731                 switch (n) {
 732
 733                 case 0:                 /* format ended too soon */
 734                         return (fmt - 1);
 735
 736                 case '-':
 737                         /*
 738                          * A scanset of the form
 739                          *      [01+-]
 740                          * is defined as `the digit 0, the digit 1,
 741                          * the character +, the character -', but
 742                          * the effect of a scanset such as
 743                          *      [a-zA-Z0-9]
 744                          * is implementation defined.  The V7 Unix
 745                          * scanf treats `a-z' as `the letters a through
 746                          * z', but treats `a-a' as `the letter a, the
 747                          * character -, and the letter a'.
 748                          *
 749                          * For compatibility, the `-' is not considerd
 750                          * to define a range if the character following
 751                          * it is either a close bracket (required by ANSI)
 752                          * or is not numerically greater than the character
 753                          * we just stored in the table (c).
 754                          */
 755                         n = *fmt;
 756                         if (n == ']' || n < c) {
 757                                 c = '-';
 758                                 break;  /* resume the for(;;) */
 759                         }
 760                         fmt++;
 761                         do {            /* fill in the range */
 762                                 tab[++c] = v;
 763                         } while (c < n);
 764 #if 1   /* XXX another disgusting compatibility hack */
 765                         /*
 766                          * Alas, the V7 Unix scanf also treats formats
 767                          * such as [a-c-e] as `the letters a through e'.
 768                          * This too is permitted by the standard....
 769                          */
 770                         goto doswitch;
 771 #else
 772                         c = *fmt++;
 773                         if (c == 0)
 774                                 return (fmt - 1);
 775                         if (c == ']')
 776                                 return (fmt);
 777 #endif
 778                         break;
 779
 780                 case ']':               /* end of scanset */
 781                         return (fmt);
 782
 783                 default:                /* just another character */
 784                         c = n;
 785                         break;
 786                 }
 787         }
 788         /* NOTREACHED */
 789 }